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K4ICY's Home Brew CW Audio Filter
http://www.k4icy.com/cwfilter.htm
Home Brew CW Filter: If you are just getting into CW and you are starting off with an older radio or QRP set. Newer radios may come equipped with filters for narrowing the audio passband or digital signal processing (DSP) to clean up unwanted noise. But you may be faced with trying to pick out a wanted signal from a swamp of others.
CW Audio Filter – Rob's Blog
https://robs-blog.net/2015/12/15/cw-audio-filter/
CW Audio Filter. When it comes to direct conversion receivers, to get good selectivity you need to use good audio filters. There is no IF so you cannot use narrow crystal or collins type mechanical filters to narrow up the bandpass and filter out all those close by signals. For CW use this is important, because you might have 20 different ...
Audio filters for CW - k4lxycw.wixsite.com
https://k4lxycw.wixsite.com/blog/post/audio-filters-for-cw
Audio filters for CW. Wolfwave. Peak in graph indicates that signal is tuned to sidetone frequency. Box with jacks, upper right, is the transmit bypass circuit. I admit I've had a bit of an obsession with audio filters. This is partly because I’ve worked with a variety of vintage rigs and with QRP rigs, both of which often have fairly limited ...
CW Filter - 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. Connect your headphones or a speaker on the output of the filter and enjoy QRM ...
Four State QRP Group
http://www.4sqrp.com/HiPerMite.php
An Active Audio CW Filter Designed by . David Cripe, NMØS Click to join the hi-Per-Mite Yahoo Group: Click for larger image. Kitted and Offered For Sale By The Four State QRP Group. 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 ...
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 ...
Samuel Morse - Electro-Resales LLC
https://www.electroresales.com/samuel-morse.html
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.
Active R/C Filter Design 80M Unichip Plus DC XCVR
http://www.azscqrpions.org/Tuthill_filter_presentation_08-09.pdf
• Sharper cw audio filter • Diode protected audio output • Spot switch • Controlled RX-TX transition (no chirps, no key clicks) • Low noise, low distortion audio chain • “No Tune” RF filtering • Improved DC power filtering – Eliminates DC receiver “howl” • Improved VXO buffering • No relays – solid state antenna switch
Easy Audio Bandpass Filter Kit - QRP Kits
http://www.qrpkits.com/files/AFBPF_Manual_V4_20160707.pdf
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 reception or other devices that may not have sufficiently narrow bandwidth.
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