Hi Reg

The two pieces of coax are only meant to be a 100 ohm balanced Q section
to translate the antenna Z to close to that of the main feedline (50r).
I could do the same if I had some 100r open/ribbon feedline.

The outer conductors/shield should be at zero potential and as such
preserve the Z between the two inner conductors. This is handy in that
the coaxes dont have to be bound close together and could be fed through
a non metallic conduit without problems.

Have I made any sense?

Cheers Bob

Reg Edwards wrote:

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Bob, what is the purpose of the coaxial outer conductors which are not
connected to anything.except to each other?
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Reg.