[Elecraft] K3: APF effectiveness

[Barry N1EU]

What you're describing ("hear signals that aren't even there") sounds to me
like the APF is working just as intended.  You're hearing faint ringing at
your sidetone frequency when no signal is present.  When a signal is present
and tuned in, it will have precisely that same tone but will pop further out
of the noise than that "phantom" signal.  It just demands a little practice
and patience along with fine tuning.

If someone wants a lower Q APF with less gain, they should try a dsp width
of 50hz without APF.

73, Barry N1EU


Ralph Parker wrote:
> 
>>...perhaps less gain and a little wider BW
>>or give the user the tools to do it ourselves.
> 
> I was thinking exactly that myself last night on 160m - no problem with
> the
> bandwidth, but I'd gladly give up a db or two of APF gain to reduce the
> ringing.
> Because of the ringing, I can hear signals that aren't even there!
> 

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