Then the first thing to do it to figure out what is common between the two
of them.... do they share a feedline to a remote switch? Or is switching
done in the shack? Have you tried the swr meter on a dummy load to see if
it is ok?
David Robbins K1TTT
e-mail: mailto:k1ttt@arrl.net
web: http://wiki.k1ttt.net
AR-Cluster node: 145.69MHz or telnet://k1ttt.net
-----Original Message-----
From: K7LXC@aol.com [mailto:K7LXC@aol.com]
Sent: Friday, December 23, 2011 15:52
To: towertalk@contesting.com; dxdx@optonline.net
Subject: Re: [TowerTalk] SWR Problem Balun or lightning protection?
> This has become a real mystery folks. I checked the SWR on my 3
> element
Steppir today and found that it behaved the SAME as my 5 element 20M mono
band Yagi, i.e., the SWR increases after keying down for a few minutes and
returns to normal after waiting a few seconds. This happened with all bands
on the SteppIR. The antennas are mounted on the same tower about 12ft apart
so I always retract the Steppir elements when using the 20M mono bander to
avoid interaction.
The first thing you should do is to measure the swr with an antenna
analyzer at the antenna feedpoint. Everything else is just complicating
your problem. Then work your way back to find where the culprit is. With 2
antennas exhibiting similar problems, it probably isn't the antenna that's
the problem.
MOST "antenna" problems I've ever encountered were something other than
the antenna; e.g. bad jumper, bad switch, bad meter, etc. The problems were
cured in the shack but the diagnosis started at the feedpoint.
Cheers,
Steve K7LXC
TOWER TECH -
Professional tower services for hams
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