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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.
Low Cost open source audio DSP filter for Ham Radios ...
https://radioaficion.com/news/dsp-audio-filter-low-cost/
Low Cost open source audio DSP filter for Radio Hams. It is released as a building block for anyone who wants to design or customise their own audio filters. It is different from commercial offerings because it is. Cheap; Can contain multiple filter profiles based on hi pass, lo pass, band pass or band stop; You can define the filter points in Hz within the code
DIY DSP audio filter for Radio Hams - PJRC
https://www.pjrc.com/diy-dsp-audio-filter-for-radio-hams/
DIY DSP audio filter for Radio Hams Forum user gi1mic has released a DIY DSP audio project for radio hams. It takes advantage of the processing power of the Teensy and implements finite impulse response (FIR) filters that are configurable in software and default to an impressive 200 taps. DIY $19 DSP board for the FT-817. Watch later Watch on
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. Another possible and much older filter implementation approach uses a combination of
LogiKit SCAF-1 – Bandpass Filter - Ham Supply
https://www.hamsupply.com/logikit-scaf-1-noise-filter/
The new SCAF-1 filter from Ham Supply / Idiom Press makes your radio listener friendly, whether you are an SSB or CW operator. Using a modern but little known technology called SCAF filtering, the SCAF-1 is an active audio low pass filter offering user control of the filter cut-off frequency, yielding a stunning 96dB per octave roll-off of signals above the cut off frequency, and no white …
Switched capacitive audio filter projects - AmateurRadio.com
https://www.amateurradio.com/switched-capacitive-audio-filter-projects/
The integrated circuit at the heart of the NESCaf is made up of two CMOS active filters. These filters are extremely configurable (low pass, band pass, notch etc). We have chosen to set up both filters as Butterworth band pass filters and to cascade the filters.
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 Pass Filters
How does audio peak filtering (APF) work? - KB6NU's Ham ...
https://www.kb6nu.com/how-does-audio-peak-filtering-apf-work/
The FT DX 1200 web page says: In the CW mode, the APF (Audio Peak Filter) function has an audio peak at the signal frequency; this improves the S/N and increases the readability of the CW signal. The APF peak frequency can be finely aligned. It works so well that I always have it on when operating CW. I want more details on how it works, though. I wouldn’t …
QRPGuys Active 600Hz Audio Filter - QRPGuys
https://qrpguys.com/qrpguys-active-600hz-audio-filter
The QRPGuys Active 600Hz Audio Filter is a fixed 600Hz bandpass filter with a narrow bandwidth for cw reception. It uses a TL072 JFET op amp IC and LM386 amplifier IC. It is used with a receiver to improve signal readability in crowded band conditions that can be very helpful in receivers or transceivers that have limited filtering or are receiving both sidebands …
K4ICY's Home Brew CW Audio Filter - Design / Amateur Radio
http://www.k4icy.com/cwfilter.htm
response filter the incoming audio at around 750 Hz. The "shoulder" of the response curve is wide enough to allow (700-800 Hz) If you have a different "Side tone" on your rig than 750 Hz, you will first need to zero-beat the signal in bypass mode first, use the RIT on your receiver to "fake" the received tone match 750 hz.
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