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Page 4-34
GNS 400W Series Maintenance Manual
Rev. A
190-00356-05
Image Frequency
169.800 mHz
Half IF Frequency
137.7 mHz
Signal Pin
Signal Name
Reference Pin
Reference Name
Load
J2-2
COMM IF AGC
TEST
J2-21 GROUND
None
Set the channel spacing to 25 mHz.
Set the signal generator to the following:
•
Carrier Frequency: 127 mHz
•
Output Level: 1 µV
•
Modulation: 30%
•
Audio Frequency: 1 kHz
Measure the reference IF AGC voltage.
Set the signal generator to the following:
•
Carrier Frequency: 169.8 mHz
•
Output Level: 10 mV
•
Modulation: 30%
•
Audio Frequency: 1 kHz
Measure the IF AGC voltage.
Set the signal generator to the following:
•
Carrier Frequency: 137.7 mHz
•
Output Level: 10 mV
•
Modulation: 30%
•
Audio Frequency: 1 kHz
Measure the IF AGC voltage.
Verify (the reference IF AGC voltage) – (the measured IF AGC voltage) > 0.
