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Hallicrafters SX-117, Руководство по ремонту

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24 

 

7-1-2, AVC SCHEMATIC & VOLTAGE CHART 

 

 

RECHECK S-METER ZERO AND S9 SETTINGS. 
1, Warm up 15 minutes.  
2, Turn RF gain to zero. Adjust meter zero pot for 0 on the S-meter. 
3, Turn RF gain to max. Set generator for 5 microvolts output.  
4, On 80 meters tune up @ 3.900 MHz. Insure both preselector and tuning are peaked. 
5, Set generator for 50 microvolts output @ 3.900 MHz. 
6, Set AF gain for 500 mw out. Set factory gain pot for S9 on meter.  
 
AVC VOLTAGE CHART 

For this test 

NO SIG

 = RF GAIN control set at 0. 

S9

 = RF GAIN set to 10.

 

PIN #  

1 

2 

3 

4 

5 

6 

7 

8 

9 

NO SIG 

0.3 

3.7 

///////// 

6.3vac 

0.0 

///////// 

146.0 

0.0 

1.8 

S-9 

-4.1 

4.1 

/////////  ////////  /////////  ///////// 

145.0 

0.0 

1.78 

POSITIVE DC VOLTS UNLESS OTHERWISE NOTED 

 

 

Содержание SX-117

Страница 1: ...1 WD GOF Walt Cates...

Страница 2: ...2...

Страница 3: ...LLICRAFTERS SX 117 REPAIR MANUAL THIS DOCUMENT IS DESIGNED TO BE A COMPANION DOCUMENT TO THE HALLICRAFTERS OPERATING AND SERVICE INSTRUCTIONS COMMUNICATION RECEIVER MODEL SX 117 MANUAL Walter Cates WD...

Страница 4: ...4 ACKNOWLEDGEMENTS Many thanks to Jim K9AXN and Al W8UT who loaned me SX 117 s for the 4 months it took to write this document...

Страница 5: ...VOLTAGE CHART 16 5 3 MAIN CRYSTAL OSCILLATOR TEST 17 5 3 1 MAIN OSCILLATOR SCHEMATIC VOLTAGE CHART 17 5 4 AUXILIARY CRYSTAL OSCILLATOR TEST 18 5 4 1 AUXILIARY OSCILLATOR SCHEMATIC VOLTAGE CHART 18 5...

Страница 6: ...RT 30 8 PRODUCTION RUN DETERMINATION 31 8 1 CHANGES RUN 1 TO RUN 2 31 8 2 CHANGES RUN 2 TO RUN 3 31 8 3 CHANGES RUN 3 TO RUN 4 31 8 4 CHANGES RUN 4 TO RUN 5 31 9 APPENDIX 32 9 1 BULLETIN 1964 4 32 9 2...

Страница 7: ...n cost The mechanical design of the 115 was expensive and complicated Because of the improved mechanical design from an owner s standpoint the SX 117 is much simpler to maintain So overall in my mind...

Страница 8: ...o determine which production run your rig is Refer to section 8 to make this determination You should make upgrade changes to your rig before starting the maintenance activity It is highly recommended...

Страница 9: ...across a given load due to a change in input signal All of these measurement requirements are satisfied by a good audio power meter For my bench setup I have a standard inch phone plug which goes to a...

Страница 10: ...You need a range of 50KHz through 30MHz 2 3 5 TEST METER Here you can save a little money Nothing in the SX 117 or most of the vintage receivers of the era requires measurements of the four digit or b...

Страница 11: ...t The old HP 200 series are great and inexpensive 2 3 7 CAPACITIVE TUBE PICKUP The capacitive pickup tool is a metal sleeve that slides over a tube to sample any RF present It is used most commonly to...

Страница 12: ...e two must replace capacitors in the SX 117 One is the three section filter capacitor C117A B C The other is the cathode bypass capacitor for V12B C98 25uf 25v There are differing opinions about paper...

Страница 13: ...art provides the power supply measurement of an SX 117 that functions properly and meets all specifications It should be noted that the power supplies in equipment of this era were subject to quite a...

Страница 14: ...14 Voltage patten seen on anodes of CR3 and CR4 Pattern is identical on both anodes...

Страница 15: ...or and V13A crystal oscillator For the purpose of this document V3 will be referred to as the main crystal oscillator V13A will be referred to as the aux crystal oscillator 5 2 SSB CRYSTAL OSCILLATOR...

Страница 16: ...Hz on the counter Move the probe from the counter to the scope You should see a minimum of 5 0 vpp The amplitude of the signals on USB and LSB should be equal Slight offset errors can be corrected by...

Страница 17: ...ly you would adjust for exact frequency But unless you have a lot of spare xtals this is impractical 2 If the WWV xtal is installed turn the BAND SELECTOR to the WWV position repeat the process in ste...

Страница 18: ...cket 1 b Set the XTAL SELECTOR switch to position 1 c Power up any mode RF and AF GAIN at min d Connect scope probe to the junction of C57 and the terminal strip e The signal level should be 10vpp f M...

Страница 19: ...rotation Turn the FUNCTION switch to any mode Allow 30 minutes warm up stabilize time INITIAL PRESET Tune the main tuning dial to 300 Adjust L16 for a reading of 4 550MHz on the frequency counter TRA...

Страница 20: ...ED You will need an RF blocking probe It will be helpful if you switch on the CAL oscillator and tune for a good tone in the speaker If your RF blocking probe is working correctly you may shift the fr...

Страница 21: ...n in startup If it is not precisely on frequency adjust C301 for exactly 100 000KHz After adjusting C301 turn the calibrator off and back on to see where it stabilized Readjust if necessary Turn the R...

Страница 22: ...ed fault in V8A T5 or T6 or associated passive components 5 2 1 7 1650KHz V7 pin 1 200 uv 10X 500mw Passed proceed to step 8 Failed fault in V7 T4 or associated passive components 7 6 From this point...

Страница 23: ...F GAIN set to zero the AVC does not fall between 0 20 and 0 65 vdc there is a fault Set up the receiver on the 80 meter band and tune up in LSB mode at 3 900 MHz 1 Allow 15 minutes warm up 2 Turn RF g...

Страница 24: ...tput 4 On 80 meters tune up 3 900 MHz Insure both preselector and tuning are peaked 5 Set generator for 50 microvolts output 3 900 MHz 6 Set AF gain for 500 mw out Set factory gain pot for S9 on meter...

Страница 25: ...7 2 1 S METER SCHEMATIC VOLTAGE CHART Warm up 15 minutes On 80 meters tune up 3 900MHz Recheck S meter calibration at zero and 50microvolts input Inject 50 microvolts into J2 Turn RF Gain to max Tune...

Страница 26: ...75 KHz IF AMP SCHEMATIC VOLTAGE CHART REF B 172V SECONDARY B 149V AND AUXILIARY B 146V MEASUREMENTS TAKEN WITH NO SIGNAL INPUT PIN 1 PIN 2 PIN 3 PIN 4 PIN 5 PIN 6 PIN 7 RF GAIN MAX 0 0 79 6 3vac 0 14...

Страница 27: ...re special ordered from a crystal manufacture Good luck with that one So if you get a perfect zero beat adjustment great If you don t and the error is slight you will most likely never detect it in no...

Страница 28: ...ENTS TAKEN WITH NO SIGNAL IN PIN 1 PIN 2 PIN 3 PIN 4 PIN 5 PIN 6 PIN 7 1 23 2 35 6 3vac 0 145 81 8 2 35 7 7 SECOND MIXER V5 SCHEMATIC VOLTAGE CHART REF B 172V SECONDARY B 149V AND AUXILIARY B 146V MEA...

Страница 29: ...PIN 4 PIN 5 PIN 6 PIN 7 0 1 76 0 6 3 vac 152 79 1 76 7 9 FIRST MIXER V2A SCHEMATIC VOLTAGE CHART REF B 172V SECONDARY B 149V AND AUXILIARY B 146V Measurements taken with no signal in at the antenna RE...

Страница 30: ...ND OUTPUT V12A B SCHEMATIC AND VOLTAGE CHART REF B 172V SECONDARY B 149V AND AUXILIARY B 146V MEASURMENTS TAKEN WITH AF GAIN AT MIN PIN 1 PIN 2 PIN 3 PIN 4 PIN 5 PIN 6 PIN 7 PIN 8 PIN 9 0 287 0 172 6...

Страница 31: ...in this There seems to be no change in function or performance so this change is not recommended 8 2 CHANGES RUN 2 TO RUN 3 This production run change is quite extensive Refer to section 9 5 for detai...

Страница 32: ...32 9 APPENDIX 9 1 BULLETIN 1964 4...

Страница 33: ...33 9 2 ENGINEERING CHANGE C15E...

Страница 34: ...ND RECEIVER SX 117 TEST SPECIFICATION The following is the mid production test specification It does not reflect the improvements in performance that occurred over the lifetime of SX 117 production La...

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Страница 46: ...46 9 4 SERVICE BULLETIN RUN 5 CHANGE...

Страница 47: ...47 9 5 ENGINEERING CHANGE C 169 NOTE C level units will have the serial 117002 XXXXXX...

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Страница 50: ...650KHz to determine center of IF passband Set generator at center of IF passband Adjust top bottom of T3 T4 for maximum audio output 3 Pin 2 of V2 6 050 MHz 1000 cycles 30 mod 80 Meters AM 500mw 2 5KH...

Страница 51: ...LECTOR to 3 5 d Set preselector to 3 On the inner 1 to 10 scale e Connect generator to antenna input f Set FUNCTION to LSB g Adjust A F GAIN for 250 milliwatts audio out Adjust L5 RF amp grid tuning a...

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