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filter - QSL.net
https://www.qsl.net/n/n7eku/other/W2EEY_tuneable-peak-notch-audio-filter.pdf
A tunable audio frequency peaking and notching (rejection) filter is one of the most useful accessories you can have. Besides providing effective audio selec- tivity for ssb or cw reception, the audio filter is a useful adjunct in conducting 22 0 march 1970
VEC-841K VECTRONICS VEC841K TUNABLE AUDIO FILTER KIT
https://store2.rlham.com/shop/catalog/product_info.php?cPath=8030&products_id=33250
Notch is a deep 50 dB. Tunable peak filter improves CW, SSB, AM, SSTV, and RTTY signals. This tunable SSB/CW Audio filter gives you constant output when bandwidth is varied, linear frequency control and tighter, smoother notch. Works with any receiver or transceiver. Plugs into phone jack. 1 watt amplifier for external speaker. Speaker and phone jacks.
Tunable notch Filters for audio frequency - Q&A - Audio ...
https://ez.analog.com/audio/f/q-a/533898/tunable-notch-filters-for-audio-frequency
Requirement description: Tunable notch filter from 1KHz to 5KHz. Problem/Issue: Whistling noise in the audio frequency band 1KHz to 5KHz. Solution required: To identify and eliminate the noise in the frequency band of 1KHz to 5KHz. To have a practical solution to identify the noise frequency, we planned to have LTC1060 or LTC1067 in which the notch frequency can be …
Notch Filter Circuits with Design Details - Homemade ...
https://www.homemade-circuits.com/designing-notch-filter-circuits/
Active notch filters were actively used during the earlier decades for amplifier and audio applications for eliminating of 50- and 60-Hz hum …
Tunable SSB/CW Audio Filter
http://www.radiomanual.info/schemi/ACC_audio/MFJ-751B_user.pdf
form a tunable audio filter designed to clarify and remove interfering signals from both voice and digital signals. The Peak and Notch functions are variable, giving the user full control of the filter bandwidth and frequency settings. This not only allows you to remove interference, but also to enhance desired signals.
MODEL NC109 NOTCH FILTER INSTRUCTION MANUAL
http://s230753592.onlinehome.us/ftp/misc/Norcomm%20Notch%20Filter.pdf
The Model NC109 is a high stability field tunable audio Notch Filter designed to attenuate the level of a single tone frequency and pass all other in-band frequencies. These filters may be cascaded for further attenuation of a single frequency or more than one.
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