ME TOO, Dan !
i'm using ALSO a commercial 450 ohm window line (i got it from cable
x-pert, inc.) for a number of years up here, where rain is the norm (!!!),
and ALSO don't really notice any major changes in tuner settings, power
output etc., from wet to dry weather vice versa.
Tuner is a hmbrew Z-matcher (constructed after Bill Orr, W6SAI's articles in
CQ magazines of Aug and Sept 1993), but prior to that I also used the same
'SPC' Transmatch (after Doug De Maw, W1FB), but mine was WITHOUT balun
(instead, I use CHOKE balun all the time, made from 6-8 turns of coiled
RG58A/U with appox. 10-12" dia).
I've used alternately the G5RV, Lofgren W6JJZ's Suburban Multibander and
Paul Carr N4PC's Skywire (horizontal) Loop with this feedline also for about
6-7 years.
It always tunes up readily while changing bands (under the very worst condx
i might hv problem with 15M setting, i've to "extra" carefully fiddling with
both c1 and c2 to have to best SWR ---- but believe it will be easily cured
if i cud take some time to vary the feeder line length a bit !) and so far I
noticed a very slight variation in the setting of C2 only after heavy rain
or thunderstorm.
i don't think it has any "direct" correlation with "conductive path accross
spreaders (conductors?)" you mentioned.
73, bam yb0ko/1
bogor 16136, loc OI33ji
6 38 04 S, 106 48 16 E
ts120v @ 8W (or reduced power TT-Scout 555), n4pc skywire @ 11 mtr
OT:
====
BTW Dan, weeks ago i had problem with my modem and telephone line so i was
"away" for a few weeks. just a matter of curiosity --- hv u rcvd my
off-list mssg dd 2/20/2002 responding to sam's inquiry? ----- hw is he now?
pse pass on the warmest regards from his uncle down here ...............
----- Original Message -----
From: "Dan Presley" <talljazz@teleport.com>
To: "Low Power Amateur Radio Discussion" <qrp-l@Lehigh.EDU>
Sent: Tuesday, March 19, 2002 2:04 PM
Subject: rain and open wire line
> Might seem like a silly question, but what exactly is involved with
> the increased losses with open wire line under rainy conditions? It's
> always been said that wet weather will increase the losses, but I've
> never heard a good explanation of why.Is it creating a conductive
> path across the spreaders? I've used a commercial 450 ohm window line
> for a number of years up here in the northwest where rain is the norm
> :), and don't really notice any major changes in tuner settings,
> power out, etc., from wet to dry weather. Tuner is a Matchbox, but
> prior to that I had a 'SPC' (Doug Demaw special) tuner with a hefty
> balun for the line. I've used the same antenna ( delta loop design
> from N4PC) and feedline for about 6-7 years. It always tunes up
> readily while changing bands, and my 'log' of tuner settings is
> almost always the same year round. Any thoughts?
> --
> Dan Presley-N7CQR-Portland, Or QRP-L #502
> n7cqr@arrl.net
>
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