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Path: utzoo!watmath!clyde!cbosgd!ukma!psuvm.bitnet!psuvax1!burdvax!sdcrdcf!hplabs!intelca!qantel!lll-crg!seismo!brl-tgr!tgr!price%marlin@nosc.ARPA
From: price%marlin@nosc.ARPA (James N. Price)
Newsgroups: net.ham-radio
Subject: Need help to repair TH3 damage
Message-ID: <731@brl-tgr.ARPA>
Date: Mon, 16-Dec-85 12:08:25 EST
Article-I.D.: brl-tgr.731
Posted: Mon Dec 16 12:08:25 1985
Date-Received: Sat, 21-Dec-85 04:46:37 EST
Sender: news@brl-tgr.ARPA
Lines: 24

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Gentlemen--in a hellacious wind here in San Diego last week, my
HyGain TH3JRS tri-bander sustained some damage that I'm having
trouble sleuthing out.  There is no obvious physical damage to
the beam (I haven't lowered it yet, but between my Mk 1 eyeball
and looking thru binoculars everything looks OK).  However it
behaves as if it weren't an antenna any longer.

To wit--in its previous state, the beam had a normal SWR curve,
dipping to near 1:1 in the CW portion of 20 and 15, and around
28.5 on 10.  Post wind damage, the SWR is greater than 2.5:1 over
the whole frequency range of each band, and gets as high as 5:1
in places.

What's the most likely failure mode?  Has one side of the coax
come loose from the balun? (I do have the HyGain balun).  Has a
trap shorted out (or opened up) on the driven element or any
element for that matter?  This is my first beam so I literally
don't know where to start in fixing it.  Taking it down, as with
all beams, is a big production, so I'd like to have a game plan
before I lower it.  Any help will be much appreciated.

73rds--Jim Price, K6ZH, PRICE@NOSC.ARPA
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