Here is a used Datong Electronics Multi-mode Audio Filter with Automatic Notch Filter - Model FL3. Featuring four state-of-the-art audio filters in one box - the ultimate accessory for any communications receiver. Fully variable knife-edge selectivity and great for automatically getting rid of tune-up whistles and heterodynes

For full features and instructions please check out the following two web links;
http://datongarchive.googlepages.com/fl3_specs.pdf
http://datongarchive.googlepages.com/fl3_sheet.pdf

A copy of these instructions and other literature will be sent to the auction winner.

The auction is for the FL3 model unit only, no cables or power supply included. Power supply should be 10 to 15 v DC.

Please check my other listings now and over the next couple of days as many other radio related items will be put up for auction.

Winner should pay within 3 days of auction ending, either by cash, Paypal or cheque

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On 16-May-08 at 21:05:18 BST, seller added the following information:

It must be pointed out that if the winner prefers to pay by cash then it must not be sent through the post. Cash will only be accepted on collection of item ( COC ) and on in-person transactions.