That's actually not much of a change. Probably due to water droplets
forming at the tips of the elements. 50.125 to 49.900 is only less than 1/2
of 1% change in resonance, not bad.
I'd just tune the antenna for 50.200, so when it "drifts down" in frequency,
it's still resonant within the band.
I have the same antenna and the SWR is very good across at least 300 kHz,
from 50.0 to 50.3 -- which is all I need. "Perfect 1:1" doesn't make it
work better...
-WB2WIK/6
-----Original Message-----
From: Hector Garcia XE2K [mailto:j_hector_garcia@sbcglobal.net]
Sent: Friday, July 27, 2007 1:42 PM
To: Tower Talk
Subject: [TowerTalk] m2 6M7 SWR change with rain
Hi guys:
A friend just install the 6M7 in his office tower
and he report that his antena in the last rains the
swr change from the perfect 50.125 1:1 to 49.9 1:1
when the antena is WET , just dry and the SWR back to
50.125
I have a 6M7JHV in the box to be installed at 150ft
and really i will like to know if adding some clear
spray or paint to the driven will reduce or eliminate
that problem of SWR change when WET.
any solve the problem ? any solution avaliable
or just live with that ?
Hector
Hector Garcia XE2K / XF1K
Mexicali B.C DM22fp
P.O.Box 73
El Centro CA 92244-0073
USA
http:// www.xe2k.net
http://www.dxxe.org
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