Explanation of the principle of a transformer and a coax baluns.
First page which made baluns clear to me (big thanks), there is also something about frequency tolerance and impedance-matching: [ Ссылка ]
Nice video which made balanced/unbalaced line clear to me: [ Ссылка ]
Wikimedia pictures used:
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![](https://i.ytimg.com/vi/GxZbphJpnbw/mqdefault.jpg)