5
Remove SH2 and SH1.
Measure RF and IF level at mixer
and compute mixer conversion
gain.
For UHF1/UHF2 radios:
Non gnd of C1900 and output of L503
For 7800 radios:
Input of C488 and output of L503.
For VHF radios:
Input of R316 and output of L503.
Mixer gain about
0-3dB?
No
Yes
13
8
Note: RF Test frequency used:
UHF1: 424.975MHz
UHF2: 485.075MHz
VHF: 154.275MHz
700: 769.0625MHz
800: 860.0625MHz
Measured with a High Frequency Probe for relative comparisons and troubleshooting
only. Actual S21 gain or loss may differ if the test point is not 50 ohms.
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