On 2 Nov, 21:19, Roy Lewallen wrote:
Stefan Wolfe wrote:

Actually braid has muxh less 'resistance' than a flat or round conducor at
RF due to greatly increased surface area and skin effect.

Sorry, that's simply not true, except at lower frequencies where the
skin depth is comparable to the wire diameter. It's at those frequencies
that Litz wire can provide some advantage. But it's made of separately
insulated strands. Because of skin effect, the current at HF (or
wherever the wire diameter is at least several skin depths) is only on
the outside surface of the braid, not the outside surfaces of all the
wires. The extra loss comes from the necessity of the current moving
from one set of wires to another as the original set goes under an
adjacent group.

I have heard this statement before but consider it just gossip
I see no reason for the so called "necessity of current moving
from one set of wires to another as the original set goes
under an adjacent group". Neither have I come across any proof
of such a thing happening. The impedance on the current carrying
wire is certainly less than that encountered by jumping a "gap"
so there is no "necessity" to creat corona of any sort, especially
when the current has to take a 90 degree turn to get the job done.
I could change my mind if actual proof was presented,
that is if any exists; otherwise I just view such statements
as a propagation of falsehoods while mismanaging a response.
A case in point, a silver contact on a relay after spending
some time in a cardboard package requires in excess of 24 volts
to break down the oxide so imagine what it would take to break
the oxide doiwn of copper!






snip.

Roy Lewallen, W7EL

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