[Elecraft] CW Pitch Resolution

[Bill W4ZV]

RobertG wrote
> Bill...
> Every time I attempt to use APF I encounter so much ringing that it's 
> more or less unusable. I'd appreciate any hint that you might have about 
> "taming" this feature for use. Thanks.

Hi Robert,

Reduce the gain and narrow the XFIL/DSP bandwidth such that the desired
signal pops out of the noise.  I generally don't use APF unless all signals
in the passband are relatively weak.  Ideally you don't want anything in the
passband except band noise and the signal of interest.  This may sound
counterintuitive but IF QRM ALLOWS, try a relatively wide XFIL/DSP bandwidth
(e.g. 400 Hz).  I find this helps your brain/ears have better discrimination
between the signal and noise.  If you narrow XFIL/DSP too much, you may
magnify ringing.

Contrary to what I thought when I first tried APF, I now use it most of the
time, but I hasten to add that "most of the time" I'm listening to very weak
signals (e.g. 160m DX or QRP SOTA ops on higher bands).  When I activate
SOTA summits, I *REALLY* miss APF on my K2 and this feature alone may
eventually push me over the edge to a KX3.

73,  Bill




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