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Autek QF-1A User Manual - gmcotton.com
http://gmcotton.com/Ham_Radio/MISC%20Manuals/Autek/QF1A%20instructions.pdf
QF-1A AUDIO FILTER Your new audio filter is the product of several years of development by the originator of commercial active audio filters for shortwave communications (1972). Each filter is thoroughly tested twice before shipment. Please read the instructions carefully for best results, and save them for future reference. If
IC Audio Active-Filter QF-1 Amateur-D Autek Research;
https://www.radiomuseum.org/r/autek_ic_audio_active_filter_qf.html
Model: IC Audio Active-Filter QF-1 - Autek Research; Wesley Chapel, Material. Metal case. Shape. Tablemodel without push buttons, Mantel/Midget/Compact up to 14. Dimensions (WHD) 114 x 90 x 140 mm / 4.5 x 3.5 x 5.5 inch. Notes. The QF-1 audio filter is a 4 pole filter with Peak, Notch and LowPass functions; the frequency and selectivity are ...
Autek Research SSB / CW / AM audio filter, QF-1A ...
https://www.youtube.com/watch?v=2GyAG0WCzQQ
Project complete. I demonstrate its operation.Donations accepted: paypal.me/PayKlondikeMike
Autek research qf-1A ssb cw am audio filter peak notch
https://www.chicago-industrial.com/North-Chicago/New/Industrial/Woodworking/Autek-research-qf-1A-ssb-cw-am-audio-filter-peak-notch.html5
Autek research qf-1A ssb cw am audio filter peak notch. This unit is placed between your receiver and your speaker. Audio is processed to improve selectivity, remove annoying hetrodynes with an adjustable notch filter, and act as an adjustable low pass or high pass filter for all signals. Selectivity is adjustable down to a narrow 20 hz.
Autek QF 1A | QRZ Forums
https://forums.qrz.com/index.php?threads/autek-qf-1a.378076/
The QF1A manual is here. The output amplifier is a LM380, which can drive a small speaker. The filters are built around LM348 quad op amps. MFJ has similar active filter units available (MFJ-722B, MFJ-751B, MFJ-752D). They also have a …
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