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Elecraft K2 KAF2 filter alignment – K0EMT's amateur radio blog
https://dbbear.com/radio_blog/index.php/2020/10/18/elecraft-k2-kaf2-filter-alignment/
Elecraft K2 KAF2 filter alignment. I recently had my Elecraft K2 open doing some work on it. I thought I would take the opportunity to align the KAF2. I don't have a spectrum analyzer. However, I was able to use a browser based audio spectrum analyzer. I connected the output of the K2 to the microphone in line of the station computer.
Modified Build of Elecraft KAF2 Audio Filter for the K2
https://www.qsl.net/ve3sma/ModifiedKAF2.pdf
The KAF2 audio filter might cure these ills as it includes a low pass filter for hiss reduction and two selectable stages of narrow audio filtering. But as I looked into it, I found some conflicts with my operating interests: (1) The low pass filter, which is always engaged (unless you take the top off the rig and flip a switch), appeared to
Manuals & Downloads – Elecraft
https://elecraft.com/pages/manuals-downloads
Introduction to the Elecraft K4: REV C2 (6-9-21) 11.64 Mb: K4 Rear-Panel, Reversed: ... KAF2 Manual KAF2 Audio Filter / Real Time Clock Manual: Rev A (8/30/2001) 277 Kb: ... AF1 Audio Filter Assembly and Operating Manual ...
KAF2 Low Noise Audio filter and Real Time ... - QRPproject
https://www.qrpproject.de/UK/elecraft_kaf2.htm
Audio Filter The KAF2 includes a passive, balanced low-pass filter (LPF) that significantly attenuates splatter, carriers, and wideband I.F. noise above 3 kHz. It's especially useful on quiet bands, with the preamp off, or when using small, low-noise receiving antennas. It completely eliminates the hiss sometimes heard when using hi-fi headphones.
Elecraft KAF2 Low Noise Audio Filter and Real Time …
https://www.pinterest.com/pin/427630927101416347/
Sep 26, 2016 - Find many great new & used options and get the best deals for Elecraft KAF2 Low Noise Audio Filter and Real Time Clock for The K2 at the best online prices at eBay! Free shipping for many products!
G3VGR's Elecraft K2 Page
https://www.qsl.net/g3vgr/k2.html
The KAF2 Audio Filter and Real Time clock is the last Elecraft option to be fitted to my K2: The K2 with the 4 options installed. The ID plate from WB2ART can be clearly seen: G3VGR giving a talk/demo of the K2 at LEFARS club: Front view of completed K2 #4783 (Dec. 2005) Rear view of completed K2 #4783: Original home-made AF Amplifier PCB.
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