[Elecraft] Roofing Filters - An Empirical Test

[Vic Rosenthal K2VCO]

My K3 was originally set up this way, 400 Hz in the main and 2.8 kHz in 
the sub.

When working DX pileups with the main on the DX and the sub on the 
pileup, I definitely noticed the 'pumping' effect on the sub only. It 
was sometimes annoying when the DX was working a weak caller and the 
usual loud idiots were continuing to call.

On 5/12/2014 12:54 PM, Dauer, Edward wrote:
> I would be interested in knowing if anyone has done an empirical test and
> observed the difference directly.  Specifically, since the sub receiver is
> identical to the main receiver in every way, if someone has a K3 with, for
> example, a 400 Hz filter in the main but only a wider set in the sub, and
> then set the DSP bandwidth on both receivers to 200 Hz or so, what
> differences they actually noticed.  I have no doubt the theory and the
> engineering are sound - just curious what the difference sounds like in
> the field . . .
>
> Ted, KN1CBR

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