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

[Brian Hunt]

Here's another approach to using APF on weak signals in an uncrowded band.

- Turn on NR set to 5m3.  You can play with this but 5m3 seems to work 
best here.
- Set the DSP bandwidth to 1 KHz.   This is a good way to search for 
weak signals you can't hear otherwise.  The combination of NR and DSP BW 
drops the uncorrelated noise many dB.
- Turn on the APF and carefully tune the signal to the peak of the APF 
passband.  I typically use Spectrogram on a PC as a tuning aid 
throughout this whole process.
- Ride the AF and RF gain controls to minimize the ringing affect

Happy hunting!

Brian, K0DTJ