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Datong Frequenz - Agile Audiofilter Fl - Radio Amateur 10-1979
https://www.radioexperimenter.us/rm-1979-10/t-ouc.html
The current state of the art in audio filters can best be seen in the Datong FL1 "Frequency-Agile" filter. It is manufactured in England and is truly the …
Datong FL2 FL3 Audio Filter - Universal Radio
https://www.universal-radio.com/catalog/filters/FL2.html
The Datong FL3contains 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 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
$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 well designed, easy to use and effective. These units were manufactured several years ago and rarely come up for sale.
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...
Frequency-Agile Audio Filter FL1 Amateur-D Datong Electronics,
https://www.radiomuseum.org/r/datong_audio_filter_fl1.html
Model: Frequency-Agile Audio Filter FL1 - Datong Electronics, Ltd.; Shape Tablemodel, with any shape - general. Dimensions (WHD) 205 x 83 x 140 mm / 8.1 x 3.3 x 5.5 inch Notes Datong Frequency-Agil Audio Filter FL1.
Datong Archive - FL1 - Google Search
https://sites.google.com/site/datongarchive/fl1
Datong Archive - FL1 FL1 Frequency-Agile Audio Filter Datong's first audio filter. I bought mine for the grand sum of £30 new when they were selling them off in 1986 and I still have it. Although...
Datong Audio Filter vs DSP/Digital Filter from BG5ROJ ...
https://www.youtube.com/watch?v=XI2AcJCfOBo
Testing the usability of the "Datong Multimode Filter FL2" and the "DSP Audio Filter" by BG5ROJ. Both filter are in the AF-chain, and i use HRD to visual...
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