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Easy Audio Bandpass Filter Kit - QRP Kits
http://www.qrpkits.com/files/AFBPF_Manual_V4_20160707.pdf
The Audio Frequency Band Pass Filter kit from qrpkits.com provides A basic audio filter kit with preamp, op-amp filter and LM386 audio amp to drive headphones or speaker. It has a peak in audio response that is tunable from approximately 300Hz to 2Khz and has a bandwidth of approximately 500Hz. It is designed to provide improved audio filtering and amplification to CW
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.
Audio Filter Kit - MTechnologies
https://www.mtechnologies.com/misc/filter.htm
Super CW Filter Kit with 1W Audio Amp. $29.95. The Vectronics Super CW Filter kit is an inexpensive way to add sharp, narrow filtering to any transceiver or receiver. It works on the audio output from the receiver-- just connect it to the headphone or speaker jack.
KITS - new home
http://www.midnightscience.com/kits.html
Passive Audio CW Filter Kit. Our Passive Audio CW Filter Kit was inspired by our enthusiasm for non-powered – no batteries or power supplies required – electronics. The kit includes parts for a 250 Hertz bandwidth and one of the following center frequencies: 500, 600, 700 Hz.
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
Get yourself a Funtronics FADS-02 external audio filter module. The QSOs will get much more straight-forward with this tiny external audio DSP module. The FADS-02 is an audio digital filter which is designed to eliminate and filter out the unwanted noises and interferences in a SSB or CW QSO by using the software algorithms called DSP.
Four State QRP Group
http://www.4sqrp.com/HiPerMite.php
The HI-PER-MITE is a HIgh-PERformance SMALL audio filter. It is designed to be very versatile, have low parts count, be inexpensive, yet provide outstanding performance. This is a flexible design that can be used as a stand-alone unit driving headphones, earbuds, or speakers, or it can be easily integrated into an existing receiver needing additional CW filtering (see manual for …
DSP Audio Filter - Free download and software reviews ...
https://download.cnet.com/DSP-Audio-Filter/3000-2170_4-75717125.html
By WD6CNF. DSP Audio Filter is a program designed to enable you to filter the audio input (microphone) with one of several filters and then output it to the computer speakers. It has different ...
K4ICY's Home Brew CW Audio Filter
http://www.k4icy.com/cwfilter.htm
This little accessory will add the much needed narrow band filtering toyour audio radio's output. The circuit used is an active RC driven filter using Op amps and ispre-constructed for a set frequency range. The circuit was inspired from the ARRL Extra Class study manual's(Volume 8) pages on active filters.
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 Audio Filter Modules | Digital Signal Audio Signal ...
https://www.sotabeams.co.uk/audio-filters-and-more/
Amplifier and Enclosure Kit for LASERBEAM-DUAL Filters (filter included) £49.95 (Inc. Tax) £41.62 (Ex. Tax) Out of stock. Quick view Compare.
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