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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.
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.
Morse Code Audio Decoder | Morse Code World
https://morsecode.world/international/decoder/audio-decoder-expert.html
Samples. The following table lists some pre-recorded samples along with audio filter parameters that work well. The first three samples have been downloaded from the translator and are therefore very clean sounds. "Fox" was recorded through a microphone by a someone actually sending Morse code.
CW passive Audio Filter with Morse Code Key for Ham ...
https://www.ebay.com/itm/255318808771
The unit connects between the audio output of your transceiver. It reduces the noise level whilst allowing the CW through. This is best used with low impedance standard headphones. All jack connections on the board are 3.5mm.
Audio-frequency bandpass filter – Venus Information ...
https://www.venus-itech.com/product/audio-frequency-bandpass-filter/
Audio-frequency bandpass filter for Morse code receiving. Bandwidth: 500Khz. Passive. Available on backorder. Audio-frequency bandpass filter quantity. Add to cart. Category: Radio Accessories. Reviews (0) Reviews There are no reviews yet. Be the first to review “Audio-frequency bandpass filter” Cancel reply.
Samuel Morse - Electro-Resales LLC
https://www.electroresales.com/samuel-morse.html
This practice module is specifically for paddle keys providing the user with a convinient module for gaining proficiency in sending Morse code using a paddle key. dits and dahs are automatically generated and alternating dits/dahs are possible by squeezing the paddles together. Speed adjustable, high output of clean tone to speakers. This CW filter is a great add on filter for …
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