[Elecraft] Parts for compact loop antenna - toroid help

[Daniel Reynolds]

I'm just posting this so that someone can tell me ... NO - DON'T DO THAT - or -
DO THIS.

I know I could use a loop inside of a compact loop, but a toroid is more
appealing for me because of the size and appearance. It looks like the
consensus is that I need an Iron Core Toroid ... something along the lines of a
T-50-6 (or larger size diameter T-114-6). This will be used as a 'transformer'
between a turn (or a few turns) of wire run between the center conductor and
shield of my coax, and a single turn of a compact loop. I plan to use this for
80-20m.

When I inquired with the original author of the webpage (aa5tb) - he thought he
used a ferrite core ... FT-114-43 maybe - he didn't know for certain. It sounds
like from some of you - that a ferrite core has significantly less coupling
than an iron core.

Can I safely assume that if a core is of a low density (reduced coupling), that
I can make up for it with more turns on the primary/coax side - however, if it
is a high density core - it would be very hard to reduce coupling since the
secondary/compact loop side is already limited to one turn?

Finally - many of you were able to tell me about the cores - BUT - what core
would you use for this application (coupling your transmission line to a
compact transmitting loop)?

Thanks again - and sorry about the Off Topic post (albeit - it is for a
QRP/Elecraft radio).

- Daniel / AA0NI