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Audio CW Filter - PARA
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 cw filter also helps to reduce qrm/qrn (fig 1) An external audio cw filter is also transferable between transceivers, which is …
K4ICY's Home Brew CW Audio Filter
http://www.k4icy.com/cwfilter.htm
If the received CW audio is clear or even piercing then the filter isworking. Since this filter is extremely narrow, some "ringing" (whichsounds like noise played underwater) may be produced. The provided schematic has component values set to provide a frequencyresponse filter the incoming audio at around 750 Hz.
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 signals in the typical 3K …
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 receiving both sidebands …
THE HI-PER-MITE ACTIVE AUDIO CW BANDPASS FILTER IS …
https://qrqcwnet.ning.com/profiles/blogs/the-hi-per-mite-active-audio-cw-bandpass-filter-is-awesome
FLdigi is sending three different cw characters at three different cw pitches; 400 hertz, 700 hertz, and 1000 hertz at equal volume. The HI-PER-MITE filter is used in the second half of the file as a narrow active bandpass filter centered at 700 hertz and does a great job of reducing (@-30db) the other two cw signals of 400 hertz and 1000 hertz. This test was setup to closely represent a …
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