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The Magica Audio Fil - N5DUX homepage
http://www.n5dux.com/ham/files/pdf/The%20Magical%20Audio%20Filter.pdf
the notch filter. With 800-Hz signal coming in, ad- just the notch control to a point where the signal drops in volume. On some CW sig- nals with key clicks and thumps, the 800-Hz signal will drop out but the clicks and thumps will still be there. I have found that it is easier to remove a hetero- dyne with the peaking cir-
K4ICY's Home Brew CW Audio Filter
http://www.k4icy.com/cwfilter.htm
response filter the incoming audio at around 750 Hz. The "shoulder" of the response curve is wide enough to allow (700-800 Hz) If you have a different "Side tone" on your rig than 750 Hz, you will first need to zero-beat the signal in bypass mode first, use the RIT on your receiver to "fake" the received tone match 750 hz.
The Idiom Press SCAF-1 Audio Filter
https://www.hamsupply.com/wp-content/uploads/2016/07/SCAF_Review.pdf
used in several amateur homebrew and commercial circuits in the mid-1980s. Switched capacitor filters may be con-figured as high-pass, low-pass, band-pass, or notch devices. The SCAF-1 is the low-pass filter variety. How do SCFs work? Even a concise explanation would take half-a-dozen pages of text, equations, and diagrams . . . more
KC4GZX DIY Homebrew Projects #4 - QSL.net
https://www.qsl.net/kc4gzx/kc4gzx/project40.htm
Filter Circuit for the Earthworm Seismic Data Acquisition System; Active 2nd Order Filters; RC Notch Filter (Twin T) Multiple Feedback Bandpass Filter; CW filters; Self-tune filter; SSB AF filter; Helical Resonator Notch Filter; 3KHz low-pass filter plus audio amp (PDF) Active bandpass filters; Bandpass filters; Butterworth filters; Narrow band ...
Antique Radio Forums • View topic - Re: Notch filter.
https://antiqueradios.com/forums/viewtopic.php?t=120762&start=0
The notch filter passes all frequencies except one (actually a very narrow range of frequencies). The frequency response plot looks like a flat line with a narrow notch at the filter frequency. So, you are hearing this squeal. You adjust the notch filter slowly until POOF, the squeal disappears!. It can actually be used to filter any narrow tone that you don't want to hear. For hams this …
Passive Filter Circuits : 4 Steps - Instructables
https://www.instructables.com/Passive-Filter-Circuits/
Notch filters are used to filter out a very specific range of frequencies, for example to filter out interference of a particular frequency if you happen to live next to a radio station. Bandpass filters do the opposite and will filter out everything but frequencies in a narrow range, and are thus used in radios to tune in to a specific frequency.
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 …
Tips for building a vhf pager notch filter ...
https://forums.radioreference.com/threads/tips-for-building-a-vhf-pager-notch-filter.55272/
anywhere near 152 tru 160 MHz. The notch filter helps, the depth is about 25 dB and it is fairly narrow, about 1 MHz at 10 dB. Filter does not effect other ranges, good from 30 to 1000 MHz. I used a sprctrum analyzer and signal generator to tune and measure. Been using this notch filter for over 3 years now. If I could figure out how to post a picture,
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