I can assure you, Carl is right Mario.  Preamp on/off certainly affects 
S-meter reading but that's nothing to do with the AGC threshold control. 
 
73 
 
Bob, 5B4AGN, P3F 
 
 Marijan Miletic, S56A wrote: 
 
N4PY> The AGC threshold control does not change the S meter reading. 
 
I very much doubt that as S9 input voltage changes with preamp.
Circuit diags don't help much as meter is controlled by DAC.  
  
 
  
 
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