Nice Condition Fully Functional Datong Model ANF automatic notch or CW filter that removes tune-up whistles/heterodynes automatically and connects in series with speakers on any receiver. 10 LED bar-graph type display with built-in fully tunable 4 pole CW filter. Runs on 11 to 18 VDC at 75 ma. Tunes 270 to 3500 Hz. Notch is better than 40 DB at 3.5 KHZ. It was also marketed as an upgrade to the Datong FL-2 to give it the auto notch feature found on their Datong FL-3. A wal-wart is included, no manual, though I have a URL for the manual, specs, and service/schematics sheets available to download. Noted by g4wje elsewhere: An auto notch is vital for SSB ops. Amateurs from certain European countries (you know the one\'s!) seem unable to resist tuning up right over the top of the station they\'re wanting to work. This filter kills off the heterodyne automatically. What\'s more, it will track a tone as it moves, so it\'s good at getting the whistlers too.Please consider our pictures a part of the description and carefully judge cosmetic conditions by zooming in on the many photographs before purchasing. From a smoke-free home. We ship quickly. Contiguous 48 states only, sorry, but Hawaii, Alaska and Puerto Rico are excluded unless contacted first for shipping arrangements, no international. PayPal payment due within 24 hours and your shipment is made within one business day.

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