[Antennas] Twin lead 450 Ohm

2002年12月11日 09:57:03 -0800 (PST)

I cut every other spacer out of my windowed ladder
line and rub automotive paste wax on it so the water
beads up/runs off. The difference between wet and dry
is far less this way. It doesn't really snow where I
live near Seattle, WA so that's not a concern for me.
It's important to note the referred study was from 50
to 150 Mhz (VHF) and they used a wetting agent on the
line to create a *very* worst case for the 'wet'
readings. Re-run those tests at 30MHz w/ paste wax
rubbed on the line -- those are numbers I'd like to
see.
The best thing is to build your own 'real' balanced
line of course, but I've got 600' of it feeding all my
different antennas so I use heavy duty 14AWG windowed
ladder line... I don't like the light-duty stuff from
Wireman but I'm sure it has it's place (it's very
lightweight!).
I use 14AWG stranded hard drawn copper wire and 1/2"
OD 'CPVC' for my spacers. It's super and easy to build
and it doesn't change between wet and dry. The CPVC is
the tan colored stuff they use to run potable water in
RV's and trailers. It's thin walled and stands up to
UV well. Uh, not that we GET any UV here in wetland.
73, Steve N4SL Machias, WA CN88
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