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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 ...
How does audio peak filtering (APF) work? - KB6NU's Ham ...
https://www.kb6nu.com/how-does-audio-peak-filtering-apf-work/
One of the cool CW features that I discovered this summer on my KX3 is audio peak filtering. Somehow, turning this on, brings a signal right up out of the mud. This feature is available on a number of mid-level and high-level rigs, such as the K3, IC-7610, FT DX 1200, and my new (to me) Flex 6400.
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.
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