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Autek Research QF-1A Active Audio Filter User Manual
http://www.radiomanual.info/schemi/ACC_audio/Autek_QF-1A_user.pdf
Your Autek QF-1A audio filter is the product of several years of development by the originator of commercial active audio filters for shortwave communications since (1972). Each filter is thoroughly tested twice before shipment. Please read the instructions carefully for best results, and save them for future reference. If you require
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 MODEL QF-1A SSB CW AM AUDIO FILTER 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 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 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
Autek Research QF-1, Autek Research QF-1A, Autek Research RF-1
https://www.universal-radio.com/used/sold302.html
UI69Autek Research QF-1A $64.95SOLD Audio Filter This Autek Research QF-1audio filter features: Peak, Notch and Low Pass. Input is via a hard wired RCA phono cable off the rear panel. Operates from 120 VAC. [02/14] UR05Autek Research RF-1 $79.95SOLD Pocket Analyzer
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 DSP filter (MFJ-784B) that has many features. I especially like the autonotch and AGC features.
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