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SG165 SETTINGS
Function
Speakerload
Power Range
Left and Right
400 Hz
Pilot 19 KHz
FM Modulation
AM Modulation
RF Tuning
Marker Height
AM/FM IF Rocker
Microvolt Output
Microvolt Output
Adjustment
EQUIPMENT NEEDED
Scope
Frequency Counter
RF Voltmeter
POWER SUPPLY
1.
Measure voltage on positive lead of C105.
2.
Adjust R113 for a negative voltage of equal value as measured at the negative lead of
400 HZ SINE WAVE
1.
Connect scope to "all signal output" of SG165.
2.
Adjust R375 for frequency of 400 Hz.
3.
Level should be about 30 VPP with direct lead.
4.
Switch to 400 Hz square wave.
5.
Signal should be of same frequency and amplitude as sine wave.
SG165 CALIBRATION PROCEDURE
-
400 Hz Sine Wave
-
Speakers
-
Separation Test
-
Off
-
0
-
IHF MPX
-
0
-
Fully CCW
-
Mid-scale
-
Mid-scale
-
X1000
-
Fully CW
-
SC61
-
FC71
-
Boonton
1
C106.
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Summary of Contents for Sencore SG-165
- Page 1 SG165 CALIBRATION PROCEDURE SG165 SETTINGS Function 400 Hz Sine Wave Speakerload Speakers Power Range Separation Test Left and Right 400 Hz Pilot 19 KHz FM Modulation IHF MPX AM Modulation RF Tuning Fully CCW Marker Height Mid-scale AM/FM IF Rocker Mid-scale Microvolt Output X1000...
- Page 2 SG165 CALIBRATION PROCEDURE EXTRA CRYSTAL Switch to extra crystal. Output should be nothing unless crystal is in the SG165 crystal holder. 67 KHz Switch to SCA 67 KHz. Adjust L307 for frequency of 67 KHz. MPX SIGNAL Switch to Max signal. Turn left 400 Hz on.
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Page 3: Frequency Calibration
Connect oscilloscope to bare wire near TR305 and adjust L305 for 100 KHz output on scope. SG165 CALIBRATION PROCEDURE Connect Channel A and B scope probes to molex Pins 2 and 3 of 300 board. Push vector on scope and switch A and B volts per division to same setting, adjust timebase for closest thing to a circle. - Page 4 Connect all signal output to 1 Meg load on FC71. Set dial for 500 KHz. SG165 CALIBRATION PROCEDURE Adjust L302 for 500 KHz on FC71. Set dial for 1600 KHz. Adjust C305A for 1600 KHz on FC71. Check 1000 KHz for frequency. NOTE: One calibration may affect the other somewhat.
- Page 5 Switch AM modulation switch to 30%. AM should be modulated on scope. Switch to FM RF. Connect all signals out to 50 ohm input on FC71. Set dial for 88 MHz. SG165 CALIBRATION PROCEDURE Adjust L308 for 88 MHz on FC71. Set dial at 108 MHz.
- Page 6 Switch pilot 19 KHz to 5%. Pilot light should remain on. Switch pilot 19 KHz to 0 and pilot light should disappear. End of test.