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HP 493A User's Manual

1. Section V Model 493A 495A Figure 5 2 TWT FILAMENT OPEN HEATER 3 SECTION I FILAMENT NO POWER ADJ R306 RESULTED COLLECTOR AMPLIFICATION 0301 303 FILAMENT POWER SUPPLY S CATHODE CATHODE i VERLOAD CURRENT _ _ CURRENT eap _ ADJ ADJ ol R53 R53 I PRIMARY _ POWER d 1 OVERLOAD vi RELAY ae i v2 V4 K3 FUSE Fl 90 SECOND El TIME DELAY L I HIGH VOLTAGE POWER SUPPLY TER I a 2 3 4 5 S EE I RELAY i K304 zd lt 4 SECTION 2 300 VOLT LOW POWER MODULATOR I MODULATOR AMPLIFICATION V403 0401 U m ADJUST Jada o E 1 REGULATOR lt 30db 1 i V6 V8 ADJUST ADJUST v6 v8 Ree EST i m _ SECTION 3 POOR FREQUENCY ADJUST MODULATOR ADJUST R405 V401 v302 POWER SUPPLY R411 C408 V403 V404 0401 RESPONSE OR BANDWIDTH 5 0 SECTION 4 NO MODULATI CRIOI CR404 v6 p LATION CRIO2 CR405 V401 V402 V4O3 404 NOTES umeme SECTION gt CIRCUIT BLOCK TO TROUBLE BLOCK CONNECTIONS CIRCUIT RELATIONSHIP AND ORDERED SEQUENCE FOR TROUBLE SHOOTING SIGNAL FLOW TROUBLE BLOCK 4934 61 CIRCUIT BLOCK Figure 5 2 Troubleshooting Chart 5 4 01280 3 Model 4934 495 5 21 TWT INSTALLATION a Replace mod
2. Figure 5 10 Filament Circuit Schematic Manual Changes Model 493A 495A Manual HP Part No 00493 90004 Page 6 CONDITIONS OF WARRANTY FOR BACKWARD WAVE OSCILLATOR TUBES AND TRAVELING WAVE TUBES Microwave BWO TWT tubes are warranted to be free from manufacturing defects The oper ating tube warranty will be 12 months unconditional from date of shipment from Hewlett Packard If a tube carrying this warranty fails and must be replaced oniy the applicable remaining war ranty of the first tube is transferred to the replacement tube or 90 days which ever is greater The Hewlett Packard Company will process warranty claims for customers on tubes which were supplied by Hewlett Packard for use in Hewlett Packard instruments The serial number of the tube failing and the serial number of the replacement tube must be noted on the warranty claim form In Warranty tubes purchased from Hewlett Packard must be returned immediately not to ex ceed 30 days from date of failure with a complete Warranty Claim Form to your local Hewlett Packard Sales and Service Office Addresses are listed in the instrument Manual Be sure to pack the tube in accordance with the Packing Instructions listed on the Warranty Claim Form warranty allowance cannot be made on tubes received broken due to improper packaging or showing evidence of tampering Instructions for filing a warranty claim are listed on the Microwave Tube W
3. AMPLIFIER OUPLE 208 Figure 3 3 RF Leveler Setup 01280 5 Model 4934 4954 Section IV Paragraphs 4 1 to 4 8 SECTION IV CIRCUIT DESCRIPTION 4 1 INTRODUCTION 4 2 The Models 493A and 495A circuitry is the same Only the traveling wave amplifier tube twt types are different However the basic traveling wave tube explanation given in this section applies for both the Models 493A and 495A twt types 4 3 OVERALL DESCRIPTION 4 4 A block diagram of the Model 493A is shown in figure 4 1 The purpose of the Model 493A Microwave Amplifier is to provide a means ofamplifyinga signal in the 4 0 to 8 0 gc range 7 0 to 12 4 gc range for the Model 495A to control the amount of amplification produced and to supply external modulation facilities for the amplified signal 4 5 The signal is applied to the microwaveamplifier input amplified and taken at the output of the travel ing wave amplifier tube twt All voltages required by the twt are supplied by the regulated high voltage power supply and the modulator The regulated high voltage power supply supplies collector helix and anode voltages to the twt The modulator supplies voltages to the grid of the twt Power gain of the twt is controlled by the modulator GAIN control Positive REGULATED voltage for the modulator is supplied through a 300 volt regulator circuit which maintains 300 at mod ulator negative voltage is supplied by the mo
4. ES TRANSFORMER we rns CONNECTIONS REFERENCE TUBE Ri9 25 1 L rok NOTES 1 CAPACITANCE PICOFARADS RESISTANCE OHMS UNLESS REFERENCE OTHERWISE INDICATED TUBE v4 2 PLUG IN 2 3 FACTORY SELECTED VALUE E TCHED CIRCUIT R37 5 P O PART OF 100 6 THIS CONNECTION USED FOR MEC TWT ONLY 300 VOLT 7 CONNECTION BETWEEN Ei C amp REGULATOR El E USED FOR SYLVANIA TWT ONLY RED 300 VOLTS REG TO BLK MODULATOR PLUG IN A400 PINS I2 AND i4 4 INSTRUMENT TWT ORANGE AND VOLTAGE LEAD TWT REQUIRE TO TO MANUFACTURER MENTS TI 495A 1800 2400 MICROWAVE ELEC 2400 2500 495A 1800 2000 SYLVANIA 2000 2300 495A 1800 2400 MICROWAVE ELEC 2400 2500 495A SYLVANIA 2500 2700 7 45 Y vio wir FROM 350V REG MODULATOR BOARD A400 493 495 5 350 Model 493A 495A Section VI Paragraphs 6 1 to 6 7 SECTION VI REPLACEABLE PARTS 6 1 INTRODUCTION 6 2 This section contains information for ordering replacement parts for instruments serial prefixed 350 For those with other prefixes see Appendix II Table 6 1 lists parts in alpha numerical order of their ref erence designators and indicates the description and 4 stock number of each part together with any appli cable notes Table 6 2 lists parts in numerical or
5. THRU XV400 NOT ASSIGNEO XV4OL 1200 0062 SOCKET TUBE 9 PIN XV402 1200 0055 SOCKET TUBE 7 PIN xV403 1200 0062 SOCKET TUBE 9 PIN XxV404 1200 0062 SOCKET TUBE 9 PIN L See introduction to this section y 6 6 01280 4 Model 493A 495A Table 6 1 Reference Designation Index Cont d Section VI Table 6 Circuit Reference Stock No Description Note 3150 0019 5060 0752 1401 0006 1251 0160 5000 0738 5000 0749 5000 0732 5060 0767 1400 0084 1200 0081 1200 0088 1200 0079 1200 0045 0370 0026 489A 12Q 1220 0008 489A 57A 5060 0222 1490 0030 5060 0740 1200 0080 MISCELLANEOUS AIR FILTER 3 5 8 X 7 11 16 X 1 2 BOTTOM COVER ASSEMBLY 16L FM CLIP TUBE CONNECTOR P C 15 CONTACTS FOR Al amp A101 COVER IDE COVER SIDE FRAME FOOT ASSEMBLY FM FUSEHOLDER EXTRACTOR POST TYPE INSULATOR BUSHING NYLON Q301 MTG INSULATOR DIODE SMALL WASHER FOR CR302 CR303 AND Q302 Q303 MTG INSULATOR TRANS ISTOR 4 HOLE Q303 MTG INSULATOR TRANSISTOR 9501 KNOB GAIN ADJUST RETAINER AIR FILTER SHIELD TUBE FOR K3 SHOULDER SCREW AIR FILTER RETAINER SIDE HANDLE ASSEMBLY STAND TILT TOP COVER ASSEMBLY 16L FM WASHER INSULATOR CR302 CR303 MTG 01280 4 See introduction to this section 6 7 Section VI Model 493 495 Table 6 2 Table 6 2 Replaceable Parts d Stock No Description M r Mi
6. Figure 3 2 Amplitude Modulation Section HI Paragraphs 3 17 to 3 18 gain of the amplifier to hold the output level constant In practice output levels can be held within 1 db during input signal variations as great as 20 db Note The limitations to the degree of leveling ob tainable is determined by errors introduced by crystal detector and directional coupler 3 17 BUFFER OR ISOLATION The 4 Model 493A Microwave Amplifier can also be used as a buffer be tween a microwave signal source andan external load As a buffer it isolates load reflections from the signal Source and eliminates the problems whichoccur when the source is modulated directly 3 18 AMPLITUDE MODULATION The Model 493A is particularly suitable for use in power amplifier Systems This feature opens new fields of application Since it is not possibleto amplitude modulate a reflex klystron directly Furthermore the traveling wave amplifier tube s use as a power amplifier means that rfoutputfrom a microwave oscillator canbe sine wave 3 4 Model 493A 495 pulse or pulse train modulated without starting delays and jitter generally present when the oscillator itself is modulated Thus in addition to amplification the traveling wave amplifier tube provides a simple sys tem of amplitude modulation SIGNAL GENERATOR SOURCE 4712 4 gc MODULATION QUTPUT SNPUT INPUTO OUTPUT OUTPUT 493A 495A MICROWAVE
7. CATHODE CURRENT 52 FILAMENT ADJUST SWITCH ADJUST R53 CHA B 115 230 R306 350V ADJUST HIGH VOLTAGE 84905 LEVEL ADJUST R57 LOW FREQUENCY ADJUST GAIN LIMIT ADJUST HIGH VOLTAGE BOARD R418 Al TWT v7 MODULATOR BOARD E BOARD 52790 COLLECTOR EIH HELIX EIG ANODE EIF CATHODE EIE GRID EID HTR CATH EIC CR 02 HEATER EIB GND EIA CR303 TI 5 T2 C30lA B MP S 1303 CIO2 A B METER SENSITIVITY R205 CONNECT DC CLIP ON MILLIAMMETER PROBE LEAD HERE TO MEASURE HELIX CURRENT Figure 5 3 P Model 493A Top View 5 6 01280 2 Model 493A 495A 01280 2 FILAMENT ADJUST FILAMENT CIRCUIT R306 BOARD Section V Figure 5 4 MP S 1304 SCREWS HOLDING HIGH VOLTAGE TWT IN PLACE RECTIFIER BOARD Figure 5 4 Model 493A Bottom View SCREWS HOLDING TWT IN PLACE 5 7 Section V Model 493A 49 Paragraphs 5 28 to 5 30 odel 495 hp 428A DC CLIP ON MILLIAMMETER SIGNAL GENERATOR hp 626A li 12 4gc hp 6188 Ap 620A CONNECT TO 4 7 000 Ap 493A 495A ORN LEAD ON BOARD LOCATED BEHIND METER 201 SEE 16 5 3 Ap 434A POWER METER MICROWAVE AMPLIFIER 9 RF OUTPUT p 11500A CABLE p 11500A CABLE LD M 428BC Figure 5 5 Power Amplification Setup b With the 350 volt adj R405 figure 5 3 set 350 volt regulated power supply to 350 volts c Vary line vol
8. Model 493 495 HELIX BARREL CERAMIC SUPPORT ROD CERAMIC SPACERS DRIFT TUBE Electron beam directed through center ofhelix The arrows show direction and magnitude of force exerted on the electron beam by the rf signal Electron bunching caused by the electric field of Amplification of signal of helix begins as the field formed by the electron bunches interacts with the electric field of the rf signal The newly formed electron bunch adds a small amount of voltage to the rf signal on the helix The slightly amplified rf signal then produces a denser electron bunch which in turn adds a still greater voltage to the rf signal and so Amplification increases as the greater velocity of the electron beam pulls the electron bunches more nearly in phase with the electric field of The additive effect of the two fields exactly in phase produces a greatest re Attenuators placed near the center of the helix reduce all the waves traveling along the helix to nearly zero This prevents undesired waves 10 1 12 CATHODE ASSEMBLY EVACUATION TIP 0FF GRID ELECTRONS BUNCH HERE DIRECTION AND MAGNITUDE OF THE FORCE EXERTED ON THE ELECTRON BEAM BY THE ELECTRIC FIELD OF THE CW WAVE 0 565 such as waves reflected from mismatched loads from returning to the tube input and causing oscillation Electron bunches travel throug
9. OPERATING AND SERVICE MANUAL MODEL 493A 495A MICROWAVE AMPLIFIER SERIALS PREFIXED 350 330 304 229 151 142 COPYRIGHT HEWLETT PACKARD COMPANY 1963 1501 PAGE MILL ROAD PALO ALTO CALIFORNIA U S A 01280 5 Printed AUG 1966 Aodel 493A 495A Table of Contents Lists of Hlustrations and Tables TABLE OF CONTENTS Section Page Section Title Page I GENERAL INFORMATION 1 1 MAINTENANCE 5 1 1 1 On a ee 1 1 5 1 Air Filter Maintenance 5 1 1 3 Description eee l l 5 6 Panel Removal sea 5 1 1 11 Instrument Option e so 1 1 5 8 and Bottom Panels Sel 1 13 Instrument Identification 1 1 5 9 Side Panels 5 1 1 15 Cooling System 1 1 5 10 Test Equipment Required 5 3 1 17 Three Conductor Power Cable 1 1 5 12 Troubleshooting Procedure 5 3 1 20 Increasing Tube Life 1 1 5 14 Repair lt 5 3 1 22 Traveling Wave Amplifier Tube 1 1 5 20 Removal a 5 3 5 21 TWT Installation e 5 5 TI INSTALLATION raid 5 22 TWT Voltage Adjustments P 3 S25 2 1 a RSE 5 24 Filament Adjustment 5 5 2 3 Mechanical Inspection vos usos 42941 5 25 Collector Helix Adjustments 5 5 2 5 Installation 2 1 5 26 Anode Adjus tment oe 5 5 2 7 Conversion to Rack Mount pal 5 27 350 Volt Adjustment 5 5 2 9 Power Requirements 2 2 5 28 Grid Voltage 8 2 11 R
10. 1 2W R61 0727 0246 R FXD DEPC 600K OHM 1 1 2W R62 0727 0246 R FXD DEPC 600K OHM 1 1 2W R63 0727 0246 R FXD DEPC 600K OHM 1 1 2W R64 0727 0246 R FXD DEPC 600K OHM 1 1 2W R65 0727 0222 R FXD DEPG 214K OHM 1 1 2W R66 0690 2241 R FXD COMP 220K OHM 10 1W FACTORY SELECTED COMP TYPICAL VALUE GIVEN R67 0727 0276 R FXD DEPC 1MEGOHM 1 1 2W R 8 0727 0245 R FXD DEPC 500K OHM 1 1 2W R69 THRU R100 NOT ASSIGNED 0690 4701 R FXD COMP 47 OHM 10 1W See introduction to this section 01280 4 Model 493A 495A Section VI Table 6 1 Table 6 1 Reference Designation Index Cont d Circuit Stock No Description Note Reference R102 0690 1041 R FXD COMP 100K OHM 10 1W R103 0690 1041 R FXD COMP 100K OHM 10 1W R104 THRU R119 NOT ASSIGNED R120 2100 0045 R VAR COMP 500K OHM 10 LIN 2W R121 THRU R200 NOT ASSIGNED R201 0727 0045 R FXD DEPC 100 OHM 1 1 2W R202 0727 0100 R FXD DEPC 1000 OHM 1 1 2W R203 0727 0100 R FXO DEPC 1000 OHM 1 1 24 R204 0727 0045 R FXD DEPC 100 OHM 1 1 2W R205 2100 0335 R VAR WW 10 OHM 20 2W R206 THRU R300 NOT ASSIGNED R301 0687 5601 R FXD COMP 56 OHM 10 1 2W R302 0687 6801 COMP 68 OHM 10 1 2W R303 0687 3911 R FXO COMP 390 OHM 10 1 2W R304 0812 0019 R EXD WW 0 33 OHM 5 2W R305 0812 0019 R FXD WW 0 33 OHM 5 3w R306 2100 0308 R VAR WW 2 OHM 10 LIN 5W R307 0816 0015 R FXD WW 50 OHM 10 10W R308 THRU R400 NOT ASSIGNED R401 0687 4741 R FXD COMP 470K OHM 10 1 2W R402 0687 1041 R FXD CO
11. 1 5 Megohm 1 1 2W HP Part No 0757 0156 Change R422 and R424 to R FXD MET FILM 1 Megohm 1 1 2W HP Part No 0757 0059 Change R423 to R FXD MET FILM 500K ohm 1 1 2W HP Part No 0757 0052 Change R430 to R FXD MET FILM 200K ohm 1 1 2W HP Part No 0757 0128 Page 5 17 Figure 5 14 and Page 6 6 Table 6 1 Change R431 to R FXD MET FILM 365K ohm 1 1 2W HP Part No 0757 0865 CHANGE 8 Page 5 13 Figure 5 10 Replace existing Figure 5 10 with the attached copy Page 6 3 Table 6 1 ChangeFl 115V to 4 amp HP Part No 2110 0055 Change F1 230V to 2 amp HP Part No 2110 0002 Change J3 to HP Part No 1251 2357 Add K5 Relay 3PDT HP Part No 0490 0124 Page 6 6 Table 6 1 Change S2 to HP Part No 3101 1272 Change W1 to HP Part No 8120 1348 CHANGE 9 Page 6 3 Table 6 1 Change DS1 DS2 from HP Part No 1450 0048 to HP Part No 1450 0419 This changes the front panel lamps from red to white to conform to IEC recommendations CHANGE 10 Page 3 2 Table 3 1 Step 1 Change all time delay references from 90 seconds to 120 seconds three places Page 4 5 Change all time delay references from 90 seconds to 120 seconds four places Page 5 13 Figure 5 10 Change K1 to 120 SECOND TIME DELAY Page 6 3 Parts List Change KI to HP Part No 0490 0933 RELAY TIME DELAY 120 second HP Part No 0490 0933 is the recommended replacement for HP Part 0490 0135 in all models 493 4
12. Delete HP Part No 3150 0019 Air Filter 495A only 300 VOLTS REG TO MODULATOR ona PLUG IN A400 PINS 12 amp 14 Ka TO TI PINS 1 amp 3 NOTE RELAY SHOWN DE ENERGIZED STRAIGHT FOR TWT 7 30 ANGLE FOR HUGGINS TWT INSERT FLAP Figure 1 Model 495A Air Duct Assy 00495 6001 CHANGE 4 Page 6 2 Table 6 1 Change A200 Assembly to HP Part 489A 65E Page 6 5 Table 6 1 Change R205 to HP Part 2100 1767 CHANGE 5 Page 6 3 Table 6 1 Change K2 to HP Part No 0490 0746 Under K2 listing add Relay Socket HP Part No 6490 0751 Relay Retainer HP Part 0490 0750 CHANGE 6 Page 5 6 Figure 5 3 Replace existing Figure 5 3 with attached copy Page 5 15 Figure 5 12 Add chassis part K4 300 VOLT REGULATOR v6 C14 Manual Changes Model 493A 495A Manual HP Part No 00493 90004 Page 3 Connect as shown in partial schematic below Page 6 3 Table 6 1 Add K4 HP Part No 0490 0026 Page 5 17 Figure 5 14 and Page 6 3 Table 6 1 Add chassis part CR103 Diode Silicon HP Part No 1901 0033 On schematic connect CR103 anode to A400 pin 8 and cathode to ground Page 5 17 Figure 5 14 and Page 6 5 Table 6 1 Change R414 to 33 2K ohm HP Part 0757 0044 Change R421 to 2 87 Megohm HP Part No 0727 0286 CHANGE 7 Page 5 15 Figure 5 12 and Page 6 4 Table 6 1 Change R38 to R FXD MET FILM 988K ohm 1 1 2W HP Part 0698 354
13. Mode 493 495 Section 1 Paragraphs 1 1 to 1 23 SECTION 1 GENERAL INFORMATION 1 1 INTRODUCTION 1 2 This manual provides instructions for installa tion operation circuit description and maintenance of the 49 Models 493A and 495A Microwave Amplifiers The manual applies directly to instruments which carry the serial number prefix indicated on the title page The Model 495A Microwave Amplifier is shown in figure 1 1 Specifications for both instruments are given in table 1 1 1 3 DESCRIPTION 1 4 The Models 493A and 495A are broadband linear amplifiers that provide signal amplification to at least 30 db The Model 493A covers the 4 0 to 8 0 gc range the Model 495A coversthe 7 0 to 12 4 gc range Both instruments produce atleast watt at the output with the application of 1 milliwattorless at the input 1 5 The Models 493A and 4954 output can be ampli tude modulated Externally supplied modulation sig nals are applied to the MOD INPUT Since the modu lation circuit is dc coupled an externalleveler circuit can be connected at the MOD INPUT to obtain rela tively flat power output across the band 1 6 The Models 493A and 495A require no tuning and are particularly useful for signal amplification over a broad band of frequencies The GAIN control is the only variable front panel control It controls rf signal amplification and average rf power output 1 7 The Models 493A and 495A traveling wave ampli fie
14. N J Times Telephoto Equipment New York N Y Electronic Industries Association Any brand Tube meeting Standards Washington DC Unimax Switch Div Maxon Electronics Corp Wallinglord Conn United Transformer Corp New York N Y Oxford Electric Corp Chicago 111 Bouins Inc Riverside Calif Acto Div of Robertshaw Controls Co Columbus Ohio All Star Products Inc Defiance Ohio Avery Adhesive Label Corp Monrovia Calit Hammarlund Co inc New York N Y Stevens Arnold Co Inc International instruments Inc Grayhitl Co LaGrange HI Transformer Corp Venice Calif Winchester Elec Div Litton iad Inc Oakville Conn Boston Mass Orange Conn Military Specification International Rectifier Corp El Segundo Calit Aupax Electronics inc Cambridge Mass Batty Controls Div Barry Wright Corp Waterlown Mass Cartes Precision Etectric Co Skokie Sperti Faraday Inc Copper Hewitt Etectric Div Hoboken N J Jelfers Etectronics Division of Speer Carbon Co Du Bois Pa Fairchild Camera amp Inst Corp Defease Prod Division Clifton N J Maguire industries inc Sylvania Electtic Prod Inc Greenwich Coan Etectionic Tube Division Emporium Pa Astron Corp East Newark Harrison N J Switcheraft tnc Chicago Metals amp Controls inc Spence Products Attleboro Mass Phillips Advance Control Co Joliet Research Products Corp Madison Wis Rotron Mf
15. amp Betts Co Elizabeth N J 60741 Triplett Electrical inst Co Biuffton Ohio 61775 62113 63743 64959 65092 58295 58346 70276 70318 70485 20563 70303 70998 71002 71041 71218 21286 71313 71400 71436 71447 71450 11468 Tn 71482 71590 T1616 71200 71707 71744 71753 Union Switch Signat Div of Westinghouse Air Brake Co Universal Electric Co Watd Leonard Electric Co Pittsburgh Owosso Mich Mi Vernon N Y Westem Electric Co Inc New York N Y Weston inst Inc Weston Newark Newark N J Witlek Mfg Co Chicago 11 Revere Wollansak Div Minn Mining amp Mfg Co St Paul Minn Allen Mig Hartford Conn Alimetal Screw Product Co Inc Garden City NY Atlantic india Rubber Works Inc Chicago HE Amperite Co Inc Union City N J Belden Mig Co Chicago H Bird Electronic Cotp Cleveland Ohio Bitnbach Radio Co New York N Y Boston Gear Works Div of Murray Co ef Texas Quincy Mass Bud Radio Inc Willoughby Ohio Camloc Fastener Corp Paramus Cardwell Condenser Corp Lindenhurst L L N Y Bussmann Mig Div of McGraw Edison Co St Louis Mo Chicago HI Pico Riveta Calif Chicago Condenser Corp Calif Spting Co Inc CTS Corp Elkhart Ind ITT Cannon Electric inc Los Angeles Calif Cinema Plant Hi Q Div Aerovox Corp Burbank Calit C P Clare amp Co Chicago Hi Centra ab Div of Globe Union Inc Mil
16. 0048 Socket tube 9 pin minat XV104 1200 0047 Socket tube 7 pin minat w ears for pc Table 6 2 Delete 0140 0149 0727 0237 0765 0008 0727 0282 0140 0208 1902 0026 0727 0283 0727 0286 0130 0016 0687 1041 0727 0165 0690 2231 0140 0203 0727 0252 0727 0230 0767 0010 0150 0011 0690 8231 0721 0235 0693 5631 0140 0194 0690 4731 2100 0096 0727 0332 0727 0221 0687 3331 Increase TQ to 2 0727 0276 Decrease TQ to 1 0773 0010 Increase TQ to 2 1901 0030 Increase TQ to 20 0150 0012 Increase TQ to 3 0130 0013 Decrease TQ to 1 0727 0246 Increase TQ to 7 2100 0094 Decrease TQ to 1 0687 4731 Increase TQ to 2 Add 0130 0017 var cer 8 50 500 12982 557 019 U2PO 34R 1 1 0140 0146 fxd mica 82 pf 5 300 72136 DMI15F820J 1d 0140 0216 fxd mica 120 pf 2 300 72136 DMISF121G 300V 11 0140 0225 fxd mica 300 pf 1 300 72136 DMI5F301F 300V 11 0150 0015 fxd TiO 2 2 pf 10 500 vdew 82142 Type JM 11 0686 6845 R fxd comp 680K ohms 59 1 2W 01121 EB6854 T 0687 1231 R fxd comp 12K ohms 410 1 2W 01121 EB1231 11 0687 1421 R fxd comp 1 5K ohms 41095 1 2W 01121 EB1521 11 0693 1531 R fxd comp 15K ohms 41075 2W 01121 HB1531 3 1 0693 2731 fxd comp 27K ohms 10 2W 01121 HB2731 2 1 0693 4741 R fxd comp 470K ohms 10 2W 01121 HB4741 11 0693 6831 fxd comp 68K ohms 10 2W 01121 HB6831 11 0693 8231 R fxd comp 82K ohms 10 2W 01121 HB8231 1
17. 493A ONLY 08040 M2407 DB 1952 0017 ELECTRON TUBE TWT 4 8GC 493A ONLY 04651 SYT 4298 ird 1 1952 0019 ELECTRON TUBE TWT 7 12 4GC 495A ONLY 04651 SYT 82750 x i 2100 0045 R VAR COMP SOOK OHM 10 LIN 2W 28480 2100 0043 ia 2100 0094 R VAR COMP 50K OHM 30 LIN 1 5W 28480 2100 0094 reu 2100 0096 R VAR COMP 1 30 LIN 1 5W 28480 2100 0096 11 2100 0100 R NAR COMP 3 5 MEGOHM 30 LIN 1 4W 28480 2100 0100 E d 2100 0508 R VAR WW 2 OHM 10 LIN SW 28480 2100 0308 11 i 2100 0335 R VAR WW 10 OHM 20 2W 28480 2100 0555 1 2110 0005 FUSE CARTRIDGE 3A 75915 512005 ij 2110 0045 FUSE CARTRIDGE 1 5A 250V 75915 51201 5 1l 3101 0034 SWITCH SLIDE 4PDT 2190 6655 1 i 5101 0041 SWITCH TOGGLE DPDT 3 POSITION 8140 8906K270 2 3150 0019 AIR FILTER 3 5 8 X 7 11 16 X 1 2 2866 10337 1 5160 0026 FAN MUFF IN 8480 3160 0026 1 5000 0752 FRAME 28480 5000 0732 2 5000 0758 COVER SIDE 8480 5000 0758 il 5000 0759 COVER 510 8480 000 0939 1 5060 0740 COVER ASSY i6L FM 8480 5060 0740 11 5060 0752 BOTTOM COVER ASSY 16L FM 8480 5060 0752 1 5060 0222 SIDE HANDLE ASSY 28480 5060 0222 2 5060 0767 FOOT ASSY FM 28480 5060 0767 1 8120 0078 POWER CABLE 28480 8120 0078 i 9100 0152 TRANSFORMER POWER 28480 9100 0152 1 9100 0155 TRANSFORMER POWER 28480 9100 0155 1 See introduction to this section 6 10 01280 4 Models 493A 495A Code No 00000 00136 00213 00287 0
18. 495A Manual HP Part No 00493 90004 Page 2 1952 0022 Electron Tube TWT 4 8 GHz 493A only 96341 MA 2344 1952 0023 Electron Tube TWT 7 12 4 GHz 495A only 96341 MA 2345G CHANGE 3 igure 5 3 and Parts List Model 495A only An Air Duct Assembly HP Part No 00495 6001 is mounted between the fan housing above FILA ENT adjust R306 and the TWT V7 This air duct assembly is shown in Figure 1 Note the duct is straight for the MEC TWT and bent to an angle with the flap inserted for the MA TWT In each case the air flow is forced directly onto the lWT collector Included in the 00495 6001 as sembly is a finger guard which is to be used in place of the air filter and should be mounted onto the fan behind the rear panel This finger guard is available separately as HP Part No 3160 0099 Page 5 12 paragraph 5 44 both Models 493A and 495A Add introductory paragraphs to read To change a Model 493A 4 8GHz to the 7 12 4 GHz frequency range the 00495 6001 Air Duct Assembly must be installed and is included as part of the Replacement Kit TWT HP Part No 495A 95A To change a Model 495A 7 12 4 GHz to the 4 8 GHz frequency range the following two parts must be ordered Bracket Fan Mounting HP Part No 489A 85B includes 493A type air duct The 00495 6001 Air Duct Assembly included in the 495A is not used with the 4 8 GHz frequency range TWT Page 6 7 Table 6 1 Parts List under MISCEL LANEOUS R
19. Also if the filament voltage is not correct the fail safe relay K304 willener gize removing high voltage and filament voltage from the circuit In such cases the primary power switch must be switched off then on again If condition persists re move the power from the instrument and troubleshoot 3 Connect Model 493A 495A OUTPUT to the in strument into which the amplified signal is to be applied 4 Apply rf power to the Model 493A 495A INPUT The maximum allowable power than can be ap plied to the Model 493A 495A INPUT is 100 mw Figure 3 1 Turn On Procedure 01280 3 Model 493A 495A Section LINE OFF STANDBY 952 ES RF POWER INPUT ourpur Figure 3 2 4 f 1 STANDBY CATHODE CURRENT o lt 493A MICROWAVE AMPLIFIER pom reo powh sl l a HEWLETT PACKARD Rotate the GAIN control full clockwise Ube Apply a negative going signal tothe MOD INPUT Specifications bandpass for small signalinputs dc to 500 kc bandpass for large signal inputs dc to 100 kc Small signal inputs are from 0 to 10volts large signal inputs 10 to 20 volts Bandwidths are measured at the grid of thetwt Note Peak cathode current must not be allowed to exceed RATED POWER level If the MOD INPUT voltage is positive during any part of the modulation cycle GAIN must be reduced accordingly 01280 5
20. CONNECTION FOR BANDWIDTH ADJUSTMENT CONNECT TO EID OF El BOARD hp 493A 495A MICROWAVE AMPLIFIER WIDE RANGE OSCILLATOR hp 200CD cooo 15 CABLE CRYSTAL DETECTOR hp 10503A hp 423A CABLE CABLE USE THIS CONNECTION FOR PERFORMANCE CHECK FREQUENCY RESPONSE CHECK LO M 43080 Figure 5 7 Bandwidth Setup SIGNAL GENERATOR hp 6188 hp 620A hp 626A 4 7gc 7 Igc H 12 4 gc 000 O POWER METER hp 434A hp 493A 495A MICROWAVE AMPLIFIER POWER i Fact hp 11500A CABLE i hp 11500A CABLE 2 11001A CABLE LD M 4328 Figure 5 8 Modulator On Off Ratio 5 10 01230 2 Medel 493 495 SIGNAL GENERATOR hp 620A 7T igc hp 6188 4 79 0930 SQUARE WAVE GENERATOR O hp 211A O RE OUTPUT EXT GJ AC 16Q CABLE OUTPUT AC 16B CABLE hp 626A 1 12 44 Section V Paragraphs 5 38 to 5 40 AC VTVM hp 400D hp 493A 495A MICROWAVE AMPLIFIER INPUT Re OUTPUT O Q 10db PAD CRYSTAL DETECTOR AC 168 4208 CABLE 0 45 Figure 5 9 Residual Check 5 38 MODULATOR ON OFF RATIO a Connect the Model 493A as shown in figure 5 8 with the signal generator and the power meter at the same setting as those in paragraph 5 36 steps c and d b Rotate the Model 493A GAIN control full clock wise
21. CONNECTOR BNC 91727 UG 1094 U 2 i 1251 0148 CONNECTOR POWER MALE 3 PIN 60427 H 1060 16 2L ii 1251 0160 CONNECTOR PC 15 CONTACTS 07233 250 15 50 210 5 1400 0084 FUSEHOLDER EXTRACTOR POST 75915 342014 1 1401 0006 CLIP sTUBE PLATE CONNECTOR V1 V2 V6 91418 SPP 3 1 1450 0048 LAMP PILOT NE2H 08717 858R 2 1490 0050 STAND TILT 28480 1490 0030 1 1850 0021 TRANSISTOR GERMANIUM PNP 2N 44l 16758 2 441 2 1850 0038 TRANSISTOR GERMANIUM PNP 86684 34879 1 1854 0005 TRANSISTOR SILICON NPN 28480 1854 0005 1 1901 0025 SEMICON DEVICE DIODE JUNCTION 28480 1901 0025 6 1901 0029 SEMICON DEVICE DIODE SILICON 28480 1901 0029 5 1901 0050 SEMICON DEVICE DIODE JUNCTION 28480 1901 0030 17 1901 0032 DEVICE DIODE JUNCTION 1N2209 04715 1N3209 2 1902 0025 DEVICE DIODE SILICON 28480 1902 0025 1902 0056 SEMICON DEVICE DIODE SILICON 28480 1902 0056 11 1902 0215 SEMICON DEVICE DIODE SILICON BREAKDOWN 28480 1902 0215 il 1902 0218 ICON DEVICE DIODE SILICON BREAKDOWN 28480 1902 0218 2 1925 0045 ELECTRON TUBE PENTODE GEWG 33173 6EWG 1925 0048 ELECTRON TUBE PENTODE 8068 33173 8068 3 1955 0004 ELECTRON TUBE PENTODE 608 33173 GUB 51 1935 0007 ELECTRON TUBE PENTODE GAUB 33173 6AUB 11 1940 0001 ELECTRON TUBE 5651 86684 5651 ji 1940 0004 ELECTRON TUSE 0A2 VOLTAGE REGULATOR 86584 OAD 2 1952 0010 ELECTRON TUBE TWT 7 12 4GC 495A ONLY 108040 M2403 L8 ij i 1952 0016 ELECTRON TUBE TWT 4 8GC
22. Incoming air is filtered through a specially treated filter at the rear of the instrument The air filter should be checked periodically and if dirty cleaned A dirty air filter will affect instrument performance as well as component life Refer to para graph 5 1 for air filter maintenance 1 17 THREE CONDUCTOR POWER CABLE 1 18 To protect operating personnel the National Electrical Manufacturers Association NEMA recom mends that the instrument panel and cabinet be grounded All Hewlett Packard instruments are equipped with a three conductor power cable which when plugged into an appropriate receptacle grounds the instrument The offset pin on the power cable s three prong connector is the green grounding wire 1 19 To preserve the protection feature when opera ting the instrument from a two contact outlet use a three prong to two prong adapter and connect the green pigtail on the adapter to ground 1 20 INCREASING TUBE LIFE 1 21 The cathode of the traveling wave amplifier tube has a shorter cathode life than those used in conventional types of tubes In addition the traveling wave amplifier tube is expensive TURN THE INSTRU MENT OFF WHEN NOT IN USE 1 22 TRAVELING WAVE AMPLIFIER TUBE TWT 1 23 The twt supplied with the microwave amplifier and replacement twt s purchased from Hewlett Packard Company are guaranteed against electrical failure for a specified period either period of time from date of purc
23. M Motor Company Westchester lil Twentieth Century Plastics Inc Los Angeles Calif Westinghouse Electric Corp Semi Conductor Dept Youngwood Pa Vltronix Inc San Mateo Calif tliumitronic Engineering Co Sunnyvate Calif Cosmo Plastic Electrical Spec Co Cleveland Ohio Barber Colman Co Rockford Tiffen Optical Co Roslyn Heights Long Island N Y 42 Revised July 1966 01280 5 Code No 05729 05783 05820 06004 06080 06175 06492 06540 06555 06666 06751 06812 06980 07088 97126 97137 97138 07149 07233 07261 97263 97322 07387 97700 07910 07933 07966 97980 08145 08289 08358 08664 08717 08718 08792 08984 09026 09134 09145 09250 09569 10214 10411 10646 11236 11237 11242 11312 11534 11711 11717 11870 12136 12697 12859 Manufacturer Address Metra Tel Corp Stewart Engineering Wakefieid Engineering Inc Bassick Co The Raychem Corp Westbury N Y Santa Cruz Calif Wakefield Mass Bridgeport Conn Redwood City Calif Bausch and Lomb Optical Co Rochester N Y E T A Products of America Chicago IH Amatom Electronic Hardware Co Inc New Rochelle N Y Beede Electrical Instrument Co Inc Penacook N H Indianapolis Ind Phoenix Atiz General Devices Co Inc Semcor Div Components inc Torrington Mfg Co West Div Van Nuys Calif San Carlos Calif Van Nuys Calif Pasadena Cali
24. Monte Catif Technology Instrument Corp of Calif Newbury Park Calif THE FOLLOWING HP VENDORS HAVE NO NUMBER ASSIGNED iN THE LATEST SUPPLEMENT TO THE FEDERAL SUPPLY CODE FOR MANUFACTURERS HANDBOOK 00006 Malco Toot and Die Los Angeles Calif 0000M Western Coil Div of Automatic ind Inc Redwood City Calif 00002 Willow Leather Products Corp Newark N J 000AA British Radio Electronics Ltd Washington D C 00048 ETA England 00088 Precision Instrument Components Co Van Nuys Calif 000MM Rubber Eng amp Development Hayward Calif GOGNN N D Mig Co San jose Calif 00000 Cooltron Oakland Calif 000WW California Eastern Lab Burlington Calif 000YY S K Smith Co Los Angeles Calif From FSC Handbook Supplements H4 1 Dated JULY 1965 H4 2 Dated NOV 1962 6 13 Model 493A 495A Appendix I MANUAL CHANGES This manual describes Model 493A and 495A instruments with serial numbers prefixed 350 Change the manual as indicated below for serials indicated For other serials either a different manual or a change sheet is required If the prefix on your instrument is not specifically mentioned either here or ona change sheet the correct information can be obtained from your Hewlett Packard Field Office Instrument Serial Prefix Make Manual Changes Instrument Serial Prefix Make Manual Changes CHANGE 1 The turn on time delay is 3 minutes rather than 90 seconds Change reference to this del
25. NORTH CAROLINA 0 Box 5187 1923 North Main Street High Point 27262 Tel 919 882 6873 TWX 510 926 1516 OHIO 5579 Pearl Road Clevetand 44129 Tel 216 884 9209 TWX 810 421 8500 3460 South Dixie Drive Dayton 45439 Tel 613 298 0351 TWX 810 459 1925 OKLAHOMA 2919 United Founder Boulevard Oklahoma City 73112 Tei 405 848 2801 TWX 910 830 6862 OREGON Westhills Suite 158 4475 S W Scholls Ferry Road Portland 97225 Tel 503 292 9171 TWX 910 464 6103 PENNSYLVANIA 2500 Moss Side Boulevard Monrceville 15146 d Tel 412 271 0724 TWX 710 797 3650 144 Elizabeth Street West Conshohocken 19428 Tel 215 248 1600 828 6200 TWX 510 660 8715 TEXAS P 0 Box 1270 201 Arapaho Rd Richardson 75080 Tel 214 231 1601 TWX 910 867 4723 0 Box 22813 4242 Richmond Avenue Mouston 77027 Tel 713 667 2407 TWX 910 881 2645 GOVERNMENT CONTRACT OFFICE 225 Billy Mitchell Road San Antonio 78226 Tel 512 434 4171 TWX 910 871 1170 UTAH 2890 South Main Street Salt Lake City 84115 Tei 801 486 8166 TWX 910 925 5681 VIRGINIA P 0 Box 6512 2111 Spencer Road Richmond 23230 Tel 703 282 5451 TWX 710 956 0157 WASHINGTON a33 108th N E Bellevue 98004 Tei 208 454 3971 TWX 910 443 2303 FOR U S AREAS LISTE Contact the regional office near est you Atlanta Georgia North Hollywood California Paramus New Jersey Skokie Hinois Their co
26. Products Corp Dayton Ohio 86684 Radio Corp of America Electronic Comp amp Devices Div Harrison N J 87034 Marco Industries Anaheim Calif 87216 Philco Corporation Lansdale Division Lansdale 87473 Western Fibrous Glass Products Co an Francisco Calif 87664 Van Waters amp Rogers inc Francisco Calif 87930 Tower Mfg Corp Providence R 1 88140 Cutler Hammer Inc Lincoln IH 88220 Gouid National Batteries Inc St Paul Mina 88421 Federal Telephone amp Radio Corp Clifton NJ 88698 General Mills Inc Buffalo N Y 89231 Graybar Electric Co Oakland Calif 89665 United Transformer Co Chicago II 90179 US Rubber Co Consumer ind amp Plastics Prod Div Passaic N J 90970 Beating Engineering Co Francisco Calif 31260 Connor Spring Co San Francisco Calif 91345 Miller Dial amp Nameplate Co El Monte Calif 91418 Radio Materials Co Chicago ill 91506 Augat inc Attleboro Mass 91637 Date Electronics lac Columbus Nebr 91662 Eico Corp Willow Grove Pa 91737 Gremar Mfg Co inc Wakefield Mass 31827 K F Development Co Redwood City Calif 91929 Honeywell inc Micro Switch Div Freeport HI 91951 Nahm Bros Spring Co Oakland Calif 92180 Tru Connectos Corp Peabody Mass 92367 Elgeet Optical Co Inc Rochester N Y 92196 Universal industries inc City of industry Calif 82607 Tensolite Insulated Wire Co inc Tanytown N Y 93332 Sylvania Electric Prod in
27. RAKAR Athens Mm Svetsarvagen 7 Telex 84413 o Tel 53 83 60 Soma 1 WUGUSLAGIA IRELAND Cable HEWPACK Oslo Tel 98 12 50 Sean so Hewlett Packard Ut Telex 6621 be a 83 avenue des Mimosas 224 Bath Road P russols 15 Belglum Stough Bucks England PORTUGAL Telar 10721 Tel 34 33 32 34 26 19 Tel Slough 33341 Rua Rodrigo da Fonseca 103 SWITZERLAND Cable BELRAMEL Brussels Cable HEWPIE Slough P O Box 2531 HEWPAK AG Telex 21790 Telex 84413 Lisbon 1 Zurcherstrasse 20 Tel 68 60 72 8952 Schlieren when NOT ISTED HALY Cable TELECTRA Lisbon Zurich Hewlett Packard Italiana S A 1598 Tel 051 98 18 21 Hewlett Packard S A Viale Lunigiana 46 Cable HEWPACKAG Zurich 54 Route des 20125 Milan Telex 53933 1211 Geneva Switzertand Tel 69 15 84 Tet 022 42 81 50 Cable HEWPACKIT Milan Cabie HEWPACKSA Geneva Telex 32046 Telex 2 24 86 IRAN KENYA PAKISTAN WEST THAILAND Telecom Ltd R J Tilbury Ltd Mushko amp Company Ltd The International P 0 Box 1812 P 0 2754 Oosman Chambers Engineering Co Ltd 230 Kh Saba Shomali Suite 517 518 Victoria Road P 0 Box 39 Teheran Hotel Ambassadeur Karachi 3 814 Sukhumvit Road Tel 43850 48111 Nairobi Tel 51027 52927 Bangkok Cable BASCOM Teheran Tel 25670 26803 68206 58196 Cable COOPERATOR Karachi Tel 910722 Cable ARJAYTEE Nairobi Cable GYSOM Bangkok ISRAEL SINGAPORE Electronics amp Engineering KOREA Mechanical and Combustion UGANDA Div of Motoro
28. Shipping instructions to your nearest Hewlett Packard Sales and Service Office or to in Western Europe Rest of World Hewlett Packard S A Hewlett Packard Co 54 Route des Acacias International Marketing Dept Geneva Switzerland 1501 Page Mill Road Telephone 022 42 81 50 Palo Alto California 94304 U S A Telex 2 24 86 Telephone 415 326 7000 Cable HEWPACKSA Telex 033811 Cable HEWPACK Microwave tubes supplied by the Hewlett Packard Company either as original or replacement for use in Hewlett Packard instruments are actually warranted by the tube manufacturer and not by Hewlett Packard However all warranty claims on tubes obtained from us either as original or replacement will be processed by Hewlett Packard In the event of failure you should purchase a new tube and return your old tube immediately to Hewlett Packard Credit allowances will be passed on to you upon receipt of the defective tube For your convenience warranty claims for all microwave tubes supplied by the Hewlett Packard Company may be made on this singie form merely fill out the information on the reverse side and return this form along with the defective tube to your Hewlett Packard Sales and Service Office or to Hewlett Packard Please be sure each Space on the form is filled in lack of complete information may delay processing of your claim Each tube manufacturer has his own warranty policy Copies of individual Conditions of Warranty are avai
29. only amplifier MY mylar RMS root mean square F farads ROT rotary beat frequency oscillator FH flat head NC normally closed BE CU lt beryllium copper FILH fillister head NE neon BH binder head FXD fixed NIPL nickel plate AB ay EY BP bandpass NO normally open SECT a sectionte BRS brass GE germanium NPO negative positive zero SEMICON E amico nani BWO backward wave oscillator GL glass zero temperature dc rus GRD ground ed coefficient Me CER ceramic NSR not separately SE ue CMO cabinet mount only H henries replaceable AB eos COEF coefficient HEX hexagonal NT co ail COM common HG mercury OBD order by description SUA ess 8558 COMP composition HR hour s OH oven head CONN cohnector OX oxide TA tantalum cadmium plate IMPG impregnated TD time delay CRT cathode ray tube INCD incandescent P peak titanium INS insulation ed PC printed circuit board TOG toggle se deposita cortos PF picofarads TOL tolerance EIA Tubes or transistors kilo 1000 10712 farads TRIM trimmer meeting Electronic PH BRZ phosphor bronze TWT traveling wave tube Industries Associa LIN linear taper PIV peak inverse voltage s tion standards will LK lock POLY polystyrene U micro 107 normally result in LOG logarithmic taper POR porcelain instrument operating LPF low pass filter POS position s VAC vacuum withi
30. removal paragraph 5 20 b Replace twt in the instrument with twt in the range desired 4 8 gc or 7 12 4 gc See twt installation paragraph 5 21 Note Conversion from one frequency range to an other may require switching of high voltage transformer leads Refer to mote on reg ulated high voltage power supply schematic c Refer to performance check procedure para graph 5 34 and check instrument for specifications d Replace the identification plate on the instrument with one indicating the frequency range and model number of the new twt installed 01280 2 Model 493A 495A BLK feat eat tt o we 5 2 LI wi gt GRY WHT t t R2 1 33K RTI TAN 18 15 i nie Gace 230 30v S2 8 2 NOTES AGE i SEE A HIGH VOLT e SUPPLY SCHEMATI owi 2 SWITCHES ARE SH ws CONDITION RELA IN DE ENERGIZED PICK 3 CAPACITANCE IN AMS RESISTANCE IN ATE OTHERWISE INDIC IN PLUG ED 5 me ETCH 8 P O PART OF 493A 495A FIL 359 01280 4 LU 20 2UF JF 334 100 ESA D ITF 01280 3 RED RIO R29 Ti s BLU IK CR6 EL 1 470K lt 8 lt cod SERIES 210 40UF R26 REGULATOR ABSC vi v2 2 6 RED WHT i P O 2 RII RI2 18 BLU ova 1 UF A ORN la
31. 0 1 1 0490 0010 RELAY SPDT 115 AC 77542 SM 4107 1 i 0490 0038 RELAY DPDT SA RESISTIVE 04298 GHA 2C 6VAC 1 0490 0059 RELAY DPDT 97542 KALIAY 6 3 ii 0490 0135 RELAY SPDT THERMAL 70565 6N0 180T 1 NE E UP 495A 16D ASSY RF POWER INPUT OUTPUT CABLE 28480 495A 16D 2 495 65 ASSY RECTIFIER BOARD 28480 495A 65A 11 495A 65A 1 BLANK PRINTED CIRCUIT BOARD 28480 495A 65A 1 t 495A 658 ASSY HV REGULATOR BOARD 28480 495A 658 1 i 495A 65B 1 BLANK PRINTED CIRCUIT BOARD 28480 495A 658 1 p 495 650 ASSY MODULATOR BOARD 28480 495A 650 1 495A 650 1 8LANK PRINTED CIRCUIT BOARD 28480 495A 65D 1 1 495A 65E ASSY TWT TEST 28480 495A 65E 1 495A 65E 1 BLANK PRINTED CIRCUIT BOARD 28480 495A 65E 1 1 0687 1011 R FXD COMP 100 OHM 10 1 2W 01121 1011 1 0687 1021 R FAD COMP 1000 OHM 10 1 2W 01121 1021 2 0687 1041 R FXD COMP LOOK OHM 10 1 2W 01121 E8 1041 1 0687 2251 R FXD COMP 2 2 MEGOHM 10 1 2W 01121 2251 1 0687 5551 R FXD COMP 33K OHM 10 1 2W 01121 5551 5 0687 5911 R FXD COMP 390 OHM 10 1 2W 01121 5911 1 0687 4751 R FXD COMP 47K OHM 10 1 2W 01121 EB 4731 1 0687 4741 R FXD COMP 470K OHM 10 1 2W 01121 EB 4741 2 0687 5601 R FXD COMP 56 OHM 10 1 2W 01121 5601 1 zi See introduction to this section 6 8 01280 5 Model 493A 495A Section VI Table 6 2 Table 6 2 Replaceable Parts Cont d amp Stock No Description Mfr Mf
32. 0 is active the 1952 0036 can be used as an alternate and 1952 0019 and 0023 are obsolete The obsolete tubes must be fan cooled when using the active or al ternate tubes delete air duct ass y 00495 6001 since forced air on the collector end of these tubes is not required DESCRIPTION HP PART NO STANDARD Front Panel 00489 00002 Front Side Cover 2 5000 8711 Rear Side Cover 2 5000 8709 Top Cover Assy 5060 8589 Bottom Cover Assy 5060 8713 Rack Mount Kit 5060 8740 Handie Retainer Assy 5060 8737 L le OPTION A85 5060 0775 OPTION X95 ge 5000 0739 5000 0738 5060 0740 S060 0752 AAA 5060 0766 Manual Changes Model 493A 495A Manual HP Part No 00493 90004 Page 5 CATHODE 52 CURRENT SWITCH ADJUST 85 CHA B FILAMENT 118 230 ADJUST R306 HIGH VOLTAGE LEVEL ADJUST R57 HIGH VOLTAGE h 1 CAUNON EN BOARD Ai NES y i MEE 9 Low FREQUENCY v7 A ADJUST 411 GAIN LIMIT K4 ADJUST R418 El BOARD E 3 1 adi MODULATOR GROUND EIA s BOARD A400 HEATER EIB pp 82926 HTR CATH EIC s ee CR GRID CATHODE EIE CR 303 ANODE EIF HELIX 16 T2 M20 METER C301A 8 SENSITIVITY COLLECTOR EiH CIO2A B d CONNECT DC CLIP ON MILLAMMETER PROBE HERE TO MEASURE HELIX CURRENT Figure 5 3 Model 493A Top View
33. 0334 00348 00373 00656 00779 00781 00815 00853 00866 00831 00929 01009 91121 01255 01281 01295 01343 91589 01936 01361 02114 02286 02560 82135 02771 02777 03508 03705 0379 03877 03888 03954 04009 04013 04222 04354 04404 04651 04713 0032 04773 04796 04811 04870 05006 05277 05347 05593 05616 05624 05728 09015 TABLE 6 3 CODE LIST OF MANUFACTURERS Section VI The following code numbers are from the Federal Supply Code for Manufacturers Cataloging Handbooks H4 1 Name to Code and H4 2 Code to Name and their latest supplements The date of revision and the date of the Supplements used appear at the bottom of each page Alphabetical codes have been arbitrarily assigned to suppliers not appearing in the H4 Handbooks Manufacturer Address U S A Common McCoy Electronics Sage Electronics Corp Any supplier of U S Mount Holly Springs Pa Rochester N Y Cemco Inc Danielson Conn Humidial Colton Calif Microtron Co Inc Valley Stream N Y Garlock Iac Electronics Products Div Aetovox Corp Camden N J New Bedford Mass Amp Inc Harrisburg Pa Aircraft Radio Corp Boonton N J Northern Engineering Laboratories inc Burlington Wis Sangamo Electric Co Pickens Div Pickens S C Los Angeles Calif Los Angeles Calif Livingston N J Brockton Mass Milwaukee Wis Beverly Hilis Calif Lawndale Calif Goe Engineering Co Catt
34. 1 0727 0149 fxd 7 96K ohms 1 1 2W 19701 DC1 2CR5 obd 11 0727 0226 R fxd dep 250K ohms 1 1 2W 19701 DC1 2CR5 obd 11 0727 0255 fxd 800K ohms 1 1 2W 19701 DC1 2AR5 obd 11 0727 0292 R fxd dep 3M 2195 1 2W 19701 DC1 2CR5 obd 1 1 0730 0093 R fxd dep 516K ohms 195 1W 19701 CD1R5 obd 1 1 1902 0163 Diode 28480 1902 0163 1933 0005 Tube electron 7734 07138 7734 l7 1940 0007 Tube electron OB2 86684 obdst 11 2100 0144 R var comp 250K ohms 11237 Type UPE 70 obd 1 i 2 01280 2 Model 493A 495A Appendix I OUTPUT AMPLIFIER v 04 6EW6 CHO RI27 RI25 RI28 CURRENT SINK RI26 CRIO6 Cio6 CRIO4 mes CRIOS HIGH FREQUENCY COMP RI24 8122 RUS HIGH FREQUENCY COMP DIF FERENTIAL C108 AMPLIFIER cios 103 RII m CRIO3 RIIS Ril4 CRIO7 RIO6 REFERENCE TUBE vio2 GAIN LIMIT RI2 RIO4 RU RIOS R129 RIO SERIES REGULATOR CONTROL TUBE VIOI RIO8 350V ADJUST 7734 RI3O 5 10 40 cio4 RIO9 Figure 5 13 Modulator Board For Change 3 01280 2 i 3 Model 493A 495A Appendix I 6 pI G POL 101A 931721 ISIMYJHLO 21 5531 SWHO Ni JINVISISIM OSI 04 SqQv8sv303id NI JINVISIVAVI 1010
35. 19701 0 1 20 6 0727 0252 R FXO DEPC 740K 19701 DC 1 2 1 0727 0266 R FXD DEPC 975K 19701 DC 1 20 1 0727 0276 R FXO DEPC 1 MEGOHM 1 1 2W 19701 DC 1 26 3 0727 0278 R FXD DEPC 1 JEGOHM 1 1 2W 19701 DC 1 2C 0727 0282 R FXD DEPC GOHM 1 1 2W 19701 DC 1 2 1 5 1 1 0727 0285 R FXD DEPC 1 66 MEGOHM 1 1 2W 19701 1 2 1 0727 0286 R FXD DEPC 1 88 MEGOHM 1 1 2W 19701 DC 1 20 1 0727 0332 R FXD DEPC 150K OHM 1 1 2W 19701 CF 1 2 1 0750 0096 R FXD DEPC 683 7K OHM 1 14 19701 OCL d 0758 0026 R FXD MET FLM 68K OHM 5 1 2w 02115 20 0765 0008 RiFXD MET FLM 68K OHM 10 2W 07115 C 2S 2 0767 0010 R FXD MET FLM 15K OHM 5 2W 07115 LP1 3 k 0775 0010 R FXD MET FLM 85K OHM 5 5W 07115 LPI 5 1 0812 0019 R FXD WW 0 55 OHM 5 2W 35434 5 2 0813 0020 R FXO WW 100 OHM 10 5W 94310 FRL 5 1 0816 0015 R FXD WW SO OHM 10 LOW 155434 GC10 50 d 0839 0017 THERMISTOR 250 OHM 10 24446 10 951 Ak 1120 0131 METER 1 MA 06555 MODEL E 25 i 1200 0049 SOCKET TUBE 7 PIN 71785 111 51 11 096 1 1200 005 gt SOCKET TUBE 7 PIN 71785 111 51 11 4 1200 0062 SOCKET TUBE 9 PIN 71785 121 51 11 060 5 1200 0084 SOCKET TUBE 171789 101 04 11 100 2 See introduction to this section 01280 3 6 9 Section VI Model 4934 495 Table 6 2 Table 6 2 Replaceable Parts Cont d Stock No Description Mfr Mir Part No i H 1250 0085
36. 4 R2 0687 3331 R FXD COMP 33K OHM 10 1 2W R3 THRU R9 NOT ASSIGNED R10 0695 1021 R FXD COMP 1000 OHM 10 2W R11 0815 0020 R FXD WW 100 OHM 10 SW R12 THRU R25 0692 4745 R FXD COMP 470K OHM 5 2W R26 0690 1041 R FXD COVP LOOK OHM 10 1W R27 0690 1011 R FXD COMP 100 OHM 10 1W R28 0690 1011 R FXD COMP 100 OHM 10 1W R29 0687 4741 R FXD COMP 490K OHM 10 1 2W R30 0687 1021 R FXD COMP 1000 OHM 10 1 2W R31 0689 5115 R FXD COMP 510 OHM 5 1W R32 0687 1021 R FXD COMP 1000 OHM 10 1 2w R35 0689 5115 R FXD COMP 510 OHM 5 1W R34 0687 1011 R FXD COMP 100 OHM 10 1 2W R35 0690 2241 R FXD COMP 220K OHM 10 1W R36 0687 4751 R FXD COMP 49K OHM 10 1 2W R37 0690 1011 R FXD COMP 100 OHM 10 1W R38 0727 0266 R FXD DEPO 975K OHM 1 1 2W R39 0727 0278 R FXD DEPC 1 15 MEGOHM 1 1 2W R40 0690 2241 R FXD COMP 220K OHM 10 1W R41 THRU R48 0695 4751 R FXO COMP 49K OHM 10 2W R49 0693 3331 R FXD COMP 33K OHM 10 2W R50 0693 2231 R FXD COMP 22K OHM 10 2W R51 0687 2251 R FXD COMP 2 2 MEGOHM 10 1 2W R52 0750 0096 R FXD DEPC 682 7 OHM 1 1W R55 2100 0100 R VAR COMP 5 5 MEGOHM 30 LIN 1 4W R54 0727 0115 R FXD DEPC 2000 OHM 1 1 2W FACTORY SELECTED COMP TYPICAL VALUE GIVEN R55 0727 0240 R FXD DEPC 405K OHM 1 1 2W FACTORY SELECTED COMP TYPICAL VALUE GIVEN R56 0727 0245 R FXD DEPC 500K OHM 1 1 2W R57 2100 0100 R VAR COMP 5 5 MEGOHM 30 LIN 1 4W R58 0727 0240 R FXD DEPC 405K OHM 1 1 2W R59 0727 0246 R FXD DEPC 600K OHM 1 1 2W R6 0727 0246 R FXD DEPC 600K OHM 1
37. 44 5400 TWX 710 862 0850 0 Box 1648 2 Choke Gherry Road Rockville 20850 Tel 301 948 6370 TWX 710 828 9684 MASSACHUSETTS 32 Hartwell Ave Lexington 02173 Tel 301 948 6370 10 332 0382 MICHIGAN 24315 Northwestern Highway Southfield 48075 Tet 313 353 9100 TWX 810 232 1532 MINNESOTA 2459 University Avenue St Paul 55114 Tel 612 645 9461 TWX 910 563 3734 MISSOURI 9208 Wyoming Place Kansas City 64114 Tel 816 333 2445 TWX 910 771 2087 2812 South Brentwood Blvd St Louis 63144 Tel 314 644 0220 TWX 810 760 1670 NEW JERSEY W 120 Cetury Road Paramus 07652 Tel 201 265 5000 TWX 710 990 4951 10508 N Kings Highway Cherry Hill 08034 Tei 609 667 4000 TWX 710 892 4945 NEW MEXICO P O Box 8366 Station C 6501 Lomas Boulevard N I Athuquerque 87108 Tet 505 255 5586 TWX 910 989 1665 156 Wyatt Drive Las Cruces 88001 Tel 505 526 2485 TWX 910 983 0550 NEW YORK 1702 Central Avenue Albany 12205 Tel 518 869 8462 TWX 710 441 8270 1219 Campville Road Endicott 13764 Tel 507 254 0050 TWX 510 252 0890 82 Washington Street Poughkeepsie 12601 Tel 914 454 7330 TWX 510 248 0012 39 Saginaw Drive Rochester 14623 Tel 716 473 9500 TWA 510 253 5981 1025 Northern Boulevard Roslyn Long Island 11576 Tel 516 869 8400 TWX 510 223 0811 5858 East Mofloy Road Syracuse 13211 Tel 315 454 2486 TWX 710 541 0482
38. 5 Change R39 to R FXD MET FILM 1 1 Megohm 1 1 2W HP Part No 0757 0139 Change R54 to R FXD MET FILM 2000 ohm 1 1 2W HP Part No 0757 0824 ChangeR55 to R FXD MET FILM 402K ohm 1 1 2W HP Part No 0698 4022 Retain the asterisk to indicate FACTORY SELECTED PART TYPICAL VALUE GIVEN Change R56 to R FXD MET FILM 500K ohm 1 1 2W HP Part 0757 0052 Change R58 to R FXD MET FILM 402K ohm 1 1 2W HP Part No 0698 4022 Change R59 R60 R61 R62 R63 and R64 to R FXD MET FILM 604K ohm 1 1 2W HP Part No 0757 0155 Change R65 to R FXD MET FIIM 215K ohm 1 1 2W HP Part No 0757 0127 Change R67 to R FXD MET FILM 1 Megohm 1 1 2W HP Part No 0757 0059 Change R68 to R FXD MET FILM 500K ohm 1 1 2W HP Part No 0757 0052 Page 5 15 Figure 5 12 and Page 6 5 Table 6 1 Change R202 and R203 to R FXD MET FILM 1000 ohm 1 1 2W HP Part No 0757 0159 Page 5 17 Figure 5 14 and Page 6 5 Table 6 1 Change R404 to R FXD MET F LM 750K ohm 1 1 2W HP Part No 0757 0137 Change R406 to R FXD MET FILM 215K ohm 1 1 2W HP Part No 0757 0127 Change R413 to R FXD MET FILM 1 5 Megohm 1 1 2W HP Part No 0757 0156 Change R415 to R FXD MET FILM 12 1K ohm 19 1 2W HP Part No 0757 0841 Change R416 to R FXD MET FILM 287K ohm 1 1 2W HP Part 0757 0154 Change R419 to R FXD MET FILM 100K ohm 1 1 2W HP Part No 0757 0367 Change R420 to R FXD MET FILM
39. 5 R431 0727 0237 R FXD DEPC 396K OHM 1 1 2W RTL 0839 0017 THERMISTOR 250 OHM 10 1 3101 0041 SWITCH TOGGLE 3 POSITION 52 3101 0034 SWITCH SLIOE APOT Tl 9100 0153 TRANSFORMER POWER I T2 9100 0152 TRANSF ORMER POWER V1 1923 0048 ELECTRON TUBE PENTODE 8068 1925 0048 ELECTRON TUBE PENTODE 8068 1940 0004 ELECTRON TUBE 042 VOLTAGE REGULATOR va 1940 0004 ELECTRON TUBE 0A2 VOLTAGE REGULATOR v5 1933 0004 ELECTRON TUBE PENTODE 6U8 V6 1923 0048 ELECTRON TUBE PENTODE 8068 v 1952 0016 ELECTRON TUBE TWT 4 8GC MEC 4495A ONLY v 1952 0019 ELECTRON TUBE TWT 7 12 4 GC y SYL VANTA amp O5A ONLY OR v 1952 0010 ELECTRON TUBE TWT 7 12 4GC MEC A495A ONLY 1952 0017 ELECTRON TUBE TWT 4 8GC SYLVANTA 493A ONLY v8 1925 0045 ELECTRON TUBE PENTODE GEWG v9 THRU V4OO NOT ASSIGNED v401 1933 0005 ELECTRON TUBE PENTODE 7734 v402 1940 0001 ELECTRON TUBE 5651 v403 1933 0004 ELECTRON TUBE PENTODE 6U8 1933 0004 ELECTRON TUBE PENTODE 608 wl 8120 0078 ASSY POWER CABLE we 495A 16D ASSY RF POWER OUTPUT CABLE MEC TWT C X B8AND ONLY 5 495 160 ASSY RF POWER OUTPUT CABLE MEC TWT C X BAND ONLY XK1 1200 0062 SOCKET TUBE 9 PIN XK2 NOT ASSIGNED 1200 0049 SOCKET TUBE 7 PIN 1200 0084 SOCKET TUBE 2 1200 0084 SOCKET TUBE 1200 0053 SOCKET TUBE 7 PIN 1200 0053 SOCKET TUBE 7 PIN XV5 1200 0062 SOCKET TUBE 9 PIN XV6 1200 0084 SOCKET TUBE Pe XV NOT ASSIGNED xv8 2100 0053 SOCKET TUBE PIN
40. 6 Santiago Tet 31 890 490 505 COLOMBIA instrumentacion Henrik A Langebaek amp Cia Ltda Carrera 2 48 59 Apartado Aereo 6287 Bogota 1 D E Tel 45 78 05 45 55 46 Cable AARIS Bogota COSTA RICA Lic Alfredo Gallegos Gurdi n Apartado 3243 San Jos Tel 21 86 13 Cable GALGUR San Jos Post Office Box 3199 Quito Tel 12496 Cable HORVATH Quito EL SALVADOR Electr nica Apartado Postal 1589 27 Avenida Norte 1133 San Salvador Tel 25 74 50 Cable ELECTRONICA San Salvador GUATEMALA Olander Associates Latin America Apartado 1226 7a Calle 0 22 Zona 1 Guatemala City Tel 22812 Cable OLALA Guatemala City Apartado Postal 12 832 Eugenia 408 Dept 1 Mexico 12 D F Tel 43 03 79 36 08 78 NICARAGUA Roberto Ter n 6 Apartado Posta 689 Edificio Ter n Managua Tel 3451 3452 Cable ROTERAN Managua PANAMA Electr nica Balboa S A P 0 Box 4929 Ave Manuel Espinosa No 13 50 8ldg Alina Panama City Tel 30833 Cable ELECTRON Panama City Miraflores Casilla 3061 Lima Tel 50346 Cable FEPERU Lima PUERTO RICO San juan Electronics Inc 0 Box 5167 Ponce de Leon 154 Pda 3 Pta de Tierra San Juan P R 00906 Tel 174 725 3342 Cable SATRONICS San Juan URUGUAY Pablo Ferrando S A Comercial e Industrial Avenida Italia 2877 Casilla de Correo 370 Montevideo Tel 40 3102 Cabe RADIUM Montevideo Edificio Aris n Office No 6 Avda Fran
41. 60 0015 C FXD MY 0 1 UF 10 400VDCW C110 THRU C200 gt NOT ASSIGNEO C201 0150 0084 C FXD CER 0 1 UF 80 20 50VOCW C202 0160 0056 C FXD PAPER 0 047 UF 10 1000VDCW C205 THRU C300 NOT ASSIGNED C301 0180 0028 C FXD ELECT 2 X 1500 UF 15VDCW C302 0180 0061 C FXD ELECT 100 UF 100 10 15VDCW C505 0180 0065 C FXD ELECT 500 UF 100 1096 3VDCW C304 THRU C400 NOT ASSIGNED C401 0150 0052 C FXD CER 0 05 UF 20 400VDCW C402 0150 0052 C FXD CER 0 05 UF 20 400VDCW C403 0140 0149 C FXD MICA 470 PF 5 300VDCW C404 0140 0208 C FXD MICA 680 PF 5 500VDCW C405 0120 0015 C VAR CER 2 12 PF NPO C406 0140 0205 C FXD MICA 30 PF 5 500VDCW C407 0150 0011 C FXD 1 5 PF 20 500VDCW C408 0140 0194 C FXD MICA 110 PF 5 500VDCW C409 0140 0149 C FXD MICA 470 PF 5 300VDCW CR6 THRU 1901 0050 SEMICON DEVICE DIODE JUNCTION CR20 1901 0050 SEMICON DEVICE DIODE JUNCTION See introduction to this section 6 2 01280 3 01280 4 Model 493A 495A Section V Table 6 1 Table 6 1 Reference Designation Index Cont d Cireuit EDT Reference Stock No Description Note CR21 NOT ASSIGNED CR22 1901 0029 SEMICON DEVICE DIODE SILICON CR25 THRU CR100 NOT ASSIGNED CR101 1901 0030 SEMICON DEVICE 0100 JUNCTION CR102 1901 0030 SEMICON DEVICE DIODE JUNCTION CR103 THRU CR300 NOT ASSIGNED CR201 1901 0025 SEMICON DEVICE DIODE SILICON CR302 1901 0032 SEMICON DEVICE DIODE 1N3209 CR205 1901 0032 SEMICON DEVICE 0100 1N3209 CR304 1902 0142 SEMICON DEVI
42. 796 up 1 through 12 1231A see below 1 through 13 1545A All i4 ERRATA On the title page add Manual Stock No 00493 90004 Page 1 0 Tabie 1 1 under AMPLITUDE MODU LATION Change Sensitivity specification to read A modulation input of 20V peak or greater reduces the RF output by more than 20 dB from dc to 50kHz Above 50kHz modulation de creases approximately 6 dB per octave Under GAIN VARIATION WITH FREQUENCY Change Small Signal specification to read S dB or less across any 10 of the band except the 495A which is across any 300MHz of the band 10 dB or less across the band except the 493A which is 12 dB or less across the band Page 4 6 Delete all entries reprint of previous page Page 5 14 Figure 5 11 Indicate location provided for R69 beside R34 and indicate location provided for R66 beside C16 Page 5 15 Figure 5 12 Indicate on schematic that R66 and R69 are Selected for correct Helix overload trip cur rent R69 is connected between pin 4 of helix relay K3 and the junction of resistors R37 and R68 Complete the connection be tween terminals EIC and EIE Delete Notes 6 and 7 Add Pin 7 beside the ORN lead of T1 and change the voltage table below to show the BLU lead to pin 10 for 1800 2400 volts pin 11 for 2400 2700 volts the ORN lead remains connected to pin 7 R53 Change MEC to read anode type TWT V7 Delete wire colors and references to SYL T
43. 9019 6310N NS ONES ines me an ET re 1HA 0l 1938 ADSL Si V iv em ol L o ST old eon non 40 nae Ll somo Pene A BN 1 242 vens 50 3 4402 s arvoi 90525 B 47 A rd Bale ray 32N383438 VS AOSE 3902 20183 WW tuzi 820127r 099 xs 1010 8 28 4 X06 w DI INIS io nen i E B ze M doe 12 son ON LNOD H x009 EA 7 E oo i 4 ua3ididdWv 2 7 anso n T ifdino E zf M 54 Ps d eum 50 1 Nb Ave din Ln yros 28 NOivin93u H pos id 531935 22 22 55 a 1008 ase xose sug biu 218 ine BOLT INGO ionv gt 2 st ani Y asl 1M1 ONYE X 2 VINGATAS 0451 bem lt SAMOA OOF 938 ADOS 18 034 01280 2 WARRANTY CLAIM AND ADJUSTMENT PROCEDURE for microwave tubes supplied by the HEWLETT PACKARD COMPANY for use in Hewlett Packard instruments The procedure described below is for use within the United States For warranty claims arising outside the U S A before returning the tube fill out the form on the reverse side and send it with a request for
44. 93 1531 R fxd comp 15K ohms 10 2W R107 0727 0246 R fxd 600K ohms 1 1 2W R108 2100 0094 R var comp lin 50K ohms 30 1 4W R109 0727 0226 R fxd dep 250K ohms 1 1 2W 01280 2 1 1 Appendix I Model 493A 495A MANUAL CHANGES Cont d Table 6 1 cont d R110 0693 8231 R fxd comp 82K ohms 10 2W Rll 0687 4731 R fxd comp 47K ohms 10 1 2W R112 0687 1231 R fxd comp 12K ohms 10 1 2W R113 0693 6831 R fxd comp 68K ohms 10 2W R114 0690 1041 R fxd comp 100K ohms 10 1W R115 R116 0693 2731 fxd comp 27K ohms 10 2W R117 0693 1531 R fxd comp 15K ohms 10 2W R118 0727 0292 R fxd 1 1 2W R119 0727 0255 fxd 800K ohms 195 1 2W R121 2100 0144 R var comp 250K ohms R122 0727 0208 R fxd dep 100K ohms 1 1 2W R123 0730 0093 R fxd dep 516K ohms 4195 1W R124 0727 0149 R ixd dep 7 96K ohms 1 1 2W R125 0727 0245 R fxd 500K ohms 1 1 2W R126 R127 0773 0010 R fxd mfgl 85K ohms 595 5W R128 0687 1521 R fxd comp 1 5K ohms 10 1 2W E R129 0687 4741 R fxd comp 470K ohms 10 1 2W E R130 0686 6845 R fxd comp 680K ohms 5 1 2W 5 101 1933 0005 Tube delectron 7734 m V102 1940 0007 Tube electron OB2 V103 1933 0004 Tube electron 6U8A V104 1923 0043 Tube electron 6EW6 101 1200 0048 Socket tube 9 minat XV102 1200 0047 Socket tube 7 pin minat w ears for pc XV103 1200
45. 95 Micro wave Amplifiers regardless of serial regard less of serial prefix CHANGE 11 The standard colors for this instrument are now mint gray for front and rear panels and olive gray for all top bottom side and other external sur faces Option X95 designates use of the former Color scheme of light gray and blue gray Option A85 designates the use of a light gray front panel with olive gray used for all other external surfaces New part numbers are shown on next page Manual Changes Model 493A 495A Manual HP Part No 00493 90004 Page 4 PCHANGE 12 In the parts list Change Q301 to 1850 0098 change CR22 to 1901 0330 change Cll to 0160 4050 change CR401 CR405 to 1901 0330 and delete CR22 and R66 Inthe Model 495A only change CR402 403 and 404 to 1901 0033 CHANGE 13 This change applies to Model 493A units with serial numbers above 1231A 1925 and Model 495A units with serial numbers above 12314 1975 Change G16 from 50 amp F 25V Part 0180 0058 to 1004A 25V 0180 0094 and change C15 from 0 0056 0160 0384 to 0 Olp F 0160 2568 14 This change supersedes Change 2 to define which replacement TWT part numbers are presently activ which are usable as alternates and which are obsolete For the Model 493A 1952 0039 is tive the 1952 0035 can be used as an alternate and 1952 0017 0022 and 0031 are obsolete For the Model 495A the 1952 004
46. At 1 watt output 6 db or less across the band Small Signal 5 db or less across any 10 of the band except the 495A which is across any 300 MHz of the band 10 db orless across the band except the 493A which is 12 db or less across the band GAIN VARIATION WITH LINE VOLTAGE 1 db or less for 10 variation from rated line voltage MAXIMUM RF INPUT 100 mw INPUT OUTPUT CHARACTERISTICS Impedance 50 ohms SWR 2 5 or less cold CONNECTORS Type N female AMPLITUDE MODULATION Sensitivity A modulation input of 20 V peak or greater reduces the RF output by more than 20 db from to 50 kc Above 50 ke modula tion decreases approximately 6 db per octave Residual AM At least 45 db below modulated output NOISE Noise Figure 30 db or less Noise Power Output 0 dbm or less FRONT PANEL CONTROL Gain varies grid voltage METER Monitors cathode current DIMENSIONS hores epis ET sia Er o Gun da T sy 0 i ems Beat WEIGHT Net 40 lb 18 kg shipping 53 1b 23 9 kg POWER 115 230 volts 410 50 to 60 cps ap proximately 225 watts ACCESSORIES FURNISHED Power Cord 7 1 2 ft long 2290 mm NEMA plug Hardware for converting cabinet to EIA conform ing rack mount ACCESSORIES AVAILABLE 11501A Cable type N male to type N female 6 ft long 1830 mm 11500A Cable type N male connectors 6 ft long 1830 mm 1 0 01280 4
47. CE DIODE SILICON BREAKDOWN CR305 1902 0163 SEMICON DEVICE DIODE SILICON BREAKDOWN CR206 1901 0025 SEMICON DEVICE DIODE SILICON CR207 1902 0025 SEMICON DEVICE DIODE SILICON CR308 1902 0165 SEMICON DEVICE DIODE SILICON BREAKDOWN CR209 THRU CR400 NOT ASSIGNED CR4O1 1901 0029 SEMICON DEVICE 0100 SILICON CR402 1901 0025 SEMICON DEVICE DIODE JUNCTION CR403 1901 0025 SEMICON DEVICE DIODE JUNCTION CR404 1901 0025 SEMICON DEVICE DIODE JUNCTION CR405 1901 0029 SEMICON DEVICE DIODE SILICON CRAOG 1902 0056 SEMICON DEVICE DIODE SILICON 051 1450 0048 LAMP PILOT NE2H 052 1450 0048 LAMP PILOT 2 1 0360 0017 BOARD TERMINAL Fi 2110 0005 FUSE CARTRIDGE 115V OPERATION ONLY 2110 0005 FUSE CARTRIDGE 1 5A 230V OPERATION ONLY Jl 1250 0085 CONNECTOR BNC J2 1250 0085 CONNECTOR BNC KL 0490 0135 RELAY THERMAL SPOT K2 0490 0029 RELAY DPDT K3 0490 0010 RELAY SPDT 115AC K4 THRU NOT ASSIGNED 0490 0038 RELAY DPDT 5A RESISTIVE 1120 0131 METER 1MA 1251 0148 CONNECTOR POWER MALE 3 PIN 1850 0058 TRANSISTOR GERMANIUM PNP 2N201 1850 0021 TRANSISTOR GERMANIUM PNP 2N441 1850 0021 TRANSISTOR GERMANIUM PNP 2N441 NOT ASSIGNED 1854 0005 TRANSISTOR SILICON NPN See introduction to this section 6 3 Model 493A 495A Section VI Table 6 1 Table 6 1 Reference Designation Index Cont d Circuit ini t Note Reference 9 Stock No Description RL 0687 3331 R FXD COMP 33K OHM 10 1 2
48. Holmes Corp Microlab Inc Alden Products Co Allen Bradley Co Litton Industries tac TRW Semiconductors Inc Texas Instruments lac Transistor Products Div Dallas Texas The Alliance Mfg Co Alliance Ohio Pacific Relays Inc Van Nuys Calif Ametock Corp Rockford i Pulse Engineering Co Ferroxcube Corp of America Cole Rubber and Plastics inc Sunayvale Calif Amphenol Borg Electronics Corp Chicago Radio Corp of America Semiconductor and Matetials Div Somerville N J Vocaline Co of America Inc Old Saybrook Conn Hopkins Engineering Co Fernando Calif G E Semiconductor Prod Dept Syracuse N Y Apex Machine amp Tool Co Dayton Ohio Eldema Cotp Compton Calif Transitron Electric Corp Wakefield Mass Pyrofilm Resistor Co inc Cedar Knolis N J Singer Co Diehl Div Finderne Plant Sumerville N J Arrow Hart and Hegeman Elect Co Hartford Conn Lambertville N J Hi Q Division of Aerovox Myrtle Beach Precision Paper Tube Co Chicago itl Dymec Division of Hewlett Packard Co Palo Alto Calif Sylvania Electric Products Microwave Device Div Mountain View Calif Motorola Inc Semiconductor Prod Div Phoenix Arizona Santa Clara Calif Saugerties N Y Tautus Corp Filtron Co Inc Western Div Culver City Calif Automatic Electric Co Northlake III Sequoia Wire Co Redwood City Calif Precision Coil Spring Co El Monte Calif P
49. Hughes Aircraft Ca Newport Beach Calit Amperex Electronic Co Div of North American Phillips Co inc Hicksville N Y Bradley Semiconductor Corp Haven Conn Carling Electric Inc Hartford Conn George Garrett Co Div MSL Industries Inc Philadelphia Federal Screw Products Inc Chicago Hi Fischer Special Mtg Co Cincinnati Ohio General Industries Co The Elyria Ohio Goshen Stamping amp Tool Co Goshen Ind JFO Electronics Corp Brooklyn N Y jennings Radio Mfg Corp San Jose Calif Signalite Inc Neptune N J J H Winns and Sons Winchester Mass industrial Condenser Corp Chicago HI Products Division of Amphenol Borg Electronics Corp Danbury Conn E F Johnson Co Waseca Minn International Resistance Philadelphia Pa CTS Knights Inc Sandwich lil Kulka Electric Corporation Vernon N Y Lenz Electric Mfg Co Chicago HI Littlefuse Inc Des Plaines ill Lord Mfg Co Erie Pa C W Marwedel San Francisco Calif james Millen Co Inc Maiden Mass J W Millet Co Los Angeles Calif Cinch Monadaock Div of United Carr Fastener Corp San Leandro Calif Mueller Electric Co Cleveland Ohio National Union Newark N J Oak Manufacturing Crystal Lake lil Bendix Corp The Bendix Pacific Div N Hollywood Calif Pacific Metals Co San Francisco Calif Phanostran Jnstrument and Electronic Co South Pasadena Calif Philadelphia Steel and W
50. IN control sets the gain of the amplifier Maximum input vs output gain of the instrument is at least 30 db for outputs up to 1 watt With a signal applied at the microwave amplifier input the only way to insure zero output is to place the instru ment on STANDBY 3 5 CURRENT METER The current meter monitors cathode current Theinstrument has a gainof at least 30 db for outputs up to 1 watt when the GAIN control is adjusted to within the RATED POWER limits indi cated on the meter 3 6 RF INPUT AND OUTPUT rf signal up to 100 milliwatts in the 4 0 to 8 0gc range 7 0 to 12 4 gc for the Model 495A is applied tothe RF INPUT Input and output impedance is 50 ohms at rf frequencies infinity at dc SWR is less than 3 1 CAUTION DO NOT APPLY AN INPUT SIGNAL BEFORE APPLYING AN EXTERNAL LOAD AT THE RFOUTPUT THE TWT CAN BE DAMAGED 3 7 MODULATION INPUT The MOD INPUT accepts externally applied dc to 500 kc signals up to 10 volts in amplitude or dc to 100 kc signals up to 20 volts in amplitude Modulation signal amplitudes of 20 volts will produce a modulation on off ratio of at least 20 db Sincethe modulator is dc coupled an rf power leveler circuit can be applied between the RF POWER OUT PUT and MOD INPUT see paragraph 3 16 Under no circumstances should the modulation voltage be allowed to go positive unless GAIN is reduced accordingly In other words peak cathode current must not exceed RATED POWER level 3 8 OPERA
51. MP 100K OHM 10 1 2W R403 0687 5551 RiFXD COMP 33K OHM 10 1 2W R404 0727 0252 RiFXD DEPO 740K OHM 1 1 2W R405 2100 0094 R VAR COMP 50K OHM 30 LIN 1 5W R406 0727 0222 R iFXD DEPC 214K OHM 1 1 2W R407 0690 8231 R FXD COMP 82K OHM 10 1W R408 0690 4751 R FXD COMP 47K OHM 10 1W R409 0690 1041 R FXD COMP 100K OHM 10 1W R410 0765 0008 R FXO MET FLM 68K OHM 10 2W R411 2100 0094 R VAR COMP 50K OHM 30 LIN 1 5W R412 0765 0008 R FXD MET FLM 68K OHM 10 2W R413 0727 0283 R FXD DEPC 1 66 MEGOHM 1 1 2W R414 0758 0076 R FXD MET FLM 68K OHM 5 1 2W R415 0727 0165 R FXD DEPC 15 2K OHM 1 1 2W R416 0727 0230 R FXD DEPC 284K OHM 1 1 2W R417 0727 0255 RiFXD DEPC 360K OHM 1 1 2W R418 2100 0096 R VAR COMP 1 MEGOHM 30 LIN 1 5W R419 0727 0208 R FXD DEPC 100K OHM 1 1 2W R420 0727 0282 R FXD 1 5 MEGOHM 1 1 2W R421 0727 0286 R FXD DEPC 1 88 MEGOHM 1 1 2W R422 0727 0276 R FXD DEPC 1 MEGOHM 1 1 2W R423 0727 0245 R FXD DEPC 500K OHM 1 1 2W R424 0727 0276 R FXD DEPC 1 MEGOHM 1 1 2W R425 0689 2055 R FXD COMP 20K OHM 5 LW R426 0767 0010 R FXD MET FLM 15K OHM 5 3w R427 0695 5651 R FXD COMP 56K OHM 10 2 R428 0775 0010 R FXD MET FLM 85K OHM 5 Sw R429 0727 0552 R FXD DEPC 150K OHM 1 1 2W R430 0727 0221 R FXD DEPC 200K OHM 1 1 2W See introduction to this section 01280 3 6 5 Section VI Model 493A 495A Table 6 1 Table 6 1 Reference Designation Index Cont d Circuit dp Stock Description Note Reference
52. NE MOD INPUT OFF STANDBY ON 9 19 CAUTION NEVER APPLY POWER TO THE MODEL 4934 495 INPUT UNLESS ITS OUTPUT IS TERMINATED INTO 50 OHM LOAD THE TWT CAN BE DAMAGED Set LINE switch to ON The STANDBY lamp glows Approximately 90 seconds later the ON lamp will glow and the instrument is ready for normal operation If the Model 4934 4954 is placed in the STANDBY position the STANDBY lamp will glow Approximately 90 seconds later high voltage will be applied to the instrument only when the primary power switch is set from STANDBY to ON The purpose oftheSTANDBY position is to instantly turn rf power output or after initial turn on without waiting for the initial 90 second time delay Note The instrument should be turned to ON and allowed to warm up for 30 minutes before proceeding to step 2 Rotate GAIN control clockwise to within RATED POWER indicated on meter full clockwise With the CURRENT meter pointer set within normal meter limits a maximum of 1 mw at the input produces a minimum of 1 watt at the output across the frequency range Small signal gain is at least 30 db A constant 1 mw signal at the input of the Model 4934 4954 across the band produces an amplified power output vari ation across the band of 6 db or less Note If excessive helix current is drawn by the twt the overload relay K3 will ener gize removing high voltage from the cir cuit
53. OOD CONNECTION BETWEEN THE EYELETS AND CONDUCTOR APPLY SOLDER FROM BOTH SIDES OF THE BOARD 5 19 PLATED THROUGH BOARD The plated through etched circuit board consists of a base board and con ductor The board does not include funneled eyelets The conductor material is plated to the walls of the hole and effectively the conductor is extended into the hole THIS TYPE OF BOARD CAN BE SOLDERED FROM EITHER THE CONDUCTOR OR COMPONENT SIDE WITH EQUALLY GOOD RESULTS 5 20 TWT REMOVAL a Remove ac power cable from instrument b Remove instrument s top and bottom covers see paragraph 5 8 Panel Removal c Remove fan air duct d Disconnect twt leads from terminal board El e Return cables and type N Panel Connectors with tube If input and output cables are detachable dis connect them at the tube without disassembling type N panel connectors If the cables are not detachable disassemble type N connectors remove from panel re assemble them and return them wich the tube 1 Remove modulator plug in A400 g Remove El mounting screw nearest ground ter minal E1A Figure 5 3 and swing El assembly aside h Place instrument on its side and remove four screws holding twt to main deck see Figure 5 4 i Remove twt and refer totwt warranty claim sheet for packing instructions Note Fill out warranty claim completely andinclude reason for returning twt e g low power no power etc 5 3
54. T SIDE COVERS 5 6 COVER REMOVAL 5 7 P modular instrument enclosures have re movable top bottom and side covers for easy access to the instrument interior see Figure 5 1 Instruc tions for cover removal and replacement are given below 5 8 TOP AND BOTTOM COVERS a Remove four flat head screws from covers b Slide cover back and off instrument c To replace cover reverse procedure 5 9 SIDE COVERS a Remove four round head screws holding each side cover b Remove side cover c Reverse procedure to replace the side cover sections lt TOP COVER BOTTOM COVER 493 495 8 1 Figure 5 1 Cover Removal 01280 2 Section V Table 5 1 Table 5 1 Test Equipment Model 493 495 equired Instrument Type Critical Specifications Use Instrument Recommended VOM Range 5 to 3000 volts Accuracy 3 Impedance 10 megohms floating input Check DC Voltages Triplett Model 620A AC Voltmeter DC Clip On Range 5 to 25 millivolts Accuracy 2 Frequency Range 10 to 1000 cps Impedance 10 megohms Range 3 ma to 10 ma Check AC Ripple Model 400D AC VT VM A 0 02 ufd Capacitor 5000 volt rating nected in series with AC VTVM Check 0 Model 428A Milli Milliammeter Helix Current ammeter Accuracy 3 Figure 5 5 Signal Generato
55. THER WHEN THE INSTRUMENT IS IN OPERATION b Replace the 3 ampere standard fuse with a 1 1 2 ampere standard fuse 2 2 Model 493 495 2 11 REPACKAGING FOR SHIPMENT 2 12 The following list is a general guide for packaging an instrument for shipment However if you have any questions contact your Hewlett Packard Engineering Representative If possible use the original container designed for the instrument b Wrap the instrument in heavy paper or plastic before placing it in the shipping container Use plenty of packing material around all sides of the instrument and protect panel faces with card board strips d Use a heavy cardboard carton or wooden box tc house the instrument and use heavy tape or metal bands to seal the container Mark the packing box with Fragile Delicate Instrument etc 01280 3 Model 493 495 Section Paragraphs 3 1 to 3 16 SECTION HH OPERATION 3 1 INTRODUCTION 3 2 The Model 493A Microwave Amplifier has only one control the GAIN control thus it is easy to ate The GAIN controland input and output connectors are explained under paragraph 3 3 CAUTION The instrument should not be allowed to re main in operation for long periods of time without fan duct and panels Ambient tem perature within instrument will increase causing excessive helix current to flow 3 3 FRONT PANEL CONTROLS 3 4 GAIN CONTROL The GA
56. TING INSTRUCTIONS 3 9 Turn on and amplitude modulation procedures are given in figures 3 1 and 3 2 01280 5 3 10 MICROWAVE AMPLIFIER APPLICATIONS 3 11 The Model 493A is used for broadband or narrow band power amplification and amplitude mod ulation An external rf leveler circuit can be em ployed where relatively constant output power is required 3 12 BROADBAND AMPLIFICATION The Model 493A will faithfully amplify many broadband signals Such as those employed in radar television relays and microwave carrier systems In additionto this broad band feature it has a linear amplification character istic over the frequency range 3 18 Of the many broadband applications of the Model 493A some of the most useful are 1 investigation of information handling capacity in broadband microwave communieations systems 2 amplification of low frequency harmonics to produce frequency markers used in microwave frequency measurements 3 14 NARROWBAND AMPLIFICATION The Models 493A and 495A can be used for narrowband amplifi cation at any one point acrossthe 4 0 to 12 4gc range Noise can be greatly reduced by employing a narrow bandpass filter in conjunction with the Models 493A and 495A Microwave Amplifiers 3 15 POWER AMPLIFICATION The Model 493A can be used as a moderate power broadband signal source by amplifying the low power output of klystron signal generators in the 4 0 to 12 4gc range Thus a micro wave source ampli
57. TWT Lead Identification 1 Board TWT Element Terminal Color Lead ae es Refer to tube data Anode EIF sheet for proper Cathode EIE identification of leads Grid E1D Heater Cathode Heater ElB Ground ElA 5 22 TWT VOLTAGE ADJUSTMENTS 5 23 Usethis procedure when resetting TWT voltages or after installing a TWT Note that adjustment ofthe collector helix voltage affects anode voltage When collector helix adjustments are made the anode volt age adjustment must also be made if applicable 01280 5 Section V Paragraphs 5 21 to 5 27 CAUTION The instrument should not be operated for long periods of time without fan duct and covers Ambient temperature within the instrument will in crease causing excessive helix current to flow This will result in low power amplification and or damage to TWT 5 24 FILAMENT ADJUSTMENT a Remove the instrument top cover see para 5 8 b Rotate filament adjust R306 figure 5 3 full counterclockwise Connect de voltmeter between E1B and see figure 5 3 DC voltmeter to 10 volt range d Set Model 493A power switch to STANDBY e Adjust filament adjust R306 for 6 2 vdc f Vary power line voltage from 103 to 127 vac The dc voltmeter reading should not vary more than 6 2 0 1 volt Note The filament voltage is factory adjusted to 6 2 volts dc This will extend the filament life of the TWT considerably 5 25 COLLECTOR HELIX ADJ
58. Telex 85 86 533 Hewlett Packard Vertriebs GmbH Kurhessenstrasse 95 6 Frankfurt 50 Tel 52 00 36 Cable HEWPACKSA Frankfurt AFRICA ASIA AUSTRALIA ANGOLA Telectra Box 6487 Luanda Cable TELECTRA Luanda AUSTRALIA Hewlett Packard Australia Pty Ltd 22 26 Weir Street Glen iris 3146 Victoria Tel 20 1371 4 lines Cable HEWPARD Melbourne Teiex 31024 Hewlett Packard Australia Pty Ltd 61 Alexander Street Crows Nest 2065 New Soath Wales Tel 43 7866 Cable HEWPARD Sydney Hewlett Packard Australia Pty Ltd 97 Churchili Road Prospect 5082 South Australia Tol 65 2366 Cable HEWPARO Adelaide CEYLON United Electricals Ltd P O Box 681 Yahata Building Staples Street Colombo 2 5496 Cable HOTPOINT Colombo CYPRUS Kypronics 19 190 Hommer Avenue P 0 Box 752 Nicosia Tei 6282 75628 Cable 1 ETHIOPIA African Salespower amp Agency Private Ltd Co P 0 Box 718 58 59 Cunningham St Addis Ababa Tel 12285 Cable ASACO Addisababa HONG KONG Schmidt amp Co Hong Kong Ltd 0 Box 297 Prince s Building 10 Chater Road Hong Kong Tel 240168 232735 Cable SCHMIDTCO Hong Kong INDIA The Scientific Instrument Co Ld 6 Te Bahadur Sapru Road Allahabad 1 Tel 2451 Cable SICO Ailahbad The Scientific Instrument Co Ld 240 Dr Dadabhai Naoroji Road Bombay 1 Tel 26 2642 Cable SICO Bomb
59. USTMENT a Parallel ac and dc voltmeter connect between helix terminal E1G and ground figure 5 3 CAUTION AC and dc voltmeter should be isolated to withstand 3000 volts b Set Model 493A power switch to ON c With the high voltage adj R57 figure 5 3 set the collector helix voltage tothe value stamped on the TWT capsule WARNING High voltage is present onthe high voltage board Al and the terminal board El d Vary power line voltage from 103 to 127 vac collector helix voltage should not vary more than 5 volts ripple voltage should not exceed 10 millivolts 5 26 ANODE ADJUSTMENTS If Applicable a Parallel and ac anddc voltmeter connect between anode terminal E1F and ground figure 5 3 b With the cathode current adjust R53 figure 5 3 Set anode voltage to value listed in TWT data sheet Note If theanode voltage range is not great enough to obtain anode voltage needed R54 and R55 see figure 5 12 can be interchanged to provide proper voltage range This is assuming col lector helix voltage is settothe proper value Vary power line voltage from 103 to 127 vac Anode voltage should not vary more than 10 volts ripple should not exceed 25 millivolts measured on the TWT side of R203 5 27 350 VOLT ADJUSTMENT a Parallel an ac and de voltmeter connect between junction of C401 and R431 see figures 5 13 and 5 14 and ground 5 5 Section V Model 493A 495A Figure 5 3
60. WT and MEC TWT Page 5 16 5 17 Figures 5 13 and 5 14 Change note for CR405 to read install for tubes having negative grid voltage Page 6 6 Table 6 1 Change V403 and V404 to Electron Tube Triode Pentode 6U8 HP Part No 1943 0014 Page 6 7 Table 6 1 Change Frame in MISCELLANEOUS to HP Part No 5060 0732 Add Conditions of Warranty page attached B Page 1 0 Table 1 1 Accessories Furnished Delete all references to Rack Accessories Available Add Rack Mounting Kit is available to install the instrument in a 19 inch rack Rack Mounting Kits may be obtain ed through your nearest Hewlett Packard Office by ordering HP Part Number 5060 8740 CHANGE 1 Mounting Kit Page 6 5 Table 6 1 Change R417 to HP Part No 0727 0236 Page 6 6 Table 6 1 Change T2 to HP Part No 9100 0299 CHANGE 2 Page 6 6 Table 6 1 Delete the existing refer ence to V7 and replace with the following V7 1952 0017 Electron Tube TWT 4 8 GHz MEC 493A only V7 1952 0022 Electron Tube TWT 4 8 GHz MA 493A only V7 1952 0019 Electron Tube TWT 7 12 4 GHz MEC 495A only V7 1952 0023 Electron Tube TWT 7 12 4 GHz MA 495A only Page 6 10 Table 6 2 Delete entries for 1952 0010 1952 0016 1952 0017 and 1952 0019 and replace with the following 1952 0017 Electron Tube 4 8 GHz 493A only 11312 MEC 4278 1952 0019 Electron Tube TWT 7 12 4 GHz 495A only 11312 MEC M4273C 12 16 75 Manual Changes Model 493A
61. a condition such that the voltage applied to the grid of the TWT is negative This action takes place whenever the voltage on the base of Q401 a npn tran sistor drops This drop in voltage causes Q401 to cut off When Q401 is cut off the only voltage applied to CR403 isthe voltage developed through R414 R415 and R431 This positive voltage is applied through CR403 since CR403 will now be forward biased to the grid of V403B When the instrument is switched from STANDBY to ON the positive voltage from the 300 volt supply is applied tothe base of Q401 through R416 and R417 This positive voltage turns 0401 on caus ing current to flow from the 350 volt supply through R417 0401 andR415 CR403 This negative voltage will back bias CR403 causing it to open and disconnect the hold off circuitry The instrument is now back to its normal operating condition 4 22 350 VOLT REGULATED POWER SUPPLY The regulated power supply is a conventional series regulated power supply that provides 350 volts for the amplifier circuit The circuit includes the series regulator V401A control tube V401B and reference tube V402 The 350 Adj control R405 is used to set the regulated voltage output of the supply 4 3 Section IV Model 493A 495A Figures 4 3 and 4 4 Al HIGH VOLTAGE BOARD HALF WAVE COLLECTOR RECTIFIER CRE HIGH VOLTAGE SERIES RECTIFIER AND DOUBLER mood CRT 20 C
62. abinet instrument A kit is included with the instrument for conversion from cabinet to rack mount configuration see paragraph 2 7 Con version to Rack Mount Note The instrument fan is located on the rear panel Make provisions to insure that the instrument obtains sufficient air The am bient temperature within rhe instrument should not be greater than 35 C 2 7 CONVERSION TO RACK MOUNT 2 8 To convert the Model 493A to a rack mounted instrument proceed as follows see Figure 2 1 a Remove adhesive backed trim strip from sides of instrument b Remove tilt stand by pressing the two sides of the stand toward center of instrument c Remove plastic feet by pressing button in center of each foot and sliding the foot toward center of instrument d Attach filler strip to bottom of instrument E RACK MOUNTING FLANGE Y e Ela TRIM STRIP e s BOTTOM COVER L0 M 448 Figure 2 1 Cabinet to Rack Mount Conversion 01280 1 Section II Paragraphs 2 9 to 2 12 e Add filler strip to bottom of instrument 2 9 POWER REQUIREMENTS 2 10 The Model 493A is usually shipped connected for 115 volt 50 to 60 cps operation To convert tc 230 volt 50 to 60 cps operation a Move slide switch in the rear of the instrument to the 230 volt position when properly positioned Switch will read 230 volts See figure 2 2 CAUTION NEVER SWITCH THE 115 230 VOL T SWITCH 52 FROM ONE POSITION TO THE O
63. ad band of frequencies The GAIN control is the only variable front panel control lt controls rf signal amplification and average rf power output 1 7 The Models 493A and 495A traveling waveampli fier tubes twt s utilize periodic permanent magnet focusing thus they are lightweight compact and consume less power than solenoid focused twt s 1 8 An instrument in one frequency range can be converted to an instrument in another frequency range since both the Models 493A and 495A are identical except for traveling wave amplifier tube 1 9 Since the Models 493A and 495A are identical except for the twt the manual will be discussed in terms of the Model 4934 The Model 495A will be mentioned only when its operation differs from that of the Model 493A 1 10 The Model 493A uses a modular design which includes a kit thatallows conversion to eithera cabinet or rack mount configuration 1 11 INSTRUMENT OPTION 1 12 The option 01 Model 493A microwave amplifier RF INPUT and OUTPUT connectors are locatedonthe rear panel In all other respects the option01micro wave amplifier is the same as a regular microwave amplifier 01280 3 1 13 INSTRUMENT IDENTIFICATION 1 14 Hewlett Packard uses a two section eight digit serial number 000 00000 If the first three digits of the serial number on your instrument do not agree with those on the title page of this manual change Sheets supplied with the manual will define differences betw
64. am of Regulated High Voltage Power Supply is shown in figure 4 3 The regulated high voltage power supply is a series regulated power supply that includes series regulator V1 V2 reference tubes V3 V4 and differential amplifier V5 4 11 The series regulator V1 V2 is connected in series with the main load A regulated output voltage is obtained by varying the internal resistance of the series regulator to compensate for variations in load current and source voltage 4 12 Initially the voltage at the grid of 5 sets the conduction of the series regulator which in turn sets the output voltagelevel When the output voltage varies from the level set by the high voltage level adjust R57 these variations are sensed at the grid of V5A B The resultant signal is amplified and sent to the series regulator The series regulator resistance varies to maintain the output voltage constant 4 13 C12 and C13 see figure 5 12 are part of the bypass and filter circuits at theoutput of the regulator tubes V3 V4 C15 couples ac ripple directly to the grid of V5 thus decreasing ripple voltage by lowering dynamic impedance 4 14 A voltage doubler which includes CR7 through CR20 and 11 produces approximately 2 9 to 3 4 kv at normal line voltage The actual high voltage output is dependent on how the transformer has been connected see table figure 5 12 4 15 CATHODE CURRENT ADJ The cathode current adj R53 is connected in a r
65. are wave output Rise time should be less than 0 8 psec overshoot less than 5 e Set square wave generator frequency to 1 kc in crease signalamplitude to produce a 100 volt peak to peak signal at the grid of the twt Rise time should be less than 10 usec overshoot less than 5 5 33 BANDWIDTH a Connect the Model 493A as shown in figure 5 7 b Set the sine wave oscillator at 1 kcand adjust its output amplitude for a 10 volt peak to peak sine wave output at the grid of the twt c Increase the frequency of the sine wave oscil lator until the amplitude of the sine wave voltage on the grid of the twt decreases to 7 volts peak to peak Bandwidth specifications 3 db variation from dc to 500 ke 5 34 PERFORMANCE CHECK 5 35 This performance check is an in cabinet check that is used to check instrument specifications All checks are made from the front panel This procedure can also be used as an incoming or outgoing quality control check SIGNAL GENERATOR hp 626A 1 12 44 009 N y O output hp 6188 4 7gc hp 620A SQUARE WAVE 7 igc GENERATOR hp MA hp M500A CABLE Ap iOOlIA CABLE Section V Paragraphs 5 31 to 5 37 5 36 POWER AMPLIFICATION CHECK a Refer to turn on procedure figure 3 1 and setup the Model 493A set primary power switch to ON and allow the Model 493A to warm up for approximately 30 minutes b Connect the Model 493A as shown in figure 5 5 Mi
66. arranty Claim form which is included with the Operating and Service Manual for your instrument This form is also included with replacement Microwave tubes supplied by Hewlett Packard Additional copies may be obtained from your local Hewlett Packard Sales and Service Office Please ref HP Stock No 9320 1865 Hewlett Packard specified replacement tubes can be obtained from your local Hewlett Packard Sales and Service Office Rev 11 26 75
67. ay The Scientific Instrument Co Ld 11 Esplanade East Calcutta 1 Tel 23 4129 Cable SICO Calcutta The Scientific Instrument Co Ld 30 Mount Road Madras 2 Tel 86339 Cable SICO Madras The Scientific Instrument Co Ld 8 7 Ajmeri Gate Extn New Delhi 1 Tel 27 1053 Cable SICO New Delhi Hewlett Packard Vertriobs GmbH Hewlett Packard Italiana S p A SPAIN HEWPAK A G Beim Strohhause 26 Palazzo Italia Ataio Ingenieros 54 Route des Acacias 2 Hamburg 1 Piazza Marconi 25 Urgel 259 1211 Geneva 24 Tel 24 05 51 52 00144 Rome Eur Barcelona 11 Tel 43 79 29 Cable HEWPACKSA Hamburg Teh 591 2544 Tel 230 69 88 Telex 2 24 86 Teter 21 53 32 Cable Rome Atalo Ingenieros Hewlett Packard Vertriebs Gmon Telex 01514 Enrique Larreta 12 enhn Bureau i Madrid 16 t Reginfriedstrasse 13 NETHERLANDS Madrid as PO Box 375 Galata S Men 3 Hewlett Packard Benelux NV 14235 7 Istanbul Tel 69 51 21 22 Packard Pepel TELEATAIO Madrid iod Cables HEWPACKES Murich Amsterdam 2 2 207240 Cable TELEMATION Istanbul Tet 42 77 77 WEDEN GREECE Gable PALOBEN Amsterdam hh EDEN int AB UNITED KINGDOM gt Telex 13 216 Hewlett Packard Ltd Kostos Karayannis Hagakersgatan 7 224 Bath Road 18 Ermou Street NORWAY eres VONT Slough Bucks Mint 126 Hewlett Packard Norge A S Tel Slough 33341 Tel 230 301 Nesvelen 13 HP Instrument Cable HEWPIE Slough Cable
68. ay in Figure 3 1 4 5 5 2 5 10 and 5 11 and in paragraphs 4 24 and 4 25 Tables 6 1 and 6 2 K1 Change Stock Number to 0490 0037 and Mfr Part No to 6N0180T R414 Change to R fxd mtl fim 100K ohms 5 1 2W Stock No 0758 0053 Mfr 07115 Mir Part No C20 TQ 1 Delete 4 Stock No 0758 0076 CHANGE 2 Figure 5 12 C15 Change value to 0 015 uf R51 Change value to 1 M Tables 6 1 and 6 2 Change to 15 0160 0062 C fxd paper 0 015 pf 10 3000 vdew 56989 184P153 1 R51 0687 1051 R fxd comp 1 M 1095 1 2W 01121 EB1051 1 Delete 0160 0384 and 0687 2151 CHANGE 3 Figure 5 13 Modulator Board A101 Change as illustrated Figure 5 14 Modulator Change as illustrated Table 6 1 Delete all items with 400 series designations Insert A101 495A 65C Assembly Mod Board C103 C104 0150 0052 fxd cer dual 0 05 uf 20 400 vdew C105 0150 0012 fxd cer 0 01 uf 2005 1000 vdew C106 0140 0216 fxd mica 120 pf 205 300 vdew C107 0140 0146 C fxd mica 82 pf 5 300 C108 0130 0013 C var cer 2 12 pf C110 0150 0015 C fxd TiO 2 2 pf 10 500 111 0130 0017 var cer 8 50 uf 500 C112 0140 0225 C fxd mica 300 pf 1 300 CR103 1901 0030 Diode Si 800 PIV CR104 CR105 1901 0025 Diode Si CR106 1902 0163 Diode CR107 CR108 1901 0030 Diode Si 800 PIV 0101 1854 0003 Transistor Si NPN R104 0693 4741 R fxd comp 470K ohms 410 2W R105 R106 06
69. c Semicoaductor Div Woburn Mass 93369 Robbins and Myers Inc New York N Y 33410 Stevens Mig Co lac Mansfield Ohio 93929 G V Controls Livingston N J 90015 42 Revised July 1966 01280 5 Code No 94137 94144 94148 94154 94197 94222 94310 94330 94682 94696 95023 95236 95238 95263 95264 95265 95275 95348 95354 95712 95984 95987 96067 96095 96256 96296 95330 35341 96501 97464 97539 97979 97983 98141 98159 98220 98278 98291 Manufacturer Address General Cable Corp Raytheon Co Comp Div Ind Comp Operations Quincy Mass Scientific Electronics Products Inc Loveland Colo Newark N J Bayonne N J Tung Sol Electric Inc Curtiss Wright Corp Electronics Div East Paterson N J South Chester Corp Chester Pa Tru Ohm Products Memcor Components Div Huntington tnd Wire Cloth Products Inc Bellwood Itl Worcester Pressed Aluminum Corp Worcester Mass Magnecraft Electric Co Chicago HI George A Philbrick Researchers Inc Boston Mass Miami Fla Woodside N Y Long Island N Y Burbank Calif Sheridan Wyo Bridgeport Conn Allies Products Corp Continental Connector Corp Leecraft Mfg Co Inc Letco Electronics Inc National Coil Co Vitramon Inc Gordos Corp Bloomfield j Methode Mfg Co Chicago Dage Electric Co Inc Franklin ind Siemon Mfg Co Wayne 111 Weckesser Co Chicago Huggins Laborato
70. c Power supply output voltage to the Model 493A MOD INPUT ZERO volts record power meter reading d Turn on power supply Adjust for negative out put Increase power supply output until power meter reading is 20 db less than that recorded in step c Power supply voltage should be between 0 and 20 volts 5 39 RESIDUAL AM CHECK Connect the Model 493A as shown in figure 5 9 Note Make sure the residual AM of the signal generator used to test the Model 493A is at least 45 db below signal level b Set up the square wave generator for 1 kc c Signal generator output frequency 8 gc 12 4 gc for the Model 495A Set generator MOD SELECTOR for EXT modulation d AdjustINPUT power to Model 493A for 100 milli volts 18 db reading at the ac vtvm e Set Signal Generator for CW output and record ac VIVM reading which should be less than 55 db 01280 4 Note Readings taken on an average reading volt meter such as Model 400D require a 8 db correction actor to obtainthe actual value of the residual AM This 8 dbfactor accounts for a the crystal square law characteristic and b the difference between average and peak values of square and sine waves Thus a 55db vtvm reading includes the follow ing 10 db 18 from step d plus 8 as ex plained above produced by ac vivm and crystal detector and 45 db caused by resid ual AM 5 40 MODULATOR FREQUENCY RESPONSE a Connect the Model 493A a
71. cisco de Miranda Apartado del Este 10934 Chacaito Caracas Tel 71 88 05 71 88 69 71 88 76 Cable HEWPAK Caracas FOR AREAS NOT LISTED CONTACT Hewlett Packard Inter Americas 3200 Hitiview Ave Palo Alta California 94304 Tel 415 326 7000 TWX 910 373 1267 Cable HEWPACK Palo Atto Telex 034 8461 668 EUROPE AUSTRIA Unilabor GmbH Wissenschaftliche Instrumente Rummelhardtgasse 6 3 P O 33 Vienna 1X 71 Tel 42 61 81 Cable LABORINSTRUMENT Vienna BELGIUM Hewlett Packard Benelux S A 348 Boulevard du Souverain Brussels 16 Tel 72 22 40 Cable PALOBEN Brussels Telex 23 494 DENMARK Hewlett Packard A S Egerang Longebjerg 6 2850 Naerum Tel 01 80 40 40 Cable HEWPACK AS Telex 66 40 FINLAND Hewlett Packard Oy Gyldenintie 3 Helsinki 20 Tel 67 35 38 Cable HEWPACKOY Helsinki Telex 12 1563 HEWLETT PACKARD SALES AND SERVICE FRANCE Hewlett Packard France 150 Boulevard Massena 75 Paris 13e Tel 707 97 19 Cable HEWPACK Paris Telex 25048 Hewlett Packard France 4 Qua des Etroits 69 Lyon 5e Tel 22 63 45 GERMANY Hewlett Packard Vertriebs GmbH Lietzenburger Strasse 30 1 Berlin W 30 Tel 24 86 36 Telex 18 34 05 Hewlett Packard Vertriebs GmbH Herrenberger Strasse 110 703 B blingen W rttemberg Tel 07031 6671 Cable HEPAG B btingen Telex 72 65 739 Hewlett Packard Vertriebs GmbH Achenbachstrasse 15 4 D sseldorf 1 Tel 68 52 58 59
72. co Wilmington Del Milwaukee Wis z de Nela Park Cleveland Ohio General Radio Co West Concord Mass Gries Reproducer Corp New Rochelle N Y Grobet File Co of America lac Carlstadt Lancaster Pa Palo Alto Calif Owensboro Ky Chicago 11 Hamilton Watch Co Hewlett Packard Co 6 Receiving Tube Dept Lectrohm Inc Stanwyck Coil Products Ltd Hawkesbury Ontario Canada Mallory amp Co Inc Indianapolis Ind Mechanical Industries Prod Co Akron Ohio Miniature Precision Bearings Inc Keene Muter Co d Chicago MI C A Norgren Co Englewood Colo From FSC Handbook Supplements 84 1 Dated JULY 1965 H4 2 Dated NOV 1962 6 11 E CODE LIST OF MANUFACTURERS Continued Section VI Table 6 3 Code No Monufacturer Address 44655 Ohmite Mfg Co Skokie Hl 46384 Penn Eng amp Mfg Corp Doylestown Pa 47904 Polaroid Corp Cambridge Mass 48620 Precision Thermometer amp Inst Co Southampton Pa 49956 Microwave amp Power Tube Div Waltham Mass 52090 Rowan Controller Co Westminster Md 52983 Sanborn Company Waltham Mass 54294 Shallcross Mfg Co Selma N C 55026 Simpson Electric Co Chicago HI 55933 Sonotone Corp Elmstord 55938 Raytheon Co Commercial Apparatus amp Systems Div So Norwalk Conn 56137 Spaulding Fibre Co Inc Tonawanda N Y 56289 Sprague Electric Co North Adams Mass 59446 Telex jac St Paul Mian 59730 Thomas
73. der of their stock numbers and provides the following information on each part a Description of the part see list of abbreviations below b Typical manufacturer of the part in a five digit code see list of manufacturers in Appendix I c Manufacturer s stock number d Total quantity used in the instrument TQ col 6 3 Miscellaneous parts not indexed in Table 6 1 are listed at the end of the table 6 4 ORDERING INFORMATION 6 5 To order a replacement part address order or inquiry to your nearest Hewlett Packard field office see maps at the rear of this manual 6 6 Specify the following information for each part a Modeland complete serial number of instrument b Hewlett Packard stock number Circuit reference designator d Description 6 7 order a part not listed in tables 6 1and 6 2 give a complete description of the part and include its function and location A assembly F fuse plug Vv vacuum tube neon B motor FL filter Q transistor bulb photocell etc capacitor 2 jack R resistor W cable CR diode K relay RT thermistor X socket DL delay line L inductor 8 switch Y crystal ns device signaling lamp M meter transformer z network E misc electronic part MP mechanical part ABBREVIATIONS A amperes ELECT electrolytic MOM momentary RH round head A F C automatic frequency control ENCAP encapsulated MTG mounting RMO rack mount
74. dulator power supply Cathode current is monitored by the current monitoring meter M201 4 6 TRAVELING WAVE AMPLIFIER TUBE 4 7 The traveling wave amplifier tube used in the Model 4934 4954 includes an electron gun which pro jects a focused beam through a helically wound coil to a collector electrode shown in figure 4 2 The focused electrons are held in a pin like beam through the helix by the periodic permanent magnet focusing which produces a powerful magnetic field along the full length of the tube 4 8 The rf signal coupled into the gun end of the helix travels around the turns of the helix and thus has its linear velocity reduced by an amount equal to the ratio of the length of wireinthe helix to the length of the helix itself The electron beam velocity deter mined by the potential difference between the cathode and the helix is adjusted so that the electron beam travels a little faster than the rf signal The electric field of the rf signal on the helix interacts with the COLLECTOR OUTPUT HIGH VOLTAGE POWER SUPPLY J2 VI V4 300 VOLT REGULATOR V5 V6 300 VOLTS REG 350 VOLT POWER SUPPLY REG V40l V402 350 VOLTS REG MODULATOR V403 V404 CATHODE CURRENT METER CATHODE M201 R204 R205 METER SENSITIVITY s0 usare Figure 4 1 Model 4934 4954 Block Diagram 01280 2 4 1 Section IV Figure 4 2
75. e Inc So Pasadena Calif Williams Mfg Co San Jose Calif Webster Electronics Co New York N Y Adjustable Bushing Co N Hollywood Calif Micron Electronics Garden City Long Island N Y Amptobe Inst Corp Lynbrook N Y Twentieth Century Coil Spring Co Santa Clara Calif Amelco Inc ML View Calif Daven Div Thomas A Edison Ind McGtaw Edison Co Long Island Cily N Y Spruce Pine Mica Co Spruce Pine N C Newport Beach Calif Scottsdale Arizona Sem Tech Omni Spectra inc Detroit UL Computer Diode Corp Lodi N J ideal Prec Meter Co inc De jur Meter Div Brooklyn N Y Deico Radio Div of G M Corp Kokomo Inc Thermonetics Inc Tranex Company Hamlin Metal Products Corp Angstrohm Prec inc Power Design Pacific inc Ty Car Mfg Co Inc TRW Elect Comp Div Curtis lastrument inc E L DuPont and Co Inc Durant Mfg Co Bendix Corp The Eciipse Poineer Div Teterboro Thomas A Edison industries Div of McGraw Edison Co West Orange NJ LRC Electronics Horseheads N Y Electra Mfg Co Independence Kansas General Atronics Corp Philadelphia Pa Executone Inc Long Island Cily N Y Falnir Bearing Co The New Britain Conn Fanstee Metallurgical Corp N Chicago tll British Radio Electronics 40 Washington D C G E Lamp Division Canoga Park Calif Mountain View Calif Akron Ohio No Hollywood Calif Palo Alto Calif Holliston Mass Des Plaines HI Mt Kis
76. e causes a proportional change in anode voltage Fol lowing repair or adjustment of collector helix voltage adjust anode voltage and check for proper grid voltage 5 14 REPAIR 5 15 The Model 493A uses etched circuit boards A special procedure is required to repair or replace components on the boards The procedure for repair ing the circuit boards is given below 01280 5 Section V Paragraphs 5 10 to 5 20 5 16 uses three types of etched circuit boards the single sided double sided and plated through circuit board Soldering techniques vary for each Regard less of which board is used these general rules should be followed a Take care not to apply excessive heat tothe con ductor or component being soldered b Use a toothpick to clean holes before inserting new component To remove damaged component clip component leads near component Then apply heat and remove each component lead with a straight upward motion d After replacing a component the printed circuit board should be sprayed with a clear plastic such as Krylon 5 17 SINGLE SIDED BOARD The single sided etched circuit board consists of a base board funneled eyelets and conductor TO INSURE GOOD CONNECTION BETWEEN THE EYELET AND CONDUCTOR SOLDER FROM CONDUCTOR SIDE 5 18 DOUBLE SIDED BOARD The double sided etched circuit board consists of a base board funneled eyelets and conductors located on both sides of the board TO INSURE G
77. een your instrument and the Model 493A described in this manual 1 15 COOLING SYSTEM 1 16 The Model 493A uses the forced air method for obtaining the desired temperature within the instru ment Incoming air is filtered through a specially treated filter at the rear of the instrument The air filter should be checked periodically and if dirty cleaned A dirty air filter will affect instrument performance as well as component life Refer to para graph 5 1 for air filter maintenance 1 17 THREE CONDUCTOR POWER CABLE 1 18 To protect operating personnel the National Electrical Manufacturers Association NEMA recom mends that the instrument panel and cabinet be grounded Hewlett Packard instruments are equipped with a three conductor power cable which when plugged into an appropriate receptacle grounds the instrument The offset pin on the power cable s three prong connector is the green grounding wire 1 19 To preserve the protection feature when ting the instrument from a two contact outlet use a three prong to two prong adapter and connect the green pigtail on the adapter to ground 1 20 INCREASING TUBE LIFE 1 21 The cathode of the traveling wave amplifier tube has a shorter cathode life than those used in conventional types of tubes In addition the traveling wave amplifier tubeis expensive TURN THE INSTRU MENT OFF WHEN NOT IN USE 1 22 TRAVELING WAVE AMPLIFIER TUBE TWT 1 23 t
78. epackaging for Shipment 2 2 5 29 Optimizing TWT Element Voltages toObtain Proper Power Ampl 5 8 HI 3 1 5 31 Modulator Adjustment 5 9 3 1 Introduction s e se ees srra 3 1 5 32 Frequency Response 9 8 3 3 Front Panel Controls 3 1 5 33 Bandwidth 5 9 3 8 Operating Instructions a a ee 3 1 5 34 Performance Check 5 9 3 10 Microwave Amplifier Applications 3 1 5 36 Power Amplification Check 5 9 5 37 Gain Control Power On Off Ratio 5 9 IV CIRCUIT DESCRIPTION 4 1 5 38 Modulator On Off Ratio 5 1 4 1 0 25 5244 4 1 5 39 Residual Check 5 11 4 3 Overall Description 4 1 5 40 Modulator Frequency Response 5 11 4 6 Traveling Wave Amplifier Tube 4 1 5 41 SWR Check 25 5 12 4 9 Regulated High Voltage Power Supply 4 3 5 44 Frequency Range Conversion 5 12 4 16 300 Volt Regulation Circuit 4 3 4 18 Modulator ee see 4 5 VI REPLACEABLE PARTS 6 1 4 23 Relay Sequence e e e 4 6 6 1 Introduction 6 1 4 27 Regulated Filament Supply 4 6 6 4 Ordering Information 6 1 LIST OF ILLUSTRATIONS Number i Page Number Title Page 1 1 Model 495A Microwave Amplifier 1 0 5 1 Panel Removal 4720 47 2 5 1 1 2 TWT Warranty Claim Sheet 1 2 5 2 Troubleshooting Chart 5 4 2 1 Cabinetto Rack Mount Conversion 2 1 Dee I Ve EE eec 5 5 Power Amplificat
79. er Street San Diego 92106 Tel 714 223 8103 TWX 910 335 2000 COLORADO 7965 East Prentice Englewood 80110 Tel 303 771 3455 TWX 910 935 0705 CONNECTICUT 508 Tolland Street East Hartford 06108 Tel 203 289 9394 TWX 710 425 3416 111 East Avenue Norwatk 06851 Tel 203 853 1251 TWX 710 468 3750 DELAWARE 3941 Kennett Pike Wilmington 19807 Tel 302 655 6161 TWX 510 666 2214 FLORIDA 0 Box 545 Suite 106 3999 2nd Avenue Miami Shores 33153 Tel 305 758 3626 TWX 810 848 7262 P O Box 20007 Herndon Station 32814 621 Commonweaith Avenue Orlando Tel 305 841 3970 TWX 810 850 0113 P O Box 8128 Madeira Beach 33708 410 150th Avenue St Petersburg Tel 813 391 0211 TWX 810 863 0366 GEORGIA P O Box 28234 450 interstate North Atlanta 30328 Tel 404 436 5181 TWX 810 766 4890 ILLINOIS 5500 Howard Street Skokie 60076 Tel 312 677 6400 TWX 919 223 3613 CANADA ALBERTA Hewlett Packard Canada Ltd 11745 Jasper Ave Edmonton Tel 403 482 5561 TWX 610 831 2431 BRITISH COLUMBIA Hewlett Packard Canada Ltd 304 1037 West Broadway Vancouver 9 Tel 604 738 5301 TWX 610 922 5059 INDIANA 4002 Meadows Orive Indianapolis 46205 Tel 317 546 4891 TWX 810 341 3263 LOUISIANA 0 Box 856 1942 Williams Boulevard Kenner 70062 Tel 504 721 6201 TWX 810 955 5524 MARYLAND 6707 Whitestone Road Baltimore 21207 Tel 301 9
80. esistive string from the high voltage power supply regulated output to ground When an anode type tube is used adjustment of R53 sets the voltage on the anode thus setting beam cur rent The anode voliage is set to the value that will produce at least 1 watt at the RF OUTPUT with the application of 1 milliwatt or less at RF INPUT R53 is inoperative for those tubes that do not have an anode 4 18 306 VOLT REGULATION CIRCUIT 4 17 This regulated power supply includes the 300 volt regulator V6 and 300 volt control tube V8 The circuit isa series regulated supply similar in operation to that of the high voltage power supply The supply derives its voltage from the regulated high voltage power supply and thus produces a nearly ripple free highly regulated voltage tothe modulator There isno control for adjustment of the 300 volt modulator power 01280 5 Section IV Paragrapbs 4 9 to 4 22 supply All components are fixed ro provide the 300 volt output tothe modulator regardless of the high volt age power supply output The 350 volt supply is the reference for the 300 volt regulated power supply 4 18 MODULATOR 4 19 A block diagram of the modulator is shown in fig ure 4 4 The modulator includes an amplifier circuit and a regulated power supply Theamplifier circuitis a dc coupled circuit that sets the gain characteristics of the traveling wave amplifier tube and accepts exter nally applied amplitude modulation signals fro
81. f Minneapolis Minn Varian Assoc Elmac Div Kelvin Electric Co Digitran Co Transistor Electronics Corn Westinghouse Electric Corp lectronic Tube Div Elmira M Y Filmohm Corp New York Y Cinch Graphik Co City of Industry Calif Avnet Corp Culver City Calif Fairchild Camera amp last Corp Semiconductor Div Minnesota Rubber Co Birtcher Corp The Technical Wire Products Inc Continental Device Corp Raytheon Mfg Co Semiconductor Div Mountain View Calif Shockley Semi Conductot Laboratories Palo Alts Calif Hewlett Packard Co Boonton Radio Div Rockaway N J Los Angeles Calif Pomona Calif Mountain View Calif Minneapolis Minn Monterey Park Calif Cranford 4 2 Hawthorne Calif U S Engineering Co Blina Delbert Co Burgess Battery Co Niagata Falls Ontario Canada Bristol Co The Waterbury Conn Sloan Company Sun Vattey Calif ITT Cannon Electric Ine Phoenix Div Phoenix Arizona CBS Electronics Semiconductor Operations Div of C B S Inc Lowell Mass Indianapolis ind Costa Mesa Calif Houston Texas Sun Valley Calif Chicago III Met Rain Babcock Relays Div Texas Capacitor Co Atohm Electronics Electro Assemblies Inc Mallory Battery Go of Canada Ltd Toronto Ontario Canada General Transistor Western Corp Los Angeles Calif Berkeley Calif Niagara Fails N Y Berne Ind Ti Tal lac Carborundum Co CTS of Inc Chicago Telephone o
82. f California inc So Pasadena Calif Bay State Electronics Corp Waltham Mass Teledyne inc Microwave Div Palo Alto Calif Duncan Electronics inc Costa Mesa Calif General Instrument Corp Semiconductor Div Products Group Newark N J Imperial Electronic Inc Buena Park Calif Melabs Inc Palo Alto Calif Philadelphia Handie Co Camden N J Clarostat Mfg Co Dover N H Nippon Etectric Co Ltd Tokyo Japan Code No 12881 12930 12954 13103 13396 13835 14099 14193 14298 14433 14493 14655 14674 14152 14960 15203 15291 15558 15566 15772 15818 15909 16037 16179 16352 15588 16758 11109 17474 17675 17145 18042 18476 18486 18583 18873 18911 19315 19500 19644 19701 20183 21226 21335 21520 23783 24455 24655 26365 26462 26992 28480 33173 35434 36196 37942 39543 40320 42190 43990 Table 6 3 Manufacturer Address Metex Electronics Corp Clark N J Delta Semiconductor Inc Dickson Electronics Corp Thetmotloy Dallas Texas Telefunken GmbH Hanover Germany Midland Wright Div of Pacific Industries Inc Kansas City Kansas Newbury Park Calif Calif Resistor Corp Santa Monica Calif American Components inc Conshohocken ITT Semiconductor A Div of Int Telephone amp Telegraph Corp West Palm Beach Fla Hewlett Packard Company Loveland Colo Cornell Dublier Electric Corp Newark N Corning Glass Works Corning N Y Electio Cub
83. fier combination can be used in many applications where a generous amountof micro wave power is required Typical applications are 1 wide range antenna measurements to plot patterns to determine efficiency directivity etc 2 portable low cost means of providing moderate power micro wave signal sources for field testing a microwave installation 3 16 CONSTANT OUTPUT AMPLIFICATION Many amplifier applications require a constant output level characteristic Although the Model 493A traveling wave amplifier s saturated output characteristic can be used to provide nearly constant power output the use of feedback circuitry provides a more versa tile and effective means ofcontrol Qne such arrange ment for obtaining relatively constant rf output power is shown in figure 3 3 In this circuit a portion of the rf signal is coupled from the traveling wave amplifier tube output through a directional coupler to a detector such as a crystal rectifier The detected rf output is then amplified and applied to the MOD INPUT With this arrangement any tendency for the output power level to increase is immediately detected amplified and fed back to reduce the gain of the amplifier Con versely any reduction in output level increases the 3 1 Section HI Model 493A 495A Figure 3 1 STANDBY ON CATHODE CURRENT GAIN ar E 493A MICROWAVE AMPLIFIER LI
84. g Co inc Woodstock N Y Vector iecttonic Co Glendale Calif Western Washer Mfg Co Los Angeles Calif Cait Fastener Co Cambridge Mass New Hampshire Ball Bearing Inc Peterborough N H General instrument Corp Capacitor Div Darlington 5 0 Los Angeles Calif Springfield N J ITT Wite and Cable Div Victory Engineering Corp Beudix Corp Red Bank Div Bank N Hubbell Corp Mundelein II Smith Herman H Inc Brooklyn N Y Central Screw Co Chicago 111 Gavitt Wite and Cable Co Div of Amerace Corp Brookfield Mass Burroughs Corp Electronic Tube Div Plainfield NJ Union Carbide Corp Consumer Prod Div New York N Y Model Eng and Mfg Inc Huntington tad Loyd Scruggs Co Festus Mo Aeronautical last amp Radio Co Lodi N J Arco Electronics Int Great Neck N Y A J Glesener Co inc Francisco Calif TRW Capacitor Div Ogallata Neb Sarkes Tarzian inc Bloomington ind Boonton Molding Company Boonton N J From FSC Handbook Supplements H 1 Dated JULY 1965 H4 2 Dated NOV 1962 01280 5 Models 493A 495A TABLE 6 3 CODE LIST OF MANUFACTURERS Continued Code No Manufacturer Address 85471 A B Boyd Co San Francisco Calif 85474 R M Bracamonte amp Co San Francisco Calif 85660 Koiled Kords inc Hamden Conn 85911 Seamless Rubber Chicago Hi 86197 Clifton Precision Products Co Inc Clifton Heights Pa 86579 Precision Rubber
85. h attenuator un affected Electron bunches emerging from attenuator duce a new rf signal on helix New rf signal is the same frequency as the original rf signal applied Field of newly induced rf signal interacts with bunched electrons to begin the amplification process over again For a short distance the velocity of the electron bunches is reduced slightly due to the large amount of energy absorbed by the formation of the new rf signal Amplification increases as the greater velocity of the electron beam pulls the electron bunches more nearly in phase with the electric field of the rf signal At point of desired amplification the amplified rf signal is coupled out of the helix NOTE THAT THE AMPLIFIED RF SIGNAL IS A NEW SIGNAL WHOSE ENERGY IS WHOLLY SUPPLIED BY THE BUNCHED ELECTRON BEAM Figure 4 2 TWT and How it Works 1 2 RF signal coupled into helix 3 the rf signal 4 5 the rf signal sultant amplification 6 4 2 01280 2 Model 493A 495A electron field created by the electron beam and creases the amplitude of the signal on the helix thus producing the desired amplification Note The ceramic magnets used in twt 493A will defocus the electron beam if ambient temper ature of the instrument exceeds 359 C Thus with twt operating above this temperature poor power amplification performance can be expected 4 9 REGULATED HIGH VOLTAGE POWER SUPPLY 4 10 A block diagr
86. hase or number of hours of instru ment operation Forinformation regarding warranty contact your local Hewlett Packard field office A Sheet for your use is included in the appendix of this manual 1 1 Model 493A 495A Section 1 Paragraphs 1 1 to 1 23 SECTION I GENERAL INFORMATION 1 1 INTRODUCTION 1 2 This manual provides instructions for installa tion operation circuit description and maintenance of the Models 493A and 495A Microwave Amplifiers The manual applies directly to instruments which carry the serial number prefix indicated on the title page The Model 495A Microwave Amplifier is shown in figure 1 1 Specifications for both instruments are given in table 1 1 1 3 DESCRIPTION 1 4 The Models 493A and 495A are broadband linear amplifiers that provide signal amplification to at least 30 db The Model 493A covers the 4 0 to 8 0 gc range the Model 495A covers the 7 0 to 12 4 gc range Both instruments produce atleast 1 watt at the output with the application of 1 milliwatt or less at the input 1 5 The Models 493A and 495A output can be ampli tude modulated Externally supplied modulation sig nals are applied to the MOD INPUT Since the modu lation circuit is dc coupled an external leveler circuit can be connected at the MOD INPUT to obtain rela tively flat power output across the band 1 6 The Models 493A and 495A require no tuning and are particularly useful for signal amplification over a bro
87. i fier V103 and TWT V7 Successive regulation is provided by CR304 and CR305 to hold the base of Q301 constant The filament adj R306 sets the regulated output voltage 4 29 Protection in the event that the filament voltage exceeds the limits set by the filament adj R306 is pro vided by the relay K304 and CR308 304 and CR308 are placed in parallel withthe filaments Ifthevoltage limit set by filament adjust R306 is exceeded CR308 will break down and K304 will energize opening the filament circuit and removing ac power to high voltage power supply HIGH VOLTAGE TO REGULATED HIGH VOLTAGE OUTPUT TO HELIX 2 K3 1 HELIX OVERLOAD RELAY RELAY stadi TO JUNCTION OF R67 AND R68 Figure 4 5 Relay Sequence 01280 5 4 5 Section IV Paragraphs 4 23 to 4 29 4 23 RELAY SEQUENCE 4 24 A simplified illustration of the relay sequence is shown in figure 4 5 When the Model 493A is first turned to ON power is applied tothe transformer T2 Filament voltage is applied to all tubes in the instru ment as well as to the 90 second time delay relay K1 After 90 seconds have elapsed relay will close completing current flow path for delay slave relay K2 The relay K2 will energize 1 completing the current path to the high voltage transformer 1 and 2 it will act as a holding relay for itself by bypassing the con tacts at the time delay relay The instru
88. ii HIGH VOLTAGE LEVEL inse ADJ DIFFERENTIAL AMPLIFIER 5 REFERENCE TUBES V3 V4 300 R44 49 CATHODE R65 380 VOET 350V REG OL VOLT CURRENT POWER SUPPLY CONTROL ADJ REGULATOR REG TUBE 2 v6 v8 MODULATOR Figure 4 3 Block Diagram of Regulated High Voltage Power Supply R120 300V INPUT INPUT OUTPUT DIFFERENTIAL DIFFERENTIAL 8 AMPLIFIER AMPLIFIER s To V403A V4038 V404A V4048 GRID MODULATOR SUPPLY AMPLIFIER AND TO CRIO lt 3 REGULATOR 9 V4018 V401A HOLD OFF TRANSISTOR 0401 REFERENCE TUBE v402 R417 ua 4 Y 4 4 lt 350V FROM CIO2A Pigure 4 4 Block Diagram of Modulator 4 4 01280 2 Model 493A 495A 4 23 RELAY SEQUENCE 4 24 A simplified illustration of the relay sequence is shown in figure 4 5 When the Model 493A is first turned to ON power is applied tothe transformer T2 Filament voltage is applied to all tubes in the instru ment as well as to the 90 second time delay relay K1 After 90 seconds have elapsed relay K1 will close completing current flow path for delay slave relay K2 The relay K2 will energize 1 completing the current path to the high voltage transformer 1 and 2 it will act as a holding relay for itself by bypassing the con tacts at the time delay relay The instru
89. in the cable running to the output power meterhave been accounted for c Microwave output power should be 1 watt or more If it is not optimize the collector helix voltage high voltage level adj R57 for maximum power reading on the power meter d Optimize grid voltage 1f power at minimum power point is still less than 1 watt increase anode voltage to produce an rf output of at least 1 watt e Connect a dc clip on milliammeter to the orange or yellow lead located on the board directly behind the current meter see figure 5 3 Note Another method of measuring helix current is to place a VOM across R202 Since R202 is 1K volts equal milliamperes f Set signal generator frequency to low end of the band optimize the GAIN control for maximum helix current The helix current should be less than 4 ma g Ifthe helix current is greater than 4 ma or rf output power is still below 1 watt re optimize the collector helix and grid voltage h Adj meter sensitivity control R205 for correct meter indication within meter Rated Power limit 01280 5 Model 493A 495A 5 31 MODULATOR ADJUSTMENT 5 32 FREQUENCY RESPONSE a Connect the Model 493A 495A as shown in fig ure 5 6 b Rotate GAIN control full clockwise c Set square wave generator frequency to 10 kc and adjust square wave generator amplitude for modulator output of 10 volts peak to peak d Adjust high frequency adj R411 see figure 5 3 for optimum squ
90. ion Setup 5 8 3 1 Turn On 3 2 5 6 Frequency Response Setup 9 9 3 2 Amplitude Modulation e 3 3 5 7 Bandwidth Setup 5 10 3 3 RF Leveler Setup e s e lt s 5 4 5 8 Modulator On Off Ratio 5 10 5 9 Residual AM Check 5 11 4 1 Model 493A 495A Block Diagram e 4 1 5 10 Filament Circuit Schematic 5 13 4 2 TWT and How it Works e 4 2 5 11 High Voltage Board A1 5 14 4 3 Block Diagram of Regulated High Voltage 5 12 High Voltage Power Supply Power Supply us e o HS Schematic e 5 15 4 4 Block Diagram of Modulator 4 4 5 13 Modulator Board A400 5 16 4 5 Relay Sequence ee eee 4 5 5 14 Modulator Schematic 5 17 01280 4 t pO ph pa LIST OF TABLES umber Title Page Specifications e f 0 Test Equipment Required 5 2 TWT Lead Identification es 5 5 Reference Designation Index 6 2 Replaceable Parts 4 16 9 ii Section I Figure 1 1 and Table 1 1 Model 493 495 Figure 1 1 The Model 495A Microwave Amplifier The Model 493A Microwave Amplifier is exactly the same in its physical construction Table 1 1 Specifications FREQUENCY RANGE Model 493A 4 to 8 Gc Model 495A 7 to 12 4 Gc POWER OUTPUT 1 watt or greater with 1 mw or less input GAIN 30 db or greater with 1 mw or less input GAIN VARIATION WITH FREQUENC Y
91. ire Corp Philadelphia Pa American Machine amp Foundry Co Potter amp Brumfield Div Princeton Ind TRW Electronic Components Div Camden N J General instrument Corp Rectifier Div Brooklyn N Y Resistance Products Co Harrisburg Pa Rubbercraft Corp af Calif Torrance Calif Shakeptoof Division of 5 Tool Works Elgin fll Signal Indicator Corp New York N Y Struthers Dunn Inc Pitman N J Thompson Bremer amp Co Chicago til Tilley Mfg Co San Francisco Calif Stackpole Carbon Co St Marys Pa Standard Thomson Corp Tinnerman Products Inc Transformer Engineers Ucinite Co Waldes Kohinoor lnc Veeder Root Inc Wenco Mig Co Continental Witt Electronics Corp Philadelphia Pa New Rochelle N Y Waltham Mass Cleveland Ohio San Gabriel Calif Newtonville Mass Long Island City N Y Hartford Conn Chicago lil Zierick Mig Corp Code No 80031 80120 80130 86131 80207 80223 80248 80294 89411 80486 80509 80583 80640 81030 81073 81095 81312 81349 31483 31541 31860 82042 82847 82142 82170 82209 82219 82376 82389 82647 82768 82866 82877 82893 83053 33058 83086 83125 83148 83186 83298 83315 83330 83385 83501 83594 83740 83777 83821 83912 84171 84396 84411 84970 85454 Models 493A 495A Manufacturer Address Mepco Division of Sessions Clock Co Morristown N J Schnitzer Alloy Products Elizabeth
92. la Israel Ltd American Trading Co Korea Lid Engineering Company Ltd 8 J Titbury Ltd 16 Kremenetski Street P 0 1103 9 Jalan Kilang Box 2754 Tel Aviv Tel 35021 4 lines Cable BASTEL Tel Aviv Telex Bastel 033 569 JAPAN Yokogawa Hewlett Packard Ltd Nisei ibaragi Bide 2 2 8 Kasuga Ibaragi Shi Osaka Tel 0726 23 1641 Yokogawa Hewlett Packard Ltd ito Building No 53 Kotori cho Nakamura ku Nagoya City Tef 551 0215 Yokogawa Hewlett Packard Ltd Ohashi Building No 59 l chome Yoyogi Shibuya ku Tokyo Tel 370 2281 Telex YHPMARKET TOK 23 724 Dae Kyung Bldg 170 Sejong Ro Chongro Ku Seoul Tel 25 5841 Cable Seoul LEBANON Constantin E Macridis Clemenceau Street Clemenceau Center Beirut Tel 220846 Cable ELECTRONUCLEAR Beirut MALAYSIA MECOMB Malaysia Ltd 2 Lorong 13 6A Section 13 Petaling Jaya Selangor Cable Kuala Lumpur NEW ZEALAND Hewlett Packard N 2 Ltd 32 34 Kent Terrace P O 9443 Wellington N Z Tel 56 409 Cable HEWPACK Wellington PAKISTAN EAST Mashko amp Company Ltd 31 Jinnah Avenue Bacca Tel 80058 Cable NEWDEAL Dacca Singapore 3 Tel 642361 3 Cable MECOMB Singapore SOUTH AFRICA F H Flanter amp Co Pty Ltd Hill House 43 Somerset Rd Cape Town Tel 2 9711 Cable AUTOPHONE Cape Town Telex 7038 F Flanter amp Co Ply Ltd 607 Pha
93. lable from your Hewlett Packard Sales and Service Office or from the Hewlett Packard Company SHIPPING INSTRUCTIONS The following instructions are included to aid you in preventing damage in transit Package your tube carefully no allowance can be made on broken tubes 1 Carefully wrap tube in 1 4 inch thick cellulosic cushioning cotton batting or other soft padding material Cable assemblies and other accessories not rigidly mounted to the tube should be padded and wrapped Separately to prevent damage to the tube during shipment Wrap the above in heavy kraft paper Pack in a rigid container which is at least 4 inches larger than the tube in each dimension Surround the tube with at least 2 inches of shock absorbing material Be certain that the packing is tight all around the tube Tubes returned from outside the continental United States should be packed in a wooden box 6 Mark container FRAGILE and ship prepaid via Airfreight or Railway Express Do not ship via Parcel Post Or Air Parcel Post since experience has shown that fragile items are more apt to be damaged when shipped by these means Note Tubes with permanent magnets can interfere with magnetic compasses For air shipment plainly mark container MAGNETIZED MATERIAL In warranty tubes purchased from Hewlett Packard may be returned with a completed warranty Claim Form to your local Hewlett Packard Sales and Service Office or to Hewlett Packard Company Cu
94. lliammeter not necessary for this check Refer to table 5 1 Test Equipment Required Set up the signal generator for 1 mw cw output at 4 0 gc for 493A 12 4 gc for 495A d Set power meter to 3 watt range zero set the power meter e Switch Model 493A primary power switch from STANDBY to ON f Readingon power meter shouldbe atleast 1 watt Specification At least 1 watt at the output with appli cation of 1 mw at the input Remember to compensate for the losses in cable between the twt amplifier and the power meter 5 37 GAIN CONTROL POWER ON OFF RATIO a Set up the Model 493A as shown in figure 5 8 power supply power off Signal generator set up for a mw output at microwaveamplifierlow power point b Rotate Model 493A GAIN control full counter clockwise record power meter reading c Rotate Model 493A GAIN control full clockwise record power meter reading Difference between the two readings should be at least 20 db Specifications Modulation On Off Ratio Power OUTPUT change should be at least 20 db with the GAIN control OSCILLOSCOPE hp I75A CONNECT TO EID OF El BOARD hp 493A 495A MICROWAVE AMPLIFIER hp 10503A CABLE 500 TERMINATION L0 M 449BC Figure 5 6 Frequency Response Setup 01280 2 5 9 Section V Model 493A 495A Figures 5 7 and 5 8 OSCILLOSCOPE SIGNAL GENERATOR hp T5A hp 6iaB hp 620A hp 626A 4 7gc 7 ilge 1 12 4gc 0090 USE THIS
95. m dc to 500kc de to 100 kc for large signals The regulated power supply provides 350volts to the amplifier cir cuit and high voltage power supply 4 20 AMPLIFIER CIRCUIT The amplifier circuit includes Differential Amplifier V403 Output Ampli fier V404 and Hold off Transistor 0401 External modulation signals are applied through the A section of the Differential Amplifier V403 to the output am plifier V404 V404 output is applied to the grid of the traveling wave tube Degenerative feedback is supplied from the output of V404 to V403 to increase stability and frequency response 4 21 Gain of the TWT average rf output level is set by adjusting the GAIN control in the B section of the Differential Amplifier V403 The voltage at the grid of the TWT is set at some negative potential The Gain Limit Adj control R418 sets the highest positive voltage on the grid of the TWT Hold off transistor Q401 protects the TWT from a transient when the in strument is switched from STANDBY to ON Normally the application ofa step function positive voltage when turning on the 300 volt supply to the modulator would result in a positive transient spike to the TWT grid This transient spike would cause excess helix current to be drawn and the helix overload relay to operate To protect the instrument the Hold off Transistor 401 applies a positive voltageto V403B duringthe stand by period This positive voltage saturates V403B holding V404 in
96. ment is now operating normally V1 V2 and V5 filaments and relays K1 K2 and K3 are held 200 volts above the helix 4 25 When the instrument is placedon STANDBY the sequence will be the same as described in paragraph 4 24 but highvoltage will be applied tothe instrument after 90 seconds only if the Model 493A primary power switch is placed in the ON position The STANDBY position permits the turning of RF power on or off instantly by switching from STANDBY to ON or from ON to STANDBY once the initial 90 second time delay has elapsed 4 26 In the event excessive helix current is drawn by the traveling wave amplifier tube a protective device the overload relay K3 will energize s FAIL SAFE PRIMARY RELAY POWER K304 SUPPLY FILAMENT CIRCUIT ON 2 FI STANDBY B2 DELAY 90 SECOND TIME DELAY SLAVE Section IV Paragraphs 4 23 to 4 29 Energizing K3 interrupts the current path for delay slave relay K2 which in turn removes power fromthe high voltage transformer T1 CR22 acts asa half wave rectifier for the 6 3 vac signal when the overload re lay K3 is energized This rectified output supplies approximately 2 5 ma tothe overload relay K3 holding it energized once high voltage has been removed 4 27 REGULATED FILAMENT SUPPLY 4 28 The filament supply is a conventional series regulated power supply that supplies approximately 6 3 volts de to the filament of the differential ampl
97. ment is now operating normally Vi V2 and V5 filaments and relays K1 K2 and K3 are held 200 volts above the helix 4 25 When the instrument is placedon STANDBY the sequence will be the same as described in paragraph 4 24 but high voltage will be applied tothe instrument after 90 seconds only if the Model 493A primary power switch is placed in the ON position The STANDBY position permits the turning of RF power or off instantly by switching from STANDBY to ON or from ON to STANDBY once the initial 90 secondtime delay has elapsed 4 26 In the event excessive helix current is drawn 5 to 7 ma by the traveling wave amplifier tube a pro tective device the overload relay K3 will energize 4 6 Model 493A 495A Energizing K3 interrupts the current path for delay slave relay K2 which in turn removes power fromthe high voltage transformer CR9 acts asa half wave rectifier for the 6 3 vac signal when the overload re lay K3 is energized This rectified output supplies approximately 2 5 ma tothe overload relay K3 holding it energized once high voltage has been removed 4 27 REGULATED FILAMENT SUPPLY 4 28 The filament supply is a conventional series regulated power supply that supplies approximately 6 3 volts dc to the filament of the differential ampli fier V103 and TWT V7 Successive regulation is provided by CR304 and CR305 to hold the base 040301 constant The filament adj R306 sets the regulated
98. mplete ad dresses are listed above MANITOBA Hewlett Packard Co Ltd 511 Bradford Ct St James Winnipeg Tel 204 786 7581 NOVA SCOTIA Hewlett Packard Canada Ltd 7001 Mumford Road Suite 356 Halifax Tel 902 455 0511 TWX 610 271 4482 ONTARIO Hewlett Packard Canada Ltd 880 Lady Ellen Place Ottawa 3 Tel 613 722 4223 TWX 610 562 1952 Hewlett Packard Canada Ltd 1415 Lawrence Avenue West Toronte Tel 416 249 9196 TWX 810 492 2382 QUEBEC Hewlett Packard Canada Ltd 275 Hymus Boulevard Pointe Claire Tet 514 697 4232 TWX 619 422 3022 Telex 01 20607 FOR CANADIAN AREAS NOT LISTED Contact Hewlett Packard Can ada Ltd jn Pointe Claire at the complete address listed above ARGENTINA CHILE ECUADOR MEXICO PERU VENEZUELA Hewlett Packard Argentina Hector Calcagni P Laboratorios de Radio Ingenieria Hewlett Packard Mexicana S A Fernando Ezeta B Hewlett Packard De Venezuela S A C e Casilla 13942 Calle Guayaquil 1246 de CY Avenida Petit Thouars 4719 Lavalle 1171 3 Buenos Aires Tel 35 0426 35 0627 35 0431 Telex 012 1009 BRAZIL Hewlett Packard Do Brasil Le C Ltda Rua Coronel Oscar Porto 691 Sao Paulo 8 SP Tel 71 1503 Cable HEWPAK Sao Paulo Hewlett Packard Do Brasil Le C Ltda Avenida Franktin Rooseveit 84 grupo 203 Rie de Janeiro 2 39 GB Tel 32 9733 Cable HEWPAK Rio de Janeiro Estado 215 Oficina 101
99. n specifications POT potentiometer VAR variable tubes and transistors M milli 1073 PP peak to peak selected for best MEG meg 106 PT point w watts E performance will be METFLM metal film w with 3 supplied if ordered MFR manufacturer RECT rectifier WO without 5 by stock numbers MINAT miniature RP radio frequency WwW wirewound 01280 2 6 1 Section VI Model 493A 495A Table 6 1 Tabie 6 1 Reference Designation Index Circuit p Stock No Description Note Reference L AL 495A 658 ASSY HV REGULATOR BOARD A2 495A 65A ASSY HV RECTIFIER THRU 199 NOT ASSIGNED A200 495 65 ASSY TWT TEST A201 THRU A299 NOT ASSIGNED A300 489 650 ASSY F LAMENT REGULATOR A201 THRU A399 NOT ASSIGNED A400 495 650 ASSY NODULATOR BOARD BL 3160 0026 FAN MUFF IN c6 0150 0084 C FXD CER 0 1 UF 80 20 SOVDCW THRU c9 NOT ASSIGNED C10 0180 0024 C FXD ELECT 40 UF 450VDCW C11 0160 0121 C FXD PAPER 2 5 X 5 5 UF 10 2000VDCW Cle 0150 0024 C FXD CER 0 02 UF 80 20 600VDCW C15 0150 0024 C FXD CER 0 02 UF 80 20 600VDCW Cia 0150 0012 C FXD CER 0 01 UF 20 1000VDCW C15 0160 0384 C FXD PAPER 5600 PF 80 20 5000VDCW C16 0180 0058 C FXD ELECT 50 UF 100 10 25V0CW C1 0150 0024 C FXD CER 0 02 UF 80 20 600VDCW C18 0150 0012 C FXD CER 0 01 UF 20 1000VDCW C19 THRU C100 NOT ASSIGNEO 101 0180 0024 C FXD ELECT 40 UF 450VDCW C102 0180 0012 C FXD ELECT 2 X 20UF 450VOCW C105 THRU C108 NOT ASSIGNED C109 01
100. output voltage 4 29 Protection inthe event that the filament voltage exceeds the limits set by the filament adj R306 is pro vided by the relay K304 and CR308 K304 and CR308 are placed in parallel withthe filaments Ifthe voltage limit set by filament adjust R306 is exceeded CR308 will break down and K304 will energize opening the filament circuit and removing ac power to high voltage power supply 01280 3 Model 493 495 Section V Paragraph 5 1 to 5 9 SECTION V MAINTENANCE 5 1 AIR FILTER MAINTENANCE 5 2 The air filter is located atthe rear of the instru ment Inspect air filter frequently and clean when ever an appreciable amount of dirthas collected on it Proper maintenance of the filter will produce longer twt tube and component life 5 3 The filter should be washed in hot water and detergent to throughly remove all dirt deposits After filter is clean allow it to dry Compressedair speeds the process 5 4 To be most effective the filter must be coated with a dirt gathering adhesive While light machine oil is satisfactory we recommend using a water soluble adhesive such as Super Filter Coat manu factored by Research Products Corporation of Madison 1 Wisconsin 5 5 This productis available in 1 5 fl ounce cans equipped with a handy spray applicatorat most heating supply stores You can also obtain it from your Engineering Representative The Stock Number is 3150 0002 RIGH
101. r Part No i 0150 0015 C VAR CER 3 12 PF NPO 28480 0150 0015 1 0140 0149 C FXD MICA 470 PF 5 300VDCW 04062 DM15F471J 2 0140 0194 C FXD MICA 110 PF 5 300VDCW 04062 0 15 1119 300V 1 0140 0205 C FXD MICA 30 PF 5 5OOVDCW 04062 DM15E300J 500V 1 0140 0208 C FXD MICA 680 PF 5 300VDCW 04062 DM15F681J 1 0150 0011 C FXD 1 5 PF 20 500VDCW 78488 GA a 0150 0012 C FXD CER 0 01 UF 20 1000VDCW 28480 0150 0012 2 0150 0024 C FXD CER 0 02 UF 80 2096 600VDOW 71590 00205 5 0150 0052 C FXD CER 0 05 UF 20 4OOVDCW 56289 25C17A 50000PF 2 0150 0084 C FXD CER O 1 UF 80 20 SOVOCW 56289 33041 2 0160 0013 C FXD MY 0 1 UF 10 AOOVDCW 56289 160P 10404 1 0160 0056 C FXD PAPER 0 047 UF 10 1000VDCW 56289 160P473910 1 0160 0121 C FXD PAPER 5 5 X 3 5 UF 10 2000VDCW 56289 P49900 1 0160 0384 C FXD CER 5600 PF gt 80 20 3000VDCW 71590 DA172 098CB p 0180 0012 C FXD ELECT 2 X 20 UF 450VDCW 28480 0180 0012 1 0180 0024 C FXD ELECT 40 UF 50 10 450VDCW 56289 D32441 2 0180 0028 C FXD ELECT 2 X 1500 UF 15VDCW 56289 032442 1 0180 0058 C FXD ELECT 50 UF 100 1006 25VDCW 56289 028110 1 0180 0061 C FXD ELECT 100 UF 100 10 15VDOW 56289 5001078015004 1 0180 0064 C FXD ELECT 500 UF 100 1096 3VDCW 56289 052520 1j 0360 0017 BOARD TERMINAL 75582 601 Y 8 1 0370 0026 KNOB GAIN ADJUST 28480 0270 0026 1 489 650 FILAMENT REGULATOR BOARD 28480 489A 650 11 489A 650 1 BLANK PRINTED CIRCUIT BOARD 28480 489A 65
102. r Part No TQ 0687 6801 R FXD COMP GE OHM 10 1 2 6801 1 0689 2055 R FXD 20K OHM 5 1W 68 2035 1 0689 5115 R FXD COMP 510 OHM 5 1 68 5115 2 0690 1011 R FXD COMP 100 OHM 10 1W 01121 GB 1011 5 0690 1041 R FXD COMP LOOK OHM 10 1W 01121 GB 1041 4 0690 2241 R FXD COMP 220K OHM 10 1W 01121 68 2241 2 0690 4701 R FXD COMP 47 OHM 10 1W 01121 GB 4701 1 0690 4751 R FXD COMP 47K OHM 10 1W 01121 GB 4731 1 0690 8231 R FXO COMP 82K OHM 10 1W 01121 GB 8251 1 0692 4745 RiFXD COMP 470K OHM 5 2w 01121 HB 4745 14 0693 1021 COMP 1000 OHM 10 2W 01121 HB 1021 i 0693 2221 R FXD COMP 22K OHM 10 oW 01121 HB 2231 1 0692 5551 R FXD COMP 22K OHM 10 2W 01121 HB 5551 1 0693 4731 R FXD COMP 47K OHM 10 2W 01121 HB 4721 8 0693 5651 R FXD COMP 56K OHM 10 2W 01121 HB 5631 1 0727 0045 R FXD DEPC 100 OHM 1 1 21 28480 0727 0043 2 0727 0100 R FXD DEPC 1000 OHM 1 1 2W 19701 CD 1 20 2 0727 0119 R FXD DEPC 2000 OHM 1 1 20 19701 DC 1 20 4 0727 0165 R FXD DEPC 13 2K OHM 1 1 2W 19701 DC 1 20 1 0727 0208 R FXD DEPC LOOK OHM 1 1 2W 19701 OC 1 20 an 0727 0221 R FXD DEPC 200K OHM 1 1 2W 19701 DC 1 2 1 0727 0222 R FXD DEPC 214K 1 1 2W 19701 1 20 2 0727 0250 R FXD DEPC 284K 1 1 20 19701 0C 1 2C 1 0727 0255 R FXD DEPC 360K 1 1 2W 19701 DC 1 2B 1 0727 0257 R FXD DEPC 296K 1 1 2W 19701 DC 1 2C 1 0727 0240 R FXD DEPC 405K 19701 DC 1 2 2 0727 0245 DEPC 500K 19701 DC 1 2C 5 0727 0246 R FXD DEPC 606K
103. r Frequency Range 4 0 to 8 0 ge Pigure 5 5 db Model 618B 8 0 to 12 4 gc through 5 9 Power Output 1 mw d Model 620A Model 626A Power Meter Range 0 1 mw to 3 w Figures 5 5 Model 434A Frequency Range 4 0 to 8 0 gc anos 8 0 to 12 4 gc Accuracy Within 5 of full scale Power Supply Regulated Output 0 to 20 volts Figure 5 8 De Model 721A Wide Range Frequency Range 1 kc 500 kc 4 29 Figure 5 7 Model 200CD Wide Oscillator Output to 600 ohms 10 volts Range Oscillator Oscilloscope Band Pass dc to 1 mc Figures 5 6 Model 175A and 5 7 with Sensitivity 0 5 v cm Square Wave Generator Crystal Detector Frequency Range 1 to 10 kc Rise Time 0 01 psec Signal Amplitude 10 volts Frequency Response 4 0 to 8 0 gc 8 2 to 12 4 gc Square Law Characteristic 41 db matched pair x 2 db Sensitivity 0 1 v mw for Model 495A only NO marking used for both Models 493A and 495A A VOM used in conjunction with the current monitoring resistors R201 R202 R203 can also be used to measure current Model 1750A 1751A Vertical Amplifier Figures 5 6 Model 211A and 5 9 9 Model 423A Crystal Detector Figures 5 7 and 5 9 5 2 01280 2 Model 4934 495 5 10 TEST EQUIPMENT REQUIRED 5 11 Test equipment used in the calibration of the Model 493A is given in table 5 1 Test Eq
104. r tubes twt s utilize periodic permanent magnet focusing thus they are lightweight compact and consume less power than solenoid focused twt s 1 8 An instrument in one frequency range can be converted to an instrument in another frequency range since both the Models 493A and 495A are identical except for traveling wave amplifier tube 1 9 Since the Models 493A and 495A are identical except for tbe twt the manual will be discussed in terms of the Model 493A The Model 495A will be mentioned only when its operation differs from that of the Model 493A 1 10 The Model 493A uses a modular design which includes a kit thatallows conversion to eithera cabinet or rack mount configuration 1 11 INSTRUMENT OPTION 1 12 The option 01 Model 493A microwave amplifier RF INPUT and OUTPUT connectors are located on the rear panel In all other respects the option01micro wave amplifier is the same as a regular microwave amplifier 01280 3 1 13 INSTRUMENT IDENTIFICATION 1 14 Hewlett Packard uses a two section eight digit serial number 000 00000 If the first three digits of the serial number on your instrument do not agree with those on the title page of this manual change Sheets supplied with the manual will define differences between your instrument and the Model 493A described in this manual 1 15 COOLING SYSTEM 1 16 The Model 493A uses the forced air method for obtaining the desired temperature within the instru ment
105. ries Sunnyvale Calif Hi Q Div of Aerovox Corp Olean N Y Thordarson Meissner inc Mt Carmel IH Solar Manufacturing Co Los Angeles Calif Carlton Screw Co Chicago Microwave Associates Inc Burlington Mass Excel Transformer Co Oakland Calif Industrial Retaining Ring Irvington NJ Automatic amp Precision Mfg Englewood N J Reon Resistor Corp Yonkers N Y Litton System ine Adter Westrex Commun Div New Rochelle N Y R Troncis Inc Jamaica N Y Rubber Teck Inc Gardena Calif Hewlett Packard Co Moseley Div Pasadena Calif So Pasadena Calif Mamaroneck Microdot Inc Sealectro Corp Code No 98376 98731 98734 98821 98978 99109 99313 99378 99515 99707 99800 99848 99934 99942 99957 Section VI Table 6 3 Manufacturer Address Zero Mfg Co Burbank Calif General Mills Inc Electronics Div Minneapolis Minn Paeco Div of Hewlett Packard Co Palo Alto Calif North Hills Electronics Inc Glen Cove N Y International Electronic Research Corp Burbank Calif Columbia Technical Corp New York N Y Varian Associates Palo Alto Calif Atlee Corp Winchester Mass Marshal Ind Elect Products Div San Marino Calif Control Switch Division Controls Co of America El Segundo Calif Delevan Electronics Cotp East Aurora N Y Wilco Corporation indianapolis Ind Renbrandt inc Boston Mass Hoffman Etectronics Corp Semiconductor Div El
106. rmacy House 80 Jorissen Street Braamfontein Johannesburg Tel 724 4172 Telex 0026 JHB TAIWAN Hwa Sheng Electronic Co ttd 0 Box 1558 21 Nanking West Road Taipei Tel 46076 45936 48661 Cable VICTRONIX Taipei TANZANIA R j Tilbury Ltd P O Box 2754 Suite 517 518 Hotel Ambassadeur Nairobi Tel 25670 26803 68206 58196 Cable ARJAYTEE Nairobi Suite 517 518 Hotel Ambassadeur Nairobi Tei 25670 26803 68206 58196 Cable ARIAYTEE Nairobi VIETNAM Landis Brothers and Company inc P 0 Box H 3 216 Hien Vuong Saigon Tel 20 805 Cable LANBROCOMP Saigon ZAMBIA R 3 Tilbury Zambia Ltd P 0 Box 2752 Lusaka Zambia Central Africa FOR AREAS NOT LISTED CONTACT Hewlett Packard Export Marketing 3200 Hillview Ave Palo Alto California 94304 Tel 415 326 7000 TWX 910 373 1267 Cable HEWPACK Palo Alto Telex 034 8461 668 MANUAL CHANGES MICROWAVE AMPLIFIER MODEL 493A 495A Manual HP Part No 00493 90004 Make all corrections in this manual according to errata below then check the following table for your in strument serial prefix 3 digits or serial number 8 digits and make any listed change s in the manual NEW ITEM r SERIAL MAKE Prefix Number CHANGES 1 1 1 1 1 1 through 6 843 1 through 7 963 1 through 8 963 1536 1555 1 through 9 963 1556 1705 1 through 10 1144A 1706 1795 1 through 11 1231A 1
107. s shown in figure 5 7 b Set Model 493A GAIN control full clockwise Set up the signal generator for 15 dbm output at 8 gc 12 4 gc for Model 495A d Set up the widerangeoscillator for a 1 volt peak to peak output at 1 kc e Adjust the signal generator power output so that the detected 1 kc modulated signal on theoscilloscope is set to a reference level f Set up the wide range oscillator for a 1 volt peak to peak output at 500 kc The amplitude of the de tected signal should not have dropped more than 3 db 5 11 Section V Paragraphs 5 41 to 5 44 Specification Less than 3 db small signal output var iation dc to 500 kc 5 41 SWR CHECK 5 42 SWR of the rf input and output circuit is 3 1 or better and normally need not be checked if the instru ment meets gain and power output specifications 5 43 If it is desired to check the swr normal swr measuring techniques i e slotted line or swept frequency reflectometer can be employed Appli cation Note 54 available from your Engineering Representative describes new improved swept fre quency techniques for measurement of swr etc Note The dc resistance of the input and output cir cuits when measured at the panel jacks from center conductor to ground will read The 50 0 impedance is achieved through trans mission line coupling 5 12 Model 493A 495A 5 44 FREQUENCY RANGE CONVERSION a Remove the twt from the instrument see twt
108. stomer Service Center 333 Logue Avenue Mountain View California 94040 USA 01153 11 Rev 5 1 68 MICROWAVE TUBE WARRANTY CLAIM INFORMATION FORM IMPORTANT Please answer all questions fully insufficient information may delay processing of your claim DATE FROM Tube Owner Company Address Tube type Tube serial No Tube mfr Use in HP Model Instrument serial No Tube is Original or Replacement 0 Date tube received Date of failure Total hours filament operation SYMPTOMS Please describe conditions prior to and at time of failure along with description of tube s defect if known IMPORTANT Replacement new tube serial No Signature Title For HP use only Repair order 5 1 68 01153 4 HEWLETT PACKARD ff SALES AND SERVICE UNITED STATES ALABAMA 0 Box 4207 2003 Byrd Spring Road S W Huntsville 35802 Tel 205 881 4591 TWX 810 726 2204 ARIZONA 3009 North Scottsdale Road Scottsdale 85251 Tel 602 945 7601 TWX 910 950 1282 232 South Tucson Boulevard Tucson 85716 Tel 602 623 2564 TWX 910 952 1162 CALIFORNIA 3939 Lankershim Boulevard North Hollywood 91604 Tel 213 877 1282 TWX 910 499 2170 1101 Embarcadero Road Palo Alto 94303 Tel 415 327 6500 TWX 910 373 1280 2591 Carisbad Avenue Sacramento 95821 Tel 916 482 1463 TWX 910 367 2092 1055 Shaft
109. tage from 103 to 127 vac The 350 volts should not vary more than 3 volts 350 volt supply ripple voltage should be less than 10 millivolts d Connect dc voltmeter between pin 12 of A400 and ground Place the dc voltmeter on the 4300 volt range and check 300 volts Meter should read 300 volts 10 volts If not within the tolerance Specified check and Then if still out of specificatioa replace R38 and R39 Refer to para 5 28 Gain Limit Adjustment 5 28 GAIN LIMIT ADJUSTMENT a Parallel an ac and a dc voltmeter connect be tween grid terminal EID and EIE figure 5 3 b Rotate GAIN control full clockwise Adjust gain limit control R418 to voltage value stamped on twt capsule d Vary power line voltage from 103 to 127 vac Grid voltage should not vary more than 1 5 volts ripple voltage should be less than 10 millivolts 5 29 0PTIMIZING TWT ELEMENT VOLTAGES TO OBTAIN PROPER POWER AMPLIFICATION 5 30 When all twt element voltages have been set it may be necessary to go back and optimize the col lector helix anode and grid voltages to obtain the desired power amplification Set up the Model 493A as shown in figure 5 5 5 8 b Set up the signal generator for a 1 milliwatt put at twt low power point 8 0 gc for 493A 12 4 gc for 495A Note Make sure that the 1 milliwatt signal gener ator output includes the attenuation produced by the coaxial cable and that thelosses
110. uipment Required The table includes the type of equipment to be used the critical specifications required for testing where test equipment is used and recom mended commerically available test equipment used in the calibration of the instrument 5 12 TROUBLESHOOTING PROCEDURE 5 13 The troubleshooting procedure localizes trou bles to a section twt high voltage power supply or modulator Troubles that usually arise affect power amplification or modulation The following procedure lists checks to be made voltage limits and ref erences to adjustment procedures Voltage limits for collector helix anode and grid refer to values stamped on the twt capsule If a voltage cannot be adjusted within the limits given use the troubleshooting chart figure 5 2 as a guide to isolate the cause of trouble CAUTION Do not operate instrument without fan duct and covers for long periods of time Cover is needed to maintain ambient temperature of the instrument below 35 a TWT filament voltage 6 2 40 1 volts para 5 24 c Collector helix voltage x 1075 para 5 25 c Anode voltage 10 para 5 26 d Grid voltage 1 volt para 5 28 check 1 350 volts 2 volts applied to modulator 2 300 volts 10 volts applied to modulator 3 R418 gain limit adj 4 Current sink Q401 e Frequency response and bandwidth of modulator paragraphs 5 32 and 5 33 f V403 and V404 Note Any change in collector helix voltag
111. ulator board b Before installing new TWT adjust filament volt age to value stamped on TWT capsule with a 5 ohm 5 watt load across filament circuit see paragraph 5 24 FILAMENT ADJUSTMENT Rough set 350 volt sup ply measured between C401 and R431 and ground collector helix voltage anode and grid voltage as in structed in paragraph 5 24 through 5 27 c Remove modulator board d Install TWT e Re attach the El board to the instrument wall Connect the TWT leads to terminal board El f Connect jumper wire between EIC grey filament lead and white cathode lead on the El board All replacement tubes require the jumper between E1C and E1E Connect the TWT lead to terminal board E1 as shown in table 5 2 and figure 5 3 g Ifthereplacement tube is supplied with detachable input and output cables remove the cables from the tube to avoid disassembling the type N panel con nectors If the cables are not detachable disassemble the type N connectors to mount them in the panel h Repeat stepfwiththe TWT input cable connector i Replace modulator board j Refer to paragraph 5 29 for optimizing TWT el ement voltages to obtain proper power amplification Note The new modulator board Stock No 495 65D can be used with the old type TWT Stock No 1952 0016 if diode CR405 Stock No 1901 0029 is installed between pin 1 of 404 and 6 of 404 Replace top and bottom cover Table 5 2
112. waukee Wis Chicago 11 New York N Y Providence R I Chicago Ill Commerciai Plastics Cornish Wite Co The Cota Coil Co Inc Chicago Miniature Lamp Works A O Smith Corp Crowley Div West Orange N J 71785 Cinch Mfg Co Howard B Jones Div Chicago Ill 71984 Dow Corning Corp Midland Mich 72136 Electro Motive Mfg Co Inc Willimantic Conn 72354 John E Fast Co Div Victoreen Instr Co Chicago Ill 72619 Diatight Corp Brooklyn N Y 77656 Indiana General Corp Electronics Div Keasby N J 72699 Genetal Instrument Corp Div Newark 3 72765 Drake Mfg Co Chicago Ht 72825 Hugh H Eby Inc Philadelphia Pa 72928 Gudeman Co Chicago ML 09015 42 Revised July 1966 6 12 Code No 72964 72982 73061 73076 73138 13293 1345 73506 73559 73682 73734 73743 13193 73846 13899 13995 74276 74455 74861 74858 74970 15042 75378 15382 75818 5815 76005 76210 78487 76493 76530 76545 76703 76854 11068 77075 77221 77252 77342 77630 77638 11164 77969 78189 78283 78290 78452 78471 78488 78493 78553 78790 78947 79136 79142 79251 79727 79963 TABLE 6 3 Monufacturer Address Robert M Hadley Co Los Angeles Calif Erie Technological Products Inc Erie Pa Hansen Mfg Co Inc Princeton Ind Harper Co Chicago Il Helipot Div of Beckman Inst Inc Fullerton Calit Hughes Products Division of
113. wt supplied with the microwave amplifier and replacement twt s purchased from Hewlett Packard Company are guaranteed against electrical failure for a specified period either period of time from date of purchase or number of hours of instru ment operation For information regarding warranty contact your local Hewlett Packard field office A sheet for your use is included in the appendix of this manual 1 1 Model 4934 495 Section Paragraphs 2 1 to 2 8 SECTION Hi INSTALLATION 2 1 AIR FILTER 2 2 This instrument is equipped with a renewable type air filter When first unpacking and placing the instrument into service the filter must be coated with dirt gathering adhesive to make it effective While light machine oil is satisfactory we recommend a water soluble adhesive such as Super Filter Coat manufactured by Research Products Corporation of Madison 1 Wisconsin 2 3 MECHANICAL INSPECTION 2 4 Unpack the instrument upon receipt and inspect it for signs of physical damage such as scratched panel surfaces broken knobs etc The Model 493A should be checked electrically Section V includes a performance check which is an in cabinet check to verify proper operation and is a good test as part of incoming inspection If there is any apparent damage file a claim with the carrier and refer to the warranty page in this manual 2 5 INSTALLATION 2 6 The Model 493A is of modular design Itis shipped as a c

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