[Elecraft] K3 / RF gain - S meter issue - Similar issue

[Al Lorona]

This would be easy to test. Normally, 'hardware AGC' kicks in at an input signal level of -46 dBm or so. This point is essentially independent of the AGC THR and SLP settings. See if your K3 varies from this data point anomalously.

Al  W6LX



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In my opinion based on inspection of the schematic, the issue resides in the fet 
post-filter amplifier that is controlled by the "hardware" AGC (and manual "RF" 
gain control)  The specs on this device are very loose, IIRC, Gm can vary 2:1.  
Thus the response of this fet to AGC/RF gain varies from radio to radio 

Wes  N7WS