[Elecraft] K3 Filter Configurations and Explanations

[Arie Kleingeld PA3A]

Thanks to all for the comments. (I am using a 2x 400Hz and 2x 250 Hz
Inrad combo in my MP for selectivity at this time, and a  wiiiiiide
roofing filter)

The subject is very interesting to me since I expect my K3 sometime in
June.


How about this one for the K3:
2.7 standard
2.1 8-pole  SSB contesting
500 5-pole  CW contest running
200 5-pole  CW S&P especially 160m and 40m

The rationale: you don't need 8-pole since:
1. the interfering signals causing IMD don't have to be more than 20dB
down to stop the IMD.
2. If I use the DSP filtering, why add 8-pole filters if 1. applies
3. I read that the roofing filters can introduce IMD (because of steep
skirts or...? Is there a chance that 5-pole filters have less chance of
introducing IMD? Anybody can comment on this?)

I sure would like to hear the difference between 400 8-pole and 500
5-pole with fixed DSP bandwidth in a crowded strong signal band.

How about that?

73
Arie PA3A