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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 …
K4ICY's Home Brew CW Audio Filter
http://www.k4icy.com/cwfilter.htm
What you need to do is just pick out one single CW signal. This little accessory will add the much needed narrow band filtering to your audio radio's output. The circuit used is an active RC driven filter using Op amps and is pre-constructed for a set frequency range. The circuit was inspired from the ARRL Extra Class study manual's
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
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 typical nearby interfering signal(s) that you might hear when on the air with other cw signals that are nearby your own frequency.
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 …
Easy Audio Bandpass Filter Kit - QRP Kits
http://www.qrpkits.com/files/AFBPF_Manual_V4_20160707.pdf
Easy Audio Bandpass Filter Kit Description and Specifications The Audio Frequency Band Pass Filter kit from qrpkits.com provides A basic audio filter kit with 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
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