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VEC-841K, KIT, TUNABLE CW AUDIO FILTER | MFJ …
https://mfjenterprises.com/products/vec-841k
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. Speaker disables when phones are plugged in. Uses 12 VDC at 300 mA.
VEC-820K, KIT, SUPER CW AUDIO FILTER | MFJ …
https://mfjenterprises.com/products/vec-820k
The VEC-820K Electronic Kit gives an incredibly narrow 80 Hz bandwidth and extremely steep skirts with no ringing for razor sharp selectivity. It will pull CW signals out of interference in any ham radio band. You simply plug the kit into your radio phone jack to drive phones or between audio stages for full speaker operation.
Audio CW Filter - PARA
https://www.para.org.ph/docs/CW-Audio-Filter.pdf
buying a ready built audio cw filter, building from a kit, building from a published circuit design, I decided to build the audio cw filter from a kit. Before looking at audio cw filters my preference was to find a audio cw filter kit which had a fixed bandwidth, center frequency and gain.
Audio Filter Kit - MTechnologies
https://www.mtechnologies.com/misc/filter.htm
Super CW Filter Kit with 1W Audio Amp. $29.95. The Vectronics Super CW Filter kit is an inexpensive way to add sharp, narrow filtering to any transceiver or receiver. It works on the audio output from the receiver-- just connect it to the headphone or speaker jack. Connect your headphones or a speaker on the output of the filter and enjoy QRM ...
K4ICY's Home Brew CW Audio Filter
http://www.k4icy.com/cwfilter.htm
Just search for "CW Filter" in Google. Kits are a great way to help you learn electronics. Operation: This is how I use the filter: I plug an audio patch cord (commonly found at Walmart) between the rig's phone jack and the input of the filter. If the rig's output is in stereo, then add an adapter.
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