[Elecraft] K3 in 160 contest

[Vic K2VCO]

Gary NL7Y wrote:
> 
> I've found that with the 200Hz filter enabled in both of my receivers via
> diversity reception mode, BW set to 150 or less, that weak sigs pop out of
> my high S5 city noise floor like the best audio APF enabled rigs I've owned
> (many). Elecraft has a Genie of sorts helping us on CW, and no filter
> ringing that I care to mention.

Are you sure that the 200Hz filter had anything to do with this? Maybe you would have had 
the same results with a 400 or 500 Hz filter with the DSP bandwidth at 150 or less.

I've seen several comments like this, but keep this in mind: with the DSP bandwidth set to 
150 Hz the only time you will notice a difference between the 200 and 400 Hz filters is 
when there is a S9+30db signal that is more than 100 and less than 200 Hz away from the 
desired signal.

I made some simplifying assumptions in the above, but you get the idea.

Put another way, you would not notice any difference in performance between a K3 with 
*only* the supplied 2.7 kHz filter and one with a 200 Hz filter unless there is a signal 
loud enough to activate the hardware AGC (about S9+30dB) which is within the filter 
bandwidth but outside the DSP bandwidth.

-- 
73,
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco