Hello Scott,
the discussion is about a
10 by 10 meter loop and 100W RF power.
Using 4 x 1.5mm Cu wire
(parallel) the DC resistance of a 10 by 10 meter loop is
about 0.1 Ohm. Ignoring other losses and tuning the loop the
current is about 32A.
I don't have an
idea what addional (ground) losses tha loop will suffer from
at 9kHz.
The
loop indictance was calculated 40uH (by Jim), so the loop
has a reactance of 2.3 Ohm at 9kHz. This means that the loop
voltage is only about 70V, so stray currents to the ground
(or other grounded objects near the loop) will be minimal
and these losses can be ignored.
Other losses
are due to induced currents (so called Eddy currents), but
if I remind well these losses are proportional to the square
of the frequency what means that at 9kHz these lossses are
over 200 times less than on 137kHz.
In an
ealier mail I suggested to use coax cable as loop wire.
But to
my own surprise Belden (main coax cable manufacturer) gives
rather large DC resistanses:
But
even RG8 would be no better that 4 x 1.5mm Cu wire in
parallel.
73,
Rik ON7YD
