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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
AN EASY-TO-BUILD, HIGH-PERFORMANCE PASSIVE CW FILTER Modern commercial receivers for amateur radio applications have featured CW filters with digital signal processing (DSP) circuits. These DSP filters provide exceptional audio selectivity with the added advantages of letting the user change the filter’s center frequency and bandwidth.
Passive LC CW audio filter - QSL.net
https://www.qsl.net/dl4yhf/passive_lc_audio_filter/passive_lc_cw_audio_filter.htm
Description. Not much to say about this filter.. it's a passive L/C filter for aural CW reception, built from junk box partsas an 'ugly weekender build'. It helped a lot on MW in the presence of QRM, or when veryweak signals had to be copied. The bandwidth is deliberately low (only about 20 to 50 Hz) so if not really necessary, the filter can / shouldbe bypassed with a simple switch.
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
The strategy here for realizing a quick, simple, and effective 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 CW pitch range. The splice will
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 …
A Passive LC Audio Filter For Amateur Radio Use
http://www.genebitsystems.com/david/AudioFilter/A_Passive_LC_Audio_Filter.pdf
The passive LC filter is physically larger and heavier compared to other filter implementation methods. This limits its suitability for use in portable applications. In spite of these drawbacks, passive LC filters do have a major advantage. Being entirely passive, they do not introduce the noise and distortion typical of many active circuits.
MODIFYING THE W3NQN PASSIVE CW AUDIO FILTER TO …
http://qrqcwnet.ning.com/profiles/blogs/modifying-the-w3nqn-passive-cw
MODIFYING THE W3NQN PASSIVE CW AUDIO FILTER TO INTERFACE WITH YOUR COMPUTER'S SOUND CARD. MODIFYING THE W3NQN PASSIVE CW AUDIO FILTER TO INTERFACE WITH YOUR COMPUTER'S SOUND CARD ARTICLE IS HERE. ED, W3NQN. has made a special price offer to sell just the w3nqn parts for this project at ( $23 postpaid) to anyone …
K4ICY's Home Brew CW Audio Filter
http://www.k4icy.com/cwfilter.htm
Home Brew CW Filter: If you are just getting into CW and you are starting off with an older radio or QRP set. Newer radios may come equipped with filters for narrowing the audio passband or digital signal processing (DSP) to clean up unwanted noise. But you may be faced with trying to pick out a wanted signal from a swamp of others.
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 …
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
Building the W3NQN Passive Audio Filter
http://www.wb2art.com/docs/filter.doc
The passive audio filter ‘reduces wide-band noise and restricts the audio bandwidth of the receiver’ (from the 1985 Handbook). The Handbook describes a 10-element Chebyshev band-pass filter, using telephone-type toroids, which are supplied. The center frequency of the filter should match the sidetone frequency of your receiver.
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