[Elecraft] K3 -Advice: how to configure APF for least ringing

[Bill W4ZV]

RobertG wrote
> I tend to shy away from the APF because its ringing seems to my ears to 
> be counter productive. Any advice/experience on how to set up and use 
> this feature for best results?

If you don't use APF you're missing one of the best features of the K3 for
weak signals.  I now use it nearly 100% of the time for QRP SOTA stations on
the higher bands or DX on 160m.  There are two keys for me to using it
effectively:

1.  Back off RF Gain until the signal is at the noise floor.  If you have
too much signal, you'll definitely create ringing.

2.  Use a relatively wide DSP/XFIL setting (e.g. I often use DSP=400 Hz with
a 200 Hz XFIL, yes I set the 200 Hz XFIL to enable at 400 Hz instead of 200
Hz).  In 160 contests, I sometimes use DSP=600 in a 500 Hz XFIL to better
hear off-frequency callers).  The relatively wider noise passband helps my
ears distinguish signal from noise and APF then greatly improves this
ability.

73,  Bill  W4ZV

P.S.  It goes without saying to carefully peak the APF on signal! (10 Hz
steps maximum or even lower for extremely weak signals).




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