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Audio CW Filter - Philippine Amateur Radio …
https://www.para.org.ph/docs/CW-Audio-Filter.pdf
A audio cw filter is a way to add narrow audio filtering to the audio output of a transceiver or receiver, the audio filter is usually placed between the audio output from the transceiver phone socket and the operators headphones or speaker, using an audio
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 ...
A very simple and very effective passive CW audio filter
http://ki3u.byethost3.com/Radio-PhysicsDIR/ecomDIR/Simple_passive_CW-filter/Simple%20passive%20CW%20audio%20filter.html
The strategy here for realizing a quick, simple, and effective make-do passive CW audio filter is to splice into the line between the radio receiver's audio output and its speaker a minimal series LC combination having a resonant frequency in the CW pitch range .
Tunable SSB/CW Audio Filter
http://www.radiomanual.info/schemi/ACC_audio/MFJ-751B_user.pdf
MFJ-751B Owner's Manual Tunable CW Audio Filter 1 INTRODUCTION Thank you for purchasing the MFJ-751B Tunable CW Audio Filter. The MFJ-751B consists of a four stage, switch selectable band pass CW filter, using selected components that will make “cleaning up” CW signals effortless and easy. Featuring razor sharp selectivity with extremely steep
Audio filters for CW - k4lxycw.wixsite.com
https://k4lxycw.wixsite.com/blog/post/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 filter options. But the other reason is my aging hearing: …
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