TopBand: Double coax.

[w8ji.tom]

> By the way, the double coax is much better then open wire or ladder line
if
> you have to run it close to a 
> tower or the ground.

With two unbalanced lines in "push-pull" operated as a balanced line, loss
is exactly identical to the loss of a single cable of the same type and
length. If you have two RG-8 lines operated as a balanced line, loss would
be exactly the same as with one "unbalanced" line the same length using
RG-8.

This means loss is much higher than with true open wire line. It is a
solution for moderate length runs if SWR is not high, but not the best idea
for very long runs or if the line is operated with high SWR.

73 Tom

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