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Audio CW Filter - PARA
https://www.para.org.ph/docs/CW-Audio-Filter.pdf
buying a ready built audio cw filter, building from a kit, building from a published circuit design, I decided to build the audio cw filter from a kit. Before looking at audio cw filters my preference was to find a audio cw filter kit which had a fixed bandwidth, center frequency and gain.
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
AN EASY-TO-BUILD, HIGH-PERFORMANCE PASSIVE CW FILTER
http://www.discolodxgroup.cl/documentos/otros/ARRL%202013%20Handbook/ARRL%202013%20Handbook%20Supplemental%20Files/Chapter%2011/Passive%20CW%20Filter%20project.pdf
CW filter over DSP filters.1 The CW filter assembled and used by KØSR is the passive five-resonator CW filter that has been widely published in many Handbooks and magazines since 1980 (see references 2-11 at the end of this text). If you want to build the high-performance passive five-resonator CW filter and experi-
Audio filters for CW
https://k4lxycw.wixsite.com/blog/post/audio-filters-for-cw
It is compact, an easy build and the price is right. More recently I discovered the CALF audio filter and limiter by KC9ON. This can be purchased as a kit or assembled ($55-$80 plus postage) and comes with a nice case. It too has a center frequency of 700 Hz, though a chart is supplied to allow that to be altered by changing some resistance and ...
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 …
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
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 The splice will unavoidably introduce extra impedance into the speaker circuit; but at …
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