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Audio CW Filter - PARA
https://www.para.org.ph/docs/CW-Audio-Filter.pdf
The difference between Passive and Active audio filters can be found on page 6 While doing the research for audio cw filters on the internet, I found a lot of information including audio cw filter reviews, video demonstrations of different audio cw filters in use, technical articles on audio filtering, published audio cw filter
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
filters - a suitable one could be used as a CW filter, provided it was properly impedance-interfaced with the audio source. Passive filtersare just filters which do not employ active components (like transistors) which require a source of power (like a battery); …
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-
Passive LC CW audio filter - QSL.net
https://www.qsl.net/dl4yhf/passive_lc_audio_filter/passive_lc_cw_audio_filter.htm
Schematics and prototype of the passive CW audio filter. The 16-position rotary 'hex' switch is hidden under the 'potentiometer' knob at the upper right corner. Click on the image for full resolution. The second resonant element (LC tank with L1 + C1, tapped at a low impedance point) is connected parallel to the headphone output.
A Passive LC Audio Filter For Amateur Radio Use
http://www.genebitsystems.com/david/AudioFilter/A_Passive_LC_Audio_Filter.pdf
Passive LC filters can be quite effective in improving the audio from a receiver. Residual power supply hum can be virtually eliminated and background hiss originating from wideband high-gain amplifier stages is often greatly reduced.
CW Audio Filter - Rob's Blog
https://robs-blog.net/2015/12/15/cw-audio-filter/
As you can see in the above image, the filter is designed with a 600hz centre frequency, this is where I prefer to listen to CW and find it a pleasant listening experience. The filter width is ultra narrow. being only 200hz wide, so 100hz either side of the centrer frequency i should hear a fair bit of attenuation.
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