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Internet pickings seem mighty slim, would appreciate links to books, articles or websites.

If there are good "how to" items that explain the design, that too. Thanks and 73s

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The best reference is from Jim Brown, K9YC.

http://audiosystemsgroup.com/RFI-Ham.pdf is a well-respected and accurate reference.

Check out the documents available at http://k9yc.com/publish.htm and https://audiosystemsgroup.com.

Low Band DXing by John Devoldere, ON4UN has a chapter that contains information about binocular core transformers. Available from the ARRL.

https://www.w8ji.com/core_selection.htm

Here's a page I wrote about broadband binocular core transformers years ago.

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