[Elecraft] K3 receiver desensing on CW during contest

[wayne burdick]

Mike,

The K3 is virtually desense-proof, with a BDR of ~140 dB. But to take 
advantage of this, you need a narrow crystal filter -- the closer to 
the DSP bandwidth the better. This is exactly the situation that we had 
in mind when we designed the 200-Hz 5-pole filter. For CW pileups, you 
can't beat it.

What crystal filter were you using at the time?

Of course if the transmitting stations are "wide" due to key clicks, 
there may be situations where no amount of filtering can help (for any 
receiver). The DSP noise blanker and NR may be useful sometimes -- you 
might give this a try.

Wayne
N6KR

On Feb 22, 2009, at 4:45 PM, K2MK wrote:

> I had a great time with my K3 during the ARRL DX contest. I do S&P and 
> I was
> trolling around with my filter width at 50Hz. Absolutely outstanding. 
> The
> auto spot is equally outstanding.
>
> At 50Hz width it was quite clear that many stations call off frequency.
> Using RIT, I could see that it was typical for them to be 70Hz or more 
> away
> from the DX station but I could not hear them in my 50Hz passband. The 
> real
> problem was when one of them was S9 or greater. They completely swamped
> weaker DX stations.

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