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MFJ MFJ-752D DSP Audio Filters, MFJ752D - Ham Radio Outlet
https://www.hamradio.com/detail.cfm?pid=H0-001245
The MFJ-752D all mode dual tunable filter has variable bandwidth (40 Hz to almost flat); it eliminates noise and has a notch filter with a notch depth to 70 dB. You get input for two rigs (switch-selectable) a noise limiter, and more. Both units use 9 - 18 VDC or 110 VAC with the optional MFJ-1312D. Dimensions: 10W x 2H x 6D inches.
Switched capacitive audio filter projects • AmateurRadio.com
https://www.amateurradio.com/switched-capacitive-audio-filter-projects/
A little more research on the topic led me to “An Adjustable Audio Filter System for the Receiver” by Lloyd Butler VK5BR (Originally Published in Amateur Radio, March 1995). This is also a “roll your own” project, but gives some detail on the use of the filter in CW, RTTY, voice and other narrow bands.
A Passive LC Audio Filter For Amateur Radio Use
http://www.genebitsystems.com/david/AudioFilter/A_Passive_LC_Audio_Filter.pdf
External audio filters are sometimes used to improve the selectivity or enhance the audio quality of amateur radio receivers. These filters are usually implemented as op-amp active filters, switched-capacitor filters, DSP-based filters, or some combination thereof.
Audio and RF Filters - Universal Radio
https://www.universal-radio.com/catalog/filters.html
MFJ-752D Audio Filter: MFJ-784B DSP Audio Filter: MFJ-781 DSP Multimode Audio Filter: Par: UHFBP Military Band RF Filter: VHF-FM Scanner Listener RF Filter: Qik Zepp: RECV-CHK-BB Broadband Filter: RECV-CHK-LB Tropical Band Filter: Timewave: ANC-4 RF Noise Canceller : Please also see: Speakers Speakers with Filtration: Ham Accessories TVI & Low ...
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.
The Magica Audio Fil - N5DUX homepage
http://www.n5dux.com/ham/files/pdf/The%20Magical%20Audio%20Filter.pdf
The Magica Audio Fil A variable-frequency notch filter plus a peaking circuit will do wonders for your reception. And this project will almost build itself. A udio filtering is a well- known process for improving receiver selectiv- ity and many articles have FO = I 27 ~4fi ALL RESISTORS 0 I% Fig. 1. Original circuit. been written on the subject.
Active Audio Filters for Singal Processing and Control
http://n5dux.com/ham/files/pdf/Active%20Audio%20Filters.pdf
additional filter control network that is centered on the 1-kHz rnidband of the audio spec- trum. This network permits the $ midband to be boosted or cut by as much as 20 dB. g Graphic equalizers m (D The more sophisticated 2 graphic equalizer tone-control a system consists of a many paral- 5 lei-connected, variable-response 5
External Audio DSP Filter Module for SSB & CW, FT8x7 DSP ...
https://elekitsorparts.com/product/external-audio-dsp-filter-module-for-ssb-cw-ft8x7-dsp-filter
Features: Tiny in size, only 2.5″x1.3″, could be integrated into an existing active speaker 52 sets of CW filters, and central frequency adjustable Flexible SSB filter, lower cut down to 200Hz in 100Hz step, and higher cut up to 2700Hz in 200Hz step Low power consumption, only …
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