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Re: [TowerTalk] Rebuilding the TH7

To: "'Dennis W0JX'" <>, <>
Subject: Re: [TowerTalk] Rebuilding the TH7
From: "Michael Ryan" <>
Date: Mon, 4 Feb 2008 22:29:20 -0500
List-post: <>
By the way, the TH7 has FIVE elements on 10mtrs.  Not all the stupendous at
the moment but when the cycle improves and 10 becomes more popular, you may
find it worthwhile.  -Mike

-----Original Message-----
[] On Behalf Of Dennis W0JX
Sent: Monday, February 04, 2008 9:19 PM
Subject: [TowerTalk] Rebuilding the TH7

The TH7 is certainly worth rebuilding. It is in current production by MFJ
and the parts are available if you need them. See the following link:
  I have a TH6DX, the predecessor, still in operation after 30 years. It has
been in five different locations and each time I moved, I just polished the
elements with Scotchbrite or steel wool, replaced hardware with stainless
steel when I could get it locally, and bought a new set of trap caps. Have
never had to clean out the traps although they should be checked for loose
connections and the dirt blown out. Some people use Scotch 33 to tape the
caps on (the wind can blow them loose.)
  Might be worthwhile to spray certain parts with Krlylon clear acrylic,
depending upon your climate. I would not coat the traps or end caps as that
might alter the resonant frequency of the traps. 
  Overall, it is a great and rugged antenna worth keeping. Not the latest
and greatest as far as gain but still very competitive at 60 feet and
higher. My TH6 is at 80 feet and is actually a little too high for 15 and
  73, Dennis W0JX/8

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