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23. Adjust T31O, T311, T312, T313, and T314 for
maximum DC voltage at pin 5 of U304.
24. Set the signal generator output to 1 mV and
adjust T315 for maximum audio at pin 7 of
U305.
25. Adjust VR304 for 140 mV of audio at pin 7 of
U305.
26. Set the signal generator output to 1
~
V and
adjust VR303 to just extinguish the number 2
LED on the front panel.
27. Set the signal generator to the channel 3 fre-
quency.
28. Adjust T316, TIl?, T318, T319, and T320 for
_ maximum DC voltage at pin 5 of U306.
29. Set the signal generator output to 1 mV and
adjust T321 for maximum audio at pin 7 of
U307.
30. Adjust VR306 for 140 mV of audio at pin 7 of
U307.
31. Set the signal generator output to 1
~V
and
adjust VR305 to just extinguish the number 3
LED on the front panel.
32. Set the signal generator to the channel 4 fre-
quency.
33. Adjust T322, T323, T324, T325 and T326 for
maximum DC voltage at pin 5 of U309.
34. Set the signal generator output to 1 mV and
adjust T327 for maximum audio at pin 7 of
U31O.
35. Adjust VR308 for 140 mV of audio at pin 7 of
U31O.
36. Set the signal generator output to 1
~
V and
adjust VR307 to just extinguish the number 4
LED on the front panel.
Receive Board - 750309
Equipment Required:
D
Signal Generator
D
Sensitive RF Voltmeter
D
Audio Distortion Meter
D
Spectrum Analyzer or VHF
Monitor
D
AF Voltmeter-
D
SINAD Meter
lA Version 1: Place the RF voltmeter probe tip
inside the top of L309 and adjust VC307 for a
peak indication.
1B Version 2: Place the RF voltmeter probe tip
inside the top of L313 and adjust VC307 and
VC308 for a peak indication.
2. Connect the signal generator to a shott piece of
wire and set it to the oscillator frequency as
shown in the chart below:
3. Using either a spectrum analyzer or a VHF
monitor, adjust L307 for a zero beat.
Y30I
Oscillator
CHI
CH2
CH3
CH4
Marking
171 R905
182.605
171.905
171.045
170.245
169.505
207 R800
218.5
207.800
207.425
206.800
206.000
213 R800
224.5
213.800
213.425
212.800
212.000
3-11
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