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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 …
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.
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
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/
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. Another possible and much older filter implementation approach uses a combination of
Radio Interference Filters: All You Need To Know - CW ...
https://www.cwtouchkeyer.com/radio-interference-filters/
Radio interference filters are essential for your ham radio to protect it from unwanted external interruptions. Using these filters enhances the performance of your radio by allowing in your spectrum exactly what you need. Therefore, you must make sure that the ham radio you’re buying has a radio interference filter before making the purchase.
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