Ian White GM3SEK wrote:
Sorry, maybe there's language barrier here. Imagine coiling a rope in
your hand like a cowboy, then laying the coil on the ground. I meant a
"flat" coil in that sense, as opposed to the other way of winding these
chokes on a cylindrical former.

A lot of arguments are over semantics. Again, there are
three ways of winding the chokes; helical, flat spiral,
and bunched like a cowboy rope. The flat spiral is also
known as a "pancake" choke or coil.
--
73, Cecil http://www.w5dxp.com