Mike Coslo wrote:
On 10/18/10 12:04 PM, Jim Lux wrote:
Cecil Moore wrote:
On Oct 17, 6:42 am, Alejandro Lieber alejan...@Use-Author-Supplied-
Address.invalid wrote:
It appears to me that in the short circuited turns, a very big current
must be circulating, adding heat losses and lowering the Q of the
circuit.

For a screwdriver antenna, the problem is solved by a conductive
sleeve over the outside of the shorted turns that keeps most of the RF
on the conductive sleeve instead of in the shorted turns of the coil.
--
73, Cecil, w5dxp.com

But, isn't that conductive sleeve itself a shorted turn? It's
conductive, coaxial with the rest of the inductor above the sleeve, so
the magnetic field certainly passes through it.

Whic of course means that everything everywhere is a shorted turn. 8^)

Indeed, but some shorted turns intercept more flux than others.
Hopefully the field in the passenger seat is small enough that the power
dissipated in one's spouse's ring is fairly low.