Re: OT Wet 450 ohm ladder line

Posted by Vic K2VCO on Mar 17, 2009; 3:59pm
URL: http://elecraft.85.s1.nabble.com/OT-Wet-450-ohm-ladder-line-tp2491549p2492251.html

Geoffrey Mackenzie-Kennedy wrote:
> Sorry for an off-topic question. Does anyone have any information about the
> dry vs wet characteristics of "450 ohm" ladder line? I have never used this
> type of line, but I might have to use it for "mechanical" reasons to feed
> another antenna now being built. I am told that its characteristics change
> when wet from rain, but which characteristics change and by how much at HF.
> A remote ATU to compensate is not to be used with this particular antenna /
> feeder.

I don't have the quantitative data that Geoff wants, but my experience was that when
feeding a 40-meter dipole with the stuff, the tuning changed significantly when it rained.
I don't know what actually accounts for this. Some people have suggested that waxing the
line reduces the effect.
--
73,
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco
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