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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
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.
Hi-Per-Mite active audio CW filter build and information
https://sites.google.com/site/hipermite/
Hi-Per-Mite active audio CW filter build and information. In February 2014 I purchased and built the Hi-Per-Mite active audio CW filter kit which was …
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 …
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 …
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