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VEC-841K, KIT, TUNABLE CW AUDIO FILTER | MFJ …
https://mfjenterprises.com/products/vec-841k
This tunable SSB/CW Audio filter gives you constant output when bandwidth is varied, linear frequency control and tighter, smoother notch. Works with any receiver or transceiver. Plugs into phone jack. 1 watt amplifier for external speaker. Speaker and phone jacks. Speaker disables when phones are plugged in. Uses 12 VDC at 300 mA.
VEC-820K, KIT, SUPER CW AUDIO FILTER | MFJ …
https://mfjenterprises.com/products/vec-820k
The VEC-820K Electronic Kit gives an incredibly narrow 80 Hz bandwidth and extremely steep skirts with no ringing for razor sharp selectivity. It will pull CW signals out of interference in any ham radio band. You simply plug the kit into your radio phone jack to drive phones or between audio stages for full speaker operation.
K4ICY's Home Brew CW Audio Filter
http://www.k4icy.com/cwfilter.htm
Just search for "CW Filter" in Google. Kits are a great way to help you learn electronics. Operation: This is how I use the filter: I plug an audio patch cord (commonly found at Walmart) between the rig's phone jack and the input of the filter. If the rig's output is in stereo, then add an adapter.
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 ...
Elecraft AF-1 Audio Filter Kit - QRZ Now
https://qrznow.com/elecraft-af-1-audio-filter-kit/
by Richard, N4PBQ “ I’ve been working a lot of SKCC CW stations during the holidays and adjacent stations really interfere with my ability to use the vintage Ten-Tec Century/21.. 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 …
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.
Samuel Morse - Electro-Resales LLC
https://www.electroresales.com/samuel-morse.html
Kit build guide 600 Hz CW (Morse) Audio Filter This practice module is specifically for paddle keys providing the user with a convinient module for gaining proficiency in sending Morse code using a paddle key. dits and dahs are automatically generated and alternating dits/dahs are possible by squeezing the paddles together.
Simple Lowpass CW SCAF Filter - QRPGuys
https://qrpguys.com/simple-cw-scaf-filter
The QRPGuys Simple Lowpass SCAF Filter is an adjustable lowpass audio filter for cw that can be very helpful for a variety of receivers that lack the selectivity, or receive both sidebands simultaneously to narrow the audio pass band so individual cw stations can be heard more easily. It uses the MAX7427, 5th order, low pass, elliptic switched ...
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 ...
Four State QRP Group
http://www.4sqrp.com/HiPerMite.php
The HI-PER-MITE is a much improved version of Dave's HI-PER Audio Filter circuit that was published in the May 1994 issue of 73 magazine. If you wish to learn more about the genesis of the HI-PER Mite, and learn about important audio filter design parameters, click on the original 73 article link in the documentation section below.
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