400 SERIES MAINTENANCE MANUAL
Page 5-21
P/N 190-00140-05
Rev. C
11.
Verify the DMM reading is greater than the reference AGC voltage.
127.002778 MHz ______VDC (NLT AGC reference voltage)
126.997222 MHz ______VDC (NLT AGC reference voltage)
12.
Adjust signal level to 10 mV.
127.00737 MHz ______VDC (NGT AGC reference voltage)
126.99263 MHz ______VDC (NGT AGC reference voltage)
5.7.2.15
Volume Control (Audio Output)
1.
Enable compression (see Paragraph 5.7.2).
2.
Apply a 100 µV, 118.5 MHz, 1 KHz tone modulated 30% signal to the unit.
3.
Select 118.500 MHz.
4.
Monitor the audio output.
5.
Turn the volume control fully clockwise.
6.
Verify a minimum of 7.07 Vrms at 500 ohms.
Audio Output (Measured between J6-16 and 17) ________ NLT 7.07 Vrms
7.
Turn the volume control fully counterclockwise (not past the detent OFF position).
8.
Verify a maximum of 22 mVrms.
Audio Output (Measured between J6-16 and 17) ________ NGT 22 mVrms
5.7.2.16
Audio Distortion Test
1.
Apply a 10 mV, 85% modulated signal.
2.
Measure the receiver audio distortion. Set volume for rated audio.
350 Hz ______ < 25%
1000 Hz ______ < 15%
2500 Hz ______ <15%
Содержание GNC 420
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