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Elecraft AF-1 Audio Filter Kit - QRZ Now
https://qrznow.com/elecraft-af-1-audio-filter-kit/
Its built-in audio filter is relatively effective if the band isn’t too crowded but if I’m working a station and others pop up within a 1kHz on either side I have a real hard time keeping track of which QSO to listen to. I wanted some relief from the relatively porous audio filtering provided by the old girl.
Elecraft AF1 Active Audio Filter and Amplifier – QSY Society
https://qsysociety.org/2010/12/18/elecraft-af1-active-audio-filter-and-amplifier/
The Elecraft AF1 is a versatile audio filter that can be used with any receiver or transceiver. It can improve intelligibility of CW, phone, or data signals, and is especially well suited to radios that have inadequate I.F. or audio filtering.
Elecraft AF1 Audio Filter User Manual
https://manualmachine.com/elecraft/af1audiofilter/1422526-user-manual/
The Elecraft AF1 is a versatile audio filter that can be used with any receiver or transceiver. It can improve intelligibility of CW, phone, or data signals, and is especially well suited to radios that have inadequate I.F. or audio filtering.
RAMSEY ELECTRONICS AF1 CW AUDIO FILTER KIT …
https://www.manualslib.com/manual/835259/Ramsey-Electronics-Af1-Cw-Audio-Filter.html
This filter uses a digital bandpass filter to knock out those unwanted signals. The adjustable center frequency and switchable bandwidth add some versatility to this hard working kit! • Utilizes "state of the art" switched capacitor bandpass filter IC's ! • Four selectable bandwidths - 750 Hz, 500 Hz, 250 Hz, and 100 Hz - all with digital accuracy.
AF1 Model – Elecraft
https://elecraft.com/collections/af1-model
Sort Sort Featured Alphabetically, A-Z Alphabetically, Z-A Price, low to high Price, high to low Date, new to old Date, old to new. AF1 Audio Frequency Filter. Regular price. $99.95.
Elecraft AF1 audio filter | QRZ Forums
https://forums.qrz.com/index.php?threads/elecraft-af1-audio-filter.687322/
The AF1 has a low pass and bandpass with two levels of filtering that cleans it up to the point that it's pleasurable to use for long sessions of CW It's also great for using with old rigs that have less than stellar bandpass filtering... Elecraft AF-1 Audio Filter for Ham Radio Watch later Watch on AA4OO, Jan 8, 2020 #1
Elecraft AF-1 Audio Filter for Ham Radio - YouTube
https://www.youtube.com/watch?v=le3zKNHXT_8
Audio filter providing passband filtering for Ham radio CW and other modes.
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