"Roy Lewallen" ha scritto nel messaggio
...
I'm told that composite carbon materials have quite different conductivities
in different directions, like a laminated transformer core. At least this
should minimize eddy currents.

Roy Lewallen, W7EL

It looks like the rod I have used was built by winding a narrow tape on a
tapered cylindrical support (in spiral fashion).

73

Tony I0JX