[TowerTalk] Hy Gain TH6-DXX

[Fred Hopengarten]

On Wed, 10 May 2000 15:44:11 -0700 KB7WW Art Moe <kb7ww@chatusa.com>
writes:
> 
> I bought a TH6-DXX from an estate, new in box, and was wondering
> before I start to assemble it if any one has any modification for
> it??? 
> 
> Having had other HY-Gain antennas over the years I plan on
> changing all the hardware to stainless steel as I live in a town
> with a paper mill and there is a bit of sulpher in the air.  Not
> as bad as it used to be, but there is still some there.

K1VR:  Stainless steel nuts and bolts are a good idea.  You won't regret
it.  Also, abandon the old Hy-Gain system of holding the element together
(if this is an old TH6).  Use stainless steel straps/clamps.  Be sure the
worm screw is also SS.

Drill holes on the bottom side of the plastic end caps to avoid
collecting rain.

Fred Hopengarten K1VR                        
hopengarten@post.harvard.edu
Six Willarch Road * Lincoln, MA 01773-5105
781/259-0088 *eFax 419/858-2421

From: k1vr
Full-Name: Fred Hopengarten
Subject: Re: [TowerTalk] TH6DXX Problem?

 On Wed, 30 Sep 1998 23:41:34 -0400 (EDT) Mike Sims <nasfred@1bigred.com>
writes:
 > >The TH6DXX problem is too much reflected power (100 w reflected for 
>1000
 watts indicated forward) on 15 meters

K1VR:  The usual problems with a TH6 (whether 15, 20 or 10 meters) are
something IN the trap -- or the trap.  Here are my experiences:

  *	On one occasion I found a carbon path on the coil form and a broken
wire. Fix:  Stretched the wire 1/4 inch and filed out the carbon path. It
has been fine ever since.
  *	I've also found critters, or rather the shells of critters.  I don't
know what it was, but it looked like the shell of a moth.  Sometimes bugs
just get into a trap and you must simply use compressed air to clean the
trap.
  *	And then there is the rain problem.  Some TH6's collect rain in the
bottom of the outer trap cap. A small drill hole on bottom side of the
outer end (so that the natural droop makes this the place that water
collects) solves the problem, but also creates a place for critters to
enter. I drill the holes and clean the traps once a decade, whether I
need to or not.

  	I've never heard of a TH6 problem that wasn't one of those three
(except for two other types of problem which come to mind, but they
aren't cause problems on all three bands, not just one).  				Fred K1VR

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