On Sat, 12 Aug 2006 14:30:34 GMT, Cecil Moore wrote:

Reg Edwards wrote:
I agree, a coil at sufficiently high frequencies begins to behave
something like a transmission line with a very low velocity factor.

Just below its self-resonant frequency, it behaves somewhat
like a transmission line of less than 90 degrees.
snip
But maybe one hoot. :-) My 75m bugcatcher coil is operated
relatively close to its measured self-resonant frequency of
6.6 MHz. If I wound a bugcatcher coil to be self-resonant
on 4 MHz and then used 2/3 of that coil for a loading coil
on 4 MHz, its VF would not change and its electrical length
would be 60 degrees accompanied by the appropriate 60 degree
delay through the coil.

Hi Cecil & Reg

Sometime during the '70s I measured the self-resonant frequency of the 80m
Hustler loading coil, 6MHz. The series resistance of that coil was 31 ohms at 4
MHz. That is why they claimed 'lower swr than with othe brands'. What a fraud.
On the other hand, I also measured the Webster KW-80, self-resonant at 14.0 MHz,
with a series resistance of 8 ohms at 4 MHz. I reported this on Page 6-12 in
Reflections.

So I ask you, Cecil, why would you want a bugcatcher self-resonant at 4 MHz for
operation at 4.0 MHz, even if you used only 2/3 of it as a loading coil. Looking
just to heat the coil instead of radiating the energy into space?

Walt, W2DU