[Elecraft] [K3] Questions about ARRL review

[Toby Deinhardt]

Hi Lyle,

> If you look at the larger values of attenuation (134 vs 115, or 113 vs 
> 93) the result is mostly due to the difference in shape factor of the 
> roofing filter.  Expressed differently, an 8-pole filter is likely to 
> have a steeper slope in its selectivity curve than a 5-pole filter.

But on the other hand, AFAIK, an 8 pole filter will tend to be more 
likely to create higher distortion of the Nutzsignal due to group and 
phase delay, ringing, etc. at each pole. So more poles is not always 
better than less poles.

vy 73 de toby