Hallicrafters SR-160, Technical Information

Page 1: ...SUPPLEMENTAL TECHNICAL INFORMATION FOR HALLICRAFTERS SR 160 AND SR 500 TRANSCEIVERS The little radios that could STUFF NOT IN THE BOOK By WD GOF August 2010 updated 9 30 2012...

Page 2: ...ollection of the full production SR series HF transceivers in operation in the shack There are 7 full production rigs in this series and I have restored many of each from the 100watt SR 150 to the 100...

Page 3: ...ION 10 THE S METER 11 S METER AMP TUBE SELECTION 11 AGC CONSIDERATIONS 11 MISC NOTES 12 TUNING FOR PLATE I DIP 12 RX RF AMP MOD 12 RIT CAL 12 SR 160 500 DRIFT 13 CAL RIT CIRCUIT CONSIDERATIONS 13 RIT...

Page 4: ...and it is a single conversion receiver The xtal filter in the 150 is 1650 KHz and 5200 KHz in the 160 It is a tri bander covering the complete 80 40 and 20 meter ham bands Power input of 150 watts for...

Page 5: ...tube and the 100 KHz crystal for the crystal calibrator were extra cost options installed in this set In comparing the schematics for the SR 500 and the SR 160 only a few differences are noted R92 is...

Page 6: ...input power was used Unfortunately they did nothing to the VFO and as the little tri bander accumulated hours it became drifty again Later in this writing we gonna fix that SR 500 finals Hallicrafters...

Page 7: ...120 HZ hum A keyed 2 wire cord should be used On the PS 150 the wide pin the neutral wire of the plug will connect to C202 The narrow pin connects to the fuse Use the same format for the PS 500 Capaci...

Page 8: ...he oscillators on freq individually then all else will fall into place Do not make any adjustments until the rig has been on for at least 30 minutes Do the VFO last to insure it is stable HETERODYNE O...

Page 9: ...t and output coils first Then tune the receiver antenna coils When aligning the antenna coils tune your signal generator to your VFO setting don t tune the VFO to the generator The procedure in the ma...

Page 10: ...arrier osc after passing through the lattice filter in the transmit mode Prior to performing T3 alignment 8 16 in the manual insure that the 5200KC oscillator is exactly on frequency After aligning th...

Page 11: ...l produce a meter reading of S9 pretty broad spec S METER AMP TUBE SELECTION V4B is the Meter amp Unfortunately as stated above the other half of the tube is the second IF amp The meter amp ckt is ext...

Page 12: ...A difference of just a few cycles can cause you to walk up or down the band When the RIT function is turned on the transmitter is still controlled by the CAL control but the receiver frequency is var...

Page 13: ...hy it takes longer for the 500 to stabilize after turn on If you operate in an uncontrolled environment such as field day in the fall chances are it ll never stabilize If you stick with the 1N963A the...

Page 14: ...directions from the mechanical center of rotation then R98 is at fault Now return the CAL control to the mechanical center and readjust the main tuning for 9 000Mhz Turn the RIT control ON Adjust RIT...

Page 15: ...on for the 0A2 150v regulator When you monitor the voltage at the input to the VFO you may see from 5 to 15 volt shift from TX to RX mode This will pull the VFO off frequency in the tx mode and cause...

Page 16: ...changes I re ran the test The short term random drift was gone All three rigs were then drifting in the upward direction from 10 to 30 HZ per minute and around 800 Hz to 1100HZ per hr SECOND CORRECTI...

Page 17: ...ct 0 1 volts of 5200 kHz into pin 7 of V5 Retune the RF gen for max audio If you get watt or better of audio out then the problem is in the second IF amp V4 If not go the STEP 4 STEP 4 Using a tee con...

Page 18: ...set up the VOX gain and delay The oscillation on this one turned out to be about 18 kHz which is out side the range of my old ears and the response of T5 So the tone did not appear in the speaker Why...

Page 19: ...3 MHZ AFTER TUNE UP TURN THE POWER OFF AND DO NOT RE ADJUST THE PRESELECTOR OR FINAL TUNE THROUGHOUT THIS PROCESS POWER DOWN AND REMOVE UNIT FROM IT S CASE AND REMOVE THE PA COVER 1 DISCONNECT THE PL...

Page 20: ...nd 3 16 wide Place a drop of DeOxit on the paper and slide it back and forth between the contacts Manually energize the relay and clean the normally open contacts as well A pair of hemostats simplifie...

Page 21: ...TECHNICAL SUPPLEMENT FOR THE SR 160 SR 500 by WD GOF August 2010 21 BEFORE CLEANING CLEAN CHASSIS...

Page 22: ...TECHNICAL SUPPLEMENT FOR THE SR 160 SR 500 by WD GOF August 2010 22...

Page 23: ...d at center of General Class bands BAND TEST FREQ SIG REQ FOR 500mw 80 40 20 Overall Sensitivity S N N A 1 0uv signal at the antenna terminal will produce a minimum 20db s n n BAND TEST FREQ SIGNAL LE...

Page 24: ...t CW power output with RF level set just to saturation level FREQ MIN SPEC AVG POWER 3 9mhz 190 W min 7 23mhz 220 W min 14 28mhz 200 W min SSB PEP power output mic gain set just at saturation SSB TX A...

Page 25: ...General Class bands BAND TEST FREQ SIG REQ FOR 500mw 80 40 20 Overall Sensitivity S N N A 1 0uv signal at the antenna terminal will produce a minimum 20db s n n BAND TEST FREQ SIGNAL LEVEL S N N MEAS...

Page 26: ...signal level not more than 5 mv rms shall produce the minimum specified SSB output at specified freq Mic gain set just below flat topping and should occur between 60 and 80 of rotation Flat topping o...

Page 27: ...Not wanting to risk a rig or run a power supply without a load I built this test fixture It was specifically built to test the PS 150 PS 500 and P 500 AC and DC power supplies However with the properl...

Page 28: ...TECHNICAL SUPPLEMENT FOR THE SR 160 SR 500 by WD GOF August 2010 28...