I use an audio spectrum display - Spectrogram - to fine tune a barely there 
weak signal. Set tuning rate to 1 Hz - the APF peak is less than 10 Hz. Set the 
frequency cursor in Spectrogram to your pitch frequency. Set the DSP bandwidth 
wide so the NR works effectively ~ 700 Hz. Use NR mode ~m5-3 so the APF has 
some unprocessed signal to work on. It takes practice but works. 

73,
Brian, K0DTJ

> On Feb 11, 2020, at 18:05, [email protected] wrote:
> 
> Would anyone be willing to offer suggestions/recommendations?
> Your setup of the K3s to maximize weak signal cw reception?
> I especially would like to figure out how to maximize the APF without ringing.
> 
> Sincere thanks
> Duane
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