[Elecraft] K3: APF... wow!

[Brian Machesney]

The K3's APF feature formalizes behavior that I used to implement by mixing
the audio from the main and second RX with the two receivers set to
different IF and DSP bandwidths. The first few times I tried the APF, I was
not impressed; I thought (mistakenly) that it was not "meant" to work with
the 8-pole 400Hz IF filters in my K3.

Boy, was I ever wrong! I followed the suggestions that Eric posted last week
- especially using 1Hz FINE tuning - and APF has, indeed, allowed me to hear
signals that were inaudible before. In particular, it has allowed me to work
VP8ORK from 160m down to 10m, raising copy from "ESP" to "workable" in many
cases.

-- 
73 -- Brian -- K1LI