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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 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 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.
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 QF-1A AUDIO FILTER!! | eBay
https://www.ebay.com/itm/125127910398
AUTEK QF-1A AUDIO FILTER!! Have one to sell? Sell now - Have one to sell? Shop with confidence. eBay Money Back Guarantee. Get the item you ordered or get your money back. Learn more - eBay Money Back Guarantee - opens in a new window or tab. Seller information. ham_stuff (10532) 100% Positive feedback.
AUTEK MODEL QF-1 AUDIO FILTER Service Manual download ...
https://elektrotanya.com/autek_model_qf-1_audio_filter.pdf/download.html
AUTEK MODEL QF-1 FILTER QF1 AUDIO QF; If you have any question about repairing write your question to the Message board. For this no need registration. Please take a look at the below related repair forum topics. May be help you to repair.
eHam.net
https://www.eham.net/reviews/view-product?id=756
The filter I bought off the auction site had been modified for two inputs. Nice touch. I now have an IC-735 on one input and the FT-840 on the other. I usually listen to some 40 meter nets early in the morning. With this filter the audio receive quality has …
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