[Elecraft] K3 receiver desensing on CW during contest

[Barry N1EU]

Peter Wollan-2 wrote:
> 
> Aha.  It sounds like the "desense" problem arises when the DSP filter
> is narrower than the roofing filter.  A strong station within the
> roofing passband but outside the DSP passband will shut down the
> receiver through AGC.
> 
> I think we all misled ourselves by the impression that desense was
> impossible in the K3.  It's working just as it ought -- but operators
> need to widen out the DSP to the full width of the roofing filter,
> when there are strong stations every few Hz.  A bit counter-intuitive,
> perhaps.
> 

Correct me if I'm wrong, but a strong station within the
roofing passband but outside the DSP passband will NOT shut down the
receiver through AGC unless the strength exceeds s9+25dB (when hardware AGC
kicks in due to ADC dynamic range limits).

73,
Barry N1EU
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