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Elecraft K3 APF Audio Peaking Filter - YouTube
https://www.youtube.com/watch?v=y5wYkG6SrbE
A demonstration of the newly added APF feature in the Elecraft K3 firmware.
[Elecraft] K3/KX3 Operating Tip: APF (audio peaking ...
https://elecraft.mailman.qth.narkive.com/wsvnAq0j/k3-kx3-operating-tip-apf-audio-peaking-filter-for-weak-signal-cw-work
[Elecraft] K3/KX3 Operating Tip: APF (audio peaking, filter) for weak-signal CW work
Showing The New Audio Peak Filter of Elecraft K3 - …
https://www.youtube.com/watch?v=cuX099NqGt4
This is an example of how the new Audio Peak Filter firmware addition on Elecraft K3 help. Also you can see how well the Noise Blanker and Noise Filter also ...
Mods, Notes & Alerts – Elecraft
https://elecraft.com/pages/mods-notes-alerts
Both the K3 and KX3 have an APF control (audio peaking filter). APF can be extremely effective when you're trying to copy weak CW signals buried in the noise. Revision A September, 2012: Using APF with K3 and KX3: Elecraft's K3 radio has quite a few features to assist the avid DX and Contester to dig out weak signals across the entire HF bands.
How does audio peak filtering (APF) work? - KB6NU's Ham ...
https://www.kb6nu.com/how-does-audio-peak-filtering-apf-work/
The FT DX 1200 web page says: In the CW mode, the APF (Audio Peak Filter) function has an audio peak at the signal frequency; this improves the S/N and increases the readability of the CW signal. The APF peak frequency can be finely aligned. It works so well that I always have it on when operating CW. I want more details on how it works, though.
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