[Elecraft] 250 Hz and 400 Hz Filter Measurements

[Jim Brown]

On Sun, 18 Jul 2010 16:33:40 -0400, Joe Subich, W4TV wrote:

>I don't know that "benefit" is necessarily the correct word to use
>ton describe cascading.  The better term would be "effect."  The K3
>still exhibits benefits from the distributed filter design - the
>roofing filter protects the 2nd IF and DSP from overload, AGC
>pumping and IMD from strong signals outside the passband of the
>DSP filter.

Of course. But as contesters and DXers, we always look for more, and 
the cascading of filter responses can certainly be beneficial. 

>However, the roofing filter is not intended to contribute significant
>selectivity within the DSP passband.  That's not the function of a
>roofing filter

Yes, but the laws of physics does result in cascaded response.   Just 
because a tool is designed for one purpose doesn't necessarily mean 
that it can't be used for others. :) Repeating what I stated earlier 
-- when 100 big signals like W8JI, W4ZV, N6RO, and K1TTT are crammed 
into 15-25 kHz to work EU or JA, you can never have enough front end! 
And thankfully, I think all those stations are running K3s (I'm not 
sure about TTT). 

73, Jim K9YC