We have collected the most relevant information on Autek Qf-1a Active Audio Filter. Open the URLs, which are collected below, and you will find all the info you are interested in.
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 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.
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.
FS: Autek Research QF-1A Active Audio Filter | WorldwideDX ...
https://www.worldwidedx.com/threads/fs-autek-research-qf-1a-active-audio-filter.218755/
750. - $85 + s/h. - Case painted flat black. - LED power light installed. - replaced 1/4" phone jack/plug with 3.5mm phone jack/plug. - Power switch replaced. - video's of operation can be viewed on YouTube. - Original instructions included. - Payment via PayPal.
Now you know Autek Qf-1a Active Audio Filter
Now that you know Autek Qf-1a Active Audio Filter, we suggest that you familiarize yourself with information on similar questions.
