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tm 11-6625-2866-14&p technical manual operator`s

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1. 50 MHz BANDWID 30 2 Sieben PER DIVISION SCAN WIDTH PER 1 MHz ettet tuta tetti v EE Ea SE on oi Coi 10 dB UNING STABILIZER CAN TIME PER 20 MILLISECONDS 10 dBLOG OG REF LEVEL cuinnean aia anina 10 dBm IDEO 10 kHz SNNT INT CAN TRIGGER AUTO 3 Set Tracking Generator Spectrum Analyzer System FREQUENCY to 50 MHz and SCAN WIDTH to ZERO 4 7 11 6625 2866 14 amp P Model 8444A Performance Tests PERFORMANCE TESTS 4 17 Frequency Stability cont d 4 Connect Tracking Generator AUX RF OUTPUT to Test Analyzer RF INPUT 5 Adjust Test Analyzer FREQUENCY control to center signal on CRT Display 6 Reduce Test Analyzer BANDWIDTH to 1 kHz and SCAN WIDTH PER DIVISION to 2 kHz while keeping signal centered on CHT display 7 Set Test Analyzer INPUT ATTENUATION to 30 dB LOG LINEAR to LINEAR and LINEAR SENSITIVITY to 20 mV DIV 8 Adjust Test Analyzer LINEAR SENSITIVITY Vernier control for a full e
2. naires 3 Set Spectrum Analyzer TUNING STABILIZER to OFF and set SCAN WIDTH to ZERO Adjust FREQUENCY for indication of 30 MHz 100 kHz on Frequency Counter 4 Tune Tracking Generator TRACK ADJ for maximum signal amplitude on Spectrum Analyzer 5 Connect Power Sensor to 435A POWER REF OUTPUT and ZERO Power Meter Set rear panel POWER REF switch to ON up Set CAL ADJ for proper 435A indication Remove Power Sensor and return POWER REF switch to OFF 6 Disconnect cable at Tracking Generator RF OUTPUT and connect Power Sensor to RF OUTPUT connector Disconnect FIRST LO cable and ZERO Power Meter Reconnect FIRST LO cable Measure and record power level MAX ACTUAL MIN 0 5dBm dBm 0 5 dBm 7 Set Tracking Generator LEVEL control fully counterclockwise Measure and record power level MAX ACTUAL MIN 10dBm 12 dBm 8 Adjust Tracking Generator LEVEL control to set a dBm reference level on power meter 9 With Spectrum Analyzer FREQUENCY control slowly tune the Spectrum Analyzer and Tracking Generator between 10 MHz and 1 3 GHz if using 8555A RF Section or between 500 kHz and 1 25 GHz if using 8554 RF Section 10 Note and record the maximum overall power deviation MAX ACTUAL 1 dB 0 5 dB dB TM 11 6625 2866 14 amp P Model 8444A Performance Tests PERFORMANCE TESTS This space intentionally left blank 4 17 Frequency Stability SPECIFICATION Stability Residual F
3. OFF SIGNAL IDENTIFIER OFF 300 kHz SGAN WIDTH PER DIVISION SCAN WIDTH PER 10 MHz INPUT ATTENUAT ION iiiter hehehe nee 20 dB BASELINE GLIPPER 9 o clock SCAN TIME PER 0 5 SECONDS LOG LINEAR E 10 dBLOG LOG REF LEVEL Vernier e bete erbe te heres tee b er 0 VIDEO FILTER M OFF SGAN MODE reete i ERR INT SCAN TRIGGER LINE 8555A RF Section only 3 Disconnect the cable between Tracking Generator RF OUTPUT and Spectrum Analyzer INPUT 4 Connect cable between Tracking Generator RF OUTPUT and the INPUT of the Test Analyzer 5 Observe the Test Analyzer display for harmonic and spurious signals A typical display is shown in Figure 4 7 The Tracking Generator fundamental signal is shown between the 2 and 1 graticule lines The second harmonic is shown between the 1 and 2 lines with the third harmonic shown between the 4 and 5 lines The amplitude of the second harmonic is approximately 36 dB below the fundamental The third harmonic is down approximately 50 dB A spurious signal with an amplitude of approximately 58 dBm is shown between the 4 and 3 graticule lines 6 Change the Tracking Generator Spectr
4. UG 201A U PROCEDURE 1 Perform preset adjustment procedures paragraph 4 7 for 8554 8552 141 Spectrum Analyzer System for 8555A 8552 141T Spectrum Analyzer System 2 Connect test setup as indicated in Figure 4 6 make the following control settings Tracking Generator Spectrum Analyzer System paragraph 4 7 off 4 9 Spectrum Analyzer 8553B 8552B 141T Test Analyzer EREQUEN GY trm erm der 50 MHz BANDWIDTH S e eei teen ves e 300 kHz SCAN E PER DIVISION SCAN WIDTH PER DIVISION 2 0 MHz INPUT ATTENUATION me eee arua toes 20 dB BASE IURE UNE de d ends 10 o clock VIDEO zii OFF SCAN TIME PER 2 MILLISECONDS EOG UINEAR am 10 dB LOG TM 11 6625 2866 14 amp P Model 8444A Performance Tests PERFORMANCE TESTS 4 20 Harmonic Distortion cont d COGIRE F ee Te 0 dBm LOG REF LEVEL V ie eR ERE ERE ERES 0 SCAN MODE oiim INT SGAN TRIGGER s REPRE LINE Tracking Generator Spectrum Analyzer System Tracking Generator E M M Max signal level zz 0 dBm Spectrum Analyzer BAND anainn n 1 2 05 GHz IF 50 MHz TUNING STABILIZER
5. UG 201A U PROCEDURE 1 Perform Power Supply Check and Adjustment 2 Perform 1 55 GHz Oscillator Power Level Frequency Check and Adjustment paragraph 5 9 3 Apply power to Spectrum Analyzer System Frequency Comb Generator and Tracking Generator Allow at least one 1 hour for equipment stabilization 4 Disconnect Cable W4 at Mixer Assy and Cable W8 at First Converter A5J2 see Figures 8 4 and 8 12 Connect 11592 60003 cable between W8 and J1 5 Disconnect Cable W9 from 2 and connect 11592 60001 cable between J2 and Frequency Comb Generator 6 Disconnect Cable W10 from A6 J3 and connect 11592 60001 cable between A6 J3 and Spectrum Analyzer RF input 7 Set instrument controls as follows 5 6 11 6625 2866 14 amp Model 8444A Adjustments ADJUSTMENTS 5 10 1 55 GHz Oscillator Residual FM Check cont d Tracking Generator EINE XOEE ONZ ON ha ree bee eie bie bees eie haa ree Centered Frequency Comb Generator COMB FREQUENCY MHZ 220020 0 000000 100 MHz OUTPUT AMPLITUDE 000 000 00000000000000 nnne nnn Maximum CW Spectrum Analyzer RS RANGE 0 110 FREQUENCY 50 MHz BANDWIDTE E E DI ce 30 kHz SCAN WIDI ee e e ceu PER DIVISION SCAN WIDTH PER 1 MHz
6. nnm 20 dB TUNING STABILIZER On BASE LINE CLIPPER CCW SCAN TIME PER DIVISION 10 MILLISECONDS LOG LINEAR 10 dB LOG HOG REFLEVEL trate meters OdBm LOG REF LEVEL Vernier 2 0 VIDEO FILTER Emm OFF SCAN MODE INT SCAN TRIGGER LINE or AUTO j Set Tracking Generator controls as follows MANUALSCAN LEVEL k Adjust TRACK ADJ control for maximum amplitude of trace on CRT display trace is not within 0 5 dB of LOG REF level graticule line repeat Spectrum Analyzer calibration procedure m Reconnect Tracking Generator RF OUTPUT to Spectrum Analyzer RF INPUT and adjust TRACK ADJ for maximum signal amplitude n Rotate LEVEL control fully counterclockwise 10 dBm and note signal level on CRT display 10 to 12 dBm Model 8444A If the signal level is off more than 0 5 dB at the 0 dBm point or not within 10 to 12 dBm with the I L VEL control fully counterclockwise refer to paragraph 4 16 Output Level Performance Check a 1 13 for LEVEL control calibration procedure 4 9 Preset Adjustments 8555A 8552B 141T 8444A System 4 10 Procedure a Apply power to Tracking Generator and Spectrum Analyzer b Turn Spectrum Analyzer INTENSITY control fully CCW c Allow instruments to warm up for at least 30 minutes d Per form Spectrum Ana
7. 11 6625 2866 14 amp TECHNICAL MANUAL OPERATOR S ORGANIZATIONAL DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE MANUAL INCLUDING REPAIR PARTS AND SPECIAL TOOLS LISTS FOR GENERATOR TRACKING SG 1125 U HEWLETT PACKARD MODEL 84444 NSN 6625 00 185 4802 HEADQUARTERS DEPARTMENT OF THE ARMY 29 FEBRUARY 1980 11 6625 2866 14 amp P 1 HEADQUARTERS DEPARTMENT OF THE ARMY No 1 WASHINGTON DC 28 August 1980 Operator s Organizational Direct Support and General Support Maintenance Manual Including Repair Parts and Special Tools Lists For GENERATOR TRACKING SG 1125 U HEWLETT PACKARD MODEL 84444 NSN 6625 00 185 4802 TM 11 6625 2866 14 amp P 29 February 1980 is changed as follows 1 Remove old pages and insert new pages as indicated below Insert i 6 9lthrougH 6 11 6 12 blank F 1 through F 3 F 4 blank ee and 6 2 H 3 througiff H 5 H 6 blank 2 File this sheet in front of the manual for reference purposes By Order of the Secretary the Army Official J C PENNINGTON Major General United States Army The Adjutant General Distribution Active Army HISA Ft Monmouth 21 USAINSCOM 2 COE 1 TSG 1 USAARENBD 1 DARCOM 1 2 OS Maj Comd 4 TECOM 2 USACC 4 MDW 1 Armies 2 Corps 2 Svc Colleges 1 USASIGS 5 USAADS 2 USAFAS 2 USAARMS 2
8. 1 4 1 29 Recommended Test Equipment 1 4 ADJUSTMENTS 5 2 2 0 5 1 OL INSTALLATION 2 1 Equipment Required 5 1 Initial Inspection 2 1 5 6 Factory Selected Components Mechanical 2 1 Power Supply Check and Adjustment 5 1 Electrical 2 1 5 9 1 55 GHz Oscillator Power Level Claims for Damage 2 1 Frequency Check amp Adjustment 5 4 Preparation for Use 2 1 5 10 1 55 GHz Oscillator Residual Power Requirements 2 1 FM Check 5 6 Power 2 1 First Converter Check and Operating Environment 2 1 Adjustment sese 5 9 Installation Connections 2 2 Automatic Level Control ALC Storage and Shipment 2 2 Check and Adjustment 5 11 2 22 Original Packaging Level Control Calibration Check 2 26 Other Packaging Materials 2 2 and Adjustment 5 13 VL REPLACEABLE 6 1 _ OPERATION dpt tati d 3 1 Introduction 6 1 Introduction s 3 1 Abbreviations 6 1 3
9. Model 8444A Adjustments ADJUSTMENTS VIDEO FILTIER cM 10 kHz SCAN TRIGGER n AUTO 3 Disconnect W6 cable at RF OUT of 500 MHz Amplifier Assembly A4 4 Connect 11592 60001 cable between A4 RF OUT and Spectrum Analyzer INPUT using UG 201A U adapter 5 Record 500 MHz signal level 0 6 Disconnect 11592 60001 cable from A4 RF OUT connector 7 Install W6 cable removed in step 3 above 8 Disconnect W9 cable at A5 J3 and connect 11592 60001 cable between A5 J3 and Spectrum Analyzer INPUT 9 ES Spectrum Analyzer 1 550 MHz IF BAND and adjust FREQUENCY control for dial indication of 2050 2 10 Set Spectrum Analyzer LOG LINEAR switch to LINEAR and adjust LINEAR SENSITIVITY controls to position signal peak between the 5 and 7 LIN graticule lines 11 Adjust A5 ADJ 1 1 55 GHz oscillator cavity for peak signal indication on CRT display 12 Alternately adjust A5 ADJ 2 and ADJ 3 2 05 GHz IF bandpass cavities for peak signal indication on CRT display 13 Repeat steps 11 and 12 above 14 Set Spectrum Analyzer SCAN PER DIVISION to 1 MHz 15 Tune Tracking Generator TRACK ADJ through its tuning range while observing the CRT display 16 The passband should be similar to that displayed in Figure 5 6 If not set TRACK ADJ to center of passband and repeat steps 11 through 15 17 Set Spectrum Analyzer LOG LINEAR switch to LOG measure and record first con
10. Soldapult by Edsyn Co Arleta California Freon Aceton Lacquer Thinner Isopropyl Alcohol 100 dry Krylon No 1302 Humiseal Protective Coating Type 1B12 by Columbia Technical Corporation Woodside 77 New York Model 8444A cathode relationship in a vacuum tube The base emitter junction is essentially a solid state diode for the transistor to conduct this diode must be forward biased As with simple diodes the forward bias polarity is determined by the materials forming the junction Transistor symbols on schematic diagrams reveal the bias polarity required to forward bias the base emitter junction The B part of Figure shows transistor symbols with the terminals labeled The other two columns compare the biasing required to cause conduction and cutoff in NPN and PNP transistors If the transistor base emitter junction is forward biased the transistor conducts However if the base emitter junction is reverse biased the transistor is cut off open The voltage drop across a forward biased emitter base junction varies with transistor collector current For example a germanium transistor has a typical forward bias base emitter voltage of 0 2 0 3 volt when collector current is 1 10 mA and 0 4 0 5 volt when collector current is 10 100 mA In contrast forward bias voltage for silicon transistor is about twice that for germanium types about 0 5 0 6 volt when collector current is low and about
11. tutte taunt 10 ms FUNCTION ec FREQUENCY TM 11 6625 2866 14 amp P Model 8444A Performance Tests PERFORMANCE TESTS 4 19 Frequency Accuracy cont d Tracking Generator TRACK ADS ette tette rte Max signal amplitude DEVEL didt dtt dtt tdt dd tet ttis O dBm 52 23 3 dtd desees CCW Test Oscillator FREQUENGY 23a dh 500 kHz 8554B 10 MHz 8555A OUTPUT ATTENUATOR OdBm 3 Allow instruments to warm up and stabilize for at least 2 hours 4 Set Spectrum Analyze SCAN WIDTH PER DIVISION to 5 MHz BANDWIDTH to 30 kHz center FINE TUNE control and set FREQUENCY to 0 MHz Note During all adjustments of FREQUENCY control approach dial setting in a clockwise direction 5 Check displacement of LO feed thru signal from CRT CENTER FREQUENCY graticule line lt 3 Div 6 Connect Test Oscillator 500 output to Frequency Counter and adjust oscillator frequency for an indication of 500 kHz 8554B or 10 MHz 8555A 7 Disconnect cable between Tracking Generator RF OUTPUT and Spectrum Analyzer INPUT 8 Connect Test Oscillator to Spectrum Analyzer INPUT and tune Spectrum Analyzer to Test Oscillator frequency 9 Reduce Spectrum Analyzer SCAN WIDTH PER DIVISION to 5 kHz and BANDWIDTH to 1 kHz keeping signal centered on CRT display with FREQUENCY and FINE TUNE controls 10 Set SCAN WIDT
12. 3 5 OPERATOR S CHECKS 3 6 Upon receipt of the instrument or when the Tracking Generator is to be used with a different Spectrum Analyzer perform the operational adjustment procedures listed i of 3 4 3 1 3 7 OPERATING INSTRUCTIONS 3 8 General operating instructions are contained in Figures 3 3 and 3 4 These instructions will familiarize the operator with basic operating functions of the Tracking Generator in use with Spectrum Analyzers Additional operating techniques and information is contained in Figures 3 5 throug 3 9 CONTROLS INDICATORS AND CONNECTORS 3 10 Front and rear panel controls indicators and connectors are identified and briefly described in and 3 2 Operational adjustment procedures are given i and 3 4 Additional information to assist the user during instrument operation is given in the following paragraphs 3 11 OPERATING TECHNIQUES 3 12 The following information is provided to acquaint the user with Tracking Generator SpectrumAnalyzer operation When a device is placed in the signal path between the Tracking Generator and the Spectrum Analyzer the analyzer detects and displays the frequency response of the device under test Spectrum Analyzer tuning and scan width settings determine the Tracking Generator output frequency and the resultant CRT display The type of device control settings and typical display is provided for each of the following measurements Crystal Filter
13. USAIS 2 USAES 2 ARNG None USAR None E C MEYER General United States Army Chief of Staff USAICS 3 MAAG 1 USARMIS 1 USAERDAA 1 USAERDAW 1 Fort Gordon 10 Fort Carson 5 Army Dep LBAD Fort Gillem 10 USA Dep 1 Sig Sec USA Dep 1 Fort Richardson CERCOM Ofc 2 Units org under fol TOE 2 copies each unit 29 207 29 610 For explanation of abbreviations used see AR 310 50 This manual contains copyright material reproduced by permission of the Hewlett Packard Company TM 11 6625 2866 14 amp P TECHNICAL MANUAL HEADQUARTERS DEPARTMENT OF THE ARMY No 11 6625 2866 14 amp P WASHINGTON DC 29 February 198C OPERATOR S ORGANIZATIONAL DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE MANUAL INCLUDING REPAIR PARTS AND SPECIAL TOOLS LISTS FOR GENERATOR TRACKING SG 1 125 U HEWLETT PACKARD MODEL 84444 NSN 6625 00 185 4802 REPORTING ERRORS AND RECOMMENDING IMPROVEMENTS You can improve this manual by recommending improvements using DA Form 2028 2 Test located in the back of the manual Simply tear out the self addressed form fill it out as shown on the sample fold it where shown and drop it in the mail If there are no blank DA Forms 2028 2 Test in the back of your manual use the standard DA Form 2028 Recommended Changes to Publications and Blank Forms and forward to the Commander US Army Communications and Electronics Materiel Readiness Command ATTN DRSEL ME MG Fort M
14. YES Reconnect third LO cable Disconnect cable WE at Connect jumper between test points 2 and A2TP2 Connect Selectro Female to BNC cable to and measure power for a level of 3 to dBm NO Troubleshaat power supply circuitry Service Sheet 5 Check first LO cable Refer to Spectrum Analyzer RF Section Manual for troubleshooting procedure for first LO circuits NO Check third LO cable Refer to Spectrum Analyzer RF Section Manual for troubleshooting procedure for third LO circuits NO Remove Modutatar Oscillator Driver Assy A2 Power level at A42 15 dBm Connect a 1000 ohm resistor between A4C3 and chassis ground Power levet at M 3 dBm 8 12 Service Adjust A2R17 NULL ADJ for an indicated outpu of 8 dBm Disconnect cable W9 at A543 Connect Power level should be 11 d8m 1 dB Record power level YES dim Disconnect cable W at and measure oscillator frequency Rotate TRACK ADJ control fully COW NO and check for a frequency of 1 548 MHz 500 kHz Rotate TRACK ADJ contro fully CW and check fora frequency of 1 552 MHz 500 kHz Connect Cable W8 tu AT3J2 Disconnect Cable W10 from A6J3 Connect low pass filter with cutoff frequency above the tuned frequency of the RF Section to Measure power output level With 10 dBm applied from the first converter the output level should e approximately 17 dBm fo
15. full scale in 10 dB steps D 1 Model 8444A Table D 1 Frequency Range 500 kHz to 1300 MHz Scan Width Determined by Spectrum Analyzer Controls Per Division 14 Calibrated Scan Widths from a 5 kHz div to 100 MHz div in a 2 5 10 sequence O Scan Analyzer is a fixed tuned receiver Frequency Resolution 3 kHz Stability Residual FM peak to peak 1 kHz for time 0 1 sec Amplitude Accuracy System Frequency Response 41 50 dB 0 5 dB for 8444 058 10 dB for 8558B SWEEP CW GENERATOR Frequency Controlled by Spectrum Analyzer Range 500 kHz to 1300 MHz Scan widths are determined by Spectrum Analyzer controls Frequency Accuracy Same as the 8558B Can be improved using an external counter Flatness 0 5 dB Spectral Purity Residual FM peak to peak 1 kHz for time 0 1 sec Harmonic X Distortion 25 dB below output level typical Nonharmonic spurious Signals 35 dB below output level Long Term Stability Drift typically less than 30 2 10 min 20 kHz for 8558B 10 kHz for 8444A when stabilized after 2 hour warm up Sweep Width 50 kHz to 1000 MHz D 9 SECTION OPERATION D 10 Analyzer TM 11 6625 2866 14 amp P Continued Sweep Rates Selected by Sweep Time per Division on Spectrum Analyzer 16 internal scan rates from 0 1 m Sec div to 10 sec div in a 1 2 5 sequence Manual Sweep is available with a front panel control of the 8558B Auto Sweep is automaticall
16. 8444A 1 HP MODEL 8444A TRACKING GENERATOR Serials Prefixed 1147A and Below IMPROVED POWER SUPPLY STABILITY The 20V power supply stability can be improved by changing A4A1C2 from 24 pF to 1000 pF HP Part No 0160 3456 The new value eliminates any oscillation tendencies and is a recommended modification for all instruments with serials listed above C 1 2 TM 11 6625 2866 14 amp P Model 8444A APPENDIX D MODEL 8444A TRACKING GENERATOR OPTION 058 D 1 INTRODUCTION D 2 This appendix explains the use of an 8444A Tracking Generator with an 8558B 180 Spectrum Analyzer system when Option 058 circuitry is added to the 8444A The Tracking Generator is designed to generate a CW tracking signal for an 8555A 8552 140 Spectrum Analyzer system when operating in the range of 0 5 to 1300 MHz With Option 058 circuits added a 0 5 to 1300 MHz CW tracking signal can also be generated by an 8444A when it is coupled to an 8558B 180 Spectrum Analyzer system D 3 DESCRIPTION D 4 provide a tracking signal for an 8555A 8552 140 Spectrum Analyzer an 8444A Tracking Generator must be fed a 2 05 to 4 1 GHz tuned oscillator signal from the 85554 First LO plus a 500 MHz signal from the 8555A Third LO When mixed with the internal 1 55 GHz oscillator in the 8444A a 0 5 to 1300 MHz tracking signal output is produced D 5 To develop a 0 5 to 1300 MHz tracking signal for an 8558B 180 Spectrum Analyzer Display system a 2 05 to 3 55 GHz First LO is ava
17. ATE E 0 dB TUNING STABIBIZEE SCAN TIME PER DIVISION nennen nnns 20 MILLISECONDS arp LC Mn 10 dB LOG BOG RER LEVEL 10 VIDEO 10 kHz SCANIMODE RM INT SCAN TRIGGER D AUTO 8 Rotate Tracking Generator TRACK ADJ control while observing CRT display NOTE With the 1 55 GHz oscillator tuned to 1550 MHz both the 1500 and 1600 MHz comb signals will produce a response at 50 MHz 9 Adjust the TRACK ADJ control until the responses are separated by 2 MHz 2 divisions on the display 10 Adjust Spectrum Analzyer FREQUENCY control to center largest response on CRT display 11 Reduce BANDWIDTH to 1 kHz and SCAN WIDTH PER DIVISION to 2 kHz while keeping signal centered on display 12 Switch Spectrum Analyzer LOG LINEAR to LINEAR and adjust sensitivity controls for a full eight division display 18 Refer to Figure 5 4 Tune FINE TUNE so that the upward slope of the display intersects the CENTER FREQUENCY graticule line one division from the top NOTE The linear portion of the analyzer IF filter skirt is used to slope detect low order residual FM The analyzer is stabilized and the detected FM is displayed in the time domain Model 8444A ADJUSTMENTS TM 11 6625 2866 14 amp P Adjustments 5 10 1 55 GHz Oscillator Residual FM Check cont d 14 Note where the slope intersect
18. Power Supply Check and Adjustment Test 5 2 1 55 GHz LO Power Level and Frequency Check and Adjustment Test Setup 5 4 8 5 3 1 55 GHz LO Residual FM Check Test Setup 15 6 Demodulation Sensitivity Measurement 5 8 First Converter Check and Adjustment Test cT P 5 9 5 6 First Converter Passband CRT Display 5 10 5 7 Automatic Level Control Check and Adjustment Test Setup 5 11 Level Control Calibration Check and Adjust ment Test 7 14 1 55 GiHz LO Power Level and Check and Adjustment Test Setup 7 2 Figure Page First Converter Circuits Schematic Diagram 7 5 7 3 A7 1 55 GHz Oscillator Assembly Illustrated Parts Breakdown 7 6 8 1 Transistor Operation 8 5 8 2 Examples of Diode and Transistor Marking 8 6 Operational Amplifier Equivalent Circuit 8 7 Major Assembly Locations 8 5 Adjustment and Test Point Locations Tracking Generator Spectrum Analyzer Simplified Block Diagram 8 10 Tracking Generator Block Diagram with Spectrum Analyzer Interconnections 8 1 1 8 7A Troubleshooting Tree Tracking Generator Troubleshooting Block Diagram 8 13 Mixer Diode Form
19. THIRD LO 85548 CABLE ASSEMBLY 08441 6012 FIRST LO 8454B 8555A Figure 4 1 Output Level and Flatness Test Setup EQUIPMENT Spectr m Analyzer iiie HP 8554B or 8555A 8552B 141T Power H 435 Power 5 aise Anam 8482 Frequency GCOUnter edema eee HP 5340A Adapter Type to BNC Female HP 1250 0780 Interconnect Cable 8555A THIRD LO esse HP 08444 60017 Interconnect Cable two HP 08444 60018 Cable Assembly RF ssssssssssssssseesseeeee nennen nnns HP 08441 6012 11 6625 2866 14 amp P 8444 PERFORMANCE TESTS 4 16 OUTPUT LEVEL AND FLATNESS Cont d PROCEDURE 1 Perform preset adjustment procedures baragraph 4 7 8554B 8552B 141T Spectrum Analyzer System or for 8555A 8552B 141T Spectrum Analyzer System 2 Connect test setup as shown ir Figure 4 1 and set controls as follows Power Meter RANGE ac ED O dBm EINE cuente UEM E ON CAL FACTOR See Power Sensor Frequency Counter RANGE UE 10 Hz 18 GHz MEME RESOLUTION 2 100 Tracking Generator MANUALE SCAN Fully Counterclockwise E AVA
20. The 20 volt supply is adjustable and provides the reference for the 10 volt supply These checks verify proper operation of the power supplies W5MT3A MULTIFUNCTION VARIABLE VOLTAGE VOLTMETER TRANSFORMER AC VOLTMETER CABLE ASSEMBLY STEP 4 STEP 10 DIGITAL VOLTMETER Figure 5 1 Power Supply Check and Adjustment Test Setup EQUIPMENT Digital Voltmeter with 3443A HP 3440A AC Voltmeter Multifunction Voltmeter 2 HP 410C Variable Voltage Transformer General Radio 5 AG Voltmieler usce ee eee HP 400E Cable Assy terminated with probe and alligator clip HP 10501A Cable Assy dual banana plug to probe and alligator clip HP 11003A PROCEDURE 1 Connect test setup as indicated Figure 5 1 2 Remove top cover and right side cover from Tracking Generator 3 Connect digital voltmeter test leads to AITP1 and chassis ground 4 Remove shield from power line module and connect ac voltmeter HP 410C across the outside terminals of the ACCESSORY OUTLET connector J6 The outside terminals of J6 are connected by the 98 and 908 color coded wires to the power line module 5 2 11 6625 2866 14 amp P Model 8444A Adjustments ADJUSTMENTS 5 10 11 12 13 Apply power to the Tracking Generator Measure and record the 20 volt output Vary the input ac line volt
21. division log range For precision frequency measurements to 500 MHz For precision frequency measurements over frequency range of 0 to 50 MHz and 150 to 3000 MHz Hardware and parts for strapping Tracking Generator to Spectrum Analyzer Provides a common ground and secure mounting For accessory instrument operation off of line input to Tracking Generator Plugs mate with accessory outlet connector and line input connector on For accessory instrument operation off of line input to Tracking Generator Plugs mate with accessory outlet connector and line input connector To install instrument in 19 inch rack 8120 1515 Accessory Power Cord 5060 1189 power line module HP 8120 1576 Accessory Power Cord 1251 0148 old type 5060 8739 Rack Mount ing Kit 1 7 1 8 Model 8444A TM 11 6625 2866 14 amp P Installation SECTION II INSTALLATION 2 1 INITIAL INSPECTION 2 2 Mechanical Check 2 8 Check the shipping carton for evidence of damage immediately after receipt If there is any visible damage to the carton request the carriers agent be present when the instrument is unpacked Inspect the instrument for physical damage such as bent or broken parts and dents or scratches If damage is found refer to paragraph 2 6 recommended claim procedures If the instrument appears to be undamaged perform the electrical check see paragraph 2 4 The packaging mater
22. potentiometer Adjustments in the oscillator driver conect for minor vari ations in the sensitivity of the oscillator from unit to unit These adjust ments set the upper and lower tuning range limits for the front panel TRACK ADJ potentiometer Potentiometer A2R26 is adjusted to provide a 4 Milz frequency tuning of the oscillator from the front panel TRACK ADJ con trol Refer to paragraph 5 9 for adjustment procedure TROUBLESHOOTING PROCEDURE When a malfunction has heen isolated to the 500 MHz amplifier PIN diode modulator and driver circuits or to the 1 55 GHz oscillator and converter circuits perform the appropriate checks below Refer to Service Sheet 2 for overall troubleshooting procedure EQUIPMENT REQUIRED Digital Voltmeler HP 3440A13443A Frequency Counter essen HP 5245 52548 Power Meter Spectrum Analy HP 432A 8478B HP 8554B or 82554 Selectro to BNC Cable HP 11492 60001 Adapter BNC Jack to BNC U6 9144 U HP 1250 0080 Dc Volt Ohm Meter HP 412A 500 MHz AMPLIFIER PIN DIODE MODULATOR ASSEMBLY A4 With power removed disconnect at Add and W6 at 122 Remove eight screws securing the cover of the Ad assembly The assembly is mounted on the underside of the A4 cover Invert the cover and 4 1 assembly Connect CPI to AdJ1 and W6 to 442 Connect ground strap between the cover and chassis ground Position the assembly so that the vollage leads
23. tt AUTO Tracking Generator Peak signal indication on CRT LEVEL OdBm 2 Adjust TRACK ADJ for maximum signal indication on CRT display 3 Disconnect cable between Tracking Generator RF OUTPUT and Spectrum Analyzer INPUT 4 Connect Thermistor Mount and Power Meter to Tracking Generator RF OUTPUT 5 Adjust A2R41 dBm LEVEL for an indication of 0 0 5 dBm on Power Meter 6 Set Tracking Generator LEVEL control fully counterclockwise 7 Adjust A2R40 10 dBm LEVEL for an indication of 10 to 12 dBm on Power Meter 8 Set Tracking Generator LEVEL control to 0 dBm 9 Repeat steps 5 through 7 until Power Meter indicates 0 dBm with LEVEL control fully clockwise 10 Disconnect Power Meter and Thermistor Mount from Tracking Generator RF OUTPUT T3 Connect cable between Tracking Generator RF OUTPUT and Spectrum Analyzer INPUT 12 Set Tracking Generator TRACK ADJ for maximum signal level on Spectrum Analyzer display 13 Note and record signal level at 30 MHz 0 0 5 dBm 5 14 Model 8444A TM 11 6625 2866 14 amp P Adjustments Table 5 1 Check and Adjustment Test Card Hewlett Packard Model 8444A Tracking Generator Serial No Tested by Date Test Description Power Supply Check and Adjustment 20 Vdc supply 10 Vdc supply 20 Vdc supply ripple 10 Vdc supply ripple 1 55 GHz Oscillator Power Level Frequency Check an
24. 0414 0855400007 1854 0323 1854 0323 06983447 0757 0280 0757 0280 0844460031 0160 2055 0160 2055 0180 00492 01800049 1901 00402 1901 0040 185404042 1854 0404 2100 1775 06983155 06983155 06980083 06980082 08444 60025 po Ae a a iA Table D 2 Replaceable Parts Description 500 MHz OSCILLATOR ASSEMBLY C FXD 100 80 20 500WVDC CER C FXD 10000PF 80 20 500WVDC CER CONNECTOR 50 OHM COUPLING LO OUTPUT R FXD 31 6 OHM 2 05W OSCILLATOR ASSEMBLY 500 MHz C FXD 3 9PF f 25PF 500WVDC CER C VAR TRMR 1 9 8 5PF AIR INDUCTOR 500 MHz OSC TRANSISTOR NPN TRANSISTOR NPN R FXD 422 OHM 196 1 8W R 1K OHM 1 1 8W R FXD 1K OHM 1 1 8W POWER SUPPLY FILTER ASSEMBLY C FXD 01 U F 80 20 10WVDC CER C FXD O1U F 80 20 100WVDC CER C FXD 20UF 75 10 50WV DC AL C FXD 20UF 75 10 50WVDC AL DIODE SWITCHING 2NS 30V 50 DIODE SWITCHING 2NS 30V 50MA TRANSISTOR NPN TRANSISTOR NPN R VAR 5K OHM 5 WW R FXD 4 64K OHM 1 1 8W R FXD 4 64K OHM 1 1 8 R FXD 1 96K OHM 1 1 8W R 464 OHM 1 1 8W CABLE COAX 500 MHz OUTPUT Mfr Part Number 08444 60024 0160 2357 0160 2357 1250 0828 08554 00015 C3 1 8 TOO 31 R6 G 08444 60020 0160 2247 189 253 5 MODIFIED 08554 00007 1854 0323 1854 0323 C4 1 8 TO 422R F C4 1 8 TO 1001 F C4 1 8 TO 1001 F 08444 60031 0160 2055 0160 2055 300206G050CC2 300206G050CC2 1901 0040 1901 0040 1854 0404 1854 0404 2100 1775 C4 1 8T
25. 0757 0401 A2R20 0757 0416 1 R FXD FLM 511 OHM 1 1 8W 28480 0757 0416 2 21 0698 3450 1 R FXD FLM 42 2K OHM 1 1 18W 28480 0698 3450 A2R22 0757 0401 R FXD FLM 100 OHM 1 1 8W 28480 0757 0401 A2R23 0757 1094 1 R FXD MET ELM 1 47K OHM 1 1 8W 28480 0757 1094 A2R24 0757 0424 R FXD MET FLM 1 10K OHM 1 1 8W 28480 0757 0424 A2R25 0698 3441 R FXD FLM 215 OHM 1 1 8W 28480 0698 3441 A2R26 2100 2522 1 R VAR CERMET 10K OHM 10 LIN 1 2W 28480 2100 2522 A2R27 2100 1758 R VAR WW 1K OHM 5 TYPE V 1W 28480 2100 1758 A2R28 0757 0442 4 R FXD MET FLM 10 0K OHM 1 1 8W 28480 0757 0442 A2R29 0757 0465 R FXD MET FLM 100K OHM 1 1 8W 28480 0757 0465 A2R30 0757 0288 2 R FXD FLM 9 09K OHM 1 1 8W 28480 0757 0288 A2R31 0757 0442 R FXD FLM 10 0K OHM 1 1 8W 28480 0757 0442 A2R32 0757 0438 R FXD MET FLM 5 11K OHM 1 1 8W 28480 0757 0438 A2R33 0698 3441 R FXD FLM 215 OHM i1 1 8W 28480 0698 3441 A2R34 0757 0442 R FXD FLM 10 0K OHM 1 1 8W 28480 0757 0442 A2R35 0698 3399 1 R FXD FLM 133 OHM 1 1 2W 28480 0698 3399 A2R36 0757 0439 R FXD MET FLM 6 81K OHM 196 1 8W 28480 0757 0439 A2R37 0757 0421 1 R FXD MET ELM 825 OHM 1 1 8W 28480 0757 0421 A2838 0698 3438 1 R FXD FLM 147 OHM 1 1 8W 28480 0698 3438 A2R39 0757 0288 R FXD FLM 9 09K OHM 1 1 8W 28480 0757 0288 A2R40 2100 2522 1 R VAR WW 10K OHM 10 TYPE V 1W 19701 ET50X103 A2R41 2100 1760 R VAR WW 5K OHM 5 TYPE V 1W 28480 2100 1760 A2R42 0698 3151 1 R FX
26. 11 1902 0761 1 DIODE BREAKDOWN 5 9 TO 6 5V 12954 1N821 1 12 1901 0159 DIODE SILICON 0 75 400PIV 04713 SR1358 4 13 1901 0156 DIODE SILICON 0 75 400 04713 SR1358 4 A1CR13 1901 0159 DIODE SILICON 0 75A 400PIV 04713 SR1358 4 14 1901 0159 D1ODE SILICON 0 75A 400PIV 04713 SR1358 4 A1CR15 1901 0159 DIODE SILICON 0 75A 400PIV 04713 SR1358 4 AiCR16 1901 0040 DIODE SILICON 30MA 30WV 07263 FDG1088 ATF1 2110 0012 2 FUSE 0 5 AMP 250V 75915 312 500 1 2 2110 0012 FUSE 0 5 250V 75915 312 500 A1MP1 2110 0269 4 CL1P FUSE 0 250 DIA 91506 6008 32CN A1MP2 2110 0269 CL1P FUSE 0 250 DIA 91506 6008 32CN A1MP3 2110 0269 CLIP FUSE 0 250 D1A 91506 6008 32CN A1MP4 2110 0269 CLIP FUSE 0 250 D1A 91506 6008 32CN A1Q1 1853 0020 7 TSTR SI PNP SELECTED FROM 2N37021 28480 1853 0020 A1Q2 1853 0012 2 TSTR SI PNP 80131 2N2904A A1Q3 1854 0039 2 TSTR SI NPN 80131 2N3053 A1Q4 1854 0071 3 TSTR SI NPN SELECTED FROM 2N3704 28480 1854 0071 105 1853 0020 TSTR SI PNP SELECTED FROM 2N3702 28480 1853 0020 106 1854 0039 TSTR SI NPN 80131 2N3053 A1Q7 1854 0071 TSTR SI NPN SELECTED FROM 2N3704 28480 1854 0071 1 1 0698 3160 2 R FXD FLM 31 6K OHM 1 1 8W 28480 0698 3160 ATR2 0698 3445 2 R FXD FLM 348 OHM 1X 1 8W 28480 0698 3445 0757 0440 4 R FXD FLM 7 50K OHM tt 1 8W 28480 0757 0440 AIR4 0811 1666 2 R FXD MWW 1 0 OHM 5 2W 28480 0811 1666 1 5 0698 3441 4 R FXD FLM 215 OHM 12 1 8W 28490 0698
27. 2266 C FXD CER 24PF 5 500 VDCW 72982 301 000 COGO 240J A7 08444 60003 OSCILLATOR ASSY 1 55 GHz NOT RECOMMENDED FOR FIELD REPAIR A7 C10160 3549 C FXD PORC 0 5 0 1 PF 500 VDCW 28480 0160 3549 Delete A7C4 10698 7205 R FXD FLM 51 1 OHM 2 1 8W Delete C3 Delete R5 Figure 8 12 Service Sheet 3 Replace wit 11 6625 2866 14 amp Manual Changes Model 8444A 40019 LN Ag Ag mj os 0006 77 wn M li WHOIS 30010 339 ee i 2D M MOQYMONGO SMON 20 SNOLIVN21530 324343334 ASSY 4019111550 01 ONNONI 5155 2 i 3 310N OUYWHOS 335 11 SHON Hu ux dM 09 ZV AS SY 4010150 661 C 7 7 E dob 1 0 I mei 1 1 s veon ri 017 2 1270 0 5 gt AW yee M r 9 za c L_4 169 win SS HOLYIROOW 30010 PRNO ASSY AXI 15303 TE S WW ASSY HOLYYIOOARITHU Mw wr ASSY ISYA Schematic Diagram Manual Figure 8 12 C Figure 7 2 First Converter Circuits 11 6625 2866 14 amp Model 8444A Manual Changes 52 20 A A Figure 7 3 A 7 1 55
28. 28480 08444 20021 W11 08444 20019 1 CABLE ASSY RF OUTPUT AUXILIARY 28480 08440 20019 12 08444 20023 1 CABLE ASSY RF OUTPUT 28480 08444 20023 13 08444 60016 1 CABLE ASSY THIRD LO INPUT 28480 08444 60016 W14 08444 60018 3 CABLE ASSY RF INTERCONNECT 28480 08444 60018 15 08444 60018 CABLE ASSY RF INTERCONNECT 28480 08444 60018 W16 08444 60018 CABLE ASSY RF INTERCONNECT 28480 08444 60018 17 08444 60017 1 CABLE ASSY INTERCONNECTING 28480 08444 60017 W18 8120 1348 1 CABLE LINE POWER 28480 8120 1348 XA1 1251 0159 1 CONNECTOR PC EDGE 2 X 15 CONTACT 71785 251 15 30 261 XA2 1251 0135 1 CONNECTOR PC EDGE 15 CONTACT 95354 91 6915 1500 00 XFI 1400 0011 2 CLIP FUSE 75915 125002 XF1 1400 0011 CLIP FUSE 75915 125002 XQ1 1200 0041 2 SOCKET TRANSISTOR 71785 133 32 10 013 XQ2 1200 0041 SOCKET TRANSISTOR 71785 133 32 10 013 08444 60013 1 WIRING HARNESS 28480 08444 60013 1 9100 3308 1 TRANSFORMER POWER 115 230 28480 9100 3308 48 440 2 TM 11 6625 2866 14 amp P Model 8444A Replaceable Parts Table 6 2 Replaceable Parts Reference HP Part Number Qty Description Mfr Mfr Part Number Designation Code MECHANICAL PARTS MP1 1490 0030 1 STAND TILT 28480 1490 0030 MP2 5000 0050 2 TRIM SIDES 28480 5000 0050 MP3 5000 0730 2 COVER SIDE 3 X 16 BLUE GRAY 28480 5000 0730 MP3 5000 8593 2 COVER SIDE 3 X 16 OLIVE GRAY 28480 5000 8593 MP4 5020 0900 1 TRIM PANEL LIGHT GRAY 28480 5020 0900
29. 6 Model 8444A Wrench Wrench Test Lead Resistor Wrench Low pass Filter HP 8554B Table 1 3 Open end 5 16 inch No 10 Allen Driver Test lead with alligator clips 100 ohm 5 1 watt Open end 15 64 inch 100 MHz Cut off HP 360A TM 11 6625 2866 14 amp P General Information Test Equipment and Accessories 3 of S Minimum Specifications Suggested Model HP 8720 0030 HP 5020 0291 common 0757 0367 1 8710 0946 T T P Performance Test A Adjustments T Troubleshooting Table 1 4 Operating Accessories RF Section Spectrum Analyzer RF Section with frequency range of 500 kHz to 1250 MHz HP 8555A RF Section Spectrum Analyzer RF Section with frequency range of 01 to 18 GHz When used with Tracking Generator covers frequency range of 10 to 1300 MHz Display Section Spectrum Analyzer Display Section compatible with Tracking Generator Display Section Spectrum Analyzer Display Section with storage CRT display capability Compatible with Tracking Generator HP 8552 IF Section Spectrum Analyzer IF Section compatible with Tracking Generator 10 dB per division log range HP 8552B HP 5300A 5303A 52451 52540 IF Section Frequency Counter Frequency Counter HP 5060 8543 Joining Bracket Kit Spectrum Analyzer IF Section compatible with Tracking Generator 2 dB per
30. GHz Oscillator Assembly Illustrated Parts Breakdown Manual Figure 8 19 1 of 2 for Change C 7 6 11 6625 2866 14 amp Model 8444A Manual Changes 7 6 MANUAL CHANGE SUPPLEMENT This supplement contains important information for adapting the manual to instruments containing improvements made after the printing of the manual To use this supplement Make all appropriate serial number related changes indicated in the tables below Serial Prefix or Number Make Manual Changes Serial Prefix or Number Make Manual oranges ______ 1601A 1630A f CHANGE 1 6 6 Table 6 2 Change A8 HP Part Number to 0960 0444 Page 6 7 Table 6 2 Change SI HP Part Number to 3101 1395 Figure 8 17 Service Sheet 5 Replace ON OFF switch 1 and POWER LINE MODULE A8 wiring diagram and schematic with Figure 1 of this MANUAL CHANGES 11 6625 2866 14 amp P Model 8444A Service SECTION VIII SERVICE 8 1 INTRODUCTION 8 13 This exchange module should be ordered from 8 2 This section provides instructions for trouble the nearest Hewlett Packard Sales and Service office shooting and repair of the HP Model 8444A Tracking Generator 8 3 PRINCIPLES OF OPERATION 8 4 Information relative to the principles of operation appears on the foldout pages opposing the Block Diagram Service Sheet 1 Theory of operation appears on the foldout pages facing each of the foldout schematic diagrams The schematic diagram circuits are
31. Generator LEVEL control to 0 dBm and adjust TRACK ADJ for maximum signal amplitude indication on CRT display 10 Adjust Spectrum Analyzer Vernier control or Tracking Generator LEVEL control to position signal on CRT LOG REF level graticule line System calibrated at 30 MHz with an amplitude accuracy of 10 5 dB 11 Set Spectrum Analyzer to scan desired frequency range FREQUENCY control adjusted to center of frequency of interest SCAN WIDTH set for desired coverage 12 Insert device to be tested between Tracking Generator RF OUTPUT and Spectrum Analyzer RF INPUT 13 Rotate Tracking Generator MANUAL SCAN control fully counterclockwise 14 Set Spectrum Analyzer SCAN MODE switch to EXT 15 Rotate Tracking Generator MANUAL SCAN control clockwise to tune system through selected frequency range 16 For automatic scanning set SCAN MODE switch to INT and SCAN TIME PER DIVISION to desired scan time Figure 3 4 Tracking Generator Operation with 8555A Spectrum Analyzer 2 of 2 Model 8444A 3 13 Crystal Filter Measurement 3 14 illustrates the CRT display for a 20 MHz crystal filter Filter characteristics 2 kHz passband with bandwidth at the 60 dB points less than 10 kHz a Spectrum Analyzer 8555A control settings FREQUENCY 20 MHz BANDWID IF 3 kHz SCAN WIDTH PER DIVISION 5 kHz INPUT ATTENUATION
32. HP 410C Multifunction Voltmeter Frequency Counter Test Oscillator Frequency Range 500kHz 1 6GHz Frequency Accuracy 0 01 Frequency Range 10 Hz 10 MHz Frequency Accuracy 3 Output Amplitude 3 Vrms Output Impedance 50 ohms HF Signal Generator Frequency Range 1 50 MHz Output Amplitude gt 0 dBm Frequency Accuracy 1 Output Impedance 50 ohms HP 5340A Frequenc Counter with HP 5254C Frequency Converter HP 652A Test Oscillator HP 606A B HF Signal Generator VHF Signal Generator Frequency Range 50 450 MHz Output Amplitude gt 0 dBm Output Impedance 50 ohms UHF Signal Generator Digital Voltmeter Frequency Range 450 1200 MHz Output Amplitude 0 dBm Output Impedance 50 ohms Voltage Accuracy 0 2 Voltage Range 1 30 Vde Polarity Automatic Indication HP 608E F VHF Signal Generator HP 612A UHF Signal Generator HP 34404 Digital Volt meter w HP 3443A Plug in P Performance Test Adjustments T Troubleshooting Model 8444A TM 11 6625 2866 14 amp P General Information Table 1 3 Test Equipment and Accessories 2 of S Minimum Specifications Suggested Model Use Variable Voltage Voltage Range 102 127 Vac General Radio WOMT3A A T Transformer or Superior Electric UC1M Power Supply Dual De Output Voltage Variable 0 20 Vdc HP 6205B Power Supply A T Output Current 0 200 mA Meter Accuracy 58 Cont
33. LINE MODULE NON FILTERED 28480 5060 1189 6 6 TM 11 6625 2866 14 amp P Model 8444A Replaceable Parts Table 6 2 Heplaceable Parts Reference HP Part Number Qty Description Mfr Mfr Part Number Designation Code CHASSIS PARTS AT1 0960 0084 2 ISOLATOR 2 PORT 2 4 GHZ 28480 0960 0084 AT2 0960 0084 ISOLATOR 2 PORT 2 4 GHZ 28480 0960 0084 0960 0168 1 ISOLATOR 2 PORT 1 54 1 56 GHZ 28480 0960 0168 11593 1 TERMINATION 50 OHM 28480 11593A C1 0180 2181 2 C FXD ELECT 1300 UF 75 10 50VDCW 56289 3601320050AA2A DQ8 1 1210 0013 2 BRACKET MOUNTING FOR 1 3 8 OD 56289 4586 87A 2 0180 2181 C FXD ELECT 1300 UF 75 10 50VDCW 56289 3601320050A02A DQB 2 1210 0013 BRACKET MOUNTING FOR 1 3 8 OD 56289 4586 87A 3 0160 0155 1 C FXD MY 0 0033 UF 10 200VDCW 28080 0160 0155 Pi 1250 0838 1 CONNECTOR RF ADAPTER TEE 98291 50 085 0000 F1 2110 0202 1 FUSE 0 50A 250V SLOW BLOW 75915 313 5005 F1 FOR 115V OPERATION F1 2110 02011 FUSE 0 25A 250V SLO BLO 71400 MDL 1 4 FL1 FOR 230V OPERATION FL1 0960 0167 1 FILTER TUBULAR BANDPASS 2 0 3 4 GHZ 28480 0960 0167 1MPI 1250 0914 1 BODY RF CONNECTOR 02660 131 150 J1MP2 1250 0915 1 CONTACT RF CONNECTOR 02660 131 149 1 5040 0306 1 INSULATOR 28480 5040 0306 J1M4 08555 20093 1 CONTACT JACK 28480 08555 20093 1 5 08555 20094 1 BODY BULKHEAD 28480 08555 20094 J1MP6 2190 0444 1 WASHER LOCK 00000 O8D J1MP7 2950 0132 1 NUT HEX 7 16 28 00000 O8D J1MP8 08761 2027 1 INSULATOR 28480 08761 2027 U4 1250
34. MP4 5020 6850 1 TRIM PANEL MINT GRAY 28480 5020 6850 MP5 5020 0901 1 TRIM PANEL LIGHT GRAY 28480 5020 0901 MP5 5020 6851 1 TRIM PANEL MINT GRAY 28480 5020 6851 MP6 5040 0170 4 GUIDE PLUG IN PC BOARD 28480 5040 0170 MP7 50b0 0730 2 FRAME ASSY 3 X 16 28480 5060 0730 MP8 5060 0740 1 COVER ASSY TOP 16L BLUE GRAY 28480 5060 0740 MP8 5060 8589 COVER ASSY TOP 16L OLIVE GRAY 28480 5060 8589 MP9 5060 0752 1 COVER ASSY BOTTOM 16L BLUE GRAY 28480 5060 0752 MP9 5060 8713 1 COVER BOTTOM 28480 5060 8713 MP10 5060 0767 5 FOOT ASSY FM 28480 5060 0767 MP11 5060 0774 1 RACK MOUNTING KIT 3H LIGHT GRAY 28480 5060 0774 MP11 5060 8739 1 KIT RACK MOUNT 3H MINT GRAY 28480 5060 8739 MP12 08443 40002 1 TRIM STRIP LIGHT GRAY 28480 08443 40002 MP12 08443 40005 1 TRIM STRIP MINT GRAY 28480 08443 40005 MP13 08444 00001 1 PANEL FRONT BLACK LIGHT GRAY 28480 08444 00001 MP13 08444 00013 1 PANEL FRONT OLIVE BLACK MINT GRAY 28480 08444 00013 MP14 08444 00002 1 PLATE CONNECTOR 28480 08444 00002 MP14 08444 00015 1 PLATE CONNECTOR OLIVE BLACK 28480 08444 00015 MP15 09444 00003 1 DECK MAIN 28480 08444 00003 MP16 08444 00004 PANEL REAR 28480 08444 00004 MP17 09444 00007 1 GUARD 28480 08444 00007 MP18 08445 00008 4 CLAMP FRONT PANEL TRIM 28480 08445 00008 Table 6 3 Code List of Manufacturers MFR ZIP NO MANUFACTURER NAME ADDRESS CODE 00000 U S A COMMON ANY SUPLIER OF U S A 00779 AMP INC AIRCRAFT MARINE PROD HARRISBURG PA 17101 01121 ALLEN BRADLEY CO MILWA
35. Measurement Para 3 13 Bandpass Filter Measurement Para 3 15 Low Pass Filter Measurement Para 3 17 Swept Return Loss Measurement 3 19 Amplifier Gain and Bandwidth Measurement f Precision Frequency Measurement Para 3 23 Model 8444A TM 11 6625 2866 14 amp P Operation 3 FRONT PANEL LINE ON OFF Controls primary power to Tracking Generator Light glows when switch is energized Type A1H bulb For access to bulb switch to OFF and pull button straight out MANUAL SCAN Provides manual tuning of Spectrum Analyzer Controls voltage level at SCAN OUTPUT 8 below Scan trace on CRT determined by position of MANUAL SCAN control For MANUAL SCAN operation connect cable between Tracking Generator SCAN OUTPUT and Spectrum Analyzer SCAN IN OUT Set Spectrum Analyzer SCAN MODE switch to EXT Vary MANUAL SCAN control to tune analyzer through selected SCAN WIDTH TRACK ADJ Adjusts frequency of 1 55 GHz oscillator in Tracking Generator so that the RF OUTPUT 5 tracks the frequency tuning of the Spectrum Analyzer Control adjusted for maximum amplitude indication of trace on CRT display Ten turn control provides adjustment of frequency over a range of approximately 4 MHz LEVEL Adjusts Tracking Generator RF OUTPUT 5 level over range of 0 to 10 dBm Level calibrated dBm at 30 MHz with accuracy of 0 5 dB Set LEVEL control to 0 dBm for calibrated CRT display on Spe
36. NOTES 2 12 MHz y e TT LOSS 12 d SGD vars B spy T VOS 1 AMPLIFIER AND ALC DETECTOR ASSY TM 11 6625 286614 amp P MODULATOR OSCILLATOR DRIVER ASSY A2 REFERENCE DIODE SIGNAL RF DIODE SIGNAL o qu I n 0 LOW m Lach ATTENUATOR PASS LEVEL LOW PASS RF OUTPUT FILTER DETECTOR Furr d Cap lt eo dd qe ey SCAN OUTPUT Y Pio 1 Figure 8 8 Tracking Generator Troubleshooting Block Diagram 8 13 20 V REGULATOR dv REGULATOR MANUAL SCAN ERVICE SHEET 3 HEORY OF OPERATION Sheet 3 contains the schematic diagram for the 500 MHz mplifier PIN Diode Modulator Attenuator A4 the Modulator Oscillator river A2 First Converter A5 and the 1 55 GHz Oscillator AT 1 500 MHz AMPLIFIER PIN DIODE MODULATOR ATTENUATOR A4 he 500 MHz amplifier and PIN diode modulator consists of amplifier 44191 through Q3 and PIN diodes A4CR1 and The three mplifier provides isolation between the Tracking Generator attenuator and xer citeuits and the Spectrum Analyzer 500 LO circuit The mplifier functions as limiter in the forward direction of the 500 Milz gnal while providing approximately 55 dB attenuation in the reverse irection This isolation prevents signals from the first mixer and changes i
37. PNP SELECTED FROM 2N3702 28480 1853 0020 A2Q5 1853 0020 TSTR SI PNP SELECTED FROM 2N3702 28480 1853 0020 A2Q6 1854 0071 TSTR SI NPN SELECTED FROM 2N3704 28480 1854 0071 A2Q7 1853 0020 TSTR SI PNP SELECTED FROM 2N3702 28480 1853 0020 A208 1853 0012 TSTR SI PNP 80131 2N2904A A2R1 0757 0346 3 R FXD MET FLM 10 OHM 1 1 8W 28480 0757 0346 A2R2 0698 3454 2 R FXD MET FLM 215K OHM 195 1 8W 28480 0698 3454 A2R3 0757 0280 R FXD MET FLM 1K OHM 1 1 8W 28480 0757 0280 2 4 0757 0280 R FXO FLM 1K OHM 1 1 8W 28480 0757 0280 A2R5 0757 0438 R FXO MET FLM 5 11K OHM 196 1 8W 28480 0757 0438 A2R6 2100 1760 3 R VAR WW 5K OHM 5 TYPE V 1W 28480 2100 1760 A2R7 2100 1760 R VAR WW 5 OHM 5 TYPE V 1W 28480 2100 1760 A2R8 0698 3444 1 R FXD MET ELM 316 OHM 1 1 8W 28480 0698 3444 A2R9 0698 3156 1 R FXD FLM 14 7K OHM 1 1 8W 28480 0698 3156 A2R10 0757 0346 R FXD MET FLM 10 OHM 1 1 8W 28480 0757 0346 A2R11 0698 3154 1 R FXD MET FLM 4 22K OHM 1 I BW 28480 0698 3154 A2R12 0757 0346 R FXD MET FLM 10 OHM 1 1 8W 28480 0757 0346 A2R13 0698 3454 R FXD FLM 215K OHM 1 1 8W 28480 0698 3454 A2R14 0757 0424 2 R FXD MET FLM 1 10K OHM 1 1 8W 28480 0757 0424 A2R15 0698 3437 1 R FXD MET FLM 133 OHM 196 18W 28480 0698 3437 A2R16 0757 0817 1 R FXD FLM 750 OHM 1 1 2W 28480 0757 0817 A2R17 2100 1758 R VAR WW IK OHH 5t TYPE V 1W 28480 2100 1758 A2R18 0698 3445 R FXD MET ELM 348 OHM 196 18W 28480 0698 3445 A2R19 0757 0401 R FXD FLM 100 OHM 1 1 8W 28480
38. Page Model 8444A Tracking Generator and Accessories 1 0 Instrument Identification 1 2 2 1 Power Cable Line Connector Labels 2 2 Model 8444A Tracking Generator Front Panel Controls Indicators and Connectors 3 2 Model 8444A Tracking Generator Rear Panel Controls and Connectors 3 3 Tracking Generator Operation with 8554B Spectrum Analyzer Tracking Generator Operation with 8555A Spectrum Analyzer 1 3 6 20 MHz Crystal Filter CRT Display 3 8 3 6 50 MHz Bandpass Filter CRT Display 3 8 3 7 23 MHz Low Pass Gilter CRT Display 3 9 Swept Return Loss Measurement CRT Display oisi oca Amplifier Gain and Bandwidth CRT Display 3 9 Precision Frequency Measurement CRT Display OE Output Level amp Flatness Test Setud 4 3 Residual FM Test Setup Demodulation Sensitivity 4 8 4 4 System Flatness Test Setup 4 9 4 5 Frequency Accuracy Test Setup 4 11 4 6 Harmonic Distortion Test Setup 4 13 4 7 Typical Harmonic Distortion CRT Display to 100 2 4 4 15 4 8 Typical Harmonic Distortion CRT Display 0 to 500
39. a ATS ISOLATOR 15 ee 900181 NOTES 11 8520 759 35 Service 1 SEE SCHEMATIC DIAGRAM NOTES TABLE 8 3 CHASSIS GROUND ADJACENT OSCILLATOR ASSY REFERENCE DESIGNATIONS 1 m m 6 155 GH OSCILLATOR DRIVER Bui RE REFERENCE OESGAATIONS ITHN OUTLINED i ant MENBIES ARE ABBREVIATED FULL DESIGRATION 1 CLUDES AISENBLY HUMBER eg RI OF EM 18 AiR DEIRATONS OF OTHER COMPONENTS ARE at at M Li I il 03 n n u 4 eon 8 01 03 41 r1 13 3 Figure 8 12 First Converter Circuits Schematic Diagram 8 15 Service TM 11 6625 2866 14 amp P Model 8444 1 MP2 MPI lac OPTION 005 J1 Figure 8 13 J1 RF Output Connector Exploded View SERVICE SHEET 4 THEORY OF OPERATION Service Sheet 4 contains the schematic diagram f r the first LO input circuit the second converter and the amplifier ALC detector and level control circuits lll FiRST Lo INPUT The first LO input circuit consists of Isolators AT1 AT2 and Filter FL1 Isolators and allow the first LO input signal to be applied to the second converter while preventing the flow of signals from second converter back to the input Filter is a bandpass filter over the 2 t
40. and signal lead are not shorted to ground Apply power to the Tracking Generator Measure the voltage drop across each of the PIN diodes With no 500 MHz input signal to the 500 MHz amplifier the voltage drop across each diode should he 0 8 0 2 Vde Measure the emitter base and collector voltages for transistors A441Q1 through Q3 and compare with ypieal values shown on the schematic diagram Troubleshoot stage or stages vith voltage levels that do not compare with typical values shown on ematic Replace defective component and perform ALC NULL ustment paragraph 5 12 and LEVEL adjustment paragraph 5 13 SERVICE SHEET 3 cont d H woouLaToR oriver circuit Check Amplifier and ALC Detector Assembly A3 Service Sheet 4 prior to checking the modulator driver circuit Connect a shorting strap between test points A2TPl and AZTP2 Connect a shorting strap between A2TP1 and chassis ground Apply power to Tracking Generator Measure and record voltage level at A4C2 PIN diode drive signal Vde Rotate NULL ADJ A2R17 throughout its tuning range and record level diode modulators 5 to Vde Compare with typical range of 14 to 19 7 Vde If the output is not within the typical limits connect digital voltmeter to junction of A2R15 and R16 Adjust A2R17 for an indicated voltage of 19 3 at the emitter of 205 Troubleshoot the output using typical voltage levels given for the emitter base and collector of
41. are contained in the table Each performance test lists the required test equipment and contains an illustrated test equipment setup 4 5 FRONT PANEL CHECKS 4 6 Before proceeding to the performance tests the instruments must be adjusted and all controls set as specified in the preset adjustment procedures for the appropriate system 8554B 8555A The instruments should perform as called out in the preset adjustment procedures before going on to the performance tests 4 7 Preset Adjustments 8554B 8552B 141T 8444A System 4 8 Procedure a Apply power to Tracking Generator and Spectrum Analyzer b Turn Spectrum Analyzer INTENSITY control fully CCW c Allow instruments to warm up for at least 30 minutes d Perform Spectrum Analyzer 30 MHz calibration procedure Refer to 8554B RF Section Operating Manual 4 1 e Connect Spectrum Analyzer FIRST LO OUTPUT to Tracking Generator FIRST LO INPUT f Connect Spectrum Analyzer THIRD LO OUTPUT to Tracking Generator THIRD LO INPUT g Connect Tracking Generator RF OUTPUT to Spectrum Analyzer RF INPUT h Connect Tracking Generator SCAN OUTPUT to Spectrum Analyzer SCAN IN OUT i Set Spectrum Analyzer controls as follows INTENSITY 12 o clock approx FREQUENCY 2 2 30 MHz 300 2 SCAN WIDTH esee PER DIVISION SCAN WIDTH PER DIVISION 200 kHz INPUT ATTENUATION
42. at t ADAIMP2 connector and measure frontto hack ratio Typically 70 to 200 000 ohms Replacement of components other than diode ASA1CR1 is not recommended Replace diode and perform First Converter Adjustment procedures in paragraph 5 11 If diode replacement does not correct malfunction replace mixer A5A1 See Figure 8 18 for First Converter Assembly Illustrated Parts Breakdown 155 OSCILLATOR ASSEMBLY A7 Field repair of the oscillator assembly is not recommended Component lead lengths are critical If components are replaced in the field note installation 1 ATI Tracking Generator Troubleshooting Block Diagram SERVICE SHEET 2 8 14 Service TM 11 6625 286614 amp P TM 11 6625 2866 14 amp P SERVICE SHEET 3 cont d of component to be replaced and install new component in identical manner When either assembly or components are replaced perform oscillator adjustment procedure paragraph 5 9 See Figure 8 19 for illustrated breakdown 1 55 GHz OSCILLATOR DRIVER See paragraph 8 30 for operational amplifier troubleshooting procedure To isolate the operational amplifier from the output amplifier A2Q8 remove the right side panel and disconnect the 91 wire from A7C2 and connect jumper between A2TPS and the junction of A2R32 and pin 6 of Adjust TRACK ADJ control fully counterclockwise Compare voltage at AQUI pin 2 with voltage at pin 3 The voltage leve
43. for use by accessory equipment Note See Table 14 for HP part numbers of interconnecting power cords Line power module 115 230V 48 440 Hz 5 Line input Connects to external ac power source Supplies ac power to ACCESSORY OUTLET when connected to external power source 115 230V Switch Line voltage slide switch controls power supply input connections Check that switch is set for nominal voltage of ac line To change setting remove power cord from line input 5 slide protective cover aside extract fuse with FUSE PULL 7 and slide switch to desired position Replace fuse with a fuse of the value indicated for the desired switch position Fuse extractor and switch lock Prevents line switch from being actuated until fuse is extracted Line input fuse Rating of fuse to be used is marked near line voltage slide switch setting corresponding to nominal ac supply voltage Figure 3 2 Model 8444A Tracking Generator Rear Panel Controls and Connectors 3 3 Model 8444A E 844 TRACKING 15 1500 1 2 DISPLAY SECTION E TM 11 6625 2866 14 amp P Operation Figure 3 8 Tracking Generator Operation with 8554B Spectrum Analyzer 1 of 2 3 4 Model 8444A TM 11 6625 2866 14 amp P Operation OPERATING PROCEDURE WITH AN 8554B 1 Check that the 115 230V switch is set to correspond LOG RERILEVEL O dBm with the available li
44. mVde perform adjustment procedu paragraph 5 12 and 5 13 and repeat measurement procedures above REMOVAL AND REPLACEMENT PROCEDURES See wiring detail for Amplifier and Detector Assembly Microct with serial numbers below 00100 have wires 98 and 958 reversed units with serial numbers above 00101 Connect assembly accordit wiring detail and serial number Replacement assemblies are shipped ground clips installed on the rf diode and reference diode pins Remove from the replacement assembly and install on unit being returned for r A2 4 5 First Converter Circuits Schematic Diagram SERVICE SHEET 3 ATE 273 4 GHz FILTER FLL ISOLATOR EQUIVALENT AD ios p d ex FIRSTLOY T 241 INPUT 252 WO FERST CONVERTER OUTPUT 2 05 3 a ILLI REFERENCE DESIGHATIONS WITKIN OUTLINED m ASSEMBLIES ABE ABBREVIATED FULL DESIGNATION CLUDES ASSEMBLY NUMBER RI ASSEMBLY Al 18 AURI DESIGNATIONS OF QTMER COMPONENTS ARE COMPLETE 5 SHOWN NOTES 1 SEE SCHEMATIC DIAGRAM NOTES TABLE 8 3 2 SEE DETAIL FOR INTERCONNECT WIRING REFERENCE DESIGNATIONS al CHASSIS we dd ya SEALED ASS Figure 8 15 Figure 8 14 A2 Modulator Oscillator Driver Assy Component Location 8 17
45. 0 5950 00 430 6904 9100 2254 28480 5950 00 008 4471 Change 1 6 11 6 12 blank 11 6625 2866 14 amp Model 8444A Manual Changes SECTION VII MANUAL CHANGES 7 1 INTRODUCTION Perform these changes in the sequence listed 7 2 This section contains information for adapting 7 4 f your instrument serial number is not listed on this manual to instruments for which the content does the title page of this manual or in Table 7 1 below it not apply directly may be documented in a yellow MANUAL CHANGES supplement For additional important information about 7 3 To adapt this manual to your instrument refer serial number coverage refer INSTRUMENTS to Table 7 1 and make all of the manualchanges listed COVERED BY MANUAL in Section T opposite your instrument serial number Table 7 1 Manual Changes by Serial Number Serial Prefix or No Make Manual Changes 1215A A 1208A B 1147A 7 5 MANUAL CHANGE INSTRUCTIONS CHANGE A Table 1 1 Change Nonharmonic Spurious Signals under Spectral Purity to gt 40 dB below output level Paragraph 4 20 Change Nonharmonic Spurious Signals in Specification to read gt 40 dB below output level Paragraph 4 20 Step 12 Change spurious to 40 dBm Page 4 16 Table 4 1 Change 35 to 40 for paragraph 4 20 Spurious Signal Level CHANGE B Table 1 1 change Spectral Purity Harmonic Distortion specification to read Harmonic Distortion 25 dB belo
46. 0 8 0 9 volt when collector current is high 8 26 Part A shows simplified versions of the three basic transistor circuits and gives the characteristics of each When examining a transistor stage first determine if the emitter base junction is biased for conduction forward biased by measuring the voltage difference between emitter and base When using an electronic voltmeter do V COMMON BASE COMMON EMITTER COMMON CHARACTERISTIC COLLECTOR Input Impedance 309 50Q Output Impedance 300K2 900KOQ 30KQ 50KQ Voltage Gain 500 1500 300 1000 Current Gain l 25 50 Power Gain 2008 3048 2598 40dB Emitter Follower 500 15009 20K2 500 7500 Q 10009 TM 11 6625 2866 14 amp P Service not measure directly between emitter and base there may be sufficient loop current between the voltmeter leads to damage the transistor Instead measure each voltage separately with respect to a common point e g chassis If the emitter base junction is forward biased check for amplifier action by short circuiting base to emitter while observing collector voltage The short circuit eliminates base emitter bias and should cause the transistor to stop conducting cut off Collector voltage should then change and approach the supply voltage Any difference is due to leakage current through the transistor and in general the smaller this current the better the transistor If the collector voltage doe
47. 0 dB tuning range of the front panel LEVEL control The level control circuitry provides the voltage level to the reference diode in the ALC detector Perform Automatic Level Control Check and Adjustment paragraph 512 before calibrating the level control COTNPUT THERMI STER POWER METER MOUNT EQUIPMENT Spectrum Analyzer HP 8555A 8552B 141T Power Meter 0 0 anneanne nsns nnns 432 Thermistor Mount icones Rhe HP 8478B PROCEDURE 1 Connect test setup as indicated if Figure 5 8 and set controls as follows Spectrum Analyzer BAND EIE DI EE M 1 2 05 GHz IF Iu cocos ntum EMILE aL LI E LUE 30 MHz EIA D MAMMA 100 kHz acc UP D aD RE ZERO INPUT ATTENUATION 20 dB TUNING STABILIZER ON SIBNAETDENTIFIER OFF BASE LINE CLIPPER CCW SCAN TIME PER DIVISION c csssssescssscsssocescsscceesstesercucsenenenstenseessneecrssensess 10 MILLISECONDS I I ne rah ei 10 dBm LOG 11 6625 2866 14 amp P Model 8444A Adjustments ADJUSTMENTS 5 13 Level Control Calibration Check and Adjustment cont d VIDEO FILTER rene rte e tene tratte betta OFF SCAN MODE ttt hebt etr riter INT SCAN TRIGGER etit
48. 00 165 0403 2100 2730 28480 5905 00 532 2926 131 149 02660 5999 00 479 8176 2110 0012 28480 5920 00 898 0400 131 150 02660 5935 00 434 3040 2110 0201 28480 5920 00 280 9534 133 32 10 013 71785 5935 00 885 8598 2110 0269 28480 5999 00 333 9620 1400 0011 28480 5999 00 999 6875 1490 0030 28480 6625 00 760 9521 2140 0244 28480 6240 00 951 3376 1820 0223 28480 5962 00 614 5251 251 15 30 261 71785 5935 00 867 0119 1853 0020 28480 5961 00 904 2540 3101 1248 28480 5930 00 476 9679 1854 0063 28480 5961 00 985 9074 3101 1395 28480 5930 00 164 0850 1854 0071 28480 5961 00 137 4608 50 045 4610 98291 5935 00 428 2944 1854 0221 28480 5961 00 836 1887 50 051 0109 98291 5935 00 858 8794 1854 0292 28480 5961 00 476 5731 50 085 0000 98291 5985 00 972 3149 1854 0345 28480 5961 00 401 0507 5000 0050 28480 6625 01 014 8071 1854 0404 28480 5961 00 408 9807 5040 0170 28480 6625 00 911 7214 1901 0040 28480 5961 00 965 5917 5040 0306 28480 5970 00 470 7622 1901 0159 28480 5961 00 496 7363 5060 0767 28480 6625 00 903 0348 1901 0200 28480 5961 00 994 0520 5060 1189 28480 6625 00 434 3251 1901 0633 28480 5961 00 408 9813 8120 1348 28480 6150 01 004 8773 1901 0639 28480 5961 00 787 3394 Change 10 6 10 11 6625 2866 14 amp P TABLE 6 4 PART NUMBER NATIONAL STOCK NUMBER CROSS REFERENCE INDEX NATIONAL NATIONAL PART STOCK PART STOCK FSCM FSCM 91 6915 1500 00 95354 5935 00 972 9464 9100 2252 2848
49. 0118 1 CONNECTOR BNG 24931 28JR 128 1 J6 1251 2996 1 CONNECTOR AC POWER 28480 1251 2996 Q1 1854 0063 2 TSTR SI NPN 80131 2N3055 Q1 1200 0043 2 INSULATOR TSTR MOUNTING TO 3 71785 293011 02 1854 0063 TSTR SI NPN 80131 2N3055 2 1200 0043 INSULATOR TSTR MOUNTING TO 3 71785 293011 R1 2100 2730 1 R VAR CERMET 5000 OHM 20 LIN 2W 28480 2100 2730 R1 0370 0133 3 KNOB SKIRTED FOR 0 250 DIA SHAFT 28480 0370 0133 R2 2100 2886 1 R VAR WW 5K OHM 5 LIN 2W 28480 2100 2886 R2 0370 0133 KNOB SKIRTED FOR 0 250 DIA SHAFT 28480 0370 0133 2100 2728 1 R VAR CERNET 1K OHM 20 LIN 2W 28480 2100 2728 0370 0133 KNOB SKIRTED FOR 0 250 DIA SHAFT 28480 0370 0133 R4 0698 3449 1 R FXD MET FLM 28 7K OHM 196 1 8W 28480 0698 3449 R5 0757 3438 1 R FXD MET FLM 5 11 OHM 1 1 8W 28080 0757 0438 1 3101 1248 1 SWITCH PUSHBUTTON SPDT ILLUMINATED 87034 53 55480 121 A1H 1DS1 2140 0244 1 LAMP GLOW MINIATURE 95V 87034 A1H 1 08444 20018 1 CABLE ASSY FIRST LO INPUT 28480 08444 20018 2 08444 20024 2 CABLE ASSY FILTER 28480 08444 20024 3 08444 20024 CABLE ASSY FILTER 28480 08444 20024 4 08444 20020 1 CABLE ASSY MIXER ISOLATOR 28480 08444 20020 5 08444 60015 1 CABLE ASSY THIRD LO INPUT 28480 08444 60015 W6 08444 60014 1 CABLE ASSY FIRST CONVERTER 28480 08444 60014 7 08444 20017 1 CABLE ASSY OSCILLATOR 28480 08444 20017 8 08444 20026 1 CABLE ASSY FIRST ISOLATOR 28480 08444 20026 9 09444 20027 1 CABLE ASSY FIRST C OUTPUT 28480 08444 20027 10 08444 20021 1 CABLE ASS MIXER CIRCUIT
50. 0160 3861 1 C FXD 18 PF 5 250 VDCW 72982 2930 000 3903 A5A1C3 0160 3860 1 C FXD MICA 39 PF 5 250VDCW 72982 2930 000 390J ASA1CR1 1901 0633 1 DIODE HOT CARRIER 28480 1901 0633 A5A1J1 1250 0829 50 SCREW ON TYPE 98291 50 045 4610 ASA1L1 9100 2254 1 COIL CHOKE 39 UH 1096 28480 9100 2254 ASA1MP1 0520 0128 4 SCREW PAN HD POZI DR 2 56 X 0 250 LG 00000 OBD 1 2 1251 1556 1 CONNECTOR SINGLE CONTACT 00779 2 330808 8 ASA1MP3 08555 00031 1 LID RESONATOR HOUSING 28480 08555 00031 4 085 5 20036 1 RESONATOR HOUSING 28480 08555 20016 5 1 1 0698 7233 1 FLM 750 OHM 2 1 8W 28480 0698 7233 A6 08444 60004 1 MIXER ASSY OUTPUT 28480 08444 60004 A6 NOT RECOMMENDEOD FOR FIELD REPAIR A7 08444 60019 1 OSCILLATOR ASSY 1 55 GHZ A7 NOT RECOMMENDED FOR FIELD REPAIR 28480 08444 60019 A7CI 0163 3827 1 PRC 1 PF 500VDCW 84411 663UW22354W2 A7C2 0160 0345 2 C FXD FEED THRU 1000 PF 500VDCW 01121 FB2B 102W A7C3 0160 0345 C FXD CER FEED THRU 1000 PP 500VDCW 01121 FB28 102W 7 4 0160 2437 1 FXD CER 5000 80 20 A7CR1 0122 0245 2 C VOLTAGE VAR 6 8 PF 10 60VDCW 04713 1N5139 A7J1 1250 0829 5 OHM SCREW ON TYPE 98291 50 045 4610 A7L1 1460 0103 1 SPRING COMPRESSION 0 120 OD 00000 O8D A7Q1 1854 0292 1 TSTR SI NPN 28480 1854 0292 A7R1 0698 7230 1 R FXD FLM 562 OHM 2 1 8 W 28480 0698 7230 A7R2 0757 0418 1 R FXD MET FLM 619 OHM 1 1 8W 28480 0757 0418 A8 5060 1189 POWER
51. 0698 0083 28480 5905 00 407 0052 0757 0442 28480 5905 00 998 1792 0698 0084 28480 5905 00 974 6073 0757 0465 28480 5905 00 904 4412 0698 3151 28480 5905 00 246 8634 0757 0817 28480 5905 00 909 1778 0698 3154 28480 5905 00 891 4215 0757 1094 28480 5905 00 917 0580 0698 3155 28480 5905 00 976 3418 0811 1666 28480 5905 00 402 7082 0698 3156 28480 5905 00 974 6084 08554 00007 28480 5950 00 774 7261 Change 1 6 9 11 6625 2866 14 amp P TABLE 6 4 PART NUMBER NATIONAL STOCK NUMBER CROSS REFERENCE INDEX NATIONAL NATIONAL PART STOCK PART STOCK NUMBER FSCM NUMBER NUMBER FSCM NUMBER 08555 20093 28480 5999 00 008 8444 1902 3182 28480 5961 00 229 1966 0960 0084 28480 5985 00 787 2899 1902 3256 28480 5961 00 412 0957 134998 02735 5961 00 994 0520 2 330808 8 00779 5935 00 965 9612 1N5139 04713 5961 00 499 7905 2N2904A 80131 5961 00 913 5195 11593A 28480 5905 00 890 3393 2N3053 80131 5961 00 985 9073 1200 0041 28480 5935 00 971 9712 2N3055 80131 5961 00 985 9074 1200 0043 28480 5970 00 805 7166 2N3528 02735 5961 00 945 3380 1250 0118 28480 5935 00 897 9351 2N5179 80131 5961 00 401 0507 1250 0829 28480 5935 00 428 2944 2100 1758 28480 5905 00 228 5989 1250 0838 28480 5985 00 972 3149 2100 1760 28480 5905 00 229 1971 1250 0914 28480 5935 00 434 3040 2100 1775 28480 5905 00 228 5990 1251 0135 28480 5935 00 972 9464 2100 2522 28480 5905 00 476 5797 1251 0159 28480 5935 00 867 0119 2100 2728 28480 5905 00 161 9093 1251 1556 28480 5999
52. 2 The 115 230 power selector switch on the rear panel line power module must be set to agree with the available line voltage The selector switch is located below the fuse holder and fuse extractor lever arrow on the selector switch points to callouts listing the line input voltage and fuse amperage rating To change the position of the selector switch it is necessary to remove the power cable slide the protective cover to the left and lift the fuse extractor before the switch can be changed With the fuse extractor extended press down and toward the desired direction Replace fuse with a fuse of the amperage rating for the selected position See Section for replacement HP Part Numbers The instrument is normally shipped with fuse installed for 115 volt operation 2 13 Power Cable 2 14 protect operating personnel the National Electrical Manufacturers Association NEMA and the International Electrotechnical Commission IEC recommends that the instrument panel and cabinet be grounded The Tracking Generator is equipped with a three conductor power cable the third conductor is the ground conductor and when the cable is plugged into an appropriate receptacle the instrument is grounded To preserve the protection feature when operating the instrument from a two contact outlet use a three prong to two prong adapter and connect the green or green yellow lead on the adapter to ground 2 15 Power cables are selected for
53. 25 2866 14 amp P Service Table 8 3 Schematic Diagram Notes SCHEMATIC DIAGRAM NOTES Refer to USAS Y 32 2 1967 Resistance is in ohms capacitance is in microfarads and inductance in millihenries unless otherwise noted Part of Asterisk denotes a factory selected value Value shown is typical Capacitors may be omitted or resistors jumpered Screwdriver adjustment Panel control Encloses front panel designations Encloses rear panel designations Circuit assembly borderline Other assembly borderline Heavy line with arrows indicates path and direction of main signal Heavy dashed line with arrows indicates path and direction of main feedback Wiper moves toward CW with clockwise rotation of control as viewed from shaft or knob Numbered test point Measurement aid provided Lettered test point No measurement aid provided Encloses wire color code Code used MIL STD 681 is the same as the resistor color code First number identifies the base color second number the wider stripe and the third number identifies the narrower stripe e g denotes white base yellow wide stripe violet narrow stripe Indicates WARNING HAZARDOUS VOLTAGE Refers serviceman or operator to CAUTIONs in Operating and Service Manual Letter page connection Number Service Sheet location for off page connection Block numbers reference between text and schematic Assembly ground Chassis ground Model 8444A CAU
54. 3 Panel Features 3 1 Replaceable Parts List 6 1 Operator s Checks Ordering Information 6 1 Operating Instructions 3 1 Controls Indicators and Connectors VIL MANUAL 7 1 Operating Techniques Introduction 7 1 3 13 Crystal Filter Measurement 3 8 Manual Change Instructions 7 1 Bandpass Filter Measurement Low Pass Filter Measurement 3 8 SERVICE 8 1 3 19 Swept Return Loss Measurement 3 9 1 EPIO 8 1 Amplifier Gain and Bandwidth 8 3 Principles of Operation 8 1 3 9 Recommended Test Equipment 8 1 3 23 Precision Frequency Measurements 3 9 Troubleshooting 8 1 8 1 PERFORMANCE TESTS 1 4 1 8 20 General Service Hints 1 8 2 introduction ERI 4 1 8 23 General Service Information 8 4 Equipment Required 4 1 operational Amplifiers Front Panel 4 1 Electrical Maintenance 8 6 Preset Adjustments 8554B 8552B TM 11 6625 2866 14 amp P LIST OF ILLUSTRATIONS Contents Figure
55. 3441 A1R6 0157 0440 R FXD MET FLM 7 50K OHM 1 1 8W 28480 0757 0440 A1R7 0757 0280 5 R FXD FLM 1K OHM 1 1 8W 28480 0757 0280 A1R8 0757 0401 3 R FXD MET FLM 100 OHM 1 1 8W 28480 0757 0401 1AR9 0757 0438 3 R FXD MET FLM 5 11K OHM 196 1 8W 28480 0757 0438 A1R10 0683 0275 2 R FXD COMP 2 7 OHM 52 1 4W 01121 2765 1 11 0757 0280 R FXD FLM LK OHM 1 1 8W 28480 0757 0280 ALR12 0757 0278 1 R FXD MET FLM 1 78K OHM 1 1 8W 28480 0757 0278 A1R13 0757 0289 1 R FXD MET FLM 13 3K OHM 3 1 81W 28480 0757 0289 A1R14 2100 1758 3 R VAR WW 1K OHM 53 TYPE V 1W 28480 2100 1758 A1R15 0757 0200 1 R FXO MET FLM 5 62K OHM 1 1 8W 28480 0757 0200 A1RL16 0811 1666 R FXD WW 1 0 OHM 5 2W 28480 0811 1666 A1R17 0698 3441 R FXD MET FLM 215 OHM 1 1 8W 28480 0698 3441 A1R18 0757 0440 R FXD MET FLM 7 50K OHM 1 1 8W 28480 0757 0440 1AR19 0757 0280 R FXD MET FLM 1K OHM 1 1 8W 28480 0757 0280 A1R20 0757 0440 R FXD MET FLM 7 50K OHM 1 1 8W 28480 0757 0440 A1R21 0698 0084 3 R FXD MET ELM 2 15K OHM 1 1 8W 28480 0698 0084 A1R23 0698 0084 R FXD MET FLM 2 15K OHM 1 1 8W 28480 0698 0084 A1R22 0698 0084 R FXD MET FLM 2 15K OHM 1 1 8W 28480 0698 0084 A1R24 0683 0275 R FXD COMP 2 7 OHM 5 1 4W 01121 CB 27G5 A1TB1 08444 20001 1 BOARD BLANK PC 28480 08444 20001 A1TP1 0360 1514 12 TERMINAL PIN SQUARE 28480 0360 1514 A1TP2 0360 1514 TERMINAL PIN SQUARE 28480 0360 1514 A1TP3 0360 1514 TERMINAL PIN SQUARE 28480 0360 1514 A1TP4 0360 1514 TERMINAL PIN SOU
56. 3443A Plug in HP 3440A Power 6205 Test Leads dual banana plug to probe and alligator clip HP 11003A Cable Assy SMA male to HP 08555 60076 Cable Assy male HP 10503A Coaxial Attenuator Option 010 HP 8491A Adapter BNC barrel HP Part Number 1250 0080 UG 914A U Adapter to UG 201A U PROCEDURE 1 Perform Power Supply Check and Adjustment paragraph 5 8 2 Apply power to Tracking Generator and allow 1 hour for instrument to warm up and stabilize 3 Disconnect Cable W8 at Isolator J2 see Figures 8 4 and 8 12 4 With test setup as indicated in Figure 5 2 connect Power Meter to Isolator AT3 J2 via 08555 60076 cable 10 dB attenuator and UG 914A U adapter Rotate TRACK ADJ control throughout its tuning range while noting power level indicated on Power Meter e 7 2 Model 8444A 5 9 6 20 21 22 23 24 TM 11 6625 2866 14 amp P Manual Changes 1 55 GHz Oscillator Power Level Frequency Check and Adjustment cont d Record minimum power output gt 5 dBm Connect Frequency Counter to Isolator AT3 J2 via 08555 60076 cable UG 914A 1J adapter and BNC to BNC cable Rotate TRACK ADJ control fully counterclockwise and re
57. 4 and provides instructions for operation and maintenance 0 2 INDEXES OF PUBLICATIONS a DA Pam 310 4 Refer to the latest issue of DA Pam 310 4 to determine whether there are new editions changes or additional publications pertaining to the equipment b DA Pam 310 7 Refer to DA Pam 310 7 to determine whether there are modification work orders MWO s pertaining to the equipment 0 3 MAINTENANCE FORMS RECORDS AND REPORTS a Reports of Maintenance and Unsatisfactory Equipment Department of the Army forms and procedures used for equipment maintenance will be those described by TM 38 750 The Army Maintenance Management System b Report of Packaging and Handling Deficiencies Fill out and forward DD Form 6 Packaging Improvement Report as prescribed in AR 700 58 NAVSUPINST 4030 29 AFR 71 13 P4030 29A 4145 8 Discrepancy in Shipment Report DISREP SF 361 Fill out and forward Discrepancy in Shipment Report DISREP SF 361 as prescribed in AR 55 38 NAVSUPINST 4610 33B AFR 75 18 MCO P4610 19C and DLAR 4500 15 0 4 REPORTING EQUIPMENT IMPROVEMENT RECOMMENDATIONS EIR EIR can and must be submitted by anyone who is aware of an unsatisfactory condition with the equipment design or use It is not necessary to show new design or list a better way to perform a procedure just simply tell why the design is unfavorable or why a procedure is difficult EIR may be submitted on SF 368
58. 4 1 6 0698 7236 R FXD FLM 1K OHM 2 1 8W 28480 0698 7236 4 1 7 0698 7236 R FXD FLM 1K OHM 2 1 8W 28480 0698 7236 A4A1R8 0698 7236 R FXD FLM 1K OHM 2 1 8W 28480 0698 7236 4 1 9 0698 7236 R FXD FLM 1K OHM 2 1 8W 28480 0698 7236 4 1 10 0698 7236 R FXD FLM 1K OHM 22 1 8W 28480 0698 7236 A4A1R11 0693 7214 1 R FXD FLM 121 OHM 2 1 8W 28480 0698 7214 A4A1TB1 08444 20005 1 BOARD BLANK PC 28480 08444 20005 A5 08444 60011 1 CONVERTER ASSY FIRST 28480 08444 60011 1250 0829 5 50 OHM SCREW ON 98291 50 045 4610 A5J2 1250 0829 CONNECTOR KF 50 OHM SCREW ON TYPE 98291 50 045 4610 A5J3 1250 0829 50 OHM SCREW ON 98291 50 045 4610 1 08555 00033 2 INPUT OUTPUT LOOP 28480 08555 00033 2 0516 0005 2 SCREW PAN HD SLOT DR 0 80 X 0 188 LG 00000 080 2200 0111 14 SCREW PAN HD DR 4 40 X 0 500 LG 00000 OBD 08555 20035 1 CAVITY BLOCK SECOND CONVERTER 28480 08555 20035 5 08444 20012 1 COVER FIRST CONVERTER 28480 08444 20012 ASMP6 2200 0172 2 SCREW FLAT HD POZI DR 4 40 X 0 875 LG 00000 OBD A5MP7 08444 20007 1 CENTER POST 28480 08444 20007 5 8 2740 0001 3 NUT HEX 10 32 THREAD 00000 O8D 9 3030 0151 4 SCREW SOCKET 4 40 THREAD 28480 3030 0151 ASMP10 3030 0397 3 SCREW SET 10 32 UNF 2A THREAD 00000 OBD 08444 60012 1 MIXER ASSY FIRST 28480 08444 60012 ASA1C1 0160 2327 1 C FXO CER 1000 PF 20 100VDCW 96733 B104BX102M A5A1C2
59. 40 0156 6625 00 431 9339 6625 00 937 3525 6625 00 424 4370 6625 00 432 5055 6625 00 431 9339 6625 01 033 5050 6625 01 015 4412 6625 00 405 6608 6625 00 969 4105 6625 00 498 8946 6625 01 007 4796 6625 00 003 3238 6625 00 126 5708 6625 00 542 1292 6625 00 022 7894 5950 00 235 2086 6625 00 437 4861 5180 00 605 0079 5 TOOL NUMBER COMMON TOOLS NECESSARY TO THE PERFORMANCE OF THIS MAINTENANCE FUNCTION ARE AVAILABLE TO MAINTEN ANCE CATEGORY LISTED Change 1 H 4 NCE PERSONNEL FOR THE MAINTEN 11 6625 2866 14 amp P SECTION IV REMARKS GENERATOR TRACKING SG 1125 U VISUAL REPAIR BY REPLACEMENT OF DIODE ASA1CR1 0 5 GOVERNMENT PRINTING OFFICE 1980 765 016 1104 H 5 H 6 blank TM 11 6625 2866 14 amp P APPENDIX I REPAIR PARTS AND SPECIAL TOOLS LIST Refer to Section Replaceable Parts for all maintenance parts l 1 RECOMMENDED CHANGES TO EQUIPMENT TECHNICAL PUBLICATIONS SOMETHING WRONG wire ms FROM PRINT YOUR UNIT S COMPLETE ADDRESS THEN JOT DOWN THE DOPE ABOUT IT ON THIS FORM CAREFULLY TEAR IT OUT FOLD IT AND DROP IT IN THE MAIL PUBLICATION NUMBER PUBLICATION DATE BE EXACT PIN POINT WHERE IS 2028 2 PREVIOUS EDITIONS P S IF YOUR OUTFIT WANTS KNOW ABOUT YOUR autre RECOMMENDATION CARBON COPY OF THIS AND GIVE IT TO YOUR HEADQUARTERS I
60. 4205 through Q7 on the schematic diagram Troubleshoot the differential amplifier A1Q1 through A2Q3 and limiter A2Q4 using the typical voltage levels given on the schematic diagram When malfunction has been perform adjustment procedures in paragraphs 5 12 and 5 13 See Figure 8 9 for diode forming instructions B FIRST CONVERTER ASSEMBLY When malfunction has been isolated to the first converter remove lid ASALMP see illustrated parts breakdown Figure 8 18 With the 1 55 GHz oscillator signal applied to A5J2 measure mixer bias at test point inductor A3A1L2 Bias level should be greater than 1 2 Vde Polarity can be either positive or negative depending on the direction on diode ASAICRI If diode bias is low check tuning of ADJ 1 check for tightness Of screws securing cover ASMP5 to cavity block A5MP4 and check for tightness of screws securing the mixer block to the cavity block cover Monitor bias leve during adjustments for indication of fault If there is no or very low bias voltage remove power from instrument and check diode front to back ratio Use test point ASAITP A and chassis ground for measurement points Check for a typical front to back ratio of 70 to 700 ohms using HP 4124 VTVM with diode in parallel with A4AIRI For actual diode front to back measurement remove the four cap screws and lift the mixer assembly from the cavity block cover Lift the diode
61. 56 C FXD CER 1000 PF 10 250 VDCW 28480 0160 3456 A4A1C3 0160 2266 C FXD 24 5 500VDCW 72982 301 000 COGO 240J 4 1 4 0160 2266 C FXD CER 24 51 500VDCW 72982 301 000 COGO 240J 4 1 5 0160 2266 C FXD CER 24 5 500VDCW 72982 301 000 COGO 240J 4 1 6 0160 2266 C FXD 24 5 500VDCW 72982 301 000 COGO 240J A4A1C7 0160 2266 C FXO CER 24 PF 5 500VDCW 72982 301 000 COGO 240J 4 1 0160 2266 C FXD CER 24 500VDCW 72982 301 000 COGO 240J 4 1 9 0160 2266 C FXD CER 24 500VDCW 72982 301 000 COGO 240J A4A1C10 0160 2266 C FXD CER 24 PF 500VDCW 72982 301 000 COGO 240J A4A1C11 0160 2266 C FXD CER 24 PF 500VDCW 72982 301 000 CG000 240J 1 1901 0639 2 DIOOE PIN 1 1GHZ 28480 1901 0639 A4A1CR2 1901 0639 DIODE PIN 1MHZ TO 1GHZ 28480 1901 0639 AAA1LT 9100 2252 4 COIL CHOKE 0 27 UH 10 28480 9100 2252 44112 9100 2252 COIL CHOKE 0 27 UH 10 28480 9100 2252 A4A1L3 9100 2252 COIL CHOKE 0 27 UH 10 28480 9100 2252 4 114 9100 2252 COIL CHOKE 0 27 UH 10 28480 9100 2252 A4A1Q1 1854 0345 3 TSTR SI NPN 80131 2N5179 A4A1Q2 1854 0345 TSTR SI NPN 80131 2N5179 A4A1Q3 1854 0345 TSTR SI NPN 80131 2N5179 A4A1R1 0698 7197 1 R FXD FLM 23 7 OHM 2 1 8W 28480 0698 7197 A4ATR2 0698 7236 9 R FXD FLM 1K OHM 2 1 8W 28480 0698 7236 A4ATR3 0698 7236 R FXD FLM 1K OHM 2 1 8W 28480 0698 7236 0698 7236 R FXD FLM IK OHM 2 1 8W 28480 0698 7236 185 0698 7236 R FXD FLM 1K OHM 2 1 8W 28480 0698 7236
62. 6 In addition to the accessories supplied with the Tracking Generator a Spectrum Analyzer System is required to complete the Tracking Generator Spectrum Analyzer System The Tracking Generator is compatible with either the 8554B 8552 140 series Spectrum Analyzer System or the 8555A 8552 140 series Spectrum Analyzer System Refer paragraph for modifications to early model Spectrum Analyzer Systems For precision frequency measurements a frequency counter is required for use with the Tracking Generator Spectrum Analyzer System Operating accessories are listed in Table 1 4 1 27 WARRANTY 1 28 The Hewlett Packard Model 8444A Tracking Generator is warranted and certified as indicated on the inner front cover of this manual For further information contact the nearest Hewlett Packard Sales and Service office addresses are provided at the back of this manual 1 29 RECOMMENDED TEST EQUIPMENT 1 30 Table 1 3 lists the test equipment and accessories required to check adjust and repair the Tracking Generator If substitute equipment is used it must meet the Minimum Specifications listed in Table 1 3 Table 1 2 Accessories Supplied HP Part Number 8120 1348 Line Power Cable 08444 60017 Interconnect Cable 08444 60018 Interconnect Cable paragraph 2 15 and Figure 2 1 Description 71 feet 3 wire AC Line Cord Coaxial cable for interconnection between AUX A connector on Display Section and THIRD LO
63. 8 28480 5905 00 974 6080 0121 0414 28480 5910 00 402 1910 0698 3441 28480 5905 00 974 6076 0160 0155 28480 5910 00 719 4370 0698 3444 28480 5905 00 974 6079 0160 0300 28480 5910 00 058 7916 0698 3445 28480 5905 00 493 4289 0160 0345 28480 5910 00 803 4398 0698 3447 28480 5905 00 828 0404 0160 2055 28480 5910 00 211 1611 0698 3449 28480 5905 00 828 0397 0160 2152 28480 5910 00 410 9365 0698 3450 28480 5905 00 826 3262 0160 2199 28480 5910 00 244 7164 0698 3454 28480 5905 00 974 6077 0160 2208 28480 5910 00 430 5685 0698 7200 28480 5905 00 161 8936 0160 2266 28480 5910 00 430 5754 0698 7233 28480 5905 00 160 5437 0160 2327 28480 5910 00 244 7171 0757 0200 28480 5905 00 891 4224 0160 2357 28480 5910 00 451 3194 0757 0278 28480 5905 00 110 0851 0160 2437 28480 5910 00 431 3956 0757 0280 28480 5905 00 853 8190 0160 3456 28480 5910 01 014 2874 0757 0288 28480 5905 00 193 4318 0160 3460 28480 5910 00 008 4458 0757 0289 28480 5905 00 998 1908 0180 0049 28480 5910 00 781 9398 0757 0346 28480 5905 00 998 1906 0180 0116 28480 5910 00 809 4701 0757 0401 28480 5905 00 981 7529 0180 0228 28480 5910 00 719 9907 0757 0416 28480 5905 00 998 1795 0180 0374 28480 5910 00 931 7050 0757 0418 28480 5905 00 412 4037 0180 1746 28480 5910 00 430 6036 0757 0421 28480 5905 00 891 4219 0360 1514 28480 5940 00 150 4513 0757 0424 28480 5905 00 493 0736 0370 0133 28480 5355 00 917 1039 0757 0438 28480 5905 00 929 2529 0698 0082 28480 5905 00 974 6075 0757 0439 28480 5905 00 990 0303
64. 866 14 amp P Operation 9 Note point of interest on CRT display h Set Spectrum Analyzer SCAN MODE to EXT and rotate Tracking Generator MANUAL SCAN control clockwise to point of interest i Note and record frequency j Set Spectrum Analyzer SCAN MODE to INT Note The CRT trace dot can be moved either direction by the Tracking Generator MANUAL SCAN control For best frequency accuracy approach frequency measurement point while tuning the MANUAL SCAN control in the clockwise direction Figure 3 10 Precision Frequency Measurement CRT Display Model 8444A TM 11 6625 2866 14 amp P Performance Tests SECTION IV PERFORMANCE TESTS 4 1 INTRODUCTION 4 2 This section contains preset adjustment procedures and performance tests for the Model 8444A Tracking Generator and Model 8554L or 8555A 8552B 141T Spectrum Analyzer System Preset adjustments for the 8444A 8554B 8552B 141T system given Preset adjustments for the 8444A 8555A 8552B 141T are given in Perform the preset adjustment procedures for the appropriate system prior to accomplishing the performance tests Procedures for verifying that the instruments meet specifications are given in paragraphs hrough 4 20 4 3 EQUIPMENT REQUIRED 4 4 Test equipment and accessories for performance P adjustment A and troubleshooting T are listed in Table 1 3 Critical specifications and or required features for the test equipment and accessories
65. ARE 28480 0360 1514 A1TP5 0360 1514 TERMINAL PIN SQUARE 28480 0360 1514 A1LT6 0360 1514 TERMINAL PIN SQUARE 28480 0360 1514 A1U1 1820 0223 3 INTEGRATED CIRCUIT OPERATIONAL AMPL 28480 1820 0223 A1U2 1820 0223 INTEGRATED CIRCUIT OPERATIONAL AMPL 28480 1820 0223 A2 08444 60002 1 BOARD ASSY DRIVER 28480 08444 60002 A2C1 0180 0116 C FXO ELECT 6 8 UF 10 35VDCW 56289 150D685X903582 DYS A2C2 0180 2205 1 C FXD ELECT 0 33 UF 10 35VDCW 56289 1500334X9035A2 DYS 6 4 11 6625 2866 14 amp Model 8444A Replaceable Parts Table 6 2 Heplaceable Parts Reference HP Part Number Qty Description Mfr Mfr Part Number Designation Code A2C3 0180 0228 C FXD ELECT 22 UF 10 15VDCW 56289 1500226X901582 DYS 2 4 0180 1746 1 C FXD ELECT 15 UF 10 20VDCW 28480 0180 1746 2 5 0180 0374 2 C FXD TANT 10 UF 10 20 DCW 56289 1500106X902082 DYS A2C6 0160 2208 1 C FXD MICA 330 PF 5 300VDCW 28480 0160 2208 A2C7 0180 0374 C FXD TANT 10 UF 10 20 DCW 56289 1500106X902082 DYS 2 8 0160 0300 1 C FXD MY 0 0027 UF 10 200VDCW 56289 292P27292 PTS A2CR1 1901 0040 DIODE SILICON 30WV 07263 FDG1088 A2CR2 1901 0040 DIOOE SILICON 30MA 30WV 07263 FDG1088 A2CR3 1901 0040 DIODE SILICON 30MA 30WV 07263 FDG1088 201 1854 0221 1 TSTR SI NPN REPL BY 24044 28480 1854 0221 A2Q2 1853 0020 TSTR SI PNP SELECTED FROM 2N3702 28480 1853 0020 203 1853 0020 TSTR SI PNP SELECTED FROM 233702 28480 1853 0020 204 1853 0020 TSTR SI
66. Bm by a front panel LEVEL control in the dc amplifier circuit The LEVEL ISOLATOR ISOLATOR O control is calibrated at 0 dBm Figure 7 7 contains a block diagram of the tracking generator with FILTER Pit 7 7 interconnections to both the 85541 and 8555 Spectrum Analyzer Systems The first LO inputis applied through isolators and a 2 0 to 3 4 GHz bandpass filter to the second converter The third LO input is applied through 4 500 RE DUTBUF MHz limiter amplifier and PIN diode modulators to the second converter 0 5 1300 1 55 GHz The 500 MHz third LO signal is combined with the output from the 1 55 MHz AMPL 1 3GHz CAVITY GHz cavity oscillator The output from the first converter has a center LOW PASS PAD OSCILLATOR frequency of 2 05 GHz with a tuning range of 2 MHz plus the deviation of FILTER the 500 MHz signal from the analyzer The 2 05 GHz first converter output ALC SECOND FIRST DETECTOR 4 CONVERTER CONVERTER O 0 TRACK ADJ gs AMPL TUNE 8555A SPECTRUM 103468 00 MHz 2 05 GHz 1 55 GHz is mixed with the 2 05 to 3 4 GHz output from the bandpass filter in the second converter The second converter output is applied through the 0 to 1 3 GHz low pass filter amplifier and ALC circuitry The resultant output is a signal in the frequency range o
67. CRT display for a 23 MHz low pass filter Filter characteristics 3 dB point at approximately 23 MHz 60 dB point at approximately 42 MHz a Spectrum Analyzer 8555A control settings FREQUENCY ttes 25 MHz SCAN WIDTH PER DIVISION 5 MHz BANDWIDTH 100 kHz INPUT ATTENUATION eem 10 dB SCAN TIME PER DIVISION 0 1 SECONDS eee te ee LOG LOG REF LEVEL eee 10 dBm LOG REF LEVEL Vernier 3 dB VIDEO FILTER 10Hz SCAN MODE nire ettet INT SCAN TRIGGER AUTO b Tracking Generator control settings irt eere ote Peak zu OdBm Model 8444A Figure 3 7 23 MHz Low Pass Filter CRT Display 3 19 Swept Return Loss Measurement 3 20 illustrates the CRT display for a wept return loss or reflection coefficient measurement directional bridge HP 8721 was used to separate the incident from the reflected signal The filter under test is the same 23 MHz Low Pass paragraph 3 18 Control settings same as paragraph 3 18 except analyzer adjusted so that the top graticule line represents 0 dB return loss or total reflection e g short or open circuit Return loss is greater than 15 dB 0 18 SWR 1 44 over the filter range of 0 to 23 MHz Figure 3 8 Swept Return Loss Measurement CH T Displa
68. D MET FLM 2 87K OHM 1 1 8W 28480 0698 3151 A2TB1 08444 20002 1 BOARD BLANK PC 28480 08444 20002 A2TP1 0360 1514 TERMINAL PIN SQUARE 28480 0360 1514 A2TP2 0360 1514 TERMINAL PIN SQUARE 28480 0360 1514 A2TP3 0360 1514 TERMINAL PIN SQUARE 28480 0360 1514 2 4 0360 1514 TERMINAL PIN SQUARE 28480 0360 1514 A2TP5 0360 1514 TERMINAL PIN SQUARE 28480 0360 1514 A2TP6 0360 1514 TERMINAL PIN SQUARE 28480 0360 1514 A2UI 1820 0223 INTEGRATED CIRCUIT OPERATIONAL AMPL 28480 1820 0223 A3 5086 7025 1 AMPLIFIER DETECTOR 28480 0960 2038 A3 NOT FIELD REPAIRABLE A4 AMPLIFIER ASSY 500 MHZ A4C1 0160 2357 2 CER FEED THRU 1000 PF 80 20 28480 0160 2357 A4C2 0160 2357 CER FEED THRU 1000 PF 80 20 28480 0160 2357 A4C3 0160 2152 1 C FXD CER 10 PF 20 500VDCW 28480 0160 2152 A4J1 1250 1220 2 CONNECTOR RF 50 OHM SCREW ON 98291 50 051 0109 A4J2 1250 1220 50 SCREW ON 98291 50 051 0109 6 5 11 6625 2866 14 amp Model 8444A Replaceable Parts Table 6 2 Heplaceable Parts Reference HP Part Number Qty Description Mfr Mfr Part Number Designation Code AAMP1 08444 00006 1 COVER 500 MHZ AMPLIFIER 28480 08444 00006 AAMH2 08444 20011 1 HOUSING 500 MHZ AMPLIFIER 28480 08444 20011 08444 60005 1 BOARD ASSY 500 MHZ AMPLIFIER 28480 08444 60005 A4A1C1 0160 2266 11 C FXD CER 24 PF 5 500VDCW 72982 301 000 COGO 240J A4A1C2 0160 34
69. ENTS provides information required to properly adjust and align the instrument after repairs are made SECTION REPLACEABLE PARTS provides ordering information for all replaceable parts and assemblies SECTION VII MANUAL CHANGES normally will contain no relevant information in the original issue of a manual This section is reserved to provide back dated and up dated information in manual revisions or reprints SECTION VIII SERVICE includes all information required to service the instrument 1 5 SAFETY CONSIDERATIONS 1 6 General 1 7 This is International Electrotechnical Commission Safety Class instrument This instrument has been designed and tested according to IEC 1 1 Publication 348 Safety Requirements for Electronic Measuring Apparatus and has been supplied in safe condition 1 8 Operation 1 9 BEFORE APPLYING POWER make sure the instrument s ac input is set for the available ac line voltage that the correct fuse is installed and that all normal safety precautions have been taken 1 10 Service 1 11 Although the instrument has been designed in accordance with international safety standards the information cautions and warnings in this manual must be followed to ensure safe operation and to keep the instrument safe Service and adjustments should be performed only by qualified service personnel 1 12 Adjustment or repair of the opened instrument with the ac power connected
70. H to ZERO and tune FINE TUNE for maximum signal amplitude 11 Disconnect Test Oscillator from Spectrum Analyzer and connect Tracking Generator OUTPUT to Spectrum Analyzer INPUT 12 Adjust Tracking Generator TRACK ADJ for maximum signal amplitude on CRT display 13 Connect Tracking Generator AUX RF OUTPUT to Frequency Counter Measure and record frequency 8554B 500 10 kHz 8555A10MHz 10kHz 14 Repeat steps 6 through 13 at selected frequencies using appropriate signal generator in place of test oscillator 4 12 TM 11 6625 2866 14 amp P Model 8444A Performance Tests PERFORMANCE TESTS 4 20 Harmonic Distortion SPECIFICATION Harmonic Distortion 25 dB below output level Nonharmonic spurious signals gt 40 dB below output level DESCRIPTION With the Tracking Generator and Spectrum Analyzer operating as a system the RF OUTPUT from the Tracking Generator is observed using a separate spectrum analyzer The output signal is checked for signal level of both harmonic and spurious signals ADT LINPUT_ STEP 4 RF OUTPUT UG 201A U TEST SPECTRUM ANALYZER CABLE ASSEMBLY Figure 4 6 Harmonic Distortion Test Setup EQUIPMENT Spectrum Analyzer eie e abe HP 8554B or 8555A 8552B 141T Test Spectrum Analyzer HP 8553B 8552B 141T Be EM HP 8554B or 8555A mM EP RPM MD 10503
71. HREAD 3030 0151 4 11 1 SCREW SET 10 32 UNF 2A THREAD 8030 0397 8 12 MIXER OUTPUT ASSY 08444 60012 1 A 1 1 C CER 1000 PF 20 100 VDCW 0160 2327 1 B ABA1C2 C FXD MICA 39 PF 5 250 VDCW 0160 2327 1 C 1 C FXD MICA 18 PF 5 250 VDCW 0160 3861 1 5 1 1 SCREW HD POZI DR 2 56 X 0 25 LG 0520 0128 4 E ASAIRI MET FLM 750 OHM 2 1 8W 0698 7233 1 F 141 See A5J1 ABOVE G 1 CONNECTOR SINGLE CONTACT 1251 1556 1 H ASAICR1 DIODE HOT CARRIER 1901 0633 1 J COIL CHOKE 0 39 UH 10 9100 2254 1 K ASAIMP3 LID RESONATOR HOUSING 08555 00031 1 L RESONATOR HOUSING 08555 20036 1 ITEM 12 MIXER OUTPUT assy Figure 8 18 A5 First Converter Assembly Illustrated Parts Breakdown 1 of 2 a A1 A8 4 Power S and Figure 8 18 A5 First Converter Assembly Illustrated Parts Breakdown 2 of 2 8 20 Item Ref Des Description HP Part No 1 DIODE VOLTAGE VAR 6 8 pF 0122 0245 ATC2 C3 C FXD 1000 pF 500 VDCW 0160 0345 A TCl C FXD 1 0 pF 0 1 0160 3827 FXD 562 0698 7230 ATR2 R FXD 619 OHM 0757 0418 1 1250 0829 SPRING COMPRESSION 1460 0103 A7Q1 TRANSISTOR SI NPN 1854 0292 WASHER LOCK 0 211 DIA 2190 0057 WASHER LOCK 0 191 DIA 2190 0124 SCREW SOCKET CAP 8 32 X 0 625 3030 0047 SCREW SET 10 32 X 1 000 LG 3030 0397 DELETED PC BOARD OSCIL
72. INPUT on Tracking Generator For use with 8555A Spectrum Analyzer System 18 inch low leakage coaxial cable with BNC connectors Three 8 each supplied Two required for 8555A Spectrum Analyzer System Three required for 8554B Spectrum Analyzer System Connects FIRST LO to FIRST LO THIRD LO to THIRD LO and SCAN OUTPUT to SCAN IN OUT Model 8444A TM 11 6625 2866 14 amp P General Information Table 1 3 Test Equipment and Accessories 1 of S Minimum Specifications Suggested Model Spectrum Analyzer System Frequency Comb Generator Spectrum Analyzer System Test Analyzer Power Meter Frequency Range 500 kHz 1 25 GHz Compatible with Tracking Generator Part of System Frequency markers spaced 100 MHz apart Frequency Accuracy 0 01 Output Amplitude 30 dBm to 1 5 GHz Frequency Range 500 kHz 4 GHz Amplitude Accuracy 1 dB Frequency Range 500kHz 1 6GHz Accuracy 1 Power Range 20 to 10 dBm HP 8554B or 8555A 8552B 141T Spectrum Analyzer System HP 8406A Comb Generator 8553B 8555 A 8552B 141T Spectrum Analyzer System HP435 A Power Meter with 8482 Ther istor Mount AC Voltmeter Frequency Range 10 Hz to 10 MHz Voltage Range 1 mV to 300V Calibration 10 to 2 dB 10 dB between ranges Accuracy 5 at 10 MHz HP 400E AC Voltmeter AC Voltmeter Voltage Accuracy 8 of full scale Voltage Range 300V full scale Input Impedance 10 megohms
73. LATNESS SPECIFICATION Amplitude Accuracy System Frequency Response 1 50 dB DESCRIPTION The Tracking Generator output is checked with the Spectrum Analyzer using either an 8555A or an 8554B RF Section A convenient reference level is set in the 2 dB LOG mode The overall power deviation is measured from 10 MHz to 1 3 GHz if 8555A RF Section is used or 500 kHz to 1 25 GHz if 8554B RF Section is used np 10 FREQENCY COUNTER INPUT AUX RF OUTPUT INTERCONNECT CABLE 08444 60017 8555A ONLY HP 8444A THIRD LO 85548 CABLE ASSEMBLY 08441 6012 FIRST LO 8454B 8555A EQUIPMENT Spectruri eaten a REIS 8554 8555 8552 141 Frequency COUNTER a 5340 Adapter Male to BNC Female 1 144 HP 1250 0780 Interconnect Cable 8555A THIRD LO HP 08444 60017 Interconnect Cable two required HP 08444 60018 Gable Assermibly ss eux asi SEMI P IIDAS HP 08441 6012 11 6625 2866 14 amp P 8444 PERFORMANCE TESTS 4 18 SYSTEM FLATNESS Cont d PROCEDURE 1 Perform preset adjustment procedures paragraph 4 7 for 8554B 8552B 141T Spectrum Analyzer System gra 9 for 8555A 8552B 141T Spectr
74. LATOR BLANK 08444 20003 INSULATOR 08444 20006 COVER OSC HOUSING BOTTOM 08444 20008 HOUSING OSCILLATOR 08444 20010 DIELECTRIC CAPACITOR 08444 20013 INNER ELEMENT CAPACITOR 08444 20015 COVER OSCILLATOR HOUSING TOP 08444 20028 INPUT OUTPUT LOOP 08555 00033 CAPACITOR OUTER ELEMENT 08555 20040 WASHER LOCK NO 4 2190 0008 SCREW MACHINE 4 40 X 0 438 LG 2200 0109 SCREW MACHINE 4 40 X 0 250 LG 2200 0139 SCREW MACHINE 4 40 X 0 375 LG 2200 0167 SCREW PAN HD 0 80 X 0 125 LG 0516 0003 NUT HEX 6 32 2420 0003 NUT HEX 10 32 2740 0002 3 DO PO b FE L n n amp PR 0 Co dl HO HF pO ka gu Y om OQ M OQ NM H Hn PR ee Figure 8 19 A7 1 55 GHz Oscillator Assembly Illustrated Parts Breakdown 2 of 2 Figure 8 19 A7 1 55 GHz Oscillator Assembly Illustrated Parts Breakdown 1 of 2 8 21 11 6625 2866 14 amp P Model 8444A APPENDIX A SERVICE NOTE P 0960 2038 P 5086 6025 HP MODEL 8444A TRACKING GENERATOR Serials Prefixed 1147A and Below REQUIRED MODIFICATION WHEN REPLACING A3 When replacing the A3 Amplifier Detector Assembly in the HP Model 84444 serials prefixed 1147A and below a capacitor C3 3300 pF HP Part No 0160 0155 is a required addition for proper instrument operation The capacitor is electrically connected between the RF Diode Signal l
75. M peak to peak Tuning Section Stabilized Unstablized 8554B 8555A 200 Hz 10 kHz DESCRIPTION The stability of the Spectrum Analyzer Tracking Generator System is checked using a HP 141T 8553B 8552B Spectrum Analyzer System which has less than 20 Hz peak to peak residual FM The Spectrum Analyzer in the system must be within residual FM specification limits Refer to appropriate RF Section Operating and Service Manual There are no adjustments in the Tracking Generator for residual FM residual FM is excessive 4 5 4 6 TM 11 6625 2866 14 amp P Model 8444A Performance Tests PERFORMANCE TESTS 4 17 Frequency Stability cont d ETIS jJ LODTPUT BNC CABLE RF OUTPUT 4 RF INPUT EQUIPMENT HP 8554B or 8555A 8552B 141T Test Spectrum Analyzer rennen HP 8553B 8552B 141T Gabler 10503 PROCEDURE 1 Perform preset adjustment procedures paragraph 4 7 for 8554B 8552B 141T Spectrum Analyzer System for 8555 8552 141 Spectrum Analyzer System 2 Connect test setup as indicated ih Figure 4 2 and make the following control settings SPECTRUM ANALYZER Tracking Generator Spectrum Analyzer System See paragraph SPECTRUM ANALYZER 8553 8552 141 Test Analyzer 2 0 110 EREQUENGCY
76. N THIS SPACE TELL WHAT i WRONG AND WHAT SHOULD BE DONE ABOUT IT amm cD Qu 4 CN a CD Cn ex TEAR ALONG PERFORATED LINE amam come DUE GNE CMM CED MEMO eee GEM 044822 001 KAXL s This manual is provided FREE OF CHARGE from the BoatAnchor Manual Archive as a service to the Boatanchor community It was uploaded by someone who wanted to help you repair and maintain your equipment If you paid anyone other than BAMA for this manual you paid someone who is making a profit from the free labor of others without asking their permission You may pass on copies of this manual to anyone who needs it But do it without charge Thousands of files are available without charge from BAMA Visit us at http bama sbc edu
77. O 4641 F C4 1 8 TO 4641 F C4 1 8 TO 1961 F C4 1 8 TO 4640 F 0844460025 11 6625 2866 14 amp P 8444 0 14 SECTION VIII SERVICE D 15 Description of Option 058 A two transistor 500 MHz fixed tuned local oscillator with power supply processing circuits Assembly A9 is added to the Main Deck of an 8444A The 500 MHz LO Output is brought out through a BNC connector on the rear panel directly above the BNC connector serving as the output of the THIRD LO INPUT Power supply voltages for the A9 500 MHz Oscillator Assembly are taken from the PC connector XA1 on the bottom of the 8444A Main Deck D 16 Figure D 1 is a top view of the 8444A including the Option 058 500 MHz A9 Oscillator Assembly with its BNC connector on the rear panel D 17 Figure D 2 shows the rear panel of an 8444A Option 058 with the added 500 MHz OUTPUT BNC connector above the THIRD LO INPUT connector 0 18 Figure D 3 is a schematic diagram of the 500 MHz Oscillator used with Option 058 a capacitance multiplier used as additional filter for the 8444A 20V power supply and an adjustable current regulator for the 10V 8444A power supply 11 6625 2866 14 amp 8444 19 BNC REAR PANEL W19 500 MHz OUTPUT CONNECTOR A5 OUTPUT CABLE J8 underneath AMPLIFIERS DETECTOR ASSY 10V 20V LEADS 500 MHz OSCILLATOR AY A9J1 OSCILLATOR OUTPUT 1 MOUNTING LOCATION Figure D 1 500 MHz LO Mounting location and Output Port
78. PART NUMBER AND FSCM CODE JOINING BRACKET KIT HP 5060 8543 ACCESSORY POWER CORD HP 8120 1575 ACCESSORY POWER CORD HP 8120 1576 1 G 2 11 6625 2866 14 amp P 11 6825 2866 14 amp P APPENDIX H MAINTENANCE ALLOCATION INTRODUCTION H 1 General This appendix provides a summary of the maintenance operations for SG 1125 U It authorizes categories of maintenance for specific maintenance functions on repairable items and components and the tools and equipment required to perform each function This appendix may be used as an in planning maintenance operations H 2 Maintenance Function Maintenance functions will be limited to and defined as follows a Inspect To determine the serviceability of an item by comparing its physical mechanical and or electrical characteristics with established standards through examination b Test To verify serviceability and to detect incipient failure by measuring the mechanical or electrical characteristics of an item and comparing those characteristics with prescribed standards c Service Operations required periodically to keep an item in proper operating condition i e to clean decontaminate to preserve to drain to paint or to replenish fuel lubricants hydraulic fluids compressed air supplies d Adjust To maintain within prescribed limits by bringing into proper or exact position or by setting the operating characteristics to the
79. Performance Test Record 8 3 Schematic Diagram Notes 8 3 Check and Adjustment Test Card Etched Circuit Soldering Equipment 8 4 Reference Designations and Abbreviations 6 2 8444A System Specifications With Option 058 D 1 Replaceable Parts 6 4 D 2 Replaceable D 4 6 3 Code List of Manufacturers 6 4 Part Number National Stock Number Cross Reference APPENDIXES SERVICE NOTE P 09602038 COMPONENTS OF END ITEM 5086 6025 1 SERVICE 08444 60019 1 ADDITIONAL AUTHORIZA C SERVICE 8444 1 TION 6 2 D MODEL 8444A TRACKING GEN MAINTENANCE ALLOCATION 1 ERATOR OPTION 058 I REPAIR PARTS AND SPECIAL REFERENCES E 1 TOOLS LISTS 1 1 11 6625 2866 14 amp MODEL 8444A 8120 1348 08444 60017 d 08444 60018 3 Figure 1 1 Model 8444A Tracking Generator and Accessories 1 0 11 6625 2866 14 amp P SECTION 0 INTRODUCTION 0 1 SCOPE This manual describes Generator Tracking SG 1125 U Hewlett Packard Model 844
80. Quality Deficiency Report Mail direct to Commander US Army Communications and Electronics Materiel Readiness Command ATTN DRSEL ME MQ Fort Monmouth NJ 07703 A reply will be furnished to you 0 5 ADMINISTRATIVE STORAGE Administrative storage of equipment issued to and used by Army activities shall be in accordance with paragraph 0 6 DESTRUCTION OF ARMY ELECTRONICS MATERIEL Destruction of Army electronics materiel to prevent enemy use shall be in accordance with TM 750 244 2 Model 8444A TM 11 6625 2866 14 amp P General Information SECTION I GENERAL INFORMATION 1 1 INTRODUCTION 1 2 This manual contains all information required to install operate test adjust and service the Hewlett Packard Model 8444A Tracking Generator This section covers instrument identification description options accessories specifications and other basic information 1 3 shows the Hewlett Packard Model 8444A Tracking Generator with accessories supplied 1 4 The various sections in this manual provide information as follows SECTION INSTALLATION provides information relative to incoming inspection power requirements mounting packing and shipping etc SECTION OPERATION provides information relative to operating the instrument SECTION IV PERFORMANCE TESTS provides information required to ascertain that the instrument is performing in accordance with published specifications SECTION V ADJUSTM
81. RACKING SG 1125 U HP 8444A Change 1 F 2 11 6625 2866 14 amp P SECTION BASIC ISSUE ITEMS GENERATOR TRACKING SG 1125 U 1 B ITEM 2 3 4 5 6 7 NATIONAL DESCRIPTION LOCATION USUABLE QTY QUANTITY STOCK ON REQD NUMBER PART NUMBER CAGE CODE RCVD DATE AC POWER CABLE 8120 1348 RACK MOUNTING KIT 5060 8739 INTERCONNECT CABLE 08444 60017 INTERCONNECT CABLES 3 08444 60018 OPERATING AND SERVICE MANUAL 08444 90012 Change 1 F 3 F 4 blank 11 6625 2866 14 amp P APPENDIX ADDITIONAL AUTHORIZATION LIST Section INTRODUCTION G 1 Scope This appendix lists additional items you are authorized for the support of the SG 1 125 U G 2 General This list identifies items that do not have to accompany the SG1125 U and that do not have to be turned in with it These items are all authorized to you by CIA MTOE TDA or JTA G 3 Explanation of Listing National stock numbers descriptions and quantities are provided to help you identify and request the additional items you require to support this equipment The items are listed in alphabetical sequence by item name under the type document i e MTOE TDA or ITA which authorizes the item s to you Next printed page is G 2 G 1 1 NATIONAL STOCK NUMBER SECTION Il ADDITIONAL AUTHORIZATION LIST 2 DESCRIPTION USABLE ON
82. SE PLASTIC METAL CASE G 50 Ga OR feast aoe cece DIODES DIODE SYMBOL ANODE CATHODE wide 1 END t iN E LE STRIPE i Iu A K gt CONICAL C THODE CATHOD TM 11 6625 2866 14 amp P Service 8 30 Operational Amplifier Troubleshooting Procedure Measure and record the voltage level at both the inverting terminal pin 2 and the noninverting terminal pin 3 The level should not differ by more than m 10 mV If the voltage level is not within m 10 mV check the external circuitry and components If the external circuitry input signal operating voltages feedback resistors is normal replace the operational amplifier 8 31 ELECTRICAL MAINTENANCE 8 32 Perform the electrical checks and adjustments once every six months and after repair or component replacement BI POLAR TRANSISTORS BLACK EPOXY PLASTIC TRANSISTORS E8C METAL CASE TRANSISTORS DUAL Figure 8 2 Examples of Diode and Transistor Marking Methods TM 11 6625 2866 14 amp P Model 8444A Service GAIN I RI R2 OUTPUT OUTPUT INPUT IMPEDANCE VERY HIGH OUTPUT IMPEDANCE VERY LOW C GAIN R1 R2 OUTPUT INPUT IMPEDANCE R2 OUTPUT IMPEDANCE VERY LOW IF A IS LARGE VE V4 Vg V4 1 21 9 0 n IF V5 70 THEN Vg V 1 gt R1 IF
83. TAMMS Procedures for Destruction of Electronics Materiel to Prevent Enemy Use Electronics Command E 1 TM 11 6625 2866 14 amp P APPENDIX F COMPONENTS OF END ITEM LIST Section INTRODUCTION 1 Scope This appendix lists integral components of and basic issue items for the SG 1 125 U to help you inventory items required for safe and efficient operation F 2 General This Components of End Item List is divided into the following sections a Integral Components of the End These items when assembled comprise the G1125 U and must accompany it whenever it is transferred or turned in The illustrations will help you identify these items b Section TII Basic Issue Items These are the minimum essential items required to place the SG 1125 U in operation to operate it and to perform emergency repairs Although shipped separately packed they must accompany the SG 1125 U during operation and whenever it is transferred between accountable officers illustrations will assist you with hard to identify items This manual is your authority to requisition replacement based on TOFEMTOE authorization of the end item F 3 Explanation of Columns a Illustration This column is divided as follows 1 Figure number Indicates the figure number of the illustration on which the item is shown 2 ltem number The number used to identify item called out in the illustration b National Stock Number Ind
84. TENSITY control fully CCW Allow instruments to warm up for at least 30 minutes Perform Spectrum Analyzer Operation Check Refer to 8558B Spectrum Analyzer Operating Manual 0 2 11 6625 2866 14 amp P Model 8444A 6 Set Spectrum Analyzer LOG LINEAR control to LOG and BANDWIDTH to 300 kHz 7 Set OPTIMUM INPUT dBm to 0 and REF LEVEL dBm to 0 dBm 8 Make the following interconnections between tracking Generator and Spectrum Analyzer 16 a 85588 FIRST LO OUTPUT to 8444A FIRST LO INPUT b 85588 RF OUTPUT to the 8444A RF INPUT c Jumper 500 MHz OUTPUT to THIRD LO INPUT Rear Panel 8444A 058 Check that the Spectrum Analyzer controls are set as follows INTENS IY DEED 12 o clock approx FREQUENCY MAZ 30 MHz HESOBUTIONIB xt tte tiu et dtt tette oc A Lu eiue d 300 kHz FREQ SPAN DINA i etc 50 kHz BASELINE CUPPER CCW SWEEP 5 MILLISECONDS dB DIVEN eee MD OD MED 10 dB DIV OPTIMUM INPUT diim 0 GB tutte AAT A AE 0dBm REF FINE 0 2 o clock SWEEP TRIGGER output ME uL MEI LINE Set Tracking Generator LEVEL control to 0 dBm and adjust TRACK ADJ for maximum signal amplitude indication on CRT display Adjust Spectrum Analyzer REF LEVEL FINE control or Tracking Generator LEVEL control to position sign
85. TION Do not use a sharp object such as an an awl or twist drill for this purpose Sharp objects may damage the plated through conductor d After soldering remove excess flux from the soldered areas and apply a protective coating to prevent contamination and corrosion 8 22 Component Replacement The following procedures are recommended when component replacement is necessary a Remove defective component from board b If component was unsoldered remove solder from mounting holes with a suction device or a wooden toothpick c Shape leads of replacement component to match mounting hole spacing d Insert component leads into mounting holes and position component as original was positioned Do not force leads into mounting holes sharp lead ends may damage the plated through conductor TM 11 6625 2866 14 amp P Service NOTE Although not recommended when both sides of the circuit board are accessible axial lead components such as resistors and tubular capacitors can be replaced without unsoldering Clip leads near body of defective component remove component and straighten leads left in board Wrap leads of replacement component one turn around original leads Solder wrapped connection and clip off excess lead 8 23 GENERAL SERVICE INFORMATION 8 24 Transistors and diodes are used throughout the RF Section in circuit configurations such as delay circuits trigger circuits switches oscillators and various types
86. UKEE WIS 53204 03553 AMPHENOL CORP BRDADVIEW ILL 60153 02735 RCA SOLID STATE amp RECEIVING TUBE DIV SOMERVILLE N J 08876 04713 MOTOROLA SEMICONDUCTOR PROD INC PHOENIX ARIZ 85008 07203 FAIRCHILD CAMEPA amp INST CORP SEMICONDUCTOR DIV MOUNTAIN VIEW CALIF 94040 12954 DICKSON ELECTRONIC CORP SCOTTSDALE ARIZ 85252 24931 SPECIALTY CONNECTOR CO INC INDIANAPOLIS IND 46227 28480 HEWLETT PACKARD COMPANY PALO ALTO CALIF 94304 56289 SPRAGUE ELECTRIC CO N ADAMS MASS 01247 71400 BUSSMANN MFG DIV MC GRAW EDISON CO ST LOUIS MO 63017 71785 CINCH MFG CO DIV TRW INC ELK GROVE VILLAGE ILL 72982 ERIE TECHNOLOGICAL PROD INC ERIE PA 16512 75915 LITTELFUSE INC DES PLAINES ILL 60016 80131 ELECTRONIC INDUSTRIES ASSOCIATION WASHINGTON D C 20006 87034 MARCOAK INDUSTRIES ANAHEIM CALIF 92803 91506 AUGAT INC ATTLEBORO MASS 02703 95354 METHODE MFG CO ROLLING MEADOWS ILL 60008 96733 SAN FERNANDO ELECT MFG CO SAN FERNANDO CALIF 91341 98291 SEALECTRO CORP N Y 0544 11 6625 2866 14 amp P Table 6 4 PART NUMBER NATIONAL STOCK NUMBER CROSS REFERENCE INDEX NATIONAL NATIONAL PART STOCK PART STOCK NUMBER FSCM NUMBER 1 NUMBER FSCM NUMBER A1H 87034 6240 00 951 3376 0698 3160 28480 5905 00 974 6078 B104BX102M 96733 5910 00 244 7171 0698 3399 28480 5905 00 405 2867 FDG1088 07263 5961 00 928 7939 0698 3437 28480 5905 00 402 7080 SR1358 4 04713 5961 00 496 7363 0698 343
87. UNTER POWER METER DIGITAL VOLTMETER TEST LEADS Figure 5 2 1 55 GHz LO Power Level and Frequency Check and Adjustment Test Setup EQUIPMENT Power Meter with HP 84788 Thermistor HP 432A Frequency Counter with 5254C Plug in HP 5245L Digital Voltmeter with HP 3443A Plug in 2 HP 3440A Test Leads dual banana plug to probe and alligator clip HP 11003A Cable Assy SMA male to male sssss HP 08555 60076 Cable Assy male connectors HP 10503A Coaxial Attenuator Option 010 HP 8491A Adapter BNC barrel HP Part Number 1250 0080 _ UG 914A U Adapter to enne nennen nne nnne UG 201A U PROCEDURE 1 Perform Power Supply Check and Adjustmentj paragrap 2 Apply power to Tracking Generator and allow 1 hour for instrument to warm up and stabilize 3 Disconnect Cable W8 at Isolator J2 see Figures 8 4 and 8 12 4 With test setup as indicated ir Figure 5 2 connect Power Meter Isolator J2 via 08555 60076 cable 10 dB attenuator and UG 914A U adapter 5 Rotate TRACK ADJ control throughout its tuning range while noting power level indicated on Power Meter 6 Minimum power output must be greater than 5 dBm gt 5 dBm 11 6625 2866 14 amp P Mod
88. UT and Spectrum Analyzer INPUT Connect Thermistor Mount and Power Meter to Tracking Generator RF OUTPUT Connect test lead jumper between A2TP1 and A2TP2 Adjust A2R17 NULL ADJ for output level of 0 1 0 dBm indication on Power Meter Remove jumper between A2TP1 and A2TP2 Adjust A2R41 dBm LEVEL for output level of 0 0 5 dBm indication on Power Meter Adjust Test Oscillator for 10 kHz output Connect Test Oscillator output through 100K ohm resistor to A2TP4 Connect AC Voltmeter to A2TP1 Adjust Test Oscillator output amplitude for an indication of 7 dB 001 VOLTS RANGE on AC Voltmeter Connect AC Voltmeter to A2TP2 Adjust A2R7 GAIN ADJ for an indication of 10 dB 001 VOLTS RANGE on AC Voltmeter Adjust A2R17 NULL ADJ for Tracking Generator output of 0 dBm Repeat steps 16 and 17 until both levels are obtained Disconnect AC Voltmeter and Test Oscillator Repeat steps 7 through 10 above Connect DC Voltmeter across A2TP1 and A2TP3 COM to A2TP1 and VOLTS to A2TP3 5 12 11 6625 2866 14 amp Model 8444A Adjustments ADJUSTMENTS 5 12 Automatic Level Control ALC Check and Adjustment cont d 22 Adjust A2R6 LIMIT SET for an indication of 0 3 on DC Voltmeter 23 Disconnect DC Voltmeter 24 Perform Level Control Calibration paragraph 5 13 5 13 Level Control Calibration Check and Adjustment REFERENCE Service Sheet 4 DESCRIPTION The level control circuitry is adjusted to provide a 1
89. V RE d ill 2 C d Mn d xXESSORY ux POWER ws REFERENCE DESIGNATIONS SENSE CHASSIS 1 SEE SCHEMATIC DIAGRAM NOTES TABLE 83 m 02 ul REM We wig REFERENCE DESIGNATIONS NITNIN OUTLINED s M XAL ASSEMBLIES ARE ABBREVIATED FULL DESIGNATION IN CLUDES ASSEMBLY NUMBER e RI OF ASSEMBLY fl 15 AIRI DESIGNATIONS OF OTHER COMPONENTS ARE CONPLETE AS SHOWN 5 Ee zx gt Figure 8 17 Power Supply and Input Circuit Schematic Diagram 5 Figure 8 16 A1 Power Supply Assy Component Location 8 19 11 6625 286614 amp Service TM 11 6625 2866 14 amp P Model 8444 Item No Ref Des Description HP Part No 1 INPUT OUTPUT LOOP 08555 00033 2 ASMP2 SCREW PAN HD SLOT DR 0 80 X 0 88 LG 0516 0005 2 3 A5J1 CONNECTOR RF 50 OHM SCREW ON 1250 0829 3 3 AbJ2 CONNECTOR 50 SCREW ON 1250 0829 8 3 A5J3 CONNECTOR RF 50 OHM SCREW ON 1250 0829 3 4 SCREW HD POZI DR 5 40 X 0 5 LG 2200 0111 14 5 CAVITY BLOCK FIRST CONVERTER 08555 20035 1 6 5 COVER CAVITY BLOCK 08444 20012 1 7 SCREW FLAT HD POZI DR 4 40 X 0 874 LG 2200 0172 2 8 CENTER POST CAVITY 08444 20007 1 9 ASMP8 NUT HEX STL 10 32 X 3 8 2740 0001 3 10 9 SCREW SOCKET 4 40 T
90. V470 4 THEN Vor Vale Figure 8 3 Operational Amplifier Equivalent Circuit 8 7 8 8 11 6625 286614 amp Model 8444A 11 6625 2866 14 amp P Service TOP BOTTOM AD A WS Wb 68 TUNE MIN TUNE 0 B iil M SCAN Figure 8 4 Major Assembly Locations 1 Figure 8 4 Major Assembly Locations Figure 8 5 Adjustment and Test Point nv 89 8 9 11 6625 286614 amp 11 6625 2866 14 amp P Service 11 6625 2866 14 amp P Model 8444A SERVICE SHEET 1 GENERAL The HP Model 8444A Tracking Generator is designed for operation with either the HP Model 8554L 8552 140 series or the HP Model X 8555A 8552 140 series Spectrum Analyzer Systems When used with the EE GaP T TR a ERA AD ee T iP p tr RACE T wy th UE OT 85541 Spectrum Analyzer RF Section the Tracking Generator covers the FIRST SECOND THIRD FOURTH alvzer svs 5 MES MIXER MIXER MIXER MIXER full range of the analyzer system When used with the 8555A Spectrum ATTENUATOR Analyzer RF Section the Tracking Generator covers the 10 MHz to 1 3 GHz AND DETECTOR frequency range on the n 1 2 05 GHz IF band e A simplified block diagram of the Spectrum Analyzer Tracking Generator is illustrated in Figure 7 6 In the spectrum analyzer tracking generator
91. Wu REFEREN DIODE TM 11 6625 286614 amp P Service TM 11 6625 2866 14 amp P OUTPUT A3 MICROCIRCUIT ASSEMBLY BOTTOM VIEW SERIAL NUMBER 101 AND ABOVE 1958 98 an O 0 x WIRING DETAIL AB MICROCIRCUIT ASSEMBLY BOTTOM VIEW SERIAL NUMBER 100 AND BELOW 98 958 Second Converter Circuit Schematic Diagram SERVICE SHEET 5 THEORY OF OPERATION Service Sheet 5 contains the schematic diagram for the 20 and 10 volt power supplies the input line voltage circuit and a wiring diagram of the input line switch and power line module n INPUT LINE VOLTAGE CIRCUIT Both schematic and wiring diagram are shown for the input line voltage circuit For 230 volt operation replace the 0 5 ampere fuse with a 0 25 ampere fuse The power line module ON OFF switch wiring diagram provides a rear view for circuit tracing or component replacement Bl 20 VOLT POWER SUPPLY The 20 volt supply consists of bridge rec AICRI CRA series regulator Qi filter driver 193 current solurce A1Q1 Q2 foldback current limiter A1Q4 sense amplifier anc over voltage and reverse voltage protection circuit consisting of 195 1 10 The 28V rms at 0 5 Amp input from power transformer 1 is rectified by diodes 1 1 and filtered by to provid e 40 volt unregulated source to series regulator Q1 At in
92. _ 10 dB SCAN TIME PER DIVISION 20 MILLISECONDS LOG REF LEVEE eene met OdBm VIDEO FILTER asses kena sens seen 100 Hz SCAN MODE rococo stao co DODGE INT SCAN TRIGGER ooo esp SOR AUTO LOG LINEAR ione eee EID Ie LOG b Tracking Generator control settings TRACK ADJ eee Peak LEVEL Figure 3 5 20 MHz Crystal Filter CRT Display 3 15 Bandpass Filter Measurement 3 16 Figure 3 6 illustrates the CRT display for a 50 MHz bandpass filter Filter characteristics 50 MHz 4 pole bandpass filter adjusted for band width of approximately 5 MHz at the 3 dB points Bandwidth at 60 dB points is approximately 32 MHz a Spectrum Analyzer 8555A control settings 50 MHz BANDWIDTH oae toan toa eu ie 10 kHz SCAN WIDTH PER DIVISION 5 MHz INPUT ATTENUATION _ 10 dB TM 11 6625 2866 14 amp P Operation SCAN TIME PER DIVISION 0 5 SECONDS LOG REF LEVEL 0 dBm VIDEO FILTER 10Hz AUTO LOG LINEAR LOG b Tracking Generator control settings Figure 3 6 50 MHz Filter CRT Display 3 17 Low Pass Filter Measurement 3 18 Figure 3 7 illustrates the
93. age from 103 5 to 126 5 volts The 20 volt regulated output should not vary more than 20 mV AC Input 20 Vdc Output 103 5V 115V 126 5V Set ac line voltage to 115 volts Adjust AIR14 for 20 00 Vdc 20 mV at test point A1TP1 Disconnect ac voltmeter from connector J6 Connect digital voltmeter to A7C3 and chassis ground 10 volt test point Measure and record voltage level Voltage level should be 10 0 0 5 volts 10 0 Vdc Output Set HP 400E AC Voltmeter RANGE to 001 VOLTS full scale and measure ac ripple on 20 and 10 volt sense lines Ripple should be less than 200 pV Measure and record ac ripple between power supply sense lines and chassis ground 20 Volt Output XA1 pin 6 10 Volt Output A7C3 Remove input line power and replace cover over power line module Replace right side cover and top cover If the dc supplies are out of tolerance refer to Service Sheet 5 for trouble isolation procedure 11 6625 2866 14 amp Model 8444A Adjustments ADJUSTMENTS 5 9 1 55 GHz Oscillator Power Level Frequency Check and Adjustment REFERENCE Service Sheet 3 DESCRIPTION The 1 55 GHz local oscillator is checked for power output level and frequency tuning range Oscillator frequency is determined primarily by the LO cavity with tuning range determined by the drive voltage from the oscillator driver The oscillator is checked first for power level and then for frequency and tuning range FREQUENCY CO
94. al on CRT LOG REF level graticule line System calibrated at 30 MHz with an amplitude accuracy of 0 5 dB Set Spectrum Analyzer to scan desired frequency range Insert device to be tested between Tracking Generator RF OUTPUT and Spectrum Analyzer RF INPUT Set Spectrum Analyzer Sweep Time to MAN Rotate Spectrum Analyzer MANUAL SWEEP control clockwise to tune system through selected frequency range For automatic scanning set SCAN MODE switch to INT and SWEEP TIME DIV to desired scan time D 11 SECTION IV PERFORMANCE TESTS D 12 Add the following Proper operation of the SPECIAL 500 MHz Oscillator after a one hour warmn up may be checked in the following manner 1 2 3 4 Connect the 500 MHz OUTPUT Third LO OUTPUT Figure D 2 on the rear panel of the 8444A to a 432A Power Meter Adjust L O PWR on Oscillator Assembly A9 to set oscillator output power to 4 dBm 5 dB Disconnect oscillator output from power meter and connect to 5254C Frequency Counter Adjust FREQ ADJ on Oscillator to set frequency to 500 MHz 200 kHz D 3 TM 11 6625 2866 14 amp P Model 8444A 5 Check power output again and re adjust if necessary 6 Repeat steps 2 through 5 until the two test limits are both met 0 13 SECTION VI REPLACEABLE PARTS 6 4 Table 6 2 Add the following parts Reference Designation HP Part Number 0844460024 01602357 0160 2357 1250 0828 0855400015 06987200 0844460020 0160 2247 0121
95. amplitude modula amplifier automatic phase control assembly auxiliary average American wire binary coded decimal copper beat frequency oscillator binder head breakdown bandpass bandpass filter brass counter clock wise ceramic channel circulator electrical connector stationary portion coil inductor meter miscellaneous mechanical part electrical connector movable portion plug transistor SCR triode thyristor resistor thermistor switch transformer terminal board thermocouple test point ABBREVIATIONS coefficient common composition complete connector cadmium plate cathode ray tube complementary transistor logic continuous wave clockwise centimeter digital to analog decibel decibel referred to 1 mW direct current degree temperature interval or differ ence degree plane degree Celsius centigrade degree Fahrenheit degree Kelvin deposited carbon detector diameter diameter used in parts list DIFF AMPL differential amplifier division double pole double throw double sideband diode transistor logic digital voltmeter emitter coupled logic electromotive force NOTE electronic data processing electrolytic encapsulated external farad flat head fillister head frequency modulation front panel frequency fixed gram germanium gigahertz glass ground ed heterodyne hexagonal mercury high Hewlett Packard high pass filter h
96. assure careful handling 8120 1351 8120 1689 Figure 2 1 Power Cable Line Connector Labels Model 8444A Operation TM 11 6625 2866 14 amp P SECTION III OPERATION 3 1 INTRODUCTION 3 2 This section provides complete operation instructions for the HP Model 8444A Tracking Generator Front and rear panel controls connectors and indicators for the Tracking Generator are identified and described in Figures 3 1 and 3 2 Operational connections and adjustments for the Tracking Generator and an 8554B Spectrum Analyzer System are detailed in Figure 3 3 Operational connections and adjustments for the Tracking Generator and an 8555A Spectrum Analyzer System are detailed in Figure 3 4 Additional operating information is contained in through 3 10 3 3 PANEL FEATURES 3 4 Front and rear panel features of the Tracking Generator are described in Figures 3 1 3 2 Front and rear panel views of the Tracking Generator connected to the HP 8554 8552 141 Spectrum Analyzer are shown in Front and rear panel views of the Tracking Generator connected to the HP 8555A 8552 141T Spectrum Analyzer are shown in Figure 3 4 For a detailed description of the Spectrum Analyzer controls connectors and indicators refer to the appropriate operating and service manuals for those instruments Interconnection wiring between the Tracking Generator and the Spectrum Analyzer is contained in Section VIII Service Sheet 1 of this manual
97. ates from 0 1 msec div to 10 sec div in a 1 2 5 sequence Manual Scan is available with the external sweep voltage from the 8444A or by a front panel control of the 85528 IF Section PRECISION FREQUENCY MEASUREMENTS An external counter output is provided on the 8444A for precision frequency measurements The frequency of unknown signals as well as the frequency of any point on a frequency response curve can be measured The use of the HP 5300A 5303A Counter is suggested for frequency measurements to 500 MHz and the HP 5245L 5254C Counter for measurements to 1300 MHz Frequency Accuracy For unknown signals 10 kHz Tracking drift typically 5 2 10 min after 2 hour warmup For points on frequency response curve Counter accuracy Residual FM Counter Mode of Operation Manual Scan Scan determined either by front panel control of 8552B IF Section or by external scan signal provided by the 8444A Zero Scan Analyzer is fixed tuned receiver Counter reads center frequency to accuracy of tracking drift Counter Output Level 0 1 V rms GENERAL SPECIFICATIONS Temperature Range Operation 0 to 550C storage 40 C to 75 C Power 115V and 230V 48 to 440 Hz 12 watts max Model 8444A MANUAL SCAN control on the Tracking Generator allows manual tuning of the Spectrum Analyzer Tracking Generator System amplitude of the Tracking Generator output is adjustable over a 0 to 10 dBm range by a front panel vernier c
98. ce Repair overhaul AMPLIFIER AND DETECTOR ASSEMBLY Test A3 Replace AMPLIFIER ASSEMBLY A4 Inspect Test 1 thru 3 8 thru 12 Replace Repair Overhaul FIRST CONVERTER ASSEMBLY 5 Inspect 1 thru 3 8 thru 12 Adjust Replace FIRST MIXER ASSEMBLY 1 Repair Replace SECOND CONVERTER ASSEMBLY Inspect 1 thru 3 8 thru 12 OSCILLATOR ASSEMBLY Inspect Adjust Replace Change 1 H 3 1 TOOL OR TEST EQUIPMENT REF CODE 10 11 12 13 14 15 16 17 18 19 20 21 11 6625 2866 14 amp P SECTION TOOL AND TEST EQUIPMENT REQUIREMENTS 2 MAINTENANCE LEVEL FOR GENERATOR TRACKING SG 1125 U 3 NOMENCLATURE ANALYZER SPECTRUM IP 1216 P GR PLUG IN UNIT SPECTRUM ANALYZER PL 1406 U PLUG IN UNIT ELECTRONIC TEST EQUIPMENT PL 1388 U GENERATOR SIGNAL SG 1129 U ANALYZER SPECTRUM IP 1216 P GR PLUG IN UNIT ELECTRONIC TEST EQUIPMENT PL 1399 U PLUG IN UNIT ELECTRONIC TEST EQUIPMENT PL 1388 U POWER METER HEWLETT PACKARD 436A POWER SENSOR HEWLETT PACKARD 8482A VOLTMETER 15 185 MULTIMETER ME 303A U COUNTER ELECTRONIC TD 1225 V 1 U GENERATOR SIGNAL AN USM 205A GENERATOR SIGNAL AN GRM SOC GENERATOR SIGNAL AN USM 44B GENERATOR SIGNAL SG 340A G VOLTMETER DIGITAL AN GSM 64B TRANSFORMER VARIABLE POWER 16 0 POWER SUPPLY DUAL DC HP 6205B TOOL KIT TK 100 G 4 NATIONAL NATO STOCK NUMBER 6625 00 424 4370 6625 00 1
99. cord oscillator frequency 1 548 000 500 kHz Rotate TRACK ADJ control fully clockwise and record oscillator frequency 1 552 000 500 kHz Record frequency tuning range frequency recorded in step 9 minus frequency recorded in step 8 4 000 500 kHz If data recorded in steps 6 8 9 and 10 is within tolerance no adjustment is required If power level recorded in step 6 is less than 5 dBm proceed to step 23 If data recorded in steps 8 9 or 10 is not within tolerance proceed with step 14 Connect Digital Voltmeter to test point A2TP5 Set TRACK ADJ control fully clockwise Set MAX TUNE potentiometer A2R26 fully counterclockwise Adjust MIN TUNE potentiometer A2R27 to set voltage at test point A2I P5 to level indicated on oscillator label See steps 23 through 30 for method of obtaining voltage level Measure and record oscillator frequency Adjust MAX TUNE potentiometer to increase oscillator frequency 4 000 50 kHz above frequency recorded in step 17 Record oscillator frequency Set TRACK ADJ control to center of tuning range recorded in steps 17 and 18 above Record oscillator frequency If frequency recorded in step 19 is not within 500 kHz of 1 550 GHz adjust A7ADJ 1 to tune oscillator frequency to 1 550 GHz 100 kHz If oscillator frequency is adjusted repeat steps 15 through 20 Repeat steps 4 through 11 above If power level recorded in step 6 is less than 5 dBm connect Power Meter as indicated in step 4 Re
100. crovolt microvolt ac microvolt dc microvolt peak microvolt peak to peak microvolt rms microwatt nanoam pere no connection normally closed neon negative nanofarad nickel plate normally open nominal Normal negative positive negative negative positive Zero zero tempera ture coefficient not recommended for field replace ment not separately replaceable nanosecond nano watt order by descrip tion outside diameter oval head operational peak used in parts list Pulse amplitude modulation printed circuit pulse code modula tion pulse count modulation pulse duration modulation picofarad phosphor bronze Phillips positive intrinsic negative peak inverse oscillator phase modulation Positive negative positive POLY PORC POS polystyrene porcelain Positive position s used in parts list position potentiometer 2 peak to peak peak to peak used in parts list pulse position modulation PREAMPL preamplifier PRF pulse repetition frequency pulse repetition picosecond point pulse time modulation pulse width modulation peak working resistance capacitance rectifier reference regulated replaceable radio frequency radio frequency interference round head right resistance inductance capacitance RMO rack mount only rms root mean square ROM read only memory rack and panel reverse working voltage Scattering parameter second ti
101. ctrum Analyzer 5 RF OUTPUT Type N Connector Tracking Generator output connector Frequency adjusted to track tuning of Spectrum Analyzer by TRACK ADJ 3 Output level adjusted by LEVEL 4 THIRD LO INPUT Type BNC connector Input for Spectrum Analyzer third LO 500 MHz Normally used with 8554B RF Section Parallel with rear panel THIRD LO INPUT which is normally used with 8555A RF Section FIRST LO INPUT Type BNC connector Input for Spectrum Analyzer first LO 2 05 3 3 GHz with 8554L RF Section 2 05 4 1 GHz with 8555A RF Section SCAN OUTPUT connector Manual tune voltage to Spectrum Analyzer 0 to 10 Vdc Voltage level controlled by position of MANUAL SCAN 2 Figure 3 1 Model 8444A Tracking Generator Front Panel Controls Indicators and Connectors 3 2 Model 8444A TM 11 6625 2866 14 amp P Operation REAR PANEL AUX RF OUTPUT Type BNC connector Tracking Generator auxiliary RF output Same frequency as signal out front panel RF OUTPUT connector For use with external frequency counter during precision frequency measurements Terminate in 50 ohms THIRD LO INPUT Type BNC connector Input for Spectrum Analyzer third LO 500 MHz Normally used with 8555A RF Section Parallel with front panel THIRD LO INPUT which is normally used with 8554B Section ACCESSORY OUTLET Line power outlet Connected to power line module input Provides ac outlet
102. d Adjustment Power Output Frequency Tuning Range 1 55 GHz Oscillator Residual FM Check Residual FM peak to peak First Converter Check and Adjustment Output Signal Level Level Control Calibration Check and Adjustment 10 dBm LEVEL position 0 dBm LEVEL position Measurement Unit Actual 5 15 5 16 5 15 5 16 Model 8444A TM 11 6625 2866 14 amp P Replaceable Parts SECTION VI REPLACEABLE PARTS 6 1 INTRODUCTION 6 2 This section contains information for ordering parts Table 6 1 lists abbreviations used in the parts list and throughout the manual lists replaceable parts in reference designator order 6 3 contains names and addresses that correspond to the manufacturer s code numbers 6 3 ABBREVIATIONS 6 4 Table 6 T gives a list of abbreviations used in the parts list schematics and throughout the manual In some cases two forms of the abbreviations are given one is in capital letters while the other is partial or no capitals This occurs because in the parts list abbreviations are all capitalized However in the schematics and other parts of the manual other abbreviation forms are used with both lower case and upper case letters 6 5 REPLACEABLE PARTS LIST 6 6 Table 6 2 is a list of replaceable parts and is organized as follows a Electrical assemblies and their components in alpha numerical order by reference designation b Chassis mounted parts in alpha numeric or
103. der by reference designation c Miscellaneous parts The information given for each part consists of the following a The Hewlett Packard part number b The total quantity Qty used in the instrument c The description of the part d The typical manufacturer of the part in a five digit code e Manufacturer code number for the part The total quantity for each part is given only once at the first appearance of the part number in the list 6 7 ORDERING INFORMATION 6 8 To order a part listed in the replaceable parts table note the Hewlett Packard part number and then Cross Reference that part number to the National Stock Number listed in table 6 5 Then order through normal ordering channel 1 s 6 9 If the part number does not have a National Stock Number then order through normal ordering channels using the Hewlett Packard part number 6 10 Refer to table 6 4 for part number to NSN cross reference 11 6625 2866 14 amp P Model 8444A Replaceable Parts Table 6 1 Reference Designations and Abbreviations REFERENCE DESIGNATIONS assembly attenuator isolator termination fan motor battery capacitor coupler diode diode thyristor varactor directional coupler delay line annunciator signaling device audible or visual lamp LED ampere alternating current accessory adjustment analog to digital audio frequency automatic frequency control automatic gain
104. e applicable tool or test equipment for the maintenance functions b Maintenance Category The codes in this column indicate the maintenance category allocated the TM 11 6625 2866 14 amp P tool or test equipment c Nomenclature This column lists the noun name and nomenclature of the tools and test equipment required to perform the maintenance functions d National NATO Stock Number This column lists the National NATO stock number of the specific tool or test equipment e Tool Number This column lists the manufacturer s part number of the tool followed by the Federal Supply Code for manufacturers 5 digit in parentheses H 5 Remarks Sec IV a Heference Code This code refers to the appropriate item in section Il column 6 b Hemarks This column provides the required explanatory information necessary to clarify items appearing i Next printed page is H 3 H 2 11 6625 2866 14 amp P SECTION Il TOOL AND TEST EQUIPMENT REQUIREMENTS FOR GENERATOR TRACKING SG 1125 U 2 3 4 5 MAINTENANCE MAINTENANCE CATEGORY TOOLS AND COMPONENT ASSEMBLY FUNCTION EQUIPMENT REMARKS GENERATOR TRACKING SG 1125 U Inspect Test 1 thru 17 Adjust 1 thru 13 17 thru 21 Repair 1 thru 13 17 thru 21 Overhaul 1 thru 21 POWER SUPPLY BOARD ASSEMBLY AP Inspect Test 10 11 17 Adjust Replace Repair Overhaul DRIVER BOARD ASSEMBLY A2 Inspect Test 1 thru 3 8 thru 13 Adjust Repla
105. ed with alligator clips PROCEDURE 1 Perform Spectrum Analyzer calibration procedure refer to appropriate operation and service manual 2 Connect test setup as indicated in Figure 5 7 and set controls as follows Spectrum Analyzer BAND Ma 1 2 05 GHz IF FREQUENCY 30 MHz 100 kHz ZERO 11 6625 2866 14 amp P Model 8444A Adjustments ADJUSTMENTS 5 12 Automatic Level Control ALC Check and Adjustment cont d INPUT ATTENUATION dent c hene qe tags 10 dB TUNING STABLIZER aaiae ae E nennen enne ON SIGNAL IDENTIEIER cadis OFF pir Max CCW SCAN TIME PER DIVISION sssessseeeeennnee enne 10 MILLISECONDS LOG REP LEVEL eque p Een IU em eimi 10 dBm pati c LOG VIDE ORI TER E OFF AUTO Tracking Generator toc dd a Cd cC res ON TRACK ADI x xx be Peak signal indication on CRT v M aah M EM RM e 0 dBm 10 11 12 13 14 15 16 17 18 19 20 21 Allow instruments to warm up and stabilize for at least 30 minutes Adjust TRACK ADJ for maximum signal indication on CRT display Disconnect cable between Tracking Generator RF OUTP
106. el 8444A Adjustments ADJUSTMENTS 5 9 1 55 GHz Oscillator Power Level Frequency Check and Adjustment cont d 7 Connect Frequency Counter to Isolator J2 via 08555 60076 cable UG 914A U adapter and to BNC cable 8 Rotate TRACK ADJ control fully counterclockwise and record oscillator frequency 1 548 000 500 kHz 9 Rotate TRACK ADJ control fully clockwise and record oscillator frequency 1 552 000 500 2 _____ 10 Record frequency tuning range frequency recorded step 9 minus frequency recorded step 8 4 000 500 kHz 11 If data recorded in steps 8 9 and 10 is within tolerance no adjustment is required 12 If data recorded in steps 8 9 or 10 is not within tolerance proceed with step 13 13 Connect Digital Voltmeter to test point A2TP5 14 Set TRACK ADJ control fully clockwise Set MAX TUNE potentiometer A2R26 and MIN TUNE potentiometer A2R27 fully counterclockwise Measure voltage at A2TP5 Voltage should be 1 0 1 Vdc 40 9 1 1 15 Measure and record oscillator frequency 16 Adjust MAX TUNE potentiometer A2R26 to increase oscillator frequency 4 000 50 kHz above frequency recorded in step 15 Record oscillator frequency 17 Set TRACK ADJ control to center of tuning range recorded in steps 15 and 16 above Record oscillator frequency 18 If frequency recorded in step 17 is not within 500 kHz of 1 550 GHz adjust A7ADJ 1 to tune oscillator frequency to 1 550 GHz 100 kHz 19 If oscillator frequenc
107. ency Check for 1 55 GHz 2 Refer to Service Sheet 3 for First Converter Troubleshooting procedure Refer to Service Sheet 4 for Second Converter Assy AG Troubleshooting procedures ISOLATOR ATI 2 3 4 BP FILTER FLI TRACK ADJ 5 AMPLIFIER PIN DIODE MODULATOR ASSY A4 v THIRD LO LIMITER AMPL ALC w i PIN MODULATOR n gt zd ATTENUATOR 9 WD gt 500 MHz prc d OUTPUT THIRDLO _ Lcd Ato wv INPUT NOTE 1 2 500 MHz m 3 NOTES 1 POWER LEVELS SHOWN ARE FOR CLOSED ALC LOOP LEVELS 2 DURING TROUBLESHOOTING WITH ALC LOOP OPEN ADJUST MODULATOR NULL FOR 500 MHz OUTPUT LEVEL OF 81 AT 412 3 SEE LABEL ON OSCILLATOR COVER FOR POWER OUTPUT LEVEL gt Ken ISOLATOR AT2 SECOND CONVERTER ASSY A6 1 9 V el w8 1 55 GHz ezme 7 dBm H D FIRST CONVERTER ASSY A5 MODULATOR OSCILLATOR DRIVER ASSY A2 ALC CONTROL 7 71 1 py S PERLES 71 1 Loss mae 105521248 CONVERSION 1055 7 dB wi aji w D W il m w4 Ersson 50 95 ran gt gt Ud 1 1 1 2 05104 GHe V 1 8 BdBm een d MODULATOR OSCILLATOR DRIVER ASSY A2 D gv 125 GHz OSCILLATOR ASSY Ree FREQUENCY 1 ISOLATOR CONTROL
108. f 0 to 1 3 GHz at a level of 0 to 10 dBm RF OUTPUT t i Lu Sweep and tune control of the Spectrum Analyzer from ihe Tracking Generator is provided by a 0 to 10 volt signal controlled by a front panel MANUAL SCAN control Tracking Generator Views Adjustment and Test Point Locations Figure 8 6 Tracking Generator Spectrum Analyzer Simplified Block Diagram 8 10 11 6625 286614 amp TM 11 6625 2866 14 amp P Service 0 1 36Hz 0 to 10 dBm DEVICE Q UNDER TEST 8444A TRACKING GENERATOR 0 1 3 GHz AUX a 1 UIPU 50 19 3585 ISOLATOR 2 0 3 4 GHz ISOLATOR SECOND eT 05 3 An BANDPASS CONVERTER FILTER ceQ oe 2648 ALC Q DETECTOR r Qo FIRST LO RF lt Q 85548 SPECTRUM ANALYZER SYSTEM OUTPUT RF INET 4 1 Wis FIRST LO 4 QUTPUT wis 500 3 THIRD 10 MHz 1 55 GHz 2 MHZ 1 SOLATOR OSCILLATOR wig SCAN IN OUT DEVICE UNDER TEST 1 55 6H i Y o gt fe 500 MHZ 2 05 GHz AC wi 500 MHz 1 dBm FIRST Q gt CONVERTER DCAMPL DIODE SIGNAL LEVEL CONTROL RF DIODE 8555A SPECTRUM ANALYZER SYSTEM 2 05 4 GH EXT MIXER SIGNAL 15 m 0 1 3 GHz 6 0 to 10 dam lt INIOUT
109. for the 8444A Option 058 D 6 TM 11 6625 2866 14 amp P Model 844A 500 MHz OUTPUT THIRD LO INPUT 15 230V 108 24 440 10 outros OM Om t aus f output e THEE LO INPUT Se D S C THOMA 230v n9 60 When using the 8444A with an 8558B 180 Spectrum Analyzer the 8444A 500 MHz OUTPUT and its THRID LO INPUT must be interconnected with a short cable Figure D 2 Location of 500 MHz LO OUTPUT BNC Connector Added on Rear Panel of the 8444A Option 058 D 7 11 6625 2866 14 amp P Model 844A Al POWER SUPPLY ASSY A9 500 MHz OSCILLATOR ASSEMBLY 08444 66024 REFERENCE DESIGNATIONS WITHIN OUTLINED ASSEMBLIES ARE ABBREVIATED FULL DESIGNATION IN CLUDES ASSEMBLY NUMBER e g OF ASSEMBLY AI DESIGNATIONS OF OTHER COMPONENTS ARE COMPLETE 5 SHOWN REFERENCE DESIGNATIONS NO PREFIX 9 1 Figure D 3 9 500 MHz Oscillator Assembly Schematic DA Pam 310 4 DA Pam 310 7 TB 43 0118 TM 38 750 TM 750 244 2 TM 11 6625 2886 14 amp P APPENDIX E REFERENCES Index of Technical Manuals Technical Bulletins Supply Manuals Types 7 8 and 9 Supply Bulletins and Lubrication Orders US Army Equipment Index of Modification Work Orders Field Instructions for Painting and Preserving Electronics Command Equipment Including Camouflage Pattern Painting of Electrical Equipment Shelters The Army Maintenance Management System
110. hrough a second diode in the level detector circuit to the modulator driver The level of the reference signal and the ALC circuitry is adjusted to provide an output level of 0 to 10 dBm 0 LEVEL CONTROL CIRCUITRY The level control circuit is a resistive divider network that establishes the level of the reference diode signal The front panel LEVEL control adjusts the reference signal level to the ALC circuitry to provide control of the RF output level range of 0 to 10 dBm Refer to paragraph 5 13 for calibration of the 0 and 10 dBm points TROUBLESHOOTING PROCEDURE Except for the ALC level control circuitry refer to Service Sheet 2 for troubleshooting procedure EQUIPMENT REQUIRED Spectrum Analyzer System HP 8554B or 8555A System Digital Voltmeter 2 HP 34440A 34443A 8 16 TM 11 6625 286614 amp P SERVICE SHEET 4 cont d B B See Service sheet 2 Perform Preset Adjustment Procedures paragraph 4 7 4 9 Spectrum Analyzer SCAN WIDTH to ZERO Set Tracking Gen LEVEL to 0 dBm Measure voltage level at junction of the 958 98 948 wires with the connection pins of the assembly Levels shou within 50 mVdc of the level listed below LEVEL 958 98 948 0 dBm 50 mVde 240 mVde 350 mVde 10 dBm 0 mVdc 300 mVdc 400 mVdc Note voltage drop across reference diode Typically 300 1 voltage levels are not within 50
111. ial should be retained for possible future use 2 4 Electrical Check 2 5 The electrical check consists of following the performance test procedures listed in Section IV These procedures allow the operator to determine that the instrument is or is not operating within the specifications listed Table 1 1 The initial performance and accuracy of the instrument are certified as stated on the inside front cover of this manual If the instrument does not operate as specified refer to paragraph 2 6 for the recommended claim procedure 2 6 CLAIMS FOR DAMAGE 2 7 f physical damage is found when the instrument is unpacked notify the carrier and the nearest Hewlett Packard Sales and Service office immediately The Sales and Service office will arrange for repair or replacement without waiting for a claim to be settled with the carrier 2 8 The warranty statement for the instrument is on the inside front cover of this manual Contact the nearest Sales and Service office for information about warranty claims 2 9 PREPARATION FOR USE CAUTION Before applying power check the power selector switch on the Tracking Generator input power module rear panel for proper position 115 or 230 volts 2 1 2 10 Power Requirements 2 11 The Tracking Generator can be operated from a 48to 440 hertz input line that supplies either 1150 230 volt 41096 in each case power Consumed power is normally less than 15 watts 2 1
112. icates the National stock number assigned to the item and which will be used for requisitioning c Description Indicates the Federal item name and if required a minimum description to identify the item part number indicates the primary number used by the manufacturer which controls the design and characteristics of the item by means of its engineering drawings specifications standards and inspection requirements to identify an item or range of items Following the part number the Federal Supply Code for Manufactures SCM is shown in parentheses d Location The physical location of each item listed is given in this column The lists are designed to inventory all items in one area of the major item before moving on to an adjacent area e Usable on Code Not applicable f Quantity Required Qty Reqd This column lists the quantity of each item required for a complete major item g Quantity This column is left blank for use during an inventory Under the Revd column list the quantity you actually receive on your major item The Date columns are for your use when you inventory the major item Next printed page F 2 1 11 6625 2866 14 amp P SECTION II INTEGRAL COMPONENTS OF END ITEM 1 2 3 4 5 6 o ILLUSTRATION NATIONAL DESCRIPTION LOCATION USUABLE QTY QUANTITY B STOCK ON REQD FIG ITEM NUMBER PART NUMBER CAGE CODE RCVD DATE 6625 00 185 4802 T
113. ight division display 9 Refer to Figure 4 3 Tune Test Analyzer FINE TUNE so that the upward slope of the display intersects the CENTER FREQUENCY graticule line one division from the top NOTE The linear portion of the analyzer IF filter skirt is used to slope detect low order residual FM The analyzer is stabilized and the detected FM is displayed in the time domain 10 Note where the slope intersects the middle horizontal HORIZONTAL graticule line Horizontal Displacement divisions DISPLACEMENT TII um Y 11 Use the horizontal displacement to calculate demodulation sensitivity E E a Convert the horizontal displacement divisions into Hertz Example 2 kHz SCAN WIDTH x 0 2 E Ml div 400 Hz eitis Figure 4 3 Demodulation Sensitivity Measurement b Calculate demodulation sensitivity by dividing the vertical displacement in divisions into the horizontal displacement in Hz 400 Hz Example 133 Hz div 3 divisions 12 Turn SCAN WIDTH to ZERO scan Set FINE TUNE for a response level within the calibrated three division range one division from the top to the center horizontal graticule line 13 Measure the peak to peak deviation and multiply it by the demodulation sensitivity obtained in step lib above 14 Example 1 2 div p p signal deviation x 133 Hz div 2 159 6 Hz Residual FM Hz peak to peak 4 8 TM 11 6625 2866 14 amp P Model 8444A PERFORMANCE TESTS 4 18 SYSTEM F
114. ignals using Tracking Generator AUX RF OUTPUT and an external frequency counter DESCRIPTION The accuracy of the slide rule dial is determined by the RF Section calibration Refer to dial accuracy performance test in the appropriated RF Section Operating and Service manual For precision frequency measurements frequency accuracy is checked by tuning the Spectrum Analyzer and Tracking Generator to a known frequency and measuring the Tracking Generator output with an external counter The slide rule dial can be visually checked for an accuracy of 15 MHz rano Lol faux La p Neut LOUTPUT y BNC CABLE FREQUENCY COUNTER Rf OUTPUT STEP 13 EQUIPMENT HP 8554 8555 8552 141 Frequency 5340 Test OSMO esa HP 652A HF Signal Generato oo ooo UD i nou no p oo R ORE HP 606 Signal Generator la HP 608E F WHE Signal Generator siepe DP HP 612A HI 0 773 HP 10503A PROCEDURE 1 Perform preset adjustment procedures paragraph 4 7 8554B 8552B 141T Spectrum Analyzer System or for 8555A 8552B 141T Spectrum Analyzer System 2 Connect test setup as indicated in Figure 4 5 and make the following control settings Spectrum Analyzer See paragraph 4 7 04 9 Frequency Counter SAMPLE RATE aiam e e Pr rk ERE eV a 12 o clock SENSITIVITY Gree re rrr a a 1 VOLTS RMS
115. ilable from the 8558B but no 500 MHz LO is used in this instrument Option 058 consists of a 500 MHz oscillator for the 8444A This 500 MHz signal is brought out on a separate BNC connector on the rear panel of the 8444A directly above the THIRD LO INPUT BNC connector When the 8444A is used with an 8558B 180 Spectrum Analyzer system the two rear panel BNC connectors are interconnected with a short BNC cable With the First LO from the 8558 B plus its own 500 MHz LO signal the 8444A can provide a 0 5 to 1300 MHz tracking signal for the 8558B Spectrum Analyzer system D 6 MANUAL CHANGES TO INCORPORATE OPTION 058 D 7 Section D 8 84444 System Specifications with Option 058 added are listed in Table D 1 Table D 1 8444A System Specifications with Option 058 SPECIFICATIONS These specifications apply to the 8444A Option 058 when used with the 8558B Spectrum Analyzer ONLY Specifications of the 8444A Option 058 when used with the 85548 and 8555A Spectrum Analyzers can be found in Table 1 1 of the 8444A manual Swept Frequency Response Measurements Absolute Amplitude Calibration Range Dynamic Range 90 dB from Spectrum Analyzer 1 dB Spectrum Analyzer gain compression point to average noise level approxi mately 10 dBm to 100 dBm Log From 117 dBm to 30 dBm 10 dB div on a 70 display or 1 dB div on an 8 dB display Average Noise Level 107 dBm with 10 kHz Resolution Linear From 2 2 uV 100 dBm to 7 1V 30 bandwidth dBm
116. in the same manner as the driver and limiter in the pus supply TROUBLESHOOTING PROCEDURE Before troubleshooting thie power supplies disconnect the 20 volt re 2 wire from the Amplifier and ALC Detector Assembly A3 When a malfunction has been isolated tb the power supply or line input circuits or to isolate a malfunction in t e circuits perform the following procedure A2 A3 A6 AT1 AT2 FL1 Second Converter Circuits Schematic Diagram SERVICE SHEET 4 Service TM 11 6625 2866 14 amp P SERVICE SHEET 5 cont d EQUIPMENT REQUIRED Volt Ohm Ammeter eens HP 412A Digital Voltmeter 3440A 8443A input circuit Check the input circuits against the wiring diagram and schematic diagram 20 VOLT SUPPLY Tum LINE ON OFF switch to OFF Remove top cover and disconnect the 20 volt red wire from microcircuit Check fuses A1F1 and F2 If fuse 1 1 is blown check power transistor Q1 for a short If fuse A1F2 is blown check power transistor Q2 for a short After replacing fuse apply power and check voltage at 1 for 20 volts If the voltage level is between 10 and 15 Vde troubleshoot operational amplifier 101 para graph 8 30 and associated circuitry If the voltage output is less than 1 volt remove silicon controlled rectifier A1CR10 If the output of both sup plies is normal check AICR8 AICR9 and A1Q5 removing A2 assembly for access t
117. indicated category of maintenance f the number or complexity of the tasks within the listed maintenance function vary at different maintenance categories appropriate work time figures will be shown for each category The number of taskhours specified by the work time figure represents the average time required to restore an item assembly subassembly component module end item or system to a serviceable condition under typical field operating conditions This time includes preparation time troubleshooting time and quality assurance quality control time in addition to the time required to perform the specific tasks identified for the maintenance functions authorized the maintenance allocation chart Subcolumns of column 4 are as follows C Operator Crew O Organizational F Direct Support D Depot e Column 5 Tools and Equipment Column 5 specifies by code those common tool sets not individual tools and special tools test and support equipment required to perform the designated function f Column 6 Remarks Column 6 contains an alphabetic code which leads to the remark in section IV Remarks which is pertinent to the item opposite the particular code H 4 Tool and Test Equipment Requirements Sec Ill a Tool or Test Equipment Reference Code The numbers in this column coincide with the numbers used in the tools and equipment column of the MAC The numbers indicate th
118. ine and ground For easiest installation connect the capacitor between connector pins XA2 1 and XA2 7 Pin 1 is located nearest the instrument front panel APPENDIX B SERVICE NOTE P 08444 60019 HP MODEL 8444A TRACKING GENERATOR Serials Prefixed 1147A and Below REPLACEMENT FOR A7 08444 60003 The HP Part No 08444 60019 assembly is the recommended replacement for the old 08444 60003 A7 assembly Since the old and new A7 assemblies are not directly interchangeable minor modifications required when installing the new A7 The additional parts required for the modification are one each HP 0757 0438 5 11K 1 1 8 W Resistor HP 0757 0439 6 81K 1 1 8 W Resistor HP 0757 0465 100K 1 1 8 W Resistor HP 8150 0449 30 Red No 24 AWG Wire MODIFICATIONS 1 A7 hookup refer to Figures 8 12 and 8 19 a Connect the wht brn wire to new A7C4 b Add red wire connect between 20V XA1 6 and A7C2 1 2 c Connect violet and wht blk violet wires to 7 2 Component changes Add R5 5 11K 0757 0438 between connector pins XA2 10 and unused XA2 12 then short pins XA2 12 and XA2 11 10V together b Replace A2R29 with 100K 0757 0465 c Replace A2R36 with 6 81K 0757 0439 CALIBRATION To calibrate the new A7 assembly follow the 1 55 GHz Oscillator Power Level Frequency Check and Adjustment 5 3 15 5 11 6625 2866 14 amp P 8444 APPENDIX C SERVICE NOTE
119. ing Dimensions in Inches 8 14 Modulator Oscillator Driver Assy A2 Component Locations 8 15 Amplifier and Pin Diode Modulator Assy A4A1 Component Locations 8 15 First Converter Circuits Schematic Diagram J1 RF Output Connector Exploded View 8 16 8 14 A2 Modulator Oscillator Driver Assy Component Location 8 15 Second Converter Circuits Schematic Diagram 8 16 Al Power Supply Assy Component Location 8 19 Power Supply and Input Circuit Schematic Diagram 8 19 First Converter Assembly Illustrated Parts Breakdown 8 19 JA71 55GHz Oscillator Assembly Illustrated Parts Breakdown 500 MHz LO Mounting Location and Output Port for the 8444A Option 058 Location of 500 MHz LO OUTPUT BNC Connector Added on Rear Panel of the 8444A Option 058 D 7 A9 500 MHz Oscillator Assembly Schematic D 8 TM 11 6625 2866 14 amp P Contents Table Page Table Page 1 1 System Specifications 1 3 Accessories 1 4 Manual Changes by Serial Number 7 1 Test Equipment and Accessories 1 5 8 1 Factory Selected Components 8 2 Operating Accessories 1 7 Adjustable Components 8 2 4 T
120. ing the part number in the replaceable parts table in Section this manual Virtually all orders for replacement parts received by HP offices are shipped the same day received either from the local office or from a Service Center 8 14 Factory Selected Components Some component values are selected at the time of final checkout at the factory Usually these values are not extremely critical they are selected to provide optimum compatibility with associated components These components which are identified on the schematics with an asterisk are listed in Table 84 The recommended procedure for replacing a factory selected component is as follows a Try the original value then perform the test specified in of this manual for the circuit being repaired b If the specified test cannot be satisfactorily performed try the typical value shown in the parts list and repeat the test c If the test results are still not satisfactory substitute various values until the desired result is obtained 8 15 Adjustable Components Adjustable components other than front panel operating controls are listed in Table 8 2 Adjustment procedures for these components are contained irj Section V of this manual 8 16 Servicing Aids on Printed Circuit Boards Servicing aids on printed circuit boards include test points transistor designations adjustment callouts and assembly part numbers with alpha numerical revision information 8 17 Pa
121. ith 8555A 16 calibrated scan widths from a 2 kHz div to 200 MHz div in a 2 5 10 sequence With 8554B 15 calibrated scan widths from a 2 kHz div to 100 MHz div in 2 5 10 sequence Full Scan 0 1250 MHz with 8554B 0 1300 MHz with 8555 Zero Scan Analyzer is fixed tuned receiver Frequency Resolution 1 kHz Stability Residual FM peak to peak Tuning Section Stabilized 8554B 8555A 200 Hz Unstabilized 10 kHz Amplitude Accuracy System Frequency Response 1 5 dB Tracking Generator Calibration 0 dBm at 30 MHz to 0 5 dB SWEEP CW GENERATOR The tracking generator spectrum analyzer system can be used to supply test signals for other devices as a sweeper Frequency Controlled by spectrum analyzer Range is 500 kHz to 1250 MHz with the 8554B and 10 MHz to 1300 MHz with the 8555A Frequency Accuracy 10 MHz 8554B 15 MHz 8555 using Spectrum analyzer tuning dial Can be substantially improved using external counter output Spectral Purity Residual FM peak to peak Tuning Section Stabilized Unstabilized 8554B 8555A 200 Hz 10 kHz Harmonic Distortion 25 dB below output level Nonharmonic spurious Signals gt 40 dB below output level Flatness 0 5 dB Long Term Stability Drift typically less than 30 kHz hour when stabilized after 2 hour warmup Sweep Width 20 kHz to 1250 MHz 8554B or 1300 MHz 85554 Sweep Rates Selected by Scan Time per Division on spectrum analyzer 16 internal scan r
122. itial turn on driver transistor A1Q3 and current source A1Q1 Q2 provide 14 5 volt sign a to the base of Q1 resulting in an output of approximately 13 8 volts Thie low output voltage is sensed by sense amplifier 1071 which then provid es the additional turn on signal to driver A1Q3 Adjustment of the 20 vol t output is provided by VOLTS adjustment 41814 Fold back current niting is provided by A1Q4 with over current protection provided by 1171 Over voltage for both the 20 and 10 volt supplies is provided by crow bar circuit consisting of AICR8 CRIO and 195 Should eitkicr supply exceed the breakdown voltage of the diodes the silicon controlle d rectifier is triggered on shorting the output of both supplies together AICR6 and provide reverse voltage protection AIR9 and tlhe front panel MANUAL SCAN control R1 provide the 0 to 10V for MANUAL SCAN operation 10 VOLT POWER SUPPLY The 10 volt supply consists of bridge ectifier AICR12 CR15 filter C2 series series regulator Q2 driver 197 fcild baek current limiter 196 and sense amplifier A1U2 The unregulated output of the bridge rectifier is filtered by C2 and regulated by Q2 20 volts from the positive supply provides the reference for the sense arhplifier A1U2 Precision resistors between the 20 volts and the 10 sense line reference the negative supply to the positive supply The driver and cu irent limiter function
123. king Generator Spectrum Analyzer did not perform as called out in the Preset Adjustment Procedure in Paragraph 4 7 or 4 9 Set Tracking Generator controls as follows BINED 2 netur oe Beatie Ou ON MANUAL SC CCW TRACK ADJ Centered LEVEL 5522 SOS OdBm Remove top cover and check 20 and 10 volt power supplies at feedthru capacitors ASC and 4 2 Check for a level of 420 Var 220 mV and 10 305 Vde set controls as follows RF Section only 10 33 dBm 15 dBm Record power level Apply power to the Spectrum Analyzer System and Disconnect cable between FIRST LO OUTPUT and FIRST LO INPUT at the Tracking Generator Using the BNC adapter 10 dB attenuator thermistor mount and power meter check for a first LO power level of Reconnect first LO cable Disconnect third LO cable at THIRD LO INPUT Check third LO input for a power level of at least 0 dBm Record power level YES BAND reb 25 GHz IFI FREQUENCY 500 Mhz BANDWIDTH 300 kHz SCAN WIDTH msi BEAD SCAN WIDTH PER DIVISION INPUT ATTENUATION TUNING STABILIZER SIGNAL IDENTIFIER BASE LINE CLIPPER VIDEO FILTER SCAN TIME PER DIVISION LOG LINEAR 10d8 LOG LOG REF LEVEL 1688 LOG REF LEVEL Vernier SCAN MODE cesses SCAN TRIGGER AUTO dim
124. ls should not differ more than 10 mV and should be approximately 0 Vde If voltage levels are correct adjust A2R27 MIN TUNE for a voltage level of 6 1 Vde at pin 6 1f the voltage levels are not correct and or the MIN TUNE control has no effect on the output level replace 21 Remove jumper from between A2R32 U1 pin 6 and A2TPS Compare voltage levels at the emitter base collector of A2Q8 To check driver voltage gain adjust TRACK ADJ for 1 00 at Measure level at A2TPS The level at A2TP5 should change from 2 to 5V for a 4 ME oscillator variation After repairs have been made connect 91 wire to ATC2 and perform adjustment procedures listed in paragraph 5 9 T Figure 8 9 Mixer Diode Forming Model 84444 Figure 8 10 Modulator Oscillator Driver A2 1 acatinns Figure 8 11 Amplifier and Pin Diode Modulator Assy A4A1 Component Locations THIRD i0 INPUT Pl LU al fj qm 1 Re 5 CO nomas ASSY Ad MHZ AMPUPIN 20 MODULATOR ASSY ALMA DN i Am RIL 159800 UT COMPLETE 4 SHOWN AV TM 11 6625 2866 1 4 amp P FIRST CONVERTER ASSY A5 08444 60011 ol En 11 17 L 1
125. lyzer Operational Adjustments 30 MHz Calibration Refer to 0555 A RF Section Operating and Service Manual e Connect Spectrum Analyzer FIRST LO OUTPUT Tracking Generator FIRST LO INPUIT f Connect Spectrum Analyzer THIRD LO OUTPUT to Tracking Generator THIRD LO INPUT rear panel connections g Connect Tracking Generator RF OUTPUT to Spectrum Analyzer INPUT h Connect racking Generator SCAN OUTPUT to PUT to Spectrum Analyzer SCAN IN OUT i Set Spectrum Analyzer controls as follows INTENSIT 22 02 12 o clock approx BAND 1 2 05 GHz IF FREQUENCY 30 MHz BANDWIDTH 22222 300 2 SCAN WIDTH esee PER DIVISION SCAN WIDTH PER DIVISION 100 kHz INPUT ATTENUATION mmA 8e 20dB TUNING STABILIZER ON SIGNAL IDIENTIFIER OFF BASE LINE CLIPPER CCW SCAN TIME PER DIVISION 10 MILLISECONDS LOG LINEAR 10 dB LOG LOG REF LEVEL emen 0 dBm LOG REF LEVEL Vernier 2 0 VIDEO FILTER essen OFF SCAN MODE 1 essere INT SCAN TRIGGER LINE or AUTO j Set Tracking Generator controls as follows 4 2 TM 11 6625 2866 14 amp P Performance Tests MANUAL SCAN CCW LEVEL Adjust TRACK ADJ control for maximum aptitude of trace on CRT display trace is no
126. me second plane angle slow blow fuse used in parts list silicon controlled rectifier screw selenium sections semicon RWV SEMICON ductor superhigh fre silicon signal to noise ratio single pole double throw spring split ring single pole single throw single sideband stainless steel standing wave ratio synchronize timed slow blow fuse temperature compensating NOTE All abbreviations in the parts list will be in upper case MULTIPLIERS Abbreviation Multiple tera giga mega kilo deka deci centi milli micro nano pico femto atto time delay terminal thin film transistor toggle thread through titanium tolerance trimmer transistor transistor transistor television television interference traveling wave tube micro 10 used in parts list microfarad used in parts list ultrahigh frequency unregulated volt voltampere volts ac variable voltage controlled oscillator UHF volts dc working used in parts list volts filtered variable frequency oscillator VHF very high fre VFO 5 volts peak Vp p volts peak to peak Vrms volts rms VSWR voltage standing wave ratio voltage tuned oscillator vacuum tube voltmeter volts switched working inverse wirewound without yttrium iron garnet characteristic impedance 11 6625 2866 14 amp Model 8444A Re
127. move right side panel cover Unsolder and remove power wires from A7C2 and A7C3 Adjust Power Supply for 10 and 10 volts Connect 10 volts to A7C3 and 10 volts to A7C2 Connect Power Supply ground to solder lug near A7 Oscillator Assembly Model 8444A 5 9 25 26 27 28 29 30 31 32 11 6625 2866 14 amp Manual Changes 1 55 GHz Oscillator Power Level Frequency Check and Adjustment cont d Adjust Power Supply negative voltage for maximum oscillator power level as indicated on Power Meter Record power level gt 7 dBm If power level is less than 7 dBm replace Oscillator Assembly A7 If power level is greater than 7 dBm reduce negative voltage from Power Supply to 10 volts a If output level drops 2 dB go to step 30 b If output level drops less than 2 dB go to step 28 output level drops more than 2 dB go to step 29 Increase Power Supply positive voltage approximately 0 5 volts and repeat steps 25 through 27 Decrease Power Supply positive voltage approximately 0 5 volts and repeat steps 25 through 27 Record positive voltage obtained in steps 24 28 or 29 on label on top of oscillator assembly Repeat steps 14 through 22 Disconnect Power Meter and connect W8 Cable to Isolator J2 33 Replace right side panel cover througl 6 5 Table 6 2 change to read as follows A2R29 0698 0465 R FXD MET FLM 31 6 OHM 196 1 8W A2R36 0757 0442 FXD MET FLM 10K OHM 1 1 8W A4A1C2 0160
128. n 500 MHz signal by the PIN diode attenuator from affecting the 500 MHz scillator in Spectrum Analyzer PIN diodes A1CR1 and CR2 function as aries connected current controlled microwave resistors As curent through diodes increases the amount of attenuation decreases Current through re PIN diodes is controlled by ALC circuitry and the output of Modulator driver Assy is a limiter resistor to protect the PIN diodes in ase of an accidental short to the line from the modulator driver MODULATOR DRIVER modulator driver consists of differential amplifier A2Q1 through Q3 miter A2Q4 and output amplifier A2Q5 through Q7 The difference elween the rf diode and the reference diode signal from the ALC circuitry 1 the microctrcuit amplifier is amplified by 4201 The output of A2Q1 is mplified by the output amplifier 3205 through Q7 to control the current o the PIN diode modulators FIRST CONVERTER A5 he first converter mixes the signal from the 500 MHz Amplifier PIN Diode fodulator with the signal from the 1 53 GHz Oscillator The converter con ists of a 500 MHz bandpass filter diode mixer and three radial cavities One avity functions as a bandpass filter for the 1 55 GHz oscillator signal The ther cavities function as an IF filter and provide a two pole Butterworth esponse Both the IF and LO input cavities ate adjustable by tuning slugs mixer is a single Schottky diode located between the 1 55 GHz iscilla
129. ncy measurements at any point on the CRT display With the counter connected to the Tracking Generator AUX RF OUTPUT jack rear panel and the system operated in the MANUAL SCAN mode the scan can be stopped at any point for frequency measurement CAUTION Do not leave System stopped in MANUAL SCAN with high INTENSITY Damage to the display CRT can result Model 8444A Figure 3 10 illustrates frequency measurement at the 30 dB point on a low pass filter a Spectrum Analyzer 8554B control settings FREQUENCY 2 2 50 MHz BANDWIDTH 300 kHz SCAN WIDTH PER DIVISION 10 MHz INPUT ATTENUATION nenne 10dB SCAN TIME PER DIVISION 10 MILLISECONDS ce 0 dBm LOG VIDEO FIETER peat An etti etu uti OFF INT SCAN TRIGGER att atte a tu AUTO b Tracking Generator control settings AGI LEVEL 0 MANUAL SCAN daa CCW c Connect unit under test between Tracking Generator RF OUTPUT and Spectrum Analyzer RF INPUT d Connect Tracking Generator AUX RF OUTPUT to Frequency Counter input e Connect Tracking Generator SCAN OUTPUT to Spectrum Analyzer SCAN IN OUT f Connect Tracking Generator FIRST LO INPUT to Spectrum Analyzer FIRST LO OUTPUT and THIRD LO INPUT to THIRD LO OUTPUT 3 10 TM 11 6625 2
130. ne voltage Refer td Figure 3 2 LOG REF LEVEL Vernier 0 steps 4 through 8 for switch and fuse information VIDEO FI WE M OFF SCAN essere INT 2 Apply power to Tracking Generator and Spectrum SCAN TRIGGER LINE Analyzer 3 Turn Spectrum Analyzer INTENSITY control fully CCW 4 Allow instruments to warm up for at least 30 minutes 5 Perform Spectrum Analyzer Calibration Procedure Refer to 8554B RF Section Operating Manual 6 Set Spectrum Analyzer LOG LINEAR control to LOG LOG REF LEVEL to 0 dBm and BANDWIDTH to 300 kHz 7 Make the following interconnections between Tracking Generator and Spectrum Analyzer a FIRST LO INPUT to FIRST LO OUTPUT b THIRD LO INPUT to THIRD LO OUTPUT c RF OUTPUT to RF INPUT d SCAN OUTPUT to SCAN IN OUT 8 Check that the Spectrum Analyzer controls are set as follows INTENSITY vicariaat 12 o clock approx ott 30 MHz BANDWIDTH 300 2 SCAN WIDTH PER DIVISION 50 kHz INPUT ATTENUATION n 10 dB TUNING STABILIZER On BASE LINE CLIPPER _ CCW SCAN TIME PER DIVISION 5 MILLISECONDS LOG LINEA R LOG 9 Set Tracking Generator LEVEL control to 0 dBm and 10 11 12 13 14 15 16 adjust TRACK ADJ for maximum signal amplitude indication on CRT display Adjust Spectr
131. ng the adjustment procedure In addition to providing the third LO input signal the output signal can be displayed during the adjustment With the analyzer operating in the linear mode the cavities are alternately adjusted for maximum indication on the CRT When only the 8554L Spectrum Analyzer System is available the output can be monitored using a power meter such as the HP 432B CABLE ASSEMBLY SPECTRUM ANALYZER UG 201A U Figure 5 5 First Converter Check and Adjustment Test Setup EQUIPMENT Spectrum IEEE HP 8555A 8552 141T able ASSOmDIV 0 HP 11592 60001 eee en ee te Ter eT ee A UG 201A U WV TSUN CM 5 16 inch 10 PROCEDURE 1 Perform 1 55 GHz Oscillator Power Level Frequency Check and Adjustment paragraph 5 9 2 With test setup as indicated in Figure 5 5 set controls as follows Tracking Generator LINE iced ON TRAGK qp Centered LEVE 0 Spectrum Analyzer Lupe n 1 2 05 GHz IF FREQUENCY 500 MHz BANDWIDTH 100 2 SCAN WIDTH PER DIVISION 44 5 MHz INPUT ATTENUATION 20 SCAN TIME PER DIVISION 20 MILLISECONDS LOG REF LEVEL 10 dBm LOG LINEAR 10 dBLOG 11 6625 2866 14 amp
132. normally the highest degree of maintenance performed by the Army Overhaul does not normally return an item to like new condition k Rebuild Consists of those services actions necessary for the restoration of unserviceable equipment to a like new condition in accordance with original manufacturing standards Rebuild is the highest degree of materiel maintenance applied to Army equipment The rebuild operation includes the act of returning to zero those age measurements hours miles etc considered in classifying Army equipments components H 3 Column Entries a Column 1 Group Number Column 1 lists group numbers the purpose of which is to identify components assemblies subassemblies and modules with the next higher assembly b Column 2 Component Assembly Column 2 contains the noun names of components assemblies subassemblies and modules for which maintenance is authorized c Column 3 Maintenance Functions Column 3 lists the functions to be performed on the item listed in column 2 When items are listed without maintenance functions it is solely for purpose of having the group numbers in the MAC and RPSTL coincide d Column 4 Maintenance Category Column 4 specifies by the listing of a work time figure in the appropriate subcolumn s the lowest level maintenance authorized to perform the function listed in column 3 This figure represents the active time required to perform that maintenance function at the
133. nt has a test setup drawing and a list of required equipment Each procedure gives control settings required for that particular test 11 6625 2866 14 amp P Model 8444A Performance Tests 4 15 Required minimum specifications for test Tracking Generator substitute test equipment is used it specifications listed in order to performance test must meet the equipment are detailed in able 1 3 infection If the PERFORMANCE TESTS 4 16 Output Level SPECIFICATION Tracking Generator Drive Level to Test Device 0 to 10 dBm continuously variable 0 dBm calibrated to 0 5 dB Flatness 40 5 dB DESCRIPTION With the Tracking Generator connected to the Spectrum Analyzer the Tracking Generator output level is first checked at 30 MHz Spectrum Analyzer amplitude calibration point with a power meter With Tracking Generator LEVEL control set at 0 dBm the power meter indication should be 0 dBm 0 5 dB With LEVEL control set fully counterclockwise the power meter indication should be 10 dBm to 12 dBm The flatness of the Tracking Generator output is checked using a power meter from 10 MHz to 1 3 GHz if used with the 8555A and 500 kHz to 1 25 GHz if used with the 8554B The overall maximum power variation in each case must not exceed dB 0 5 dB l Rio FREQUENCY COUNTE POWER METER THIRD LO NPU eer MAU INTERCONNECT L OUTPUT _ TUE CABLE POWER 08444 60017 HP 8444A SENSOR 8555A
134. o 1 components Also check for short circuit extemal to the power supply and for a shorted 1 5 Check A1C5 by measuring voltage drop across A1R10 It should be 0 Vdc 100 mV drop indicates a shorted capacitor A1C5 If the output voltage is over 20 volts and cannot be cor rected with the VOLTS adjustment ATR14 ground anode of 1 5 and check for an output level of 10 to 15 volts indicating associated circuitry 15 functioning properly If it is outside this range check emitter base voltages 101 192 and 193 Remove ground from anode of AICR5 and perform adjustment procedures in paragraph 5 8 Troubleshoot the 10 volt supply in a similar manner Check input to operational amplifier remove Q2 and check voltage at emitter of 197 remove 107 and repeat voltage measurement at emitter of 07 Check 109 for shoxt 8 18 TM 11 6625 286614 amp P Model 8444 11 6625 286614 amp Model 8444 11 6626 2866 14 amp P Service LINE ON OFF SWITCH AND POWER LINE MODULE WIRING 92 40 VOLT POWER SUPPLY ASSY AL 08444 60001 SON MANUAL n T Ost POWER LINE MODULE A8 D fi TY Uy 318 ux OER INPUT g N P
135. o 3 4 GHz frequency range Signals outside the bandpass frequency range are attenuated SECOND CONVERTER ASSY The second converter consists of stripline circuitry and a pair of hot carrier diodes The second converter mixes the 2 to 3 4 GHz LO signal with the 2 05 GHz first converter output signal to produce a 0 to 1 35 GHz signal that tracks the tuning of the LO input signal Conversion loss in the second converter is typically 7 dB The converter assembly is a sealed unit and should be repaired by replacing the entire A6 Assembly AMPLIFIER AND ALC DETECTOR ASSEMBLY A3 The amplifier and detector assembly contains large scale integrated LSI circuits consisting of 3 dB attenuator 1 3 GHz low pass filter wideband amplifier a level detector circuit a 1 4 GHz low pass filter and a dc blocking capacitor The 0 to 1 35 GHz signal from the second converter is applied through a 3 dB attenuator for impedance matching and a 1 3 GHz low pass filter to the wideband amplifier The amplifier provides approximately 26 dB gain over the frequency range of 500 kHz to 1 3 GHz The output of the wideband amplifier is applied through a level detector circuit and a 1 4 GHz low pass filter to the RF output connector The level of the RF output is sampled and applied to the modulator PIN diode driver as the RF diode signal A reference signal controlled by the front panel LEVEL control and the internal 0 and 10 dBm adjustments is applied t
136. of amplifiers Basic transistor operation is shown on the following pages 8 25 Transistor In Circuit Testing The common causes of transistor failure are internal short circuits and open circuits transistor circuit testing the most important consideration is the transistor base to emitter junction The base emitter junction in a transistor is comparable to the control grid cathode Table 8 4 Etched Circuit Soldering Equipment Soldering tool Soldering Unsoldering Resin flux Remove excess flux from soldered area before applica tion of protective coating Component replacement Circuit board repair Protective Wiring Coating Contamination corrosion protection degrees and Ungar No PL113 1 8 inch chisel tip Krylon Inc Norristown Pennsylvania Wattage rating 47 2 56 Tip Temp 850 900 degrees Soldering Tip Soldering Shape pointed Ungar No PL111 Unsoldering De soldering To remove molten solder from Suction device Aid connection Must not dissolve etched circuit base board material or conduc tor bonding agent lt Resin flux core high tin con tent 60 40 tin lead 18 gauge SWG preferred Good electrical insulation cor rosion prevention properties For working on etched boards for general purpose work use Ungar 1237 Heating Unit 37 5W tip temperature of 750 800 Ungar No 7 76 handle with Ungar No 4037 Heating Unit
137. onductors bonded to both sides of an insulating material The circuit boards can be either a single layer or multi layer board The metallic conductors are extended through the component holes or interconnect holes by a plating process Soldering can be performed on either side of the board with equally good results Table 8 4 lists recommended tools and materials for use in MANUAL SCAN control TRACK ADJ control LEVEL control Sets 20 volt supply level and reference level to 10 volt supply Sets limiting level of PIN diode driver Sets gain of differential amplifier in PIN diode driver circuit Sets PIN diode driver circuit for null Set frequency tuning range of 1 55 GHz oscillator Sets oscillator power level 10 dBm adjustment for LEVEL control 0 dBm adjustment for LEVEL control Adjusts center frequency of 1 55 GHz cavity Adjusts center frequency of 2 05 GHz cavities Adjusts center frequency of 1 55 GHz oscillator cavity repairing etched circuit boards Following are recommendations and precautions pertinent to etched circuit repair work a Avoid unnecessary component substitution it can result in damage to the circuit board and or adjacent components b Do not use a high power soldering iron on etched circuit boards Excessive heat may lift a conductor or damage the board c Use a suction device or wooden toothpick to remove solder from component mounting holes Model 8444A R C L TM 11 66
138. onmouth NJ 07703 In either case a reply will be furnished direct to you This manual is an authentication of the manufacturer s commercial literature which through usage has been found to cover the data required to operate and maintain this equipment Since the manual was not prepared in accordance with military specifications the format has not been structured to consider levels of maintenance 11 6625 2866 14 amp P TABLE OF CONTENTS Section Page Section Page INTRODUCTION 4 0 1 141T 84 44A System L GENERAL 1 1 Preset Adjustments 8555A 8552B Introduction 1 1 141 8444 System Safety Considerations 1 1 Performance 4 2 Instruments Covered by Manual 1 2 4 16 Output 4 3 Description 1 2 Frequency Stability 4 5 8554B RF Section Modifications 1 4 4 18 System Flatness 1 23 Accessories Supplied 1 4 4 19 Frequency 4 11 1 25 Operating Accessories 1 4 4 20 Harmonic Distortion 4 13 1 27
139. ontrol The output level is calibrated at 30 MHz to 0 0 5 dBm and maintained by an automatic level control circuit Refer to Table 1 1 for system performance specifications 1 21 8554L RF SECTION MODIFICATIONS 1 22 Hewlett Packard Model 8554L Spectrum Analyzer RF Section with serial prefixes 1101A and below require modification for Tracking Generator compatibility The modification consists of adding two cables to the RF Section The cables provide front panel access to the first and third LO outputs The modification kit HP Part Number 08554 60056 containing all necessary parts and information is available from any Hewlett Packard Sales and Service Office A list of Sales and Service offices is contained in the back of this manual Service Note 8554L 6 containing the modification procedure is included with the modification kit After modification the Service Note should be filed with the 8554L Service Manual 1 23 ACCESSORIES SUPPLIED 1 24 Accessories supplied with the Tracking Generator are listed in RF cables supplied with the Tracking Generator allow operation with either the 8554B or 8555A Spectrum Analyzer RF Sections The power cable supplied with the instrument is selected at time of shipment Cable selection is based on shipping destination Figure 2 illustrates the different power TM 11 6625 2866 14 amp P General Information cable connectors that are currently available 1 25 OPERATING ACCESSORIES 1 2
140. our used in parts list high voltage Hertz integrated circuit inside diameter intermediate frequency impregnated inch incandescent include s input insulation abbreviations in the parts list will be in upper case integrated circuit microcircuit electron tube voltage regulator breakdown diode cable transmission path wire crystal unit piezo electric or quartz tuned cavity tuned circuit internal kilogram kilohertz kitohm kilovolt pound inductance capacitance light emitting diode low frequency long left hand limit linear taper used in parts list LK WASH lock washer low local oscillator LOG logrithmic taper used in parts list logrithm ic Jow pass filter low voltage meter distance milliampere maximum megohm meg 109 used in parts list MET FLM metal film MET OX metallic oxide MF medium frequency microfarad used in parts list manufacturer milligram megahertz mho minimum minute time minute plane miniature millimeter Model 8444A TM 11 6625 2866 14 amp P Replaceable Parts Table 6 1 Reference Designations and Abbreviations Cont d modulator momentary metal oxide semiconductor millisecond mounting meter indicating device millivolt millivolt ac millivolt dc millivolt peak millivolt peak to peak millivolt rms milliwatt multiplex mylar microampere microfarad microhenry micromho microsecond mi
141. placeable Parts Table 6 2 Heplaceable Parts Reference HP Part Number Qty Description Mfr Mfr Part Number Designation Code A 08444 60001 1 BOARD ASSY POWER SUPPLY 28480 08444 60001 A1C1 0160 3460 2 C FXD CER 0 05 UF 80 207 100VDCW 56289 023 106 L503LS22 CDM A1C2 0180 0116 4 C FXD ELECT 6 8 UF 10 35VDCW 56289 1500685X903582 DYS A1C3 0160 2199 2 C FXO MICA 30 PF 5 300VDCW 28480 0160 2199 A1C4 0180 0228 3 C FXD ELECT 22 UF 105 15VDCW 56289 150D0226X9015B2 DYS A1C5 0180 0116 C FXD ELECT 6 8 UF 10 35VDCW 56289 1500685X903582 DYS A1C6 0160 3460 C FXD CER 0 05 UF 80 203 100VDCW 56289 C023EI1010L503ZS22 CDM A1C7 0160 2199 C FXD 11CA 30 PF 5 300VDCW 28480 0160 2199 A1C8 0180 0228 C FXD ELECT 22 UF 10 15VDCW 56289 1500226X901582 DYS 1 9 0180 0116 C FXD ELECT 6 8 UF 10 35VDCW 56289 1500685X903582 DYS 1 1 1901 0159 8 DIODE SILICON 0 75 400PIV 04713 SR1358 4 A1CR2 1901 0159 DIODE SILICON 0 75A 400PIV 04713 SR1358 4 A1CR3 1901 0159 DIODE SILICON 0 75A 400PIV 04713 SR1358 4 A1CR4 1901 0159 DIODE SILICON 0 75A 400PIV 04713 SR1358 4 A1CR5 1901 0040 5 DIODE SILICON 30MA 30WV 07263 FDG1088 A1CR6 1901 0200 2 DIODE SILICON 100 PIV 3A 02735 1N4998 A1CR7 1901 0200 DIODE SILICON 100 PIV 3A 02735 1N4998 A1CR8 1902 3182 1 DIODE BREAKDOWN SILICON 12 1V 5 28480 1902 3182 A1CR9 1902 3256 1 DIODE BREAKOOWN SILICON 23 78 5 28480 1902 3256 10 1884 0012 1 RECTIFIER SILICON CONTROLLED 2N3528 02735 2N3528 1
142. r a con version loss of 7 dB Output frequency should be 500 MHz the dial accuracy of the RF Section Check cables WIQ and W12 Refer to Service Sheet 3 for Amplifier and ALC Detector A3 troubleshooting procedure Remove jumper from AQTP1 and A2TP2 Perform adjustment procedures in paragraph 5 12 to set NULL adjustment after repairs have been accomplished Refer to Service Sheet 3 for 500 MH Amplifier troubleshooting procedure Refer to Service Sheet 3 for Modulator Driver trouble shooting procedure Tracking Generator Block Diagram with 8555A and 8554B Analyzers SERVICE SHEET 1 Figure 8 7A Troubleshooting Tree NO cable WG to A4J2 and measure power level at A5J3 TM 11 6625 2866 14 amp P Disconnect cable Wd at AT3J2 and measure power level of 1 55 GHz oscillator signal Level should be equal to or greater than dim Refer to paragraph 5 9 for oscillator power level and frequency check and adjustment Refer to Servite Sheet 3 for oscillator troubleshooting procedure Check cable W9 Connect cable W10 to A623 Discon nect cable Wa from 22 Measure power level of 1st LO signal at AT2J2 Typicai signal loss through ATI and AT2 3 48 Check Ist LO signal level through ATI and associated cables Replace defective component TM 11 6625 286614 amp P Model 84444 Disconnect cable W8 at AT3J2 and measure oscillator frequ
143. referenced in the theory of operation test by block numbers 8 5 RECOMMENDED TEST EQUIPMENT 8 6 Test equipment and accessories required to maintain the Tracking Generator are listed in Table 1 3 If the equipment listed is not available equipment that meets the required specifications may be substituted 8 7 TROUBLESHOOTING 8 8 Troubleshooting procedures are divided into two maintenance levels in this manual The first a troubleshooting tree is designed to isolate the malfunction to the defective circuit 8 9 The second maintenance level provides circuit analysis and test procedures to aid in isolating faults to a defective component Circuit descriptions and test procedures for the second maintenance level are located on the pages facing the schematic diagrams The test procedures are referenced to the schematic diagrams by block numbers 8 10 After the cause of a malfunction has been found and remedied in any circuit containing adjustable components the applicable procedure specified in of this manual should be performed After repairs and or adjustments have been made the applicable procedure specified in Section IV of this manual should be performed 8 11 REPAIR 8 12 Factory Repaired Exchange Modules LSI microcircuit Amplifier and ALC Detector Assy A3 is available as a factory repaired exchange module The factory repaired module is available at a considerable savings in cost over the new module 8 1 us
144. rol Fine adjustment Dc Volt Ohm Ammeter Voltmeter HP 412A Volt Ohm A T Voltage Range 1 mV 50 Vde Ammeter Accuracy 1 Input Resistance 10 megohms Ammeter Current Range 1 mA 200 mA Accuracy 2 Ohmmeter Resistance Range 1 ohm 100 megohm Accuracy 5 reading at center scale Flatness 0 2 dB Adapter BNC Tee UG 274B U 1250 0781 Coaxial Attenuator Frequency Range DC 4 GHz HP 8491 Option 10 Adapter BNC Female to Type N Male UG 20 1A U PAT HP 1250 0067 T Cab e Assembly Coaxial cable with Male BNC connectors HP 10503A 48 inches long Cable Assembly Coaxial cable terminated with BNC Male HP 10501A connector and with probe and alligator clip Cable Assembly Coaxial cable terminated with BNC Male HP 10501A connector and alligator clips Cable Assembly Coaxial cable terminated with dual banana 11003A plug and probe with alligator clip Cable Assembly Coaxial cable with dual banana plug and HP 11001A Male BNC connector terminations Cable Assembly SMA Male to BNC Male HP 08555 60076 Cable Assembly Selectro Female to BNC Male Test Cable HP 11592 60001 36 inches Jong Cable Assembly Selectro Female to Selectro Male Test Cable 8 inches long Adapter BNC Jack to BNC Jack HP 11592 60003 UG 914A U HP 1250 0080 P Performance Test A Adjustments T Troubleshooting 1
145. rt Location Aids The location of chassis mounted parts and major assemblies are shown in and 8 5 8 18 The location of individual components mounted on printed circuit boards or assemblies are shown on the appropriate Service Sheet The part reference designator is the assembly designation plus the part designation Example A1RI is R1 on the assembly For specific component description and ordering information refer to the replaceable parts table in Section VI Model 8444A TM 11 6625 2866 14 amp P Service Table 8 1 Factory Selected Components Designation Service Sheet A2R8 AAAIR11 ALC Differential Amplifier PIN Diode Modulator Center GAIN ADJ control Set range of Modulator Table 8 2 Adjustable Components R1 R2 R3 AIR14 20 volt circuit Oscillator driver ALC reference driver 20 volt power supply PIN diode driver PIN diode driver A2R6 A2R7 A2R17 A2R26 PIN diode driver 1 55 GHz oscillator driver A2R27 A2R40 A2R41 A5ADJ 1 A5ADJ 2 3 A7 ADJ 1 1 55 GHz oscillator driver ALC reference diode circuit ALC reference diode circuit First converter First converter 1 55 oscillator 8 19 Diagram Notes Table 8 3 Schematic Diagram Notes provides information relative to symbols and values shown on schematic diagrams 8 20 GENERAL SERVICE HINTS 8 21 The etched circuit boards used in Hewlett Packard equipment are the plated through type consisting of metallic c
146. s not change the transistor has either an emitter collector short circuit or emitter base open circuit 8 27 Transistor and Diode Markings Figure 8 2 illustrates examples of diode and transistor marking methods In addition the emitter lead for bipolar transistors is identified on the printed circuit boards 8 28 OPERATIONAL AMPLIFIERS 8 29 Operational amplifiers are used to provide such functions as summing amplifiers offset amplifiers buffers and power supplies The particular function is determined by the external circuit connections Equivalent circuit and logic diagrams for type 741 operational amplifiers are contained Figure 8 3 Circuit A is a non inverting buffer amplifier with a gain of 1 Circuit B is a non B Transistor Biasing CUTOFF CONDUCTION BASE NPN MAIN CURRENT COLLECTOR V CONTROINS CURRENT EMITTER PNP COLLECTOR EMITTER Figure 8 1 Transistor Operation 8 5 Model 8444A inverting amplifier with gain determined by the resistance of R1 and R2 Circuit C is an inverting amplifier with gain determined by R1 and R2 with the input impedance determined by R2 Circuit D contains the functional circuitry and pin connection information along with an operational amplifier review Note In Circuit D it is assumed that the amplifier has high gain low output impedance and high input impedance FIELD EFFECT TRANSISTORS BLACK EPOXY METAL CA
147. s section Adjustment and test point 5 5 Each check and adjustment procedure contains location illustrations are contained in Figures 8 4 and 8 5 3 The adjustment procedures are arranged in numerical order For best results this order should be followed Record data taken during adjustments in the spaces provided and or in the data test card at the end of this section Comparison of initial data with data taken during periodic adjustments assists in preventive maintenance and troubleshooting Note Control settings are called out for a HP 8555A Spectrum Analyzer RF Section If the RF Section used is a HP 8554B disregard BAND and SIGNAL a list of test equipment required for that particular test contains a tabular list of test equipment and accessories required In addition the table contains the required minimum specifications and a suggested manufacturers model number 5 6 FACTORY SELECTED COMPONENTS 5 T Factory selected components are designated by an asterisk on the schematic diagrams Section VIII of this manual contains a list of factory selected components by reference designation basis of selection and schematic diagram location on which the component is illustrated 11 6625 2866 14 amp Model 8444A Adjustments ADJUSTMENTS 5 8 Power Supply Check and Adjustment REFERENCE Service Sheet 5 DESCRIPTION Power supplies in the Tracking Generator provide regulated output of 20 and 10 volts
148. s the middle horizontal graticule line Horizontal Displacement divisions 15 Use the horizontal displacement to calculate demodulation sensitivity a Convert the horizontal displacement divisions into Hertz Example 2 kHz SCAN WIDTH x 0 2 div 400 Hz b Calculate demodulation sensitivity by dividing the vertical displacement in divisions into the horizontal displacement in Hz 400 H z di Example 133 Hz div 3 divisions 0 2 DIV HORIZONTAL DISPLACEMENT 3 DIV VERTICAL DISPLACEMENT 5 CENTER FREQUENCY Figure 5 4 Demodulation Sensitivity Measurement 16 Turn SCAN WIDTH to ZERO scan Set FINE TUNE for a response level within the calibrated three division range one division from the top to the center horizontal graticule line 17 Measure the peak to peak deviation and multiply it by the demodulation sensitivity obtained in step 15b above Example 0 5 div signal deviation x 133 Hz div gt 66 5 Residual FM 18 Install cables removed in steps 4 through 6 Hz peak to peak 11 6625 2866 14 amp Model 8444A Adjustments ADJUSTMENTS 5 11 First Converter Check and Adjustment REFERENCE Service Sheet 3 DESCRIPTION The 1 55 GHz oscillator cavity and the two 2 05 GHz IF bandpass cavities in the first converter are adjusted for maximum output signal level A 8555A Spectrum Analyzer System 8555A 8552 140 should be used duri
149. shipment with each instrument with a line connector plug to match the standard power cord for the country of destination on the purchase order A label indicating the power cable inside is affixed to the packing case indicates the connector plugs and the HP part numbers for the various available power cables and plugs 2 16 OPERATING ENVIRONMENT 2 17 The Tracking Generator does not require forced air cooling when operating at temperatures from 0 to 55 C 32 to 131 F When operating the instrument choose location which will provide at Model 8444A least three inches of clearance around the rear and both sides Normal air circulation will maintain a reasonable temperature within the instrument 2 18 INSTALLATION CONNECTIONS 2 19 rack mounting kit is supplied for rack installation Additionally joining bracket kit accessory can be provided to secure the Tracking Generator to the Spectrum Analyzer Installation instructions are supplied with both joining bracket and rack mounting kits 2 20 Electrical connections are provided by three coaxial cables and two line power cords Coaxial cables connect Spectrum Analyzer FIRST LO OUTPUT to Tracking Generator FIRST LO INPUT THIRD LO OUTPUT to THIRD LO INPUT and SCAN OUTPUT to SCAN IN OUT Double shielded coaxial cables are provided for connection between local oscillator input and output connectors Refer to Table 1 2 for description and HP part number of cables s
150. should be avoided as much as possible and when inevitable should be performed only by a skilled person who knows the hazard involved 1 13 Capacitors inside the instrument may still be charged even though the instrument has been disconnected from its source of supply 1 14 Make sure only fuses of the required current rating and type normal blow time delay etc are used for replacement Do not use repaired fuses or short circuit the fuse holders 1 15 Whenever it is likely that the protection has been impaired make the instrument inoperative and secure it against any unintended operation WARNING If this instrument is to be energized through an autotransformer for voltage reduction make sure the common terminal is connected to the earthed pole of the power source BEFORE SWITCHING ON THE INSTRUMENT the protective earth terminals of the instrument must be connected to the protective conductor of the mains power cord The mains plug shall only be inserted in a socket outlet provided with Model 8444A protective earth contact The protection must not be negated by using an extension cord power cable without a protective grounding conductor Interruption of the protective grounding conductor inside or outside the instrument or disconnection of the protective earth terminal is likely to make this instrument dangerous Intentional interruption of the earth ground is prohibited Servicing this instrument often req
151. specified parameters e Align To adjust specified variable elements of an item to bring about optimum or desired performance f Calibrate To determine and cause corrections to be made or to be adjusted on instruments or test measuring and diagnostic equipments used in precision measurement Consists of comparisons of two instruments one of which is a certified standard of known accuracy to detect and adjust any discrepancy in the accuracy of the instrument being compared g Install The act of emplacing seating or fixing into position an item part module component or assembly in a manner to allow the proper functioning of the equipment or system h Replace act of substituting a serviceable like type part subassembly or module component assembly for an unserviceable counterpart i Repair The application of maintenance services inspect test service adjust align calibrate replace or other maintenance actions welding grinding riveting straightening facing remaching or resurfacing to restore serviceability to an item by correcting specific damage fault malfunction or failure in a subassembly module component assembly end item or system j Overhaul That maintenance effort service action necessary to restore an item to a completely serviceable operations condition as prescribed by maintenance standards i e DMWR in appropriate technical publications Overhaul is
152. system the tracking generator provides a signal that tracks the frequency tuning of the spectrum analyzer The first and third local oscillators in the spectrum analyzer are applied to the tracking generator where they are combined with the output of a 1 55 GHz cavity oscillator The frequency of the cavity oscillator corresponds with the 1 5 GHz second local oscillator the 47 MHz fourth local oscillator and the 3 MHz IF signal to the detector in the spectrum analyzer The 1 55 GHz cavity oscillator is voltage tunable by the front panel TRACK ADJ control to compensate for minor frequency variations of the second and fourth local oscillators in the spectrum analyzer 2054168 150 5 Y1G TUNED CAVITY Mhz 47 OSCILLATOR OSCILLATOR vio Lo 0 5 1300 ANALYZER The power level of the tracking generator rf output is controlled by an ALC FIRST LO OUTPUT SCAN IN OUT 4 h pies HIRD TO OUTPUT scan SYSTEM _ circuit The ALC detector is part of a large scale integrated 1 61 circuit TEST T 7 BAMA package containing an attenuator low pass filter output amplifier and a dc rino io eur TRACKING blocking capacitor The detected signal is applied through a dc amplifier to PIN diode modulators in the third LO signal path to the tracking generator 05 1300 MHz 254 168 SONG etiim first converter The rf output level is adjustable over the 0 to 10 dBm range 8010 100
153. t within 0 5 dB of LOG REF level graticule line repeat Spectrum Analyzer calibration procedure m Reconnect Tracking Generator RF OUTPUT to Spectrum Analyzer INPUT and adjust TRACK ADJ for maximum signal amplitude n Rotate LEVEL control fully counterclockwise 10 dBm and note signal level on CRT display 10 to 12 dBm If the signal level is off more than 0 5 dB at the 0 dBm point or not within 10 to 12 dBm with the LEVEL control fully counterclockwise refer to paragraph Output Level Performance Check and 5 13 for LEVEL control calibration procedure 4 11 PERFORMANCE TESTS 4 12 The performance tests given in this section are suitable for incoming inspection troubleshooting and or preventive maintenance During any performance test all shields and connecting hardware must be in place The tests are designed to verify published specifications Perform the tests in the order given and record data on test card and or in the data spaces provided in each test 4 13 The tests are arranged in the following order Paragraph Test Description 4 16 Output Level and flatness 4 17 Frequency Stability 4 18 System Flatness 4 19 Frequency Accuracy 4 20 Distortion 4 14 Each test is arranged so that the specification is written as it appears in the Table of Specifications in Section 1 Next a description of the test and any special instructions or problem areas are included Each test that requires test equipme
154. tion LOG REF LEVEL Vernier 0 VIDEO FILTER OFF 2 Apply power to Tracking Generator and Spectrum INT Analyzer SCAN TRIGGER LINE or AUTO 3 Turn Spectrum Analyzer INTENSITY control fully CCW 4 Allow instruments to warm up for at least 30 minutes 5 Perform Spectrum Analyzer Operational Adjustments 80 MHz Calibration Refer to 8555A RF Section Operating and Service Manual 6 Set Spectrum Analyzer LOG LINEAR control to LOG LOG REF LEVEL to 0 dBm and BANDWIDTH to 300 kHz 7 Make the following interconnections between Tracking Generator and Spectrum Analyzer a FIRST LO INPUT to FIRST LO OUTPUT b THIRD LO INPUT to THIRD LO OUTPUT rear panel connections c RF OUTPUT to INPUT d SCAN OUTPUT to SCAN IN OUT 8 Check that the Spectrum Analyzer controls are set as follows INTENSITY cet ete 12 o clock BAND n l 2 05 GHz IF FREQUENCY 30 MHz BANDWIDTH 300 kHz SCAN WIDTH PER DIVISION 100 kHz INPUT ATTENUATION 020 0 20 dB TUNING STABILIZER ON SIGNAL IDENTIFIER _ OFF BASE LINE CLIPPER _ CCW SCAN TIME PER DIVISION 10 MILLISECONDS 9 Set Tracking
155. tionally a Model 8444A TM 11 6625 2866 14 amp P General Information Table 1 1 System Specifications These system specifications describe the performance available from the spectrum analyzer tracking generator system in various types of applications In all cases it is assumed that the spectrum analyzer is equipped with either an 8554B or 8555A Tuning Section 8552A or 8552B IF Section 140T or 141T Display Section SWEPT FREQUENCY RESPONSE MEASUREMENTS The tracking generator is used as a signal source to measure the frequency response of a device Dynamic Range gt 90 dB from spectrum analyzer 1 dB gain compression point to average noise level approximately 10 dBm to 100 dBm Spurious responses not displayed Gain Compression For 10 dBm signal level at the input mixer gain compression 1 dB Average Noise Level gt 102 dBm with 10 kHz IF bandwidth Absolute Amplitude Calibration Range Spectrum Analyzer Log From 122 dBm to 10 dBm 10 dB div on a 70 dB display or 2 dB div on 16 dB display 8552A has 10 dB div only Linear From 0 1 pV div to 100 mV div 8555A 20 mV div 85548 in a 1 2 sequence on an 8division display Tracking Generator Drive Level to Test Device 0 to 10 dBm continuously variable 0 dBm calibrated to 0 5 dB at 30 MHz Frequency Range 500 kHz to 1250 MHz with 8554B and 10 MHz to 1300 MHz with 8555A Scan Width Determined by Spectrum Analyzer Controls Per Division W
156. tor cavity and the 2 05 GHz first IP cavity Mixer bias is provided yy resistor ASATR1 Mixer conversion loss is approximately 4 dB 155 GHz OSCILLATOR A7 he 1 55 GHz oscillator is a single transistor oscillator whose frequency is letermined primarily by a radial cavity The oscillator frequency is tuned wound the center frequency established by the cavity by the positive voltage ipplied to the voltage vartable capacitor from the oscillator driver see lock 5 below Changes in the voltage level to this Varactor diode provide a requency tuning range of approximately 4 MHz refer to paragraph 5 9 for idjustment The oscillator driver is adjusted to provide an oscillator output of at least 7 dBm and a frequency tuning range of 4 MHz The ground etur lines for the power supply 20 and 10 sense lines are connected to chassis ground adjacent to the 1 55 GHz oscillator This provides a common eference point for the oscillator and sense grounds SERVICE SHEET 3 cont d 1 55 GHz OSCILLATOR DRIVER The oscillator driver consists of operational amplifier 201 transistor 208 and their associated components Together Ul and Q8 function as a non inverting operational amplifier Driver amplifier gain 1 A2R31 over AQR29 in parallel with A2R30 or approximately 2 4 The minimum output voltage is determined by A2R27 MIN TUNE while the maximum output is controlled by A2R26 MAX TUNE and the front panel TRACK ADJ
157. trument serial number prefix is not listed on the inside tile page of initial issue manual change sheets and manual up dating information is provided Later editions or revisions to the manual will contain the required change information in Section VII SERIAL NUMBER PREFIX 1339400285 SUFFIX Figure 1 2 Instrument ldentification 1 18 DESCRIPTION 1 19 The Model 8444A Tracking Generator is designed to complement both Model 8554B and Model 8555A Spectrum Analyzer RF Sections The Tracking Generator covers the frequency range of 500 kHz to 1250 MHz when used with the 8554B RF Section and from 10 MHz to 1 3 GHz when used with the 8555A RF Section The Tracking Generator Spectrum Analyzer functions as a system to perform frequency response measurements Additionally the system can be used as a signal generator or sweeper to supply a test signal to other devices An auxilliary output is provided for precision frequency measurements by an external frequency counter 1 20 The Tracking Generator converts the first and third local oscillator LO signals from the Spectrum Analyzer RF Section to a signal that tracks the frequency tuning of the RF Section With the Spectrum Analyzer operating in ZERO SCAN WIDTH the Tracking Generator is a CW signal generator tuned to the frequency of the analyzer In FULL or PER DIVISION SCAN WIDTH the Tracking Generator functions as a sweep oscillator which tracks the analyzer tuning Addi
158. uires that you work with the instrument s protective covers removed and with ac power connected Be very careful the energy at many points in the instrument may if contacted cause personal injury With the ac power cable connected the ac line voltage is present at the terminals of the power line module and at the LINE power switch Be very careful Bodily contact with this voltage can be fatal CAUTIONS BEFORE SWITCHING ON THIS INSTRUMENT make sure instrument s ac input is set to the voltage of the ac power source BEFORE SWITCHING ON THIS INSTRUMENT make sure that all devices connected to the instrument are connected to the protective earth ground BEFORE SWITCHING ON THIS INSTRUMENT make sure the line power mains plug is connected to a threeconductor line power outlet that has a protective earth ground Grounding one conductor of a two conductor outlet is not sufficient BEFORE SWITCHING ON THIS INSTRUMENT make sure the ac line fuse is of the required current rating and type normal blow time delay etc 1 16 INSTRUMENTS COVERED BY MANUAL 1 17 Hewlett Packard instruments carry a serial number sed Figure 1 2 on the back panel When 1 2 the serial number prefix on the instrument serial number plate of your instrument is the same as one of the prefix TM 11 6625 2866 14 amp P General Information numbers on the inside title page of this manual the manual applies directly to the instrument When the ins
159. um Aayar System 2 Connect test setup as shown in Figure 44 and set controls as follows Frequency Counter EEEE E ET 10 Hz 18 GHz RESOLUTION HZ 100 Tracking Generator ctt utut iot ete ene Fully Counterclockwise c DEEST 0 dBm 3 Set Spectrum Analyzer SCAN WIDTH to ZERO and adjust FREQUENCY for indication of 30 MHz 100 kHz frequency counter 4 Set Spectrum Analyzer LOG REF LEVEL to 10 dBm and LOG LINEAR to 2 dB LOG 5 Adjust Tracking Generator TRACK ADJ for maximum signal indication on CRT display 6 Adjust Spectrum Analyzer LOG REF LEVEL vernier control to position trace on 20 LOG REF graticule line 7 With Spectrum Analyzer FREQUENCY control slowly tune the Spectrum Analyzer and Tracking Generator between 10 MHz and 1 3 GHz if using 8555A RF Section or between 500 kHz and 1 25 GHz if using 8554B RF Section 8 Note and record the maximum overall power deviation one minor division on center vertical graticule line equals 0 4 dB MAX ACTUAL 3 dB 1 5 dB dB 4 10 TM 11 6625 2866 14 amp P Model 8444A Performance Tests PER FORMANCE TESTS 4 19 Frequency Accuracy SPECIFICATION Frequency Accuracy 15 MHz using Spectrum Analyzer slide rule dial Precision frequency measurements Frequency Accuracy 10 kHz for unknown s
160. um Analyzer System controls as follows Tracking Generator A 10 dBm CCW Spectrum Analyzer FREQUENCY eere sfr aa ae eed deus 250 MHz SCAN WIDTH PER 50 MHz SCAN TIME PER 1 SECOND 7 Replace the Test RF Section with either an 85548 or 8555A RF Section 4 14 11 6625 2866 14 amp Model 8444A Performance Tests PERFORMANCE TESTS 4 20 Harmonic Distortion cont d 8 Set Test Analyzer controls as follows FREQUENCY nA Ue RU IS 250 MHz bui tui tiit testes 300 kHz SCAN WIDTH PER DIVISION SCAN WIDTH PER 22 4440008 50 MHz INPUT ATTENUATION AA ee erc ete ea 20 dB BASE LNE CLIPPER ent 12 o clock VIDEO FILTER OFF SGAN TIME PER cette eter Dee eet eec er seit ed 10 MILLISECONDS icu 10 dB LOG EOGIBEFIBEVEL tiet tette 10 dBm LOG REPLEVEL ee eee ee cee 0 ater en Aenea a eee en A INT SCAN TRIGGER LINE 9 Observe the Test Analyzer display for harmonic and spurious signals 10 Figure 4 8 illustrates a typical display of the LO feedthru f
161. um Analyzer Vernier control or Tracking Generator LEVEL control to position signal on CRT LOG REF level graticule line System calibrated at 30 MHz with an amplitude accuracy of 0 5 dB Set Spectrum Analyzer to scan desired frequency range FREQUENCY control adjusted to center of frequency of interest SCAN WIDTH set for desired coverage Insert device to be tested between Tracking Generator RF OUTPUT and Spectrum Analyzer RF INPUT Rotate Tracking Generator MANUAL SCAN control fully counterclockwise Set Spectrum Analyzer SCAN MODE switch to EXT Rotate Tracking Generator MANUAL SCAN control clockwise to tune system through selected frequency range For automatic scanning set SCAN MODE switch to INT and SCAN TIME PER DIVISION to desired scan time Figure 3 3 Tracking Generator Operation with 8554B Spectrum Analyzer 2 of 2 Model 8444A TM 11 6625 2866 14 amp P Operation x 8444 THACKING GENERATOR 8 5500 wets 9 AN e LED t pi com ACCESSORY OUTLET Figure 3 4 Tracking Generator Operation with 8555A Spectrum Analyzer 1 of 2 3 6 Model 8444A TM 11 6625 2866 14 amp P Operation OPERATING PROCEDURE WITH AN 8555A 1 Checkthat the 115 230 switch is set to correspond EOG BINEAE LOG with the available line voltage Refer td Figure 3 2 LOG REF LEVEL O dBm steps 4 through 8 for switch and fuse informa
162. undamental and second harmonic signals 11 Repeat the above procedure at frequency of interest 12 Note and record maximum amplitude level of harmonic and spurious signals Harmonics x 25 dBm Spurious lt 40 dBm Figure 4 7 Typical Harmonic Distortion Figure 4 8 Typical Harmonic Distortion Display 0 to 1 00 MHz CRT Display 0 to 500 MHz 4 15 TM 11 6625 2866 14 amp P Model 8444A Performance Tests Table 4 1 Performance Test Record Hewlett Packard Tested by Model 8444A Tracking Generator Serial No Date Test Description Measurement Actual Unit Output Level Step 6 Step 7 Step 37 Residual FM peak to peak 8554B Stabiuzed 8555A Stabilized 8554B Unstabilized 8555A Unstabilized System Flatness 500 kHz to 1250 MHz 8554B 10 to 1300 MHz 8555A Harmonic Distortion Harmonic Signal Level Spurious Signal Level Frequency Accuracy Dial Accuracy Step 5 Frequency Accuracy Step 13 TM 11 6625 2866 14 amp P Model 8444A Adjustments SECTION V ADJUSTMENTS 5 1 INTRODUCTION IDENTIFIER control settings Otherwise the Spectrum Analyzer 5 2 This section describes adjustments required to control settings apply to either return the Tracking Generator to peak operating instrument condition after repairs are made Included in this section are test setups and check and adjustment 5 4 EQUIPMENT REQUIRED procedures A test card for recording data is included at the back of thi
163. upplied with the Tracking Generator 2 21 STORAGE AND SHIPMENT 2 22 Original Packaging 2 23 same containers and materials used factory packaging can be obtained through the Hewlett Packard Sales and Service offices listed at the rear of this manual 2 24 f the instrument is being returned to Hewlett Packard for servicing attach a tag indicating service 8120 1348 8120 1369 wer 7 TM 11 6625 2866 14 amp P Installation required return address instrument model number and full serial number Mark the container FRAGILE to assure careful handling 2 25 In any correspondence refer to the instrument by model number and full serial number 2 26 Other Packaging Materials 2 27 The following general instructions should be followed when repackaging with commercially available materials a Wrap the instrument in heavy paper or plastic If shipping to a Hewlett Packard Service office or center attach a tag indicating the type of service required return address model number and full serial number b Use a strong shipping container A double wall carton made of 350 pound test material is adequate c Use enough shock absorbing material three to four inch layer around all sides of the instrument to provide firm cushion and prevent movement inside the container Protect the control panel with cardboard d Seal the shipping container securely e Mark the shipping container FRAGILE to
164. verter output signal level 2 7 dBm 18 Install W9 cable between A5 J3 and A6 J2 Figure 5 6 First Converter Passband CH T Display 5 10 11 6625 2866 14 amp Model 8444A Adjustments ADJUSTMENTS 5 12 Automatic Level Control ALC Check and Adjustment REFERENCE Service Sheet 3 DESCRIPTION The modulator driver functions as an operational amplifier in the ALC loop A 10 kHz signal is applied to the operational amplifier and the loop gain is adjusted while maintaining 0 dB output level A limiter in the amplifier circuit is adjusted to prevent a large swing in the driver output when the analyzer sweeps through zero frequency Perform Level Control Calibration paragraph 513 after ALC loop adjustment AC VOLTMETER TEST OSCILLATOR POWER METER RF MILLI VOLTMETER CABLE ASSEMBLY THIRD 107 CABLE ASSEMBLY EQUIPMENT Spectrum Analyzer ccc ote a EE o te HP 8555A 8552 141T ot Dot Da Ot ot oua e ot od at ote HP 432A Termi COIN OUTIL coconut ae at att aan alias ortus tut itat atat Dot ott Dt HP 8478B eine HP 400E DC Voltmeter RF HP 412A Auer HP 652A Test Lead with alligator C able HP 10501 2 nine E 100K ohm 5 1 watt Terminat
165. w output level Page 4 13 4 20 Harmonic Distortion change SPECIFICATION to read Harmonic Distortion 25 dB below output level Nonharmonic spurious signals gt 40 dB below output level change to read 12 Note and record maximum amplitude level of harmonic and spurious signals Harmonics 25 dBm Spurious 40 dBm 7 1 11 6625 2866 14 amp Model 8444A Manual Changes CHANGE C throug 5 6 Paragraph 5 9 Figure 5 2 change to read as follows 5 9 1 55 GHz Oscillator Power Level Frequency Check and Adjustment REFERENCE Service Sheet 3 DESCRIPTION The 1 55 GHz local oscillator is checked for power output level and frequency tuning range Oscillator frequency is determined primarily by the LO cavity with tuning range and power output level determined by the drive voltage from the oscillator driver The oscillator is checked first for power level and then for frequency and tuning range After any adjustments are made the previous checks are repeated FREQUENCY COUNTER POWER METER T 357954527 tJ DIGITAL VOLTMETER DC POWER SUPPLY TEST LEADS THERMI STOR MOUNT Figure 7 1 1 55 GHz LO Power Level and Frequency Check and Adjustment Test Setup Manual Figure 5 2 EQUIPMENT Power Meter with HP 8478B Thermistor Mount HP 432A Frequency Counter with HP 5254C Plug in HP 5245L Digital Voltmeter with HP
166. wig 4 Figure 8 7 Tracking Generator Block diagram with Spectrum Analyzer Interconnections 8 11 TRACKING GENERATOR TROUBLESHOOTING TREE INTRODUCTION The troubleshooting tree is designed to isolate a malfunction to the com ponent assembly level During troubleshooting the ALC loop is disabled and adjusted to a power level equivalent to the normal loop level Prior to troubleshooting the Tracking Generator ensure that the Spectrum Analyzer is functioning properly and all interconnections are correct Block reference numbers in the troubleshooting tree correspond with block numbers on the block diagram and with the test points on the test point illustration Perform the procedure in the order given with the test equipment listed or with test equipment meeting the minimum specifications listed in Table 1 3 TEST EQUIPMENT Digital Voltmeter 2 HP 3440A 3443A Frequency Counter HP 5245152548 Power e ao A ATO ER a a e HP 4324 84788 Coaxial Attenuator 2 HP 8491A Option 10 Spectrum Analyzer System HP 8554B or 8555A 8552 140 series ye p e e eed owe HP 3604 puel m HP 10503A Adapter BNC Jack to BNC Jack 2 2 2 UG O14A U HP 1250 0080 Test lead with alligator clips 2 s common Wrench 5 16 open end 2 o 2 2 HP 8720 0030 Wrench 15 64inch openend 8710 0946 PROCEDURE It is assumed that the Trac
167. y 3 21 Amplifier Gain and Bandwidth Measurement 3 22 Figure 3 9 illustrates the CRT display for a 1 to 400 MHz amplifier with gain of approximately 19 dB A reference level is first established by connecting the Tracking Generator output to the Spectrum Analyzer through a 30 dB attenuator and scanning over the range of interest amplifier is then connected between the Tracking Generator and the Spectrum Analyzer and the same TM 11 6625 2866 14 amp P Operation frequency range scanned The Spectrum Analyzer 8554B set to full scan 0 1250 provides a CRT display indication as follows 3 dB bandwidth approximately 500 MHz level at 1 graticule line and zero gain point of approximately 1025 MHz a 30 dB Coaxial Attenuator installed at Tracking Generator RF OUTPUT b Spectrum Analyzer 8554B control settings BANDWIDTH eH 300 kHz SCAN WIDTH eem 0 1250 MHz INPUT ATTENUATION 2 2 10 dB SCAN TIME PER DIVISION 10 MILLISECONDS LOG LINEAR oet eoa tete stare LOG LOG REF LEVEL ende 10 dBm VIDEO FILTER OFF SCAN MODE INT SCAN TRIGGER eee AUTO c Tracking Generator control settings TRACK ADs Peak LEVEL Figure 3 9 Amplifier Gain and Bandwidth CRT Display 3 23 Precision Frequency Measurements 3 24 An external frequency counter may be used with the Tracking Generator Spectrum Analyzer System for freque
168. y controlled by FREQ SPAN DIV RESOLUTION BW and VIDEO FILTER settings PRECISION FREQUENCY MEASUREMENTS An external counter output is provided on the 8444 for precision frequency measurements The frequency of unknown signals as well as the frequency of any point on a frequency response curve can be measured The use of the 5300A 5303A Counter is suggested for frequency measurements to 500 MHz and the 5245L 5254C Counter for measurements to 1300 MHz Frequency Accuracy Tracking Generator Output For unknown signals typically less than 3 kHz frequency error after tracking adjustment with 10 kHz BW Tracking drift typically 10 kHz 10 min after 2 hour warmup For points on frequency response curve counter accuracy Residual FM 1 kHz peak to peak for time lt 0 1 sec Counter Mode of Operation Manual Scan Scan determined by front panel control of 8558B Scan Analyzer is fixed tuned receiver Counter reads center frequency to accuracy of tracking drift Counter Output Level Nominally 0 1 Vrms NOTE All above changes in specifications apply to use with an 8558B only Add the following 8444A Option 058 Tracking Generator Operation information when using the 8558B Spectrum 1 Check that the 115 230V switch is set to correspond with the available line voltage Refer td Figure 3 2 steps 4 through 8 for switch and fuse information Apply power to Tracking Generator and Spectrum Analyzer Turn Spectrum Analyzer IN
169. y is adjusted repeat steps 15 through 18 20 Disconnect Power Meter and connect W8 Cable to Isolator J2 21 Replace right side panel cover 11 6625 2866 14 amp Model 8444A Adjustments ADJUSTMENTS 5 10 1 55 GHz Oscillator Residual FM Check REFERENCE Service Sheet 3 DESCRIPTION The 1 55 GHz oscillator is checked for residual FM by mixing the oscillator output with a stable signal source and observing the resultant output on a calibrated spectrum analyzer display The second converter in Tracking Generator is used to mix the oscillator output with the 1500 MHz comb signal from a Frequency Comb Generator The mixer output is displayed using a HP 141T 8553B 8552B Spectrum Analyzer System which has less than 20 Hz peak to peak residual FM There are no adjustments for oscillator residual FM Perform power supply check for excessive ripple if residual FM is excessive CABLE ASSEMBLY FREQUENCY COMB GENERATOR UG 201A U SPECTRUM ANALYZER CABLE ASSEMBLY Figure 5 8 1 55 GHz LO Residual FM Check Test Setup EQUIPMENT Spectrum Analyzer System 0002 000011 HP 141T 8553B 8552B Frequency Comb Generator HP 8406A Cable Assy Selectro male to Selectro female HP 11592 60003 Cable Assy Selectro female to male 2 HP 11592 60001 Adapter BNC to

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