"Fractenna" wrote in message
...
I have listed 5 lots of NEW heavy duty antenna wire on ebay.

Please cleck on this link to see the listings and pictu
http://search.ebay.com/heavy-duty-an...sortpropertyZ1

I ship worldwide.

Thanks,

Bill

Bill,

The claims you make about this wire don't sound right.

Stranded wire does emulate a conductor with the same, or slightly larger,
diameter. However, the increased, self-shielding surface area is very
prone to
oxidation via mositure. Ergo the conductivity decreases somewhat over
time. You
compare to #14 wire, which is fairly thin in this application. Perhaps you
should compare to a solid conductor of the same diameter, such as #10?

Stranded wire is used on LF and VLF transmitters because it is
economically
impractical to make wire with very wide diameters. However, it is not the
STRANDING of the wire that's important, per se, but the overall diameter.

It's a good product, but the reasons you state for buying it don't make
sense
to me. Perhaps you have some data that shows superior gain and bandwidth
of
stranded copper compared to regular copper of the same diameter? I am not
familiar with any measurable differences in the apps you target. Kindly
fill us
in if I am wrong.

I fear your potential buyers might assume substantial increases in gain
and
bandwidth from your comments on the description, when, in fact, little
benefit
, if any, is attained.

73,
Chip N1IR

==================================

Sranded wire is also used because it is flexible and easier to erect.

But stranded wire of the same diameter has a somewhat higher HF resistance.
As usual it is skin effect.

Current tends to flow only on the extreme outermost surfaces of the strands.
So the surface area is less than the surface area of a solid wire of the
same overall diameter. The fewer the number of strands the greater the
effect. Imagine where the current flows with only two strands. There is
also the very minor effect of spiralling.

But continue to use stranded wire for its undoubted superior mechanical
properties. If its HF resistance is too high then increase its diameter -
just as is done with the solid stuff. The loss or gain in S-units per lb
weight per mile is not worth the bother of consideration.
----
Reg, G4FGQ