On Wed, 15 Mar 2006 22:42:55 GMT, Cecil Moore wrote:
The VF of my 75m bugcatcher coil calculates out to be
VF = 0.0175 at 6.6 MHz

On Fri, 10 Mar 2006 13:35:14 GMT, Cecil Moore wrote:

I'm willing to bet that my 75m
bugcatcher coil has at least a 40 nanosecond delay on 4 MHz
which is a 60 degree current phase shift.

On Wed, 15 Mar 2006 18:03:28 GMT, Cecil Moore wrote:

The coil data is: ~6" dia, ~6.7" long, 26.5 T, seems
very close to 4 TPI. Looks to be #14 solid wire.

Total turns 26.5
Through total turns, total wire appears to be 505"

With nothing offered in the way of inductance, from calculations it
appears to be 72.9 µH

With nothing offered in the way of distributed capacitance, from
calculations it appears to be 8pF

On Tue, 14 Mar 2006 04:09:08 +0000 (UTC), "Reg Edwards"
wrote:
V = 1 / Sqrt( L * C ) metres per second,
where L and C are henrys and farads per metre respectively. The
formula for L and C can be found in your Bibles from coil dimensions,
numbers of turns, etc.

V = 1 / Sqrt (5.88 * 72.9* 10^-6 * 8 * 10^-12) meters per second

where the 5.88 is to correct for per meter computations

it follows that V must then be 17.1 million meters per second


The velocity factor = V / c
Vf = 0.057
and Zo = Sqr( L / C ).
Zo = Sqrt (72.9* 10^-6 / 8 * 10^-12)

3 KOhms

It appears your reference source leads you to an answer that is off by
325%

OR

Reggies' hints of a solution are in error

OR

I've pencil whipped this to death due to the tedious collection of
data spread through 300 postings and the chain of computation. I will
leave that to other, less lazy individuals to ponder.

OR

This is simply proof of an exercise in futility through the
misapplication of the theory of transmission lines to lumped
components.

It is quite apparent something's broke, but if the correspondence
descends into theory, it will be that theory is broke. There's enough
quantifiables to come to terms with before any theory is proven.