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Datong FL3 Radio Receiver Audio Auto-Notch Filter Unit ...
http://www.knoppix.net/store/Datong-Fl3-Radio-Receiver-Audio-Auto-notch-Filter-Unit-improves-Reception-_391055921298.html
Datong FL3 Radio Receiver Audio Auto-Notch Filter Unit ***IMPROVES RECEPTION***: $199.95. This item is the Datong FL3 audio filter that can be connected toany amateur or shortwave receiver. Datong filter units are considered to beexceptionally …
Datong FL2 FL3 Audio Filter - Universal Radio
https://www.universal-radio.com/catalog/filters/FL2.html
Audio Filter Discontinued! Datong FL3 Audio Filter Discontinued! Please check our Used List. Recently sold used. Discontinued Audio Filters : The Datong FL2 The FL-2 is designed specifically to improve reception of SSB, CW, RTTY and AM signals in interference conditions. It features twelve poles of tunable active filtering, independent low and high-pass filters, and a built-in …
DATONG FL -3 AUDIO FILTER
https://worldradiohistory.com/hd2/IDX-UK/Amateur-SW/Archive-Short-Wave-Magazine-UK-IDX/IDX/80s/SWM-1987-11-IDX-22.pdf
DATONG FL -3 AUDIO FILTER Ken Michaelson G3RDG Datong's basic multi -mode filter, the FL2, has been around for several years now and before that there was the FL1 which really impressed me when I had one. The latest version is the FL3 which, while being based on the original design,
Multi-Mode Filter FL-3 Amateur-D Datong Electronics,
https://www.radiomuseum.org/r/datong_multi_mode_filter_fl_3.html
The Datong FL-3 contains the same filters as the Model FL-2 plus an automatic notch filter. The auto-notch function is intended for removing unwanted tones or whistles from speech signals. The auto-notch will track, then lock onto the signal. Then the LED will light, and the offending tone will disappear! Requires 10-15 VDC. 7.2" x 6" x 1.7".
Datong FL3 audio filter incorporating MiniWhip on HF - …
https://www.youtube.com/watch?v=c_BWamWWepk
In this video I show you my Datong FL3 filter which must date from the early 90s or maybe earlier. However it still has a role to play and in some regards th...
eHam.net
https://www.eham.net/reviews/detail/1802
Picked up a Datong FL3 at a hamfest for $30. What a bargain. With the supply of classic crystal ladder filters declining and price increasing, this audio filter is quite a bargain. Rather than $120 for a 1st IF and $80 for a second IF filter, I put this in line and presto .... can decrease the bandpass to 100 hz !
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