[Elecraft] K3/KX3 Operating Tip: APF (audio peaking, filter) for weak-signal CW work

[G3XDY]

I find the K3 APF invaluable for weak signal work on the microwaves. In 
the microwave NAC contest last night I worked three stations over 600km 
on 2.3 and 3.4GHz by aircraft reflection, and the APF really helped pull 
the weak signals out of the noise. I generally use 1kHz width for CW and 
my ears for the rest of the filtering, but the APF makes a really big 
difference on those signals that seem just too weak to copy.

The only disadvantage is the hold rather than tap to switch it on/off - 
I often find I end up having to reset the filter width when I try to 
cancel the APF .

-- 
73

John G3XDY
K3 #0689