05-31-2026, 04:12 PM
Checking the AVC voltage to its source may help you identify where the -7V is coming from. That much of a negative voltage will not allow you to hear the normally weaker signals a good working radio does. This likely needs to be fixed before proceeding.
Once back to normal AVC, my suggestion is to turn down the signal generator until the audio disappears, the bring it up till the audio is clear but no more than that. Then wait and listen to what happens. Normally very strong stations could possibly give you a mv of signal, but most are in the uv range.
When you align the IF and RF stages, normally you only want enough signal to be heard and can be measured while tuning. This insures no AVC action is skewing your readings.
Swamping the radio with too much signal is not the answer in my opinion.
Food for thought.
Once back to normal AVC, my suggestion is to turn down the signal generator until the audio disappears, the bring it up till the audio is clear but no more than that. Then wait and listen to what happens. Normally very strong stations could possibly give you a mv of signal, but most are in the uv range.
When you align the IF and RF stages, normally you only want enough signal to be heard and can be measured while tuning. This insures no AVC action is skewing your readings.
Swamping the radio with too much signal is not the answer in my opinion.
Food for thought.
Tony
“People may not remember how fast you did a job, but they will remember how well you did it”
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