John Smith wrote:
... as a matter of fact, they are scanned from "copyright expired"
material...

If so, then I apologise. But...

He is correct about it being a voltage balun, which I believe is what you
first asked about, at least that is what the balun you referenced looked
like to me--I make mistakes and could have been mistaken... however, there
is also a post from me in this thead on the current balun you can use...
when you read my post on the quick-start on the differences for
voltage/current baluns you can decide for yourself--on what you need...
baluns are a very simple thing, don't know why so much mystery wants to end
up wrapped about 'em...

Might it possibly be because people persist in copying and
re-re-re-publishing old, incorrect information?


--
73 from Ian GM3SEK 'In Practice' columnist for RadCom (RSGB)
http://www.ifwtech.co.uk/g3sek