J,
What you are measuring is the voltage needed to bias the RF input MOSFETs to keep a given signal at the audio volume control.? This will vary with signal strength so that an S9+10 signal should take a higher AGC voltage to keep a given signal strength at the volume control.? It is measuring the feedback signal level, not the actual input signal.? This is how most level meters work as far as I know.
My testing of the AGC with both the Kit-Projects and the LM358 as input says that the scaling is what will drive the signal level.? The 2 setting for the low and the 200 for the highest seems too large of a spread.? I believe that it was more like 10 to 120 as the max in the implementation that I did.? Again, the ADC monitoring function of the Nextion display is the best way to verify what is going on for a specific implementation.? Just be sure to take into account the scaling that the software is doing (divide by 4).
73
Evan
AC9TU??
