Hi Fraser,
I have some of Westlake's "400W 75 Ohm twin" where both conductors are
totally embedded within the dielectric material. Assuming the field
between the conductors is mostly constrained to the dielectric, I
wouldn't expect much effect from rain. I've never had any of his Heavy
Duty stuff so I don't know whether the same would apply.
But you raise an interesting point, and I'm wondering whether the same
problem might occur with my twin RG400 configuration. Time to go and
spray the test assembly with water from the rain butt! If there is a
problem I can always put the feeder within the HexBeam centre post - it
just takes a bit more effort!
73,
Steve G3TXQ
Fraser Robertson wrote:
> Hi Steve et al. Some years ago I put up horizontal parallel dipoles for
> 20/15/10m and wanted to feed them with heavy duty 75R twin feeder to avoid
> the weight of a centre balun and coax. Westlake no longer stocked HD 75R
> twin but said their black/red DC power cable worked as a substitute. I found
> this did indeed work ok, with a balun at the bottom end, except whenever it
> rained the swr shot up. Question: does rain have a similar effect on
> 'proper' 75R twin.73 Fraser G4BJM
>
>
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