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THE HQ-170A ATION S COMMUN 1C RECEIVER

Contents

1. FOR OFAST FROM 229 7 60 KCS 9 R96 IF R20 ZERO 64 ADJ A I METER SENS L7 8 15 IST AUDIO AMP B DETECTOR FOR AVC DELAYED AVC TO AVC TO 2 ND IF ANP RF AMP 3 RD MIXER8 lt ST 6OKCS IF AMP GROUND CONNECTED IN ONLY ER CIRCUITS AVC 8 S AUTO RESPONSE FEEDBACK ew LOOP GND AUTO RESPONSE CIRCUIT Wi EH 17 AUDIO CHARACTERISTIC A AF GAIN CONTROL GAIN APPROX 25 OF ROTATION FROM MIN SIMU LATING AVERAGE SETTING A INPUT ACROSS AF GAIN CONTROL CONSTANT B INPUT 1 4V ACROSS GAIN CONTROL CONSTANT ze bel HE IU db FROM 1 CYCLES FREQUENCY IN CYCLES PER SECOND AUTO RESPONSE CURVE amplifier to the 2nd IF amplifier to the 3rd mixer and to the Ist 60 KCS IF amplifier The positive voltage developed across R92 prevents AVC from being applied to the RF amplifier until the incoming signal is high enough to overcome it This delayed AVC improves the reception of weak signals The other AVC circuit is not biased in this fashion but it is designed to allow for an adjustable decay characteristic AVC is applied immediately but its decay in the event of fading is adjustable to be slow medium or fast depending on the type of signal and on the atmospheric conditions of the time R83 R84 and R85 set the dis charge time of C131
2. 25 1123135 qNV8 330 NO I 01 4 19 1 4 9 VSIA ONINOL 929 92 SN3S WIHL U3INUJA 0344 INV G O l die 24 250 a SONV8 SOWb S ONY 5242 81 POSIZIA 9289 NO JI SSP SdWV 3l H3XIW 431114 31 H3XIW HIXIW 2409 01 QUIHL 1015 SSb QNO23S isul4 9389 SA 9789 v 9389 9389 ZA 9789 N tube bias permitting increased amplification and thereby increasing sensitivity to weaker signals From the RF amplifier the signal is applied to the first mixer where it is heterodyned with the output of a separate high frequency oscillator The resulting frequency is the first intermediate frequency IF Band switching and frequency tuning occurs in the grids of the mixer and of the oscillator The arrangement of heterodyning used in this Receiver is listed in the accompanying chart The stability of the oscillator circuit a must for accurate and repeatable tuning is maintained by using a separate tube and keeping the heater supply on at all times minimizing drift tendencies The filament is supplied with power through filament transformer T30 as long as the line cord is connected to a source of power If the clock is mounted power will be required at all times The chart of the heterodyning scheme shows that the second mixer becomes a 455 KCS amplifier on the two lowest frequency
3. 2 21 72 PARTS LIST HQ 170A DESCRIPTION Output Transformer Filament Transformer for 50 60 Cycles 115V Operation Filament Transformer for 50 60 Cycles 115 230V Operation Tube Electron 6BZ6 Tube Electron 6BE6 Tube Electron 6846 Tube Electron 6BV8 Tube Electron 12AU7 Tube Electron 6AL5 Tube Electron 6C4 Tube Electron OB2 Tube Electron 6AV6 Tube Electron 6AQ5 Crystal 2580KC Crystal 100 RC Printed Network RC Printed Network PART K38828 2 K39224 1 K39224 2 K16388 1 16284 1 16283 1 16396 1 16295 1 16294 1 16288 1 16375 1 16392 1 16387 1 38972 2 38661 1 38981 1 38846 1 71 MISCELLANEOUS PARTS DESCRIPTION Snap Button Sems Fastener 10 32 x 5 8 Lg Metal Washer 13 64 1 D x 13 32 O D x 040 Thk Instruction Book Steel Cable Assy Tension Spring for Steel Cable Assy Knob 1 Dia with No Mark Knob 1 Dia with White Mark Knob 2 Dia Knob Pointer Type Knob Bar Knob 3 4 Dia Pointer Large Pointer Window Assy Window Assy Retainer Spring Window Assy Tension Spring OPTIONAL ACCESSORIES DESCRIPTION 24 Hour 115 60 Telechron Clock Assembly Conversion Kit 24 Hour 115 230 50 w Telechron Clock Assembly Conversion Kit 24 Hour 115 230V 60 w Telechron Clock Assembly Conversion Kit Loudspeaker Assembly Model 200 in Cabinet Matched to the Models HQ 170A and HQ 180A
4. 4 7 MMF N750 C67 C69 Dur Mica DM 15 62 MMF 296 500V C71 Dur Mica 15 243 MMF 5 300V PART NO M23034 13 K23006 8 M23034 18 K23045 3 K23045 2 K23038 5 K34454 G24 K23043 5 K23043 6 K23006 48 K23008 2 K23057 1 K23010 6 K23006 10 K23006 27 63 PARTS LIST HQ 170A SCHEMATIC DESIGNATION DESCRIPTION PART NO CAPACITORS cont d C C Temp Comp K23010 26 27 MMF N470 C73 Temp Comp K2301 0 23 20 MMF N470 C75 C140 Dur Mica DM 15 K23006 94 12 MMF 596 500V C77 C78 C143 C144 Dur Mica DM 15 K23006 47 47 MMF 5 300 C79 Temp Comp K23010 13 618 MMF N470 C80 Temp Comp K23010 8 N470 4 7 MMF 1000V C82 Electrolytic K15504 71 60 40 40 40 C82A 60 MFD 400V Part of C82 82 40 MFD 400V 4 Port of 82 C82C 40 MFD 350V Port of C82 C82D 40 MFD 25V Port of C82 C83 C84 Disc Ceromic M23034 26 01 MFD GMV 1400V C85 Dur Paper K23045 5 1 MFD 20 600V C86 C94 Dur Mica DM 15 K23006 15 31 MMF 500V C88 C90 C96 C98 Dur Mica DM 15 K23006 16 29 MMF 500V C91 C99 Dur Mica DM 15 K23006 19 28 MMF 500V C92 6100 Dur Mica DM 15 K23006 20 27 MMF 500V G 64 PARTS LIST HQ 170A SCHEMATIC DESCRIPTION DESCRIPTION CAPACITORS cont d C104 C110 C115 C117 Dur Mica DM 15 122 7 MMF 500V C106 Dur Mica DM 15 10 MMF 500V C107 C116 Dur Mica DM 15 14 MMF 500V C108 C119 Dur Mica DM 15 21 MMF 500V
5. NOTE INDICATES TERMINAL LOCATINC LUG ALL RESISTORS 2 t 10 UNLESS OTHERWISE SPECIFIED ALL CAPACITORS MICRO MICROFARADS UNLESS OTHERWISE SPECIFIED SLOT FREQ L3 COARSE ADJ 455 KC C26 FINE ADJ ON FRONT PANEL VERNIER TUNING L4 COARSE ADJ 395 KC C 30 FINE ADJ ON TSIDEBAND FRONT PANEL POS KNOB POS ME LOWER LFALIGNED AT 60 KC WITH I 2 UPPER 55 IN SKC POS AND 56 N POS 3 BOTH SHOWN IN UPPER POS PANEL KNOB INDICATES LOWER POS NOTE SCHEMATIC DIAGRAM HQ 170A BLK GRN BLK RED INS OF EXPORT VERSION 3RD MIXER KC LF AMP V5 6BE6 Ves T 6 6BA6 5 SHOWN IN SEND POSITION 143 47 vi2 6 4 4 OSC RSI ciga T 4 7470 47 gt 91 j 240 via 082 VOLTAGE REGULATOR R20 ZERO 47 DIAL LAMPS 300 ADJUST vi v4 v5 v6 vs V9 VIO vll VI3 vis R22 1 6 6 1 820 5 2700 00 i SENSITIVITY 5 ADJUST v2 vi2 BLK lt BIK VEL BLK GRN OIUF a BLK RED HS CONNECTIONS OF EXPORT VERSION 230V CONNECTIONS OF EXPORT IST MIXER 2 6 6 quu c52 ci58 3 25 14 ANT TRIMMER 2D FRONT WIRING SIDE file Cl BoatAnchors Hammarlund HQ170A HQ170SVC TXT be obtained If it is desirable to increase the headphone volume an inexpensive line to voice coil transformer is
6. Tighten the two Phillips head screws in the top of the cabinet 37 CABINET PHILLIPS OVAL HEAD SCREWS CLIP DETAIL TOP FRONT lt PANEL CLIPS 4 INSERT PRONGS me HEX HEAD SLOTTED SCREWS WITH LOCK amp FLAT WASHERS HARDWARE TO FASTEN CHASSIS TO ee ER To CABINET Removal of the Front Panel from the Chassis Refer to the diagrams for the locations and identification of all parts Step 1 Remove all knobs except those of the clock and dial calibration Turn all capacitors so that their plates are fully meshed Step 2 Remove the following Nuts from the controls shown on the diagram Nut and lock washer from the headphone jack Screws and lock washers from the capacitors Pry off the two red pointers be careful not to bend them Step 3 On the back of the front panel remove the following Large nuts and fiber washers Dial calibration drive discs S meter lamp assembly Unsolder the two wires to the meter and the three wires on the clock Pull off the other two lamp assemblies for working convenience in later steps Step 4 On the front of the panel remove Four Phillips screws and nuts One smaller Phillips screw and L bracket Hold panel to prevent it from falling as the last screw is removed This completes the removal of the front panel To replace the dial cord continue with Step 5 39 i POINTER SHAPE REMOVE ALL KNOBS EXCEPT CLO
7. 66 PART NO K23006 21 M23034 30 K23006 105 M41215 3 K15923 1 K15928 8 K15928 1 K16004 1 K16004 1 K16004 1 K16083 1 K35608 1 K41138 1 K16111 1 K41144 1 K15627 1 K42032 1 K26301 1 K42019 1 K26302 1 K15629 1 K15629 2 K261 49 5 PARTS LIST HQ 170A SCHEMATIC DESIGNATION DESCRIPTION RESISTORS RI R30 R32 R37 R46 470K 10 1 2W R76 R82 R85 R93 R99 R2 R13 R27 R40 R51 R74 100 10 1 2W R3 R4 10 10 1 2W R5 R14 18005596 1 2W R Variable 1 5K Dual With R15 and 53 RF Sens R7 R29 22K 10 1 2W R8 R98 160 596 1 2W R9 R12 R16 RI7 R47 10 1 2W R52 R62 R97 RIO R42 R49 R65 R70 47K 10 1 2W R72 R73 R75 R84 RI 4 3K 5 1 2W RI5 Variable 10K RF Sens R18 R103 100K 10 1W R19 Variable 1 5K Sens Adj R20 Variable 300 Zero Adj R21 22K 10 1W R22 820 5595 1 2W R23 R41 R95 1096 1 2W 402252252222 1208596 R25 39n 5 1 2W PART NO K19309 113 K19309 97 K19309 1 K19309 260 K38940 1 K19309 81 K19309 199 K19309 49 K19309 89 K19309 213 Part of R K19310 97 K15379 2 K15379 1 K19310 81 K19309 266 K19309 73 Spe I MN K19309 253 67 PARTS LIST HQ 170A SCHEMATIC DESIGNATION DESCRIPTION RESISTORS cont d R26 Variable 200 A Slot Depth R28 R43 R45 R48 R68 R71 220K 10 1 2W R31 R33 68n 10 1 2W R34 5
8. C112 C121 Dur Mica DM 15 16 MMF 500V C125 Dur Mica DM 15 47 MMF 1090 500V C126 C127 Mylar 01 MFD 10 400V C129 Variable 98 5 MMF BFO C132 Disc Ceramic 005 MFD GMV 1000V C134 Dur Mica DM 15 2 MMF 5 MMF 500V C135 Disc Ceramic 8 MMF 20 1000V C138 Temp Comp N750 47 MMF 500V C139 Capacitor Temp Comp 10 MMF N470 C142 12 MMF N470 C147 Electrolytic 20 MFD 25V PART NO K23006 24 K23006 22 K23006 25 23006 26 23006 23 23006 6 K23044 2 K42042 1 M23034 10 K23006 37 M23034 11 K23061 26J K23010 45 K23010 10 M23091 1 65 PARTS LIST HQ 170A SCHEMATIC DESIGNATION DESCRIPTION CAPACITORS cont d C102 C109 6118 6148 Dur MICA DM 15 C149 150 9 MMF 5 MMF 500V C151 C154 C155 15 Disc Ceromic 001 MFD GMV 500V C153 Dur Mica DM 15 47 MMF 2 500V CRI CR2 Rectifier Silicon CER 72C El Fuse Holder F1 Fuse 3 Amp for 50 60 Cycles 115V Operation Fuse 1 1 2 Amp 3 AGC for 50 60 Cycles 230V Operation 1 Incandescent 47 12 Lamp Incandescent 47 I3 Lamp Incandescent 47 Socket 8 Pin 32 Phone Jack J3 Connector Female 4 Connector 45 J Connector Female LI RF Choke 2 5 MH L2 Bifilar Coil LA Passband Tuning Coil L5 L7 LIO Inductor 330 MH 16 Reactor L8 RF Choke 38 Microhenry L9 RF Choke 240 Microhenry MI Meter Signal strength
9. and there will be no trouble identifying and replacing all of the parts Note particularly the knob and dial alignment procedures 36 Removing Receiver Chassis from the Cabinet Disconnect all wires and cables at the rear of the chassis Tip the cabinet up from the front and remove the hex head screw on the bottom Remove the three hex head screws at the back of the cabinet Loosen the two Phillips head screws at the top front of the cabinet do not remove them Slide the panel and chassis forward to clear the cabinet Guide the line cord as necessary It is advisable to set the chassis down so that the panel overhangs the edge of a table This will protect the panel finish and relieve strain on the panel mounting screws Replacing Receiver Chassis in the Cabinet Slide the chassis and panel into the cabinet guiding the line cord through the rear opening as necessary Check that the L bracket under the chassis does not catch under the cabinet as the chassis is slid into it Make sure the cabinet edges are fitted into the slot around the inside edge of the panel Check that the clips fit under the panel edge as shown in the illustration Insert the three screws lock and flat washers in the back of the cabinet Do not tighten firmly yet Tip up the cabinet and insert the screw lock and flat washer in the bottom front of the cabinet Do not tighten yet Tighten the three screws in the rear first then tighten the screw on the bottom
10. control on the front panel permits the selection of OFF AVC or SLOW MEDIUM FAST AVC decay time for optimu results on various signals The AVC is taken from the high tivity 60 KCS IF S METER Readings of signal strength and on the point tuning indications are provided on all types of signals by a high response S meter circuit The scale is calibrated to 40 db over S 9 and is factory calibrated so a signal of approximately 50 microvolts reads S 9 Each S unit indicates approximately a 6 db increase equivalent to doubling the signal strength S meter is extremely effective on SSB and CW when using slow decay AVC AUDIO The HQ 170 A features the exclusive Hammarlund Auto Response which automatically adjusts the audio passband to best meet the receiving conditions A 6AQ5 provides 1 0 watts for maximum undistorted output The Auto Response circuit employs controlled feedback which is decreased at the gain con trol is turned up thus narrowing the audio passband As the gain is decreased the feedback increases thus permitting a greater frequency response in the audio output The result is crisper easier to read sound on weaker signals and broader more realistic reproduction on stronger signals The audio output may be used with either earphones or loud speaker The phone plug automatically silences the speaker upon l gt 20 4 eight tuned circuits in three stages of amplification Six tuned insertion The Audio
11. conversion depending upon the operating band IF circuits employ iron core permeability tuned transformers for the high performance and retention of alignment accuracy The 60 KCS amplifier selectivity is controlled from the front panel by seven positions 1 2 3 KCS either sideband and 5 2 4 6 m lt lt posu KCS on both sidebands The skirt selectivity of this system proaches that of the mechanical filter A separate front panel switch is used to select upper lower or both sidebands provid ing rapid simple means of sideband selection A 455 KC output jack is provided for Q multiplier or visual spectrum analyzer SLOT FILTER The slot filter provides a notch of better than 60 db attenuation over the entire range of 5 KCS from the center IF 455 KCS frequency The slot filter control provides 40 db at tenuation plus an additional attenuation of up to 20 db obtain gt able by use of the slot depth control at a particular frequency The 6 db width of the slot is approximately 1 5 KCS Accurate frequency adjustment of the slot is obtained by means of an 8 1 vernier control The slot filter circuit consists of a Bifilar T trap SEPARATE VERNIER TUNING 3 KCS vernier tuning allows extra fine passband tuning between the 455 KCS IF and the 60 KCS IF for additional selectivity and easy tuning of the desired signal I AVC An extremely fast attack delayed AVC circuit is UNE A four position
12. creating the appropriate AVC decay The carrier level S meter circuit operates on the same AVC signal just described The circuit is a bridge with the tube and R88 on one side and R21 R20 and R22 with its switched resistors on the other The meter is in the center of the bridge set to zero in the absence of a signal AVC zero When a signal is received AVC is developed the tube current changes to unbalance the bridge and the meter reads The greater the signal the greater the unbalance and the higher the meter reading The sensitivity setting is made only when a signal of known strength is applied to the receiver usually from a precise signal generator whose output level can accurately be measured The audio stages are conventional in nature except for the special auto response circuit illustrated This is a negative feedback system that provides maximum effect at low audio gain control settings Strong signals are then permitted the highest fidelity of response and lowest distortion while increasing the gain on weak signals narrows the audio response to improve signal selectivity An improved signal to noise ratio results A further advantage is the critical damping of the speaker for elimination 34 1 F of speaker resonance effects Speech reception is improved and receiver output noise is reduced The receiver power supply is arranged to permit the Ist oscillator and mixer to remain heated even when the rest
13. frequency control at or near the zero setting for normal tuning since the center of the pass band will be slotted out producing 2 spot tuning or 2 peak S meter readings After tuning the constant carrier to peak the S meter observing the above pre cautions rotate the slot frequency control It will be noticed that upon approaching the zero setting the S meter will be effected very definite null or minimum S meter reading will be obtained with the slot frequency control ad justed at or near zero With the slot frequency control set at the minimum S meter reading the slot depth control should be rotated slowly through its entire range while observing the S meter It will be found that at one particular position throughout the range of the slot depth control a further reduction in the S meter reading will be obtained A very slight readjustment of the slot frequency may now result in a further S meter reading reduction In some cases the adjustment of L3 will be required With the above steps completed and the controls left as they are take a tuning wand and rotate the slug in L3 for maximum S meter reduction Be very careful not to move the slug too fast for it should be very close to correct setting Once these settings have been obtained the slot depth control and L3 may be left permanently positioned and all future slot filter adj ustment made by the slot frequency control only A check of the slot depth is advisable periodically T
14. is especially useful for code reception where little sidebands are transmitted A wide band receiver is a detriment here because of such a receiver s capability of amplifying all nearby stations almost as well as the one to be listened to For single sideband operation a second switch permits setting the receiver passband for maximum reception only on the side of the carrier required for reception The signal delivered from the 60 KCS amplifier stages is then applied to four separate detector circuits two for efficient audio development and two for the generation of correct AVC voltages that will assure the best possible reception of all types and levels of RF signals The general block diagram shows that AM reception is handled by a normal diode detector circuit See the simplified schematic of the detector BFO and noise limiter circuits In the AM position the resulting audio is passed through the noise limiter tube V10 and on to the audio gain control In the CW position V9 acts as a product detector and the audio is developed from the beat between the incoming 60 KCS and the output of the BFO at a frequency that is at or near 60 KCS depending on the setting of the BFO control The BFO is aligned so that zero beat occurs when the BFO control is centered The audio output is then taken from the junction of R73 and R74 and applied through the CW position of the mode switch to VIO in the same manner as for the AM audio Single sideband detec
15. it should be noted that proper tools and test equipment must be available to undertake the electrical alignment Inadequate or inaccurate test equipment may result in generally poor operating results Excessive oscillator drift which is most noticeable on all of the high frequency bands plus a microphonic condition is usually the result of a poor 6C4 V12 high frequency oscillator This tube is also capable of producing a poor beat note with a ripple in it also especially noticeable on the high bands Excessive drift can also be attributed to a poor 6BE6 V2 This tube can also cause hum modulation most evident on the two highest frequency bands Sometimes interchanging the 6BE s between V2 and V3 can produce a noticeable improvement Normally there is no reason to remove the chassis from the cabinet because the top cover allows access to all of the tubes and to the clock adjustment However in the case of RF and IF alignment it will be necessary to take the chassis out to gain access to the under chassis alignment settings Further disassembly is not recommended except in the case of dial cord replace ment As this is a steel cable breakage is unlikely but if it should it will be required to remove the front panel from the chassis and to remove the two calibrated dials The instructions for the removal of the chassis from the cabinet and for the disassembly of the front panel are presented here Follow the instruction steps with care
16. of the set is turned off As has been previously mentioned this to provide increased receiver stability The schematic diagram shows these tubes heated separate filament transformer connected to the power line through only the fuse The electric clock timer is also connected to the line in the same manner The timer switch mechanism is in series with the normal on off switch so that the set Ta be turned on automaticallv at anv desired time The timer mechanism is designed that it must be turned off manually to reset the mechanism for automatic turn on in the next 24 hour period Plate voltage regulation is enhanced through the use of silicon rectifiers and further stabilitv is established with a gas regulator tube for the critical RF stages and for the calibrated 5 meter Except for the power transformer primary connections the supply circuitry for the export version is the same Finally there are the accessory and system sockets and the send receive _ switch each clearly illustrated on the schematic diagram and self explanatory In the send position the B to the RF amplifier the 2nd mixer and the 2nd IF amplifier is removed muting the receiver Further or alternate muting can be applied through the system socket from the transmitter 35 HQ 170 A SERVICE AND MAINTENANCE This section will provide the instructions for the correct servicing of the Receiver While no particularly unusual pr cedures are called for
17. points permitting a number of important system connections to be permanently attached in a neat manner The illustrations on the next pages show you all of them allowing you full freedom to use those that are most useful to you whether you are only listening or are operating with a transmitter The 455 KCS output the Accessory and System sockets are all for special applications associated with reception but not necessary for ordinary operation The speaker and antenna connections are required in any case 455KC IF OUTPUT FOR PANORAMIC ADAPTORS OR FOR IF CONVERTERS FOR RTTY Q o SENSITIVITY ZERO O D O so aans 0 A S METER ADJUSTMENTS H F ANTENNA CONNECTIONS COAX CONNECTOR FOR COAX CABLE USE TERMINALS FOR TWIN LEAD USE ACCESSORY SOCKET 3 2 OHM POWER B h WELT FIL GND 6 METER VHF ANTENNA CONNECTIONS PHONO TYPE COAX CONNECTOR FOR COAX CABLE TERMINAL STRIP FOR 75 OR 300 OHM TWIN LEAD EXTERNAL GROUND RECEIVER REAR CONNECTIONS CC SYSTEM SOCKET FOR TRANSMITTER RELAY AND RECEIVER MUTING TN POWER Connect a suitable 3 2 ohm loudspeaker to the 3 2 terminal screws as shown in the diagram Use a Hammarlund 5 200 Speaker for best results but any equivalent speaker in a cabinet will operate satisfactorily Do not place the speaker cabinet on top of the Receiver because the HQ 170 A is a very sen
18. required as the alignment progresses Except where noted in the diagrams the coil slugs are set from the top of the Be careful that vou are actuallv tuming the proper slug it is sometimes easv to be adjusting the wrong one or even to be turning both at once if thev happen to be close together inside the coil IF ALIGNMENT Step Connect the VTVM as required in the illustration Connect the Signal Generator for the 60 KCS First Adjustments Applv an unmodulated 60 KCS and set T6 7 18 T9 110 and T11 for a peak reading Remember to reduce the IF input signal level as necessary to maintain about 5 volts 51 SET DIAL CALIBRATION TO CENTER MARK COUNTERCLOCKWISE m SET TO 14 14 4 MSC BAND iN ITIALLY SET PLATES TO TO BE ADJUSTED 1 2 MESH AS INSTRUCTED CONTROL SETTING AT START OF ALIGNMENT OL 59315 SLNSWLSNFGV 51 8 0 023565 LSHis SISSVHO 30 p mis SIN3MiSnrav 59015 WOLLO8 135 59115 WOL108 HO3 524 960 SLNIOd 3WVS 01 IVN9IS SIA 6606 59 5 WOLLO8 SLNAaWLSNrAY QNOO3S TINVA 901 3 59 55 wpe SISSVHO JO lt NO 30ISNI sissy ONY ZA 40 2 14 OL TVN9IS SIA 55 0383 1018 ANO 9015 401 250 GUE SIA S6E 59015 401 SOM 09 SISSVHO 30 3Gdi H30Nn NO dO N334138 WALA 20 90 SLIOA G NI
19. series of receivers 72 PART NO K29619 9 K10004 60 K10007 243 K52757 2 K26339 G1 K38895 1 K26224 2 K26224 1 K26226 1 K26229 1 K26243 1 K26216 3 K42043 2 K42043 1 M26300 G2 K26273 1 K26318 1 PART NO PL 26380 G2 PL 26380 G3 PL 26380 G4 PL 26394 1 5 YELLOW BLACK BLACK WHITE I RED BLACK SE SOLDERED BLACK BLACK GREEN 25 TRANS ii A C NER DOTTED LINE INDICATES PRE REMOVE WHEN INSTALLING CLOCK WIRES BLACK WHITE YELLOW BLACK LINE CLOCK INSTALLATION HQ 170A 8 HQ 180A 15 50 OR 60 SENT CONNECTION 73 YELLOW BLACK E RESISTOR 4400 20wt595 SEE NOTE 1 BLACK WHITE Ld THESE POINTS MUST RED BLACK BE SOLDERED BLACK RED BLACK GREEN K E POWER TRANS A DOTTED LINE INDICATES PRE SENT CONNECTION REMOVE WHEN INSTALLING CLOCK WIRES SLACK WHITE YELLOW BLACK NOTE THE 4400 4 RESISTOR A C LINE MUST BE JUMPED OR SHORT CIRCUITED FOR 115 117 VOLT OPERATION CLOCK INSTALLATION HQ I70A 8 HQ 180A 230V 50 OR 60 rama puma Ytp AA OND GOKC LF AMP AVC AM DET PRODUCT NOISE LIMITER 47 60 V8 6BV8 V7 6BA6 39 92 zu A 00050 NOISE LIMITER FFR 291 2 i li 8205 00
20. 1 47 01 MFD 480 2095 600V C124 C130 C133 141 145 146 C3 C8 Temp Comp K23010 5 N750 110 MMF 1000V C12 C33 C36 C38 C40 Disc Ceramic M23034 9 C46 C136 C137 02 MFD 80 2095 600V C13 89 C97 C111 C113 Dur Mica DM 15 K23006 17 C120 C123 20 MMF 5 MMF 500 V C14 Dur Mica DM 19 K23027 6 560 MMF 5 500V o C16 C28 C93 C101 C103 Dur mica DM 15 K23006 18 C114 3 5MMF 500 C19 C20 Disc Ceramic M23034 12 04 MFD 80 20 600V C22 C27 Disc Ceramic M23034 25 01 MFD 410 1000V C29 Dur Mica DM 15 K23006 39 780 MMF 5 300V C30 Variable Pass Band K42040 2 C31 C51 Dur Mica DM 15 K23006 1 100 MMF 1096 500V C34 C37 Dur Mica DM 15 K23006 7 24 MMF 10 500V C35 Temp Comp K23010 9 N750 330 MMF 1000V 62 ial TS j Ur ear PARTS LIST HQ 170A SCHEMATIC DESIGNATION DESCRIPTION CAPACITORS cont d C39 C42 Disc Ceramic 0005 MFD 410 1000V C43 6152 Dur Mica DM 15 10 MMF 10 500V C44 C45 Disc Ceramic 002 MFD GM V 1000V C48 C87 C131 Dur Paper 1 MFD 20 200V C49 C95 C105 Dur Paper 047 MFD 20 400V C50 Var Trimmer 8 50 MMF N750 C52 Assy C53 C54 Mica Trimmer 3 35 MMF C55 C56 C57 C58 C59 Mica Trimmer 1 15 20 MMF C61 Dur Mica DM 15 24 MMF 5 MMF 500V C62 C63 C68 C70 C74 Trimmer 1 8 MMF C64 C65 Rotary Trimmer 1 5 9 1 MMF 666
21. 60 10 1 2W R35 1096 1W R39 i 820 1096 1 2W R44 R102 1 10 1 2W R53 3K 1096 10W R54 680 10 1 2W R55 5 1 2W R56 15K 10 1 2W R57 6 8K 10 1 2W R58 27K 10 2W R59 R63 R69 2 2K 10 1 2W 860 R61 R 6 R67 330K 10 1 2W R64 270 1096 1 2W R77 27 1006 1 2W R78 Variable 500K Noise Limiter Includes 51 R79 Variable 1 MEG Audio Gain R80 I 180 1096 1 2W RBI 1 5K 10 1W 68 PART NO K15368 7 K19309 105 K19309 21 K19309 43 K19310 49 K19309 47 K19309 121 K19337 2 K19309 45 K19309 212 K19309 77 K19309 69 K19304 52 K19309 57 K19309 109 K19309 35 K19309 11 K15378 3 K26218 3 K19309 31 K19310 53 e SCHEMATIC DESIGNATION R83 R8 R87 R88 R89 R90 R91 R92 R94 R96 R100 R101 PARTS LIST HQ 170A DESCRIPTION RESISTORS cont d 4 7 MEG 10 1 2W 430 596 JW 470A 1096 1 2W 2 7K 596 1 2W 3 6K 5 1 2W 6 2K 5 1 2W 11K 596 1 2W 5 6K 10 1 2W 68 596 1 2W 4 7K 10 1 2W 22 1096 1W 2 2 MEG 10 1 2W Switch SPDT Noise Limiter Switch Wafer Ant Primary Switch Wafer Ant Sec RF Sec Switch Wafer RF Tap Switch Wafer Osc HF Osc Tank HF Osc Top Switch SPST On Off Line Switch Send Rec Calibrate Switch Selectivity Switch Sideband Switch AM SSB CW Switch AVC PART NO K19309 137 K19310 212 19309 41 19309 272 19309 1
22. 6826 Crystal Calibrator Semiconductor Complement Rectifier Two 800 P I V at 1 2 amp Power Supply 105 125 Volts 50 60 cps a c power consumption 120 watts S Meter Calibrated 1 to 9 in steps approximately 6 db Also includes db scale above 5 9 to plus 40 db Meter deflects on all types of signals Noise Limiter Adjustable series type provides both positive and negative clipping Function Switch AM SSB CW Slot Freq Calib Slot Depth CW Tone BFO Pitch Noise Limiter adjustable on off switch ANC off slow medium fast Send Recei ve Calibrate Phone Jack S Meter Dial Scale reset Front Panel Equipment Main Tuning Vernier or Bandpass Tuning Sensitivity RF Gain on off switch Selectivity 0 5 1 2 3 Kes per sideband Sideband Upper lower both Audio Gain Antenna Compensator Tuning Range Band Selector Rear Panel Equipment Terminals for speaker connections 3 2 ohm for voice coil 500 ohm for line or VOX Accessory socket for preamp Q multiplier or converter System socket for simplified associated transmitter receiver control Phono type coax fitting 455 KC output for Q multiplier or other use S meter controls Antenna input terminals plus SO239 for HF input and phono type coax input for 6 meter antenna or converter unit Dimensions 10 1 2 Hx 19 W x 13 D Wt 38 Ibs Shipping Wt 45 Ibs 24 HOUR CLOCK TIMER Combination clock and automatic timer Aids in mee
23. 79 19309 176 19309 215 19309 67 19309 256 19309 65 19310 9 19309 129 Port of 78 K38952 1 K38952 2 K38952 3 M39073 1 Part of R6 and R15 K26306 1 M26296 1 M26303 1 K39225 1 K26309 2 69 PARTS LIST HQ 170A SCHEMATIC DESIGNATION DESCRIPTION T T2 IF Transformer 3035 amp 455KC T3 IF Transformer 455 KC 4 5 IF Transformer 455 KC 17 T8 T9 TIO TII 60 KC Coil Assy T12 Antenna Coil Assy Band 1 T13 Antenna Coil Assy Band 2 114 Antenna Coil Assy Band 3 TIS Antenna Coil Assv Band 4 116 Antenno Coil Assy Band 5 T17 Antenna Coil Assy Bond 118 Antenna Coil Band 7 TI9 RF Coil Assv Bands l 8 2 120 RF Coil Assy Bands 3 amp 4 T21 RF Coil Assy Bands 5 amp 6 T22 RF Coil Band 7 T23 Osc Coil Assy Bands 1 amp 2 124 Ose Coil Assy Bands 3 8 4 125 Osc Coil Assy Bands 5 amp 6 16 Oscillator Coil Band 7 127 Power Tronsformer for 50 60 Cycles 115V Operation 127 Power Transformer for 50 60 Cycles 115 230V Operation 128 60 KC Coil Assy 70 PART NO M26402 2 K38829 2 K38946 1 M42005 1 K38926 1 K38927 1 K38928 1 K38929 1 K38930 1 K38931 1 K26338 1 K38932 1 K38933 1 K38934 1 K38944 2 K38935 2 K38936 2 K38937 2 K38945 3 K26305 3 K26305 4 M42005 4 SCHEMATIC DESIGNATION T29 T30 130 VI VII V2 V3 V5 V4 V6 V7 V8 V9 V13 10 V12 V14 V15 VI6
24. AL CABLE TWIN LEAD FOR 50 OHM FOR DIPOLE ANTENNA ANTENNA CONNECTION TO GOOD NOTE WHEN GOAX15 d a pex USED LINK MUST BE USE EITHER ERNALb OUND 6M LINK CLOSED CLOSED BETWEEN A OR BALANCE ANTENNA IS EMPLOYED A A G 6M D 2 UQ x POLE ANTENNA CONNECTIONS FOR DI ANTENNA ANTENNIS B 6M BAND FED FROM LOW FREQUENCY 300 OHM CABLE COAXIAL FOR 6M BEAM CABLE FOR 6M BEAM USE LOW FREQUENCY EITHER ANTENNA amp GROUND AS BEFORE ANTENNA CONNECTIONS FOR SEPARATE ANTENNA x 1 STRIP INSULATION 2 CUT AND SPREAD SHIELD gt 2 3 INSERT CABLE INTO PLUG CENTER CONDUCTOR THRU JE I 5 PIN SOLDER CENTER Dei CONDUCTOR CUT OFF 4 4 45 8 EXCESS 4 SOLDER SHIELD AROUND 4 OUTER NECK OF BODY Sea A SOLDER t WIRE END CAUTION DO NOT USE TOO MUCH HEAT CENTER CONDUCTOR INSULATION MELTS EASILY ATTACHING SHIELDED CABLE TO PHONO TYPE CONNECTOR ASSEMBLY OF CABLES TO 83 15 PLUG USING ADAPTER 83 168 OR 83 185 CUT END OF CABLE EVEN REMOVE VINYL JACKET 3 4 SLIDE COUPLING RING AND ADAPTER ON CABLE FAN BRAID SLIGHTLY AND FOLD BACK AS SHOWN idit dr aaa POSITION ADAPTER TO DIMENSION SHOWN PRESS BRAID DOWN OVER BODY OF ADAPTER AND TRIM TO 3 8 BARE 5 8 OF CONDUCTOR TIN EXPOSED CENTER CONDUCTOR SCREW PLUG SUB
25. ASSEMBLY ON ADAPTER SOLDER BRAID TO SHELL THROUGH SOLDER HOLES USE ENOUGH HEAT CREATE BOND OF BRAID TO SHELL SOLDER CONDUCTOR TO CONTAC FOR FINAL ASSEMBLY SCREW COUPLING RING PLUG SUB ASSEMBLY ASSEMBLY OF CABLES 83 ISP PLUG CUT END OF CABLE EVEN REMOVE VINYL JACKET 1 8 BARE 5 8 OF CENTER CONDUCTOR TRIM BRAIDED SHIELD SLIDE COUPLING RING ON CABLE TIN EXPOSED CENTER CONDUCTOR AND BRAID SCREW THE PLUG SUB ASSEMBLY ON CABLE SOLDER ASSEMBLY TO BRAID THROUGH SOLDER HOLES USE ENOUGH HEAT CREATE BOND OF BRAID TO SHELL SOLDER CENTER CONDUCTOR TO CONTACT n m i FOR FINAL ASSEMBLY SCREW COUPLING RING ON PLUG gt SUB ASSEMBLY The 455 KCS shielded pin plug connection is intended to be used as an output feed to such equipment as a panoramic adapter providing visual indications of stations transmitting across the band or to feed an IF converter for Radioteletype reception RTTY The specific instructions for these units will appear in their manuals Regular operation usually does not demand extended use in the 6 or 2 meter bands For the 6 meter band an external preamplifier will often improve reception especially if the Receiver is used in a remote area Two meter reception with the HQ 170 A will require a converter whose oscillator frequency is such as to result in an IF in the 6 meter band The converter output is fed into the 6 meter antenna input
26. CK AND DIAL CALIBRATION ROUND NO MARKS ALL OTHERS ROUND WITH WHITE MARKS DIAL CALIBRATION KNOB POINTER SHAPE LARGE BAR LARGE ROUND ROUND STEP CORSO een e pos ee en e PRY OFF TWO SCREWS AND POINTERS LOCK WASHERS NUT AND FLAT WASHER REMOVE NUTS SCREWS AND WASHERS INDICATED X SET SCREW OF KNOBS TO LINE UP WITH FLATS ON SHAFTS CAUTION TO PREVENT DAMAGE TO CAPACITOR PLATES MAKE SURE THEY ARE FULLY MESHED STEP 2 SEE NOTE 4 43 15 SONIS 1VN3831NI 34V 3S3H1 SLNN 3AOW34 JON 00 SH3010HdWV1 YSHLO 330 hd 3SN3IN3ANOS 034 210 SV 483010SNn ONY 3AOW3 X WACIOSNN S3MIM Bic LHM 98 18 JAIXO OU Sg Vis 71 nN JUNE O Avionals xz vz HAQIOSNA s 5 S3YIM 32070 mr Tro rz 9 p LHM 2 er 6 WN3SSV 3 0W34 N 18 8 713A SH3HSVM 38814 WJ3HSVM201 ONY LOAN SLOAN 3AOW34 2 A18W3SSV lt X18 T 2724 r M oo PHILLIPS PHILLIPS SCREWS AND SCREWS AND NUT WITH NUT WITH CAPTIVE CAPTIVE LOCKWASHER LOC KWASHER PHILLIPS SCREW AND L BRACKET REMOVE SCR
27. CLOCKWISE EXCEPT WHERE NOTED AF FULLY COUNTERCLOCKWISE ANTENNA DISCONNECTED SIDEBAND BOTH POSITIONS SELECTIVITY 3 KC SEND REC RECEIVE ON CALIBRATE WHERE NOTED CAL 23 CAL 4 0 6 3 V AC NOTES DIODES 2 5 VAC INPUT 300 V DC OUTPUT LINE VOLTAGE 119 V AC VOLTAGE MEASUREMENTS MADE WITH VTVM HP 410B OR EQUAL FROM TUBE PIN TO CHASSIS VII TUBE SOCKETS AND LOCATIONS ARE SHOWN 68z6 IN BOTTOM VIEW 100 TUBE SOCKET VOLTAGES SSONVISISSY 1342005 3801 40S 1573 WOLLOB 300S 03W NI NMOHS 38V 5 01 201 ONY 5138208 3804 WS MO1S SISSVHD OL Nid 3801 WOHA 1vno3 HO U 2001430 BOlb dH HLIM 3OVW SININIHASVAW JINVISISIH S310N 21 XOZv 3 1323H QN 3S 24 AL1ALL2313S SNOILISOd H108 8 487 1SV3 X 00 NI Q3123NNOOSIQ VNN31NV 5002 330 351432012931N002 A110 dV 402v 4NI 0310N 3H3HM 1432 3 X 3SIM92019 A1103 Q3LON 3H3HM 955 038 330 H31IWI1 3SION 0310 383HM 1430 3 340 DAV 855 761 728 IW bbl 6l 39NVH 9NINn1 9NIL13S TOHLNOI 6079 o U 028 7 17028 WLS 45 NIN ws 081 0 NIW v oo e 7 vl FISSER gt PARTS LIST HQ 170A SCHEMATIC DESIGNATION DESCRIPTION PART NO CAPACITORS CI Assy 141604 G5 C2 C5 C6 C7 C9 C10 CIT C17 Disc Ceramic M23034 19 C21 C23 C32 C4
28. E NOTE 3 IN CASE OF SIGNAL INTER FERENCE TURN TO POINT WHERE UNWANTED CODE SIGNAL IS LEAST SEE NOTE 2 RECEPTION BAND SELECTOR KNOB TUNE FOR MAX SIGNAL LEVEL SEE NOTE 4 HEADPHONES SET TO RECEIVE IF RECEIVER IS USED ALONE IF RECEIVER IS TO BE MUTED BY TRANSMITTER RELAY CONTACTS REAR CONNECTIONS SET TO SEND DESIRED VOLUME SET TO DESIRED VOLUME BUT KEEP LOW TO AVOID OVER DRIVING RECEIVER FOR DIAL CALIBRA NOW SET MAIN VERNIER TION SET CAL TUNING TO IOOKCS TUNING BE SURE BFO AND MULTIPLE NEAREST KNOB SEQUENCE OF ADJUSTMENTS TO STATION WHERE CALIBRATION 15 DESIRED TUNE TO ZERO BEAT SEE NOTE 5 VERNIER SET 10 CHECK THAT AVC IS OFF AND AM SSB CW SWITCH IS ON LLI CW 20 DIAL CALIBRATION TO BE USED WITH CALIBRATION CRYSTAL SEE CODE RECEPTION INSTRUCTIONS CLOCK TIMER SEE AM RECEPTION FOR INSTRUCTIONS SET TO JUST BEFORE THE POINT WHERE FOR ADDED SLOT REJECTION SET AUDIO OUTPUT STARTS To DECREASE SINGLE FOR LEAST UNWANTED SIGNAL IN LEVEL E SIDEBAND RECEPTION IN CASE OF SIGNAL INTER FERENCE TURN TO POINT WHERE UNWANTED SIGNAL IS LEAST SEE NOTE 2 SET TO SLOW OR MEDIUM BAND SELECTOR KNOB TUNE FOR SIGNAL LEVEL SEE NOTE 7 MAINTAIN 3 KCS BANDWIDTH TO AS
29. EWS NUTS AND BRACKET INDICATED CAUTION HOLD PANEL TO PREVENT FALLING STEP 4 43 Step 5 Loosen but do not remove the set screws on the two dials DO NOT MOVE THE SET SCREWS OF THE PULLEYS Now pull the two dial assemblies forward at the same time guiding the left dial out of the tuning drive discs LOOSEN TWO ALLEN SET SCREWS IN EACH TOP VIEW niih EE A EE 1o U DIAL REMOVE COMPLETE DIAL ASSEMBLY AS ONE PIECE PULL FORWARD AND OUT OF DRIVE SIEP 5 I After Cable Replacement Align Dial Scale Marking with Window Fiducial Centered within the Opening SEE TEXT Note 1 Position of Pulley Shown in Extreme Clockwise Position 2 Length of Steel Cable is 46 13 32 from Eyelet Centers Spring Part No 38895 1 Steel Cable Assembly Part No 26339 61 CAUTION Do not loosen Pulley Screws During Installation of Cable DIAL CABLE ASSEMBLY STEP 6 44 1 Step 6 Follow the fiche Hans below referring to the Step illustration as needed to be sure of correct cable installation 1 Fold the dial soba half and insert the bent loop end into the small hole of the smaller pulley and loop the dial cable around the shaft 2 Wrap one half of the dial cable around the smaller pulley for 3 4 of a turn in a clockwise direction Guide this half of the cable underneath the larger pulley and wrap around the larger pulley one complete turn clockwis
30. Frequencies ore in MCS B Bottom Slug T Top Slug Does not usually require adjustment squeeze coils together to lower frequency spr raise Consult the RF alignment chassis views for the location of each of the adjustment poir the above chart 56 4 d31S 1 34 NI G3LONYLSNI SV S3I2N3n038J 3A08V OL 135 03193 0 SMNII TIV dINLS VNN31NV 01 MOIVH3N39 IVNDSIS dM 31 804 SV GSLOSNNOD WALA SISSVHD 30 dOL SLNSWLSALGV LN3NWN9ITV 1NONJ SISSVHO SOW 69015 401 L 92 301 w 571102 7250 21 SOW 59015 so 4 nonoa a or 0i ow 082 1108 3H 64 021 121 I P son 02 ow Tar eu su zu ANO 59015 40 VNN31NV HO1VH3N39 91515 4H AVNIWH31 VNN31NV 57 062 YOLVYSITVS 7IV1S AND LL Anc 555 20 4 0 7 3 14 4 21 6 300 54 0 50 MCS NS Q MCS OSC 126 mes BAND SWITCH _ FRONT MCS OSC TRIMMERS RF ALIGNMENT ADJUSTMENTS UNDER CHASSIS STEP 7 Step 8 Step 9 On the 50 54 MCS band reinserting the chassis in the cabinet causes slight shift in Receiver oscillator frequency Set the oscillator coil T26 with the Receiver tun
31. Relay League publishes this type of information Its Antenna Book provides all you need to know about antennas for Cb lt 220 ai hath sanantiza e bern 1 2 WAVE LENGTH LUG 50 150 FEET SINGLE WIRE ANTENNA 1 2 WAVE 468 FREQ MCS 4 1 4 p N 4 1 4 COAX PLUG 75 OHM TWIN LEAD USE 300 OHM TWIN LEAD FOR FOLDED DIPOLE DIPOLE LUGS ANTENNA P TLLA a M es 4 LUGS OR CONNECTOR 6 METER BEAM ANTENNA M EO AMAT WANN TO 4 DIPOLE ANTENNA TO MOUNT ARRESTOR SINGLE WIRE OUTSIDE HOUSE IF POSSIBLE i i 10 RECEIVER gt ro RECEIVER ANTENNA ANTENNA amp GROUND AQ cO gt gt CONNECTIONS AND G GROUND CONNECTION P M ARRESTOR DUAL TYPE LIGHTNING ARRESTOR SINGLE TYPE STAKE IN GROUND 55 65 STAKE IN GROUND OR WATER PIPE IN visi WATER PIPE IN CELLAR CELLAR TYPICAL LIGHTNING ARRESTOR INSTALLATIONS Ave s EY A The first antenna connection illustration shows the simplest system with the 6 meter band fed through the links from the low frequency antenna This arrangement provides good overall coverage but if a particular band is intended to be used consistantly the use of a dip
32. Response permits tops in listening pleasure of AM SSB and CW reception 144 to 148 Mes dial calibration provided for use with converter having output tunable F frequency range of 50 to 54 Mes eM EV HQ 170 A INSTALLATION Your Hammarlund Receiver is designed to give you the very best results A few minutes to be sure it is installed correctly is worth while Even though we have developed the most sensitive circuitry to select and amplify the signal you want to hear remember that it can work only on the RF you feed it from your antenna It is to obtain the most satisfaction in its operation that we urge you to put up the best antenna system you can The HQ 170 A will work very well with a temporary wire strung out of a window but only use this method while constructing having constructed a proper antenna system Finally good ground serves many purposes one it eliminates tendencies towards AC hum pickup often straying through homes apartments two it minimizes atmospheric and made noise three it ensures a safe path for any voltage coming from a possible short or from an associated When using an outside antenna it is always best to install a lightning arrestor Such a device drains off the atmospheric charge in a safe manner protecting you and the Receiver Nore tar of corrections at fhe rear of the sel and that there are a variety of very useful terminal
33. SURE INTELLIGIBILITY SET DESIRED VOLUME SET TO RECEIVE IF RECEIVER IS USED ALONE IF RECEIVER IS TO BE MUTED BY TRANSMITTER RELAY CONTACTS REAR CON NECTIONS SET TO SEND TO USE CALIBRATE CRYSTAL SEE CODE RECEPTION INSTRUCTIONS SET TO U UPPER OR L LOWER DE PENDING ON SIDE BAND USED SEL ECTION RESULTS FROM EXPERIENCE AND METHOD OF SSB OPERATION ON PARTICULAR BAND FOR SSB SET TO MAX OR AS DESIRED MAIN TUNING SET FOR LOUDEST sequence VERNIER TUNING SIGNAL IGNORE INTELLIGIBILIT Y ADJUST FOR BEST SEE NOTE 8 INTELLIGIBILIT Y HP PPP t ppt at Pr m tari rt TE E OPERATION NOTES AM RECEPTION I For best fidelity use the widest 3 KCS and BOTH bandwidth In the presence of interference or noise reduce to 2 or to increase intelligibility but fidelity will be decreased The slot depth control is actually a very gradual vernier adjustment In view of this its effect will not be very noticeable unless the proper procedure is employed The suggested procedure is as follows Tune in the crystal calibrator or other strong signal source with a constant carrier to a maximum S meter reading Whenever the receiver is being tuned for normal reception be sure to first rotate the slot frequency control either the plus or minus 5 KC position Never leave the slot
34. THE HQ I70A COMMUNICATIONS RECEIVER THE HAMMARLUND HQ 170A AMATEUR HAM BAND RECEIVER CONTENTS OF INSTRUCTION AND SERVICE MANUAL Specifications Page 1 Circuit Description Pages 2 and 24 Installation Page 3 Operation Page 15 Service and Maintenance Page 36 Removing and Replacing The Chassis Page 37 Removing and Replacing The Front Panel Page 39 Replacing the Dial Cord Page 44 Alignment Procedure Page 50 Tube Socket Voltages Page 60 Tube Socket Resistances Page 61 Parts List Page 62 Schematic Diagram Last Page Fold Out lt lt lt 170 Amateur Bands Covered 6 10 15 20 40 80 and 160 meter bands ial morkings every 5 KCS on 20 40 80 and 160 meter bands every 10 KCS on 15 meter band every 20 KCS on 10 meter band every 50 KCS on 6 meter band Plus 2 meter calibration scale Number of Frequency Conversions Dual on 160 and 80 meter bands Triple on 40 20 15 10 and 6 meter bands Frequency Range Covered 1 8 2 0 3 5 4 0 7 0 7 3 Mes 14 0 14 4 Mes 21 0 21 6 Mcs 28 0 30 0 Mes 50 0 54 0 Mcs Converter Scale 144 148 Mes Maximum Audio Output 1 0 Watt Undistorted Passband Tuning Range plus minus 3 KCS with calibration every 1 KC 8 1 vernier tuning ratio Output impedance 3 2 Ohms E1A Standard plus 500 Ohms AVC Action Operates on RF and 3 IF stages Provides fast charge adjustable discharge s
35. UNWANTED SIGNAL SEE NOTE 2 SET TO JUST BEFORE THE POINT WHERE AUDIO OUTPUT STARTS TO DECREASE IN LEVEL SEE NOTE 3 SET TO SLOW MEDIUM OR IN CASE OF SIGNAL INTERFERENCE TURN TO POINT WHERE UNWANTED SIGNAL IS LEAST SEE NOTE 2 TUNE FOR MAX CARRIER LEVEL METER READING HEADPHONES REDUCE BANDWIDTH IN CASES OF SEVERE INTERFERENCE OR NOISE SEE NOTE 1 SET TO RECEIVE IF RECEIVER IS USED ALONE IF RECEIVER IS TO BE MUTED BY TRANSMITTER RELAY CONTACTS REAR CONNECTIONS SET TO SEND TO USE CALIBRATE CRYSTAL SEE CODE RECEPTION INSTRUCTIONS MAIN TUNING KNOB SET TO DESIRED VOLUME BAND SELECTOR KNOB VERNIER TUNING KNOB FOR AM SET TO MAX REDUCE IF CARRIER LEVEL METER EXCEEDS 40 S METER CALIBRATION ACCURATE ONLY WHEN RF GAIN MAX AND IN SLOW MEDIUM OR FAST emn em em US guum c ads IPLE PUN AFTER TUNING TO ZERO BEAT TURN TO SET HAIRLINE EXACTLY ON IOO KCS MULTIPLE SELECTED TURN BACK TO RECEIVE RETUNE TO CARRIER LEVEL METER DOES NOT READ WHEN AVC IS OFF STATION AND READ FREQ ON CLOCK TIMER SEE AM RE DIAL UNDER HAIRLINE CEPTION FOR INSTRUCTIONS FOR ADDED SLOT REJECTION SET FOR LEAST UNWANTED SIGNAL SEE NOTE 2 SET TO JUST BEFORE THE POINT WHERE AUDIO OUTPUT STARTS TO DECREASE IN LEVEL SE
36. VJNIVW 150413 SISSVHO 30ISH3QNA NO SA 30 ZNid OL IVNDSIS SIJA 09 er AINO 9 5 401 048 SOX 09 Step2 Turn the mode switch from to CW Check that the BFO is set to zero then adjust T28 for zero beat as heard Q in the loud speaker Return the switch to AM Step 3 Disconnect the Signal Generator from V5 and reconnect it to V2 as shown in the illustration Apply an unmodulated 455 KCS and turn the Band Selector to the 3 5 4 0 MCS band Set L4 the top and bottom slugs of T5 T4 and T3 and the top slugs of T2 and TI for a peak reading Remember to reduce the IF input signal level as necessary to maintain about 5 volts Step 4 Turn the Slot Frequency control to zero and the Slot Depth control to its mid position Set L3 for minimum meter reading It may be necessary to raise the IF input level to be sure of indicating the absolute minimum Return the generator level and the Slot Frequency and Depth controls to their previous conditions Step 5 Apply an unmodulated 3035 KCS and turn the Band Switch to the 14 0 14 4 MCS band Set the bottom slugs for a peak reading again maintaining the 5 volts This completes the IF alignment procedure For RF alignment continue with Step 6 below q 54 Step 6 Step 7 RF ALIGNMENT Retain the VTVM connected os before Connect the Signal Generator to the antenna terminal strip wit
37. bands Section S2F of the band switch accomplishes this by removing the crystal circuit from the oscillator portion of the tube at this time When the oscillator is allowed to work the first IF signal beats with the oscillator signal to become the second IF In any case the output at 455 KCS is available at the pin jack J5 located on the rear of the chassis V4 is a 455 KCS amplifier whose gain is also controlled by a second section d of the RF gain control resulting in receiver sensitivity adjustment in the same manner as before Before the 455 KCS signal is applied to the third mixer it is passed through the slot circuit This circuit is designed to provide a narrow section of frequency rejection capable of being set precisely on on interfering signal The slot depth control permits its depth or amount of rejection to be set as required for best results The diagrams show the characteristics and the capabilities of this circuit 1 26 ONINAQOJ3L3H ADNINOIWI JO LYVHD Aouanbeiy joubis SOW 04 06 JO JI UD g A uQ uoupiq op Io q 2 0 8rl O vrl 09 666 SSP SE0E S S 9 076 070 09 666 SSP 08sz 6608 6606 5 01 0706 0782 09 666 08 2 SOC 6606 5 S Sl 91 0 12 09 666 086 6606 6606 5 02 7 o l 09 666 0852 6606 6606 5 S Or 7 07 09 666 96015 1314 dwy S 08 o
38. beat the calibrator by means of the adjustable trimmer and the crystal appears to be low in frequency the frequency of the crystal can be raised by substituting an external 470K watt resistor for the one in the couplate Z1 This is accomplished by unsoldering lead 7 of the couplate from one side of the trimmer and connecting the external 470K resistor across the trimmer terminals This change will usually make it possible to zero beat a crystal that is too low and out of the range of adjustment provided by the trimmer Please remember that the low frequency response of the receiver is increased when the audio gain control is employed at the lower end of its range This is the result of the auto response circuit Increasing the audio gain control setting to a position past straight up and reducing the RF gain will make it possible to obtain the same volume level with less low frequency response and usually better signal to noise ratio If it is desirable to reduce some of the low frequency response at the lower settings of the audio volume control the auto response feature may be dispensed with by merely short circuiting resistor R47 47 ohms This results in removing the feedback which provided the better low frequency response Very truly yours THE HAMMARLUND MFG CO INC Frank I Lester W2AMJ Sales Manager file C BoatAnchors Hammarlund HQ170A HQ1 70S VC TXT 3 of 4 27 2004 4 20 24 PM
39. cified is for this reason that the adjustable dial marker and the 100 kc calibrator is provided for the correction factors RF FEED BACK In the event that RF feed back is experienced when the relay terminals on the rear of the HQ 170 are employed this usually indicates that the relay leads between the receiver and antenna relay are picking up RF This may be due to the particular lead length or a high standing wave ratio on the antenna system The solution is of course to prevent the RF pickup of the relay leads from getting into the receiver Adding a pair of 01 disc ceramic capacitors from each of the relay terminals to ground will usually eliminate the feed back condition These extra 01 capacitors file C BoatAnchors Hammarlund HQ170A HQ1 70S VC TXT 2 of 4 27 2004 4 20 24 PM file Cl BoatAnchors Hammarlund HQ170A HQ170SVC TXT should be installed using as short lead length as possible and preferably mounted inside of the receiver bypassing each of the relay terminals to ground We have recently received a few complaints advising that the slot depth control on the HQ 170 receiver is apparently inoperative This we can assure you is decidedly not the case since from all indications too much is being expected insofar as the effect of this control being very noticeable is concerned The slot depth control is actually a very gradual vernier adjustment In view of this its effect will not be very no
40. correct setting is not reducing Recei ver capability 2 Always tune the Receiver properly to produce the maximum signal 3 Don t forget the antenna trimmer it requires a different setting on each band This is because antenna impedance changes with frequency the trimmer is there to allow for a maximum match at all frequencies Plug the Receiver line cord into a 117 volt 60 cycle line the export model HQ 170 A E will accommodate 117 or 230 volts 50 or 60 cycles Turn the Receiver on using the RF gain control and the clock timer switch if installed Check that all tubes are lit Note that the high frequency oscillator and mixer tube filaments remain heated at all times if the line cord is left inserted into a source of AC power Heating of these tubes eliminate drift that occurs in all oscillator circuits as they heat up Tube life is not reduced through continuous operation In fact its life is often extended to many times normal because it is not subjected 15 to the hardships of physical expansion and contraction due to heating and cooling when power is applied and removed If the oscillator has not been maintained heated then allow one hour for the Receiver to settle down to a steady tuned condition Readjust tuning as necessary during this period Do not attempt to calibrate or set the S meter until drifting has stopped The HQ 170 A Receiver is arranged to provide the best reception for AM voice for Code modulated or unmodula
41. d extremely nasal Adjust the Main Tuning dial for maximum signal strength to be judged by ear or S meter Adjust the Vernier Tuning for maximum speech intelligibility The Vernier Tuning must be tuned slowly for effectiveness Intelligibility can only be obtained by proper choice of upper u or lower 1 sideband reception The BFO Beat Frequency Oscillator control is disconnected in SSB position The accepted or most popular transmission of single sideband signals insofar as the sideband used will usually be as follows 75 meters 3 8 to 4 mc Lower Sideband 40 meters 7 0 to 7 2 mc Lower Sideband 20 meters 14 200 to 14 350 mc Upper Sideband 15 meters 21 250 to 21 450 mc Upper Sideband The use of upper or lower sideband will vary on the other bands covered by this recei ver and it is not unusual for the other sideband to be used on the above mentioned bands If a SSB signal cannot be made intelligible using the vernier tuning control change to the other sideband switch position On six meters the sideband switch is reversed due to the high frequency oscillator being used on the low side of the incoming signal which results in the upper sideband being received in the lower sideband position and vice versa li HQ 170 A MAINTENANCE This Receiver has been carefully constructed inspected adjusted and aligned at the factory to provide a long period of trouble free use Unless you have the proper equipment and the d
42. ducting any signal applied to V10 from the detectors is passed through to the audio gain control In the ON position the plates are connected to ground while B is applied to the cathodes through the noise limiter control The circuit is arranged that when the control is at its counterclockwise end of rotation audio is permitted to pass through almost unreduced As the control is turned clock wise the B applied to the cathodes increases so that strong peaks are clipped In operation it will be noted that the noise limiter is used to clip noise peaks that are higher than the desired audio the control is therefore turned clockwise until it is noted that the wanted audio starts to be clipped volume reduced The correct position of the sisti is just below the point where this occurs At this point maximum clipping is occurring without reducing the wanted signal The noise limiter is capable of operation on any type of signal but it should be noted that less noise and interference can often be obtained by reducing the receiver bandwidth as well Automatic volume control voltages are developed from the two circuits illustrated RF detection takes place through both V7B and the diode section of V15 Each circuit is arranged to reduce a negative voltage that will increase as the recei ved signal increases Except in the OFF position AVC voltages are applied to the RF 31 m OFF W AVC O SLGUM SWITCH DETECTOR POSITIONS
43. dure the equipment listed is required Non metallic alignment tools general Cement 5097 and 8282 or equivalents DC Vacuum tube Voltmeter Signal Generator s capable of accurately producing unmodulated signals of 60 KCS 455 KCS 3035 KCS and RF ranging from 1 8 MCS to 54 0 MCS Alignment must be undertaken with the Receiver out of its cabinet Remove the chassis from the cabinet as instructed in this Manual When removed set the chassis on its end with the power transformer down nearest the table top This is to permit access to both the top and bottom of the chassis Before operating the Receiver adjust the S meter pointer screw on the front face of the meter to set the needle exactly over the zero mark on the scale Connect the speaker to the Receiver plug the set into a source of power and turn it on BEFORE ALIGNMENT THE RECEIVER MUST BE ALLOWED TO WARM UP FOR AT LEAST A HALF HOUR This is to assure frequency stability 50 After warm up set the RF gain control fully counterclockwise without actually turning the set off and adjust the meter zero control at the rear of the Receiver chassis again for zero on the scale The AVC switch must be set to a position other than OFF for S METER ZERO ADJUSTMENT the meter to read D o 0000220 e Q REAR OF CHASSIS Set all of the front panel controls as shown in the illustration at the start of the alignment procedure Changes to these settings will be
44. e then hook the spring to the hole on the right side 3 Wrap the other half of the cable 1 3 4 turns counterclockwise and guide this end to the larger pulley Loop around the larger pulley 1 1 2 turns counterclockwise and hook the spring to the hole on the left side 4 Turn the pulleys back and forth and manipulate the cable until the tension on the springs is about equal This completes the installation of the dial cable To replace the dials the front panel the controls and the knobs continue with Step 7 45 LOCKWASHER AND NUT LOCKWASHER ONLY TUNING DRIVE LOCKWASHER FRONT OF CHASSIS HARDWARE FOR MOUNTING CONTROLS WHEN PANEL IS REMOVED SIEP 47 After Step 10 is completed check that the dials and the dial calibration system operate smoothly and without interference If necessary loosen the front panel screws of Step 4 and readjust panel positioning to obtain proper dial operation Step 11 Replace the two red pointers by pushing them onto the inner shafts Be careful not to bend them Follow the instructions on the Step 11 diagram for capacitor plate meshing then replace all knobs Knob identification appears in the Step 1 illustration wc Step 12 This step is for dial Reconnect the Receiver and turn it Allow it to warm up for about a half hour After the warm up period tune in to 14 MCS and turn on the crystal calibrator see instruc
45. ed to 50 05 on the dial 50 MCS applied from the generator After all alignment is completed place the chassis in the cabinet or on a metal plate that will cover the entire open chassis and check that the 50 MCS signal tunes in to 50 MCS on the dial If it does not alternately readjust 126 and place the receiver on the metal until it does The crystal calibrator is factory adjusted to zero beat with the National Bureau of Standards radio signal coming from WWV If adjustment is determined to be necessary another receiver capable of receiving WWV on any one of its operating frequencies is required The HQ 170 A does not tune WWV frequencies Set the Send Receive Calibrate switch to Calibrate To set the calibrator connect a wire from the isolated antenna terminal of the HQ 170 A to the antenna terminal of the second receiver Tune in WWV on this receiver Set the 170 calibrator adjustment C50 for zero beat TO SECOND RECEIVER ANTENNA CONNECTION ANTENNA TERMINAL STRIP This completes the RF alignment procedure Return the chassis to the cabinet as instructed in this Manual 59 e e 40 OFF 40 OFF 1 2 40 OFF 0 6 3 VAC 12 40 OFF 6 3 250 255 6 3 1 65 MAX 4 3 MIN 16 6AQ5 100 CONTROL SETTING TUNING RANGE 14 14 4 MC AVC NOISE LIMITER wirt SSB WHERE NOTED RF FULLY
46. elay in the transmitter the 100 volts of negative bias available in the transmitter is made available to Silence the receiver When this type of receiver silencing is desired the relay receptacle on the rear of the HQ 170 is not employed In order to adapt your HQ 170 for this operation it is suggested that the two leads that are now connected to the relay receptacle be removed and each one taped up so that they are insulated from one another and the chassis This may be dressed conveniently out of the way 5 megohm 4 watt resistor and 15 of insulated shielded lead is now required One end of the 5 megohm resistor should be connected to pins 5 or 6 or tube socket V16 or the 6AV6 The other end of this resistor is then connected to the inner conductor of the insulated shielded lead with the shield left floating at this point insulated to prevent shorting to the resistor inner conductor or any part of the wiring The other end of this insulated and shielded lead should have the center conductor connected to one or both of the relay terminals with the shield connected to any convenient ground or chassis connection The bias lead from the Vox circuit is then connected to one or both of the relay receptacle terminals a standard AC plug may be employed in the relay receptacle It is now necessary to employ a common ground connection between the HQ 170 chassis and the transmitter chassis in order to complete the biasing circuit Making changes will result in
47. er on the 7 MCS through 54 MCS bands and dual conversion on the 1 8 MCS to 2 0 MCS and 3 5 MCS to 4 0 MCS bands Starting at the front end the HQ 170 A utilizes a 6826 tuned RF amplifier and a separate mixer 6BE6 and oscillator 6C4 for a high degree of stability Advanced design and modern tube types account for the very high gain and low noise factor Refer to page one for complete listing of the many possible functions and the complete tube lineup Low loss coil forms and bandswitch wafers plus tempera ture compensating capacitors and the application of regulated power to the oscillator circuit provide a high degree of stability BANDSPREAD Electrical bandspread tuning with direct dial calibration is provided for all seven bands 160 80 40 20 15 10 and 6 meters Through the use of two dials optimum band spread has been achieved by greater dial scale length A 144 MC scale is also included TRIPLE CON VERSION The HQ 170 A offers triple conversion with IF frequencies of 3035 KCS 455 KCS and 60 KCS pro viding excellent rejection of image response The second IF is heterodyned with a crystal controlled oscillator The third IF is heterodyned with a high stability adjustable oscillator which contains micro accurate vernier tuning control located on the front panel IF AMPLIFIER The 3035 KCS and 455 KCS IF amplifiers provide DESCRIPTION circuits in the three stage 60 KCS amplifier provide either the second or third
48. etailed knowledge to service complex electronic circuitry it is not recommended that any other maintenance but tube testing be attempted In particular DO NOT ADJUST TRIMMERS OR TRANSFORMER CORES because this will reduce the reception capabilities unless it is done while following the alignment instructions correctly 23 HQ 170 A CIRCUIT DESCRIPTION Many Receiver troubles frequently be resolved simply by testing and changing tubes and by making a few minor adjustments but in order to properly service this set it is important to be able to diagnose obscure troubles through an understanding of the circuits involved It is for this purpose that this section is provided A communications receiver of this type contains several special circuits not normally included in the home radio Examples of such circuits are the BFO beat frequency oscillator the slot triple conversion delayed AVC automatic volume control etc The complete circuit of the HQ 170 A is shown in the schematic diagram included at the end of this book To help in understanding this diagram a block version is presented on the next page While reading the text follow both the block and schematic diagrams one will illustrate the overall scheme while the other will provide all of the connection details The RF signal is received at the antenna and applied to the RF amplifier through the antenna terminal strip or shielded connectors and through the band
49. h both links closed Check that all the controls are set as in the diagram with the exception of Selectivity to 3 KCS Side bands to Both Check that the dial cord the dial drive and the tuning knobs are properly operating and tight Repair if required Check that the dial calibration is set to the center mark The RF alignment is now undertaken All coil and trim adjustments are made to produce a maximum VTVM reading As the alignment progresses remember to reduce the RF Gain to maintain the 5 volts this is to prevent overloading of the Receiver stages resulting in incorrect tuned circuit peaking Follow the order of adjustment shown in the following chart start with the top line of 50 54 MCS and work each line from left to right Osc RF and Ant in that order The Osc and RF adjustments will interact to some extent repeat each in turn ending with the RF Trim as the last NOTE The oscillator frequency is on the high side of the incoming frequency on all the bands except 50 54 MCS If two points on an oscillator setting appear the furthest counterclockwise is the correct one for the lower bands The furthest clockwise is correct for 50 54 MCS 55 ead to its in mm SETTINGS IN MCS RECEIVER ADJUSTMENTS RECEIVER GENERATOR OSC OSC RF RF BAND TUNE TO SET TO COIL TRIM COIL TRIM 21 21 6 120 Ta 21 21 6 21 6 x 8 14 14 4 ree 14 14 4 A 4 94 4 8 2 T23 T TIKT 8 2 T
50. he automatic noise limiter can reduce noise to the point where its audio level is electrically no higher than the desired siqnal level This point is indicated by the start of audio level decrease as the limiter control is rotated clockwise The proper setting for this control is therefore at the point just before the audio output of the desired signal is reduced Further rotation decreases noise and signal equally without improving signal to noise ratio 21 CODE AND SINGLE SIDEBAND RECEPTION 4 22 Interrupted continuous wave ICW transmissions do not normal ly provide steady signals for S meter readings However readings can be made fairly well in CW reception using the SLOW AVC position of the AVC switch In any case tune for the loudest signal level heard The 100 KCS multiples of the Crystal Calibrator will be found at or near the one decimal numbers only such as 1 9 14 3 etc when the Send Rec Cal switch is in the Cal position For code reception never set tone by adjusting main tuning because this detunes the Receiver Always set BFO to zero first tune receiver for zero beat THEN set BFO for desired tone On SSB carrier level meter fluctuates with audio Tune for maximum audio or apparent S meter level SSB Single Side Band signals can be identified by the lack of a carrier or beat note whistle when tuning across the signal A Single Side Band signal NOT properly tuned in will sound scrambled an
51. in this case The accessory socket is included on the HQ 170 A chassis for convenience in supplying power to the preamplifier or converter if desired since many of these units are designed to operate in this manner Consult their instruction manuals for complete details wiring as needed from the accessory plug provided with the HQ 170 A 50 54 MCS B VIEW FROM WIRING SIDE OF SOCKET OR FROM PIN END OF PLUG SWITCHED 6 3 VAC FOR FIL GROUND ACCESSORY SOCKET CONNECTIONS 13 The system socket connections provide for a voriety of uses depending upon the transmitter system installed Compatibility with Hammarlund 50 HX 500 Transmitters included See their instruction manuals for details 6 3 VAC VIEW FROM WIRING FROM RECEIVER X SIDE OF SOCKET OR FROM PIN END OF PLUG RECEIVER GRID BLOCK BIAS MUTING RELAY CONTACTS X ALWAYS ON IF RECEIVER PLUGGED INTO SPEAKER OR LIVE POWER LINE CONN SYSTEM SOCKET CONNECTIONS lt HQ 170 A OPERATION With the antenna speaker and any accessories installed you are ready to receive transmissions on the amateur bands These pages are intended to show you the operating methods that will permit the Receiver to give you the best audible signal possible considering atmospherics and man made noise Three most important reminders 1 Check the listening aids like the noise limiter and slot rejection filter be sure in
52. mooth acting AVC Delayed AVC applied to the RF and 1 IF stage Better than 001 second attack time and Ol 1 1 Second decay time Off position Adjustable Selectivity and Selectable Sidebands db bandwidths Upper sideband 1 2 3 kcs Lower sideband 7 2 3 kcs Both sidebands 5 2 4 6 kes Sensitivity An average of 1 5 microvolts produces 10 1 signal to noise ratio on AM approximately 7 pv on CW and SSB Antenna Input 100 ohms nominal balanced or unbalanced Provision for separate 50 ohm coaxial 6 meter antenna Plus SO239 UHF Antenna connector accessory socket Antenna Compensator Permits compensation for loading effects of various type antennas or balanced transmission line Beat Frequency Oscillator Variable from zero beat plus minus 2 kes plus fixed position for SSB Slot Filter Range plus minus 5 kcs of center frequency Attenuation over plus minus 5 kcs range provides over 40 db Calibrations every ke Maximum attenuation using slot depth control is 60 db 8 1 vernier tuning ratio Tube Complement 6BZ6 RF Amplifier 6BE6 Ist Converter 6C4 HF Oscillator 6BE 2nd Mixer Crystal Osc e 6BA6 455 IF Amp 6BE6 3rd Mixer Variable Osc SPECIFICATIONS 6846 60 kc IF Amp 6846 60 IF Amp 68V8 6 kc IF Amp AVC AM Der 12AU7 SSB Product Detector 6AL5 Noise Limiter 12AU7 BFO S Meter Amplifier 6AV6 15 AF Amp Delaved AVC Clamp 6AQ5 Audio Power Output OB2 Voltage Regulator
53. ole tuned to that band is recommended The illustrations show how such an antenna is made and what Receiver connections are necessary In each case the 6 meter band does not receive the best signal It is possible to make a satisfactory dipole for this band but a commercial beam is better in performance For all antennas the shielded or twin lead methods are a decided improvement over the single wire to minimize man made interference and noise signals In especially noisy areas this may be the only way to develop an acceptable signal Each of the antenna connection schemes require very little wiring complications or soldering technique For those familiar with soldering no trouble will appear For those who have never soldered it is recommended that some practice be obtained before attaching a pin plug to a shielded cable However the experience gained from work on even one hi fit kit or radio is heat just enough to allow solder flow Excess heat will melt some plastic 1 cable installation are included in this book Remember not to apply too much x insulations possibly causing a short between the center conductor and the shield FOR SINGLE WIRE ANTENNA SYSTEM TO GOOD EXTERNAL GROUND BOTH LINKS CLOSED 3 INTERNAL CONNECTION X X INTERNAL CONNECTION THROUGH BAND SWITCH IN 50 54 MCS RANG ANTENNA CONNECTIONS FOR SINGLE WIRE ANTENNA 6M BAND FED FROM LOW FREQUENCY ANTENNA COAXI
54. r s e 09 666 4 1314 dwy 5 091 02 681 Xi 250 d 250 d 250 N SWALAW Sow pag puz puz 45 151 SON aNva 27 455 A UPPER sme s sus 40 JMEERRREESEEENBS Maux e mu MNREEBENREXEERKEES 765432 I O I 2345 6 7 KILOCYCLES SLOT FREQUENCY AT CENTER 60 KCS LOWER TTIITMI PTT TAA gt 7654321012345 67 KILOCYCLES SINGLE SIDEBAND PASSBAND CURVES When Sidebands Sw is set to Lower q mirror image of the Upper Sideband Selectivity Sw Sidebands Sw Db 455 UPPER BL CCA PANE LEUTE TL TEES TTT TT FAMB EENKESSNEL DEREMERSNSEENE 7654 32 0 23 4 567 KILOCYCLES EXAMPLE OF SLOT AT 3 KCS SUPERIMPOSED ON THEORETICAL 455 KCS PASSBAND CURVE 60 KCS is CENTER UPPER LOWER LL LULA PLT VIN 2 AAH ARR E 432101234567 KILOCYCLES FULL RESPONSE CURVES BOTH SIDEBANDS Conversion again occurs to result in a third IF of 60 KCS Three stages of 60 KCS IF amplification are provided along with means for adjusting the selectivity of the receiver to aid in the rejection of unwanted interfering signals This
55. r adjustment made by the slot frequency control only check of the slot depth control setting may be advisable periodically It is hoped that the above information will prove of interest and assistance If after following the various suggestions trouble cannot be eliminated please write to us supplying as much detailed information as possible in order that we may endeavor to be of further assistance or authorize return of the receiver for repair Please refer to terms of our warranty on the inside rear cover of your instruction manual which will apply under these circumstances Erratic performance in the triple conversion bands such as a temporary loss of gain after a period of transmission or stand by operation which is cured by rotating the band change switch or turning the receiver off and then on again usually involved the second 6BE6 converter of V3 in the schematic diagram If changing this tube does not permanently cure this condition changing the value of R10 from 22K to 47K is recommended If new 6BZ6 in the crystal calibrator does not result in improving the output of the crystal calibrator to your liking additional output may be obtained by increasing the screen voltage this is accomplished by merely adding an external watt resistor from 47K to 100K across terminals or leads 3 and 4 of the couplate Z1 in the schematic diagram If upon checking the 100 kc calibrator against WWV using another receiver it is not possible to zero
56. sitive set and speaker vibration can cause regenerative oscillation electronically impairing reception Note that a jack is provided in the lower left corner of the front of the Receiver for headphone plug insertion The loudspeaker is automatically disconnected when the phone plug is inserted HEADPHONES High impedance magnetic phones will usually be found satisfactory when the headphone jack is employed The phones are deliberately mismatched to reduce the level into them If more level or volume is desirable low impedance phones may be employed These may be any of the popular impedances such as 8 16 or 24 ohms If you do not have headphones and desire to purchase a pair the low impedance type is suggested since it will always be possible to reduce the volume by making use of the audio volume control Another alternative if high impedance phones are available is to perman ently connect these to the 500 ohm line output terminals on the rear of the receiver These will provide more volume than the headphone jack since the headphone jack impedance is 3 2 ohms or the same as the speaker TO SPEAKER 320 SPEAKER CONNECTION TO LINE 5000 LINE CONNECTION The Receiver connections for the antenna and ground are clearly illustrated on these pages and a few hints are given for antenna installation but the HQ 170 A owner is urged to read a good antenna book to select the best type for his purpose The Amateur Radio
57. suggested This transformer is connected backwards with the voice coil connections to headphone plug and the 500 ohm line connections to the phones The resultant impedance step up will provide higher headphone volume This procedure should only be resorted to when absolutely necessary such as when a person may be hard of hearing It should be remembered that as a result of increasing the headphone level any residual hum will also be increased which the hard of hearing person will not find objectionable whereas a person with normal hearing may VOX CIRCUIT REQUIREMENTS In the event that the vox circuit in your transmitter may be designed for 500 ohm input and in the event that sufficient gain in this circuit may not be available to provide proper performance from the 3 2 voice coil winding the matching transformer referred to in the headphone paragraph may be employed Under these circumstances the voice coil winding should be connected to the speaker terminals with the 500 ohm line winding to the Vox circuit Such a matching transformer may also be required or useful for phone patch operation depending of course on the design of the phone patch GRID BLOCK BIASING FOR VOX CIRCUITS Many of the single side band transmitters being produced today provide 100 volts negative bias which is switched from the transmitter to the receiver by the Vox circuit The Hallicrafter HT 32 transmitter is a good example As a result of the voice control operating the r
58. switched antenna tuned circuit The antenna trimmer compensating for differing antenna characteristics at differing frequencies is located across the secondary of the antenna transformer The calibration oscillator turned on in the calibrate position applies its signal to the RF amplifier This oscillator is a crystal controlled type at 100 KCS developing a very large number of 100 KCS harmonics to cover all of the bands in the Receiver To control the Receiver one section of the RF gain control sets the bias of the RF amplifier stage Rotating the control clockwise decreases 24 torre m nens NC AOA mem tnm ms rtm m e yn T Hy ren LE 1 i To a ine sensi E ma H3AI303H VOLI OH WVYSVIG 2018 6219 048 48 66 ass A11A112313S S3NOHd E i ind s 9 9 ae wy qas as l invell YSA r0 S 2 lt 2 A 330 NO T T O 130 3SNOdSau 1855 H3XINW indino olany Wn GA dl 4l di 15 3SION MD 94 09 93 09 09 noga Tuv 60 9 SIA SAWS BSIA 5179 GIA 8A89 VBA 9V89 A 9V89 5 1 61 NY OX3Z 5 35 889 88 85 YILIN 5 LNVLSNOO 697 INIL SN3S YILIN SAV JH ep 10 21 ASIA BAGS OBA 2 HOLIMS 9 9 S v 01 238 ON3S
59. ted CW and for SSB single sideband operation To be sure of the best results and the clearest reception read all of the instructions presented here Set the controls as shown in each illustration for normal operation and follow the guidelines to improve performance and to tune over the bands Become familiar with each control and see what each can do for you Even after you are familiar in every way wi th the controls refer occasionally to these instructions to check that you are still getting the most out of the many features of the HQ 170 A Finally your particular location and installation will affect operation experiment with control settings to obtain the best results And consult with us if there are any problems The Receiver is for your enjoyment use it correctly and it will give you years of service The Carrier Level S meter has been adjusted at the factory for correct and calibrated operation however two zero adjustments should be checked and reset if necessary one is mechanical the other electrical 1 With the Receiver turned off adjust the meter pointer screw on the front face of the meter to set the needle exactly over the zero mark on the scale 16 PUR S ls kur Turn the be sure to allow a 2 hour warm up before proceeding further Set the HQ 170 A to Receive and set the RF Gain control fully counterclockwise without actually turning the set off Now adj
60. the 5 megohm resistor being in series with the bias lead to the AVC bus in the HQ 170 The 5 megohm resistor isolates the bias supply and prevents this lead from affecting the AVC circuit The shielded lead is recommended to prevent RF pickup and is really a precautionary measure It may also advisable a shielded lead the receiver and the transmitter This system in no way implies that the antenna changeover relay or a suitable TR switch will not be required Failure to employ one or the other may result in burning out the antenna coils of the receiver or other possible damage Lab tests indicate that minus 75 volts will silence the receiver when one volt of RF is applied to the antenna terminals 75 volts negative bias is therefore the suggested minimum value for complete silencing The full bias voltage is not applied to the grids due to a voltage division which takes place as a result of the 5 megohm resistor and the other resistors employed in the AVC system DIAL CALIBRATION ACCURACY Please remember that we do not claim frequency meter accuracy Our production tolerance on this receiver is plus or minus a dial division This tolerance is necessary as a result of working to printed dial scales The band edge markers are held to very close tolerance usually plus or minus the thickness of the dial marker The total runout or what is often referred to as tracking error will usually be within the plus or minus a dial division as previously spe
61. ticeable unless the proper procedure is employed The suggested procedure is as follows Tune in an AM signal on any band or any other strong constant carrier of similar nature such as crystal calibrator Whenever the receiver is being tuned for normal reception be sure to first rotate the slot frequency control to the extreme clockwise or counter clockwise position other words never leave the slot frequency control at or near the zero setting If this procedure is not followed it is obvious that the center of the pass band will be slotted out in some cases this being quite obvious by producing 2 spot tuning or 2 peak S meter readings After tuning in the constant carrier and peaking the S meter taking the above precautions rotate the slot frequency control It will be noticed that upon approaching the zero setting the S meter reading will be effected A very definite null or minimum S meter reading will be obtained with the slot frequency control adjusted at or near zero Observe this S meter reading With the slot frequency control set at the minimum S meter reading position the slot depth control should be rotated very slowly throughout its range observing the S meter It will be found that one particular spot throughout the range of the slot depth control a further reduction in the S meter reading will be obtained Once this setting has been obtained the slot depth control may be left permanently in this position and all future slot filte
62. ting prearranged schedules Optional extra lt lt lt BETTY i L d aa E a a a aa as Aer d I eT EX TURPE CD PCR HQ 170 A Starting with the front panel layout the careful selection of high reliability components the craftsmanship of skilled tech nicians and the addition of engineering leadership result in a receiver worthy of the Hammarlund name in quality and per formance The HQ 170 A offers the amateur a practically endless combination of tuning techniques whereby reception of SSB CW and AM MCW may be achieved Through the use of the vernier tuning adjustable bandwidth and the basic precision front end of the HQ 170 A the user has full control over SSB signals as well as adjacent or co channel signals If there s a signal to be received the HQ 170 A can ferret it out The HQ 170 A is a hot receiver It will provide 10 db signal to noise ratio at 1 5 pvolt AM or approximately 5 pvolt CW or better depending on bandwidth The front end provides tuning of the 6 10 15 20 40 80 and 160 meter amateur bands The receiver is designed for use with a single wire flot top a folded dipole or doublet antenna Separate antenna terminals are provided for 6 meter reception so that a separate 6 meter coaxial antenna may be installed to achieve the ultimate in receiving sensitivity at this frequency CIRCUITRY The HQ 170 A is a triple conversion receiv
63. tion is exactly the same as for CW except that the BFO is a fixed frequency In SSB operation tuning for intelligibility requires that the suppressed carrier be replaced within the receiver The BFO does just that the 29 BETTE TT lt Arona ne ne rene cep s MODE SSBO SWITCH POSITIONS C42 LIO NOISE VRISM LIMITER E TO AUDIO 60 KCS LF GAIN CONTROL 6 vec AM C44 R42 DETECTOR 8 osc R44 GRID nile jai O B O C M NOISE LIMITER kal AND C49 R77 S CONTROL SWITCH R74 C43 124 CLOCKWISE 45 R73 R45 Z 134 6 6 BFO ET v9 2 1 CI25 7 PRODUCT DETECTOR 16 a C35 21 lt 126 QR76 2 1 if l 128 2 FT R75 127 ci29 L J CI53 EO FIXED FREQ FOR SSB DETECTOR 8 NOISE LIMITER CIRCUITS vernier tuning dial being used to precisely tune the receiver to the sideband that has been transmitted The heterodyning between the BFO frequency and the received sideband produces audio in the same manner as audio is produced for CW The noise limiter is a very useful circuit that is designed to assure that no noise or interference signal peaks will be higher than the wanted signal In the OFF position B is applied to the plates of VIO while the cathodes are grounded Since the tube sections are con
64. tions in the User s Manual Set the dial calibrator so that the hairline is in line with the mark on the top of the opening in the dial escutcheon Noting that the tuning capacitor plates are in the correct position for the low end of the band fully meshed tune for zero beat ignoring the dial frequency setting Loosen the left dial set screw hold the capacitor pulley to maintain zero beat then set the dial to exactly 14 MCS Now tighten the dial set screw again FIRMLY Turn the dial to gain access to the other set screw on that dial and tighten it firmly as well Repeat the same procedure for the right dial but using 21 MCS this time This completes the dial calibration procedure Check on other bands if dial calibration is far out or not possible to be attained RF alignment will have to be undertaken 48 2 SET CAPACITOR PLATES OUT OF MESH FOR IN STALLATION OF THIS KNOB SET CAPACITOR PLATES IN MESH PUSH ON POINTER THEN KNOB SET CONTROLS COUNTER CLOCKWISE SWITCH OFF IF SO EQUIPPED KNOB ALIGNMENT POSITIONS REMAINING SHAFTS HAVE FLATS IF KNOB ALIGNMENT 15 REQUIRED REPLACING POINTERS AND KNOBS STEP li 49 Alignment Procedure This Receiver has been carefully aligned at the factory and should never require any more than a touch up to retain the peak of its performance If alignment is necessary follow the instructions provided below with care For the alignment proce
65. ust the meter zero control at the rear of the Receiver chassis again for zero on the meter small screwdriver inserted through the chassis is required for this setting Do NOT adjust the meter sensitivity this requires a special technique and an input signal generator not normally available for home use Check carefully with the rear of chassis illustration to be sure of the location of the meter zero adjust GENERAL OPERATIN G PROCEDURE ANY MODE 1 2 Select mode 558 CW Set controls for normal operation as shown the mode illustration AVC RECEIVE SIDEBANDS SELECT KCS NOISE LIMITER off SLOT FREQ 5 KCS SLOT DEPTH centered BFO centered VERNIER TUNING zero Tune in station TUNING RANGE MAIN TUNING AF and RF GAIN ANTENNA TRIMMER use VERNIER TUNING for bandspread or for single side band intelligibility Readjust special controls for signal reception improvement noise or interference elimination etc NOISE LIMITER AVC CALIBRATE SIDEBANDS SELECT KCS BFO SLOT FREQ SLOT DEPTH 17 DIAL CALIBRATION TO USED WITH CALIBRATION CRYSTAL SEE CODE RECEPTION INSTRUCTIONS CLOCK TIMER SET TO ON OR AUTO IF DESIRED INSIDE LID PULL CLOCK SETTING KNOB TO REAR TO ADJUST TIME PUSH KNOB TO FRONT TO SET AUTO ON CONTROL ONCE BY AUTO TIMER SET MUST BE TURNED OFF MANUALLY BEFORE RESETTING CLOCK AM RECEPTION FOR ADDED SLOT RE JECTION SET FOR LEAST

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