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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 …

CW audio filter circuits | QRZ Forums

    https://forums.qrz.com/index.php?threads/cw-audio-filter-circuits.420146/
    CW audio filter circuits. Discussion in 'Homebrew and Kit Projects' started by N0FN, Jan 10, 2014. Thread Status: Not open for further replies. Page 1 of 2 1 2 Next > N0FN Ham Member QRZ Page. My search for a QRP rig is complete! I ended up with a 40 year old TenTec Argonaut 505 instead of a kit radio that I need to build. It was an interesting ...

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.

Audio filters for CW

    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: …

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
    than do phone signals. What is needed is a filter that narrows the receiver's frequency response. around a tuned-in desired CW signal, so that the signal's power is emphasized over the power coming. in from noise and interference around the signal's frequency. This is …

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