"art" wrote in message
ups.com...
On 25 Oct, 09:38, Cecil Moore wrote:
art wrote:
At first I was considering the actual wire length
in the braiding b ut that influence became little
compared to the current pertabutations.

Sounds like you are working on a self-resonant coil
and need to know the length of time for the current
to flow from end to end.

Both sides of the argument are wrong on that one.
The current does not jump from one end of a coil to
the other in a very small number of nanoseconds as
one "expert" has asserted which implies a VF close
to 1.0. Neither does the current follow the wires
directly round and round the coil as asserted by the
other side which would imply a VF around 0.01.

The actual measurable VF of a coil seems to be just
about double the round-and-round argument side as
there is indeed some coupling between adjacent coils.
A typical 75m Texas Bugcatcher 6" dia, 6.5" long,
4 tpi coil has a VF of around 0.02 making it about
40 degrees long at 3.8 MHz.
--
73, Cecil http://www.w5dxp.com

No Cecil you are following a fatal aproach by using
lumped loaded circuitry which is a no no when measuring current speed.
Especially when you are following a path of zero standing waves.
To obtain a voltage doubling you can only solve by using
distributed loading aproach where a single wire has approx length
when measured close to the ground short of two wavelengths .
Unfortunately by using braid to get extra current perbutatation
the length extends quite a bit longer even tho braiding electrical
length is longer that the physical measurement.
Ofcourse the introduction of a flyback transformer would be
exciting but we must not run before we walk
Regards
Art

Art
I think you cannot rely on calculating the braided length as being longer
than the physical length. While it is true that the braided wire if
unravelled would likely be considerably longer, RF waves propagate along the
surface of the wire. They will jump from one wire to the next where the
braids cross, following the path of least resistance. You would probably
need to use braided Litz wire, where each strand is individually enamelled
to achieve what you appear to be trying to do.
Regards
Mike G0ULI