Am 05.12.2011 02:14, schrieb Warren Ziegler:
Stefan,
I just re-read your post, I gather you are asking about Litz wire
as a loop conductor?
My friend Bill Ashlock tried using ex-Decca Litz wire as a loop and
found that it was too fragile, individual strands broke and the wire
became more lossy than conventional wire.
Ah, R, i should have read this mail before ;-) Interesting. And what
about a combination of Rg214+RF litz wire? Or a small steel wire + the
RF litz?
Well, if the weight is not a problem then RG214 is very fine i think.
But it would be better without the inner conductor and isolation.
It would be interesting to try a longer copper plate, say 0.1m x 0.5mm
as the cross section area. Small holes could be drilled and then fixed
to a steel wire, say 2mm diameter. That must be even better! Take a look
at this link: http://www.gacopper.com/012-CopperStrap.html I would try
the 2'' strap, a thickness of 0.012'' is ideal.
At least for the lower part (close to ground) this must be the best
choice. There you could use even broader plates.
BTW what is the height above ground of the lower part of the loop?
I am considering using large diameter aluminum wire, the conductivity
is of course not quite as good as copper but the skin depth is greater
so that the net result is that Al is 33% more lossy than copper at LF
frequencies but Al is only about 25% of the weight as Cu (also Al is
about 25% of the cost of copper) so for the same weight of wire Al
should be superior.
Don't you expect mechanical problems when using Al?
73, Stefan/DK7FC
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