[Elecraft] K3 receiver desensing on CW during contest

[Bill W4ZV]

K2MK wrote:
> 
> I thought it was interesting that recovery was noticeably slow on the DX 
> station's frequency when this was happening. However, under normal 
> conditions when US stations were calling directly on top of the DX
> station, 
> recovery was fast. Hence the ability to copy the DX station through the
> dits 
> when the QRM was on frequency.
> 

Mike this definitely sounds like desense but I'm surprised you experienced
it with only S8-9 signals.  I'm not sure what you mean about differing
conditions on and off the center frequency.  Desense will affect everything
inside the roofing filter.

What speed AGC were you using (F or S) and what were your AGC-F and AGC-S
CONFIG settings?  I NEVER use AGC-S on either CW or SSB and like at least
120 dB/sec for AGC-F.  Also, help your AGC do its job by not running RF GAIN
fully clockwise (as mentioned in my previous message).

73,  Bill

P.S.  As I said before my K3 worked extremely well coping weak signals in
the midst of massive ones on 160 this weekend.  I smiled when I saw the
following comment from OL0W(OK1DSZ):

"Only for fun, when the band was already closing, I decided to try what I
will
be able to work with QRP. Using longer callsign OK1DSZ and the power reduced
to
5W I spend about 10 minutes calling several east coast big guns. The award
for
the best ears goes to W4ZV, who was worked as easily as with the kilowatt
earlier in the night. K8PO and W2FU were worked with several repeats. The
others just kept CQing without any reaction with exception of K1TTT, who
apparently heard something, but not enough for the QSO."

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