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K3S_Filters – Elecraft
https://elecraft.com/collections/k3s_filters
Filter Matching for the K3S/K3 - 200 Hz, 500 Hz and 2.7 kHz filter pairs only. Regular price. $39.95. 1kHZ Filter for the K3/K3S (CW/DATA), Kit. Regular price. $149.95 Sold out. 2.1 kHZ Filter for the K3/K3S (SSB) Regular price. $149.95 Sold out.
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 ...
K3S Transceiver – Elecraft
https://elecraft.com/products/k3s-transceiver
This allows Elecraft to provide roofing filters with bandwidths as narrow as 200 Hz for both receivers. Up-conversion designs have roofing filters typically 3,000 to 15,000 Hz in width. Each receiver has its own bus-switching mixer, narrow ham-band front-end filters, 32-bit I.F. DSP, low-noise synthesizer, and up to five crystal roofing filters.
K3 Enhancements and Mods and Tech Alerts – Elecraft
https://elecraft.com/pages/k3-enhancements-and-mods-and-tech-alerts
Tuning the K3's 60M bandpass filters for some Eu 60M bands. The K3 is supplied with its 60-meter band pass filter adjusted for the USA frequencies. This filter can be readjusted for optimum performance on the 60 meter channels for use in some European countries. Revision B March 28, 2008: K3 AF Output Mod Kit, Rev C
KX3 Operating Tips – Elecraft
https://elecraft.com/pages/kx3-operating-tips
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.
Mods, Notes & Alerts – Elecraft
https://elecraft.com/pages/mods-notes-alerts
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. This Operating Note is intended to highlight one of these features, the Audio Peaking Filter, or the APF, as it is generally called.
eHam.net
https://www.eham.net/reviews/detail/9442
I dug out my AF1 after reading about the popular Audio Peaking Filter (APF) DSP addition to many high-end transceivers. Elecraft recently included APF in their K3 transceiver which greatly pleased many people who owned other rigs with APF.
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