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Re: [TowerTalk] hy-gain th6 trap rebuild

To: "towertalk reflector" <>
Subject: Re: [TowerTalk] hy-gain th6 trap rebuild
From: "Stan Labinsky Jr." <>
Date: Mon, 2 Apr 2012 15:59:23 -0400
List-post: <">>
One thing to be wary of, HDPE it is supposed to NOT be UV stable.  I have 
what looks like a European, 60 or 70 MHz half wave vertical, Uses the Ringo 
matching network with an adjustable telescoping radiator.  The insulator 
that fits between the radiator and the support / grounding sleeve is cracked 
in several places... the places that the sun can get to.  The rest of it 
looks fine, but useless.


----- Original Message ----- 
To: "chris casey" <>; "towertalk reflector" 
Sent: Monday, April 02, 2012 2:28 PM
Subject: Re: [TowerTalk] hy-gain th6 trap rebuild

I've seen these referred as "spider spacers" probably due to the design of 
the cutouts in the center to clear the hardware, etc. I had a bag of these 
that I obtained when I purchased a 14AVQ from a local ham. I'm therefore 
assuming that these parts are available from MFJ/Hygain, or at least they 
were at one time.

I used up all the ones that I had when I rebuilt my TH6 last fall as, I too, 
found most of them cracked and I wasn't able to reuse the ones that came out 
when I open up the traps.

I would like to buy a dozen more to keep on hand.

Maybe someone on TT has some better info.

73, Stew K3ND

 From: chris casey <>
To: towertalk <>
Sent: Monday, April 2, 2012 12:15 PM
Subject: [TowerTalk] hy-gain th6 trap rebuild

After getting out tower down and getting a look at it, several traps
were missing their internal spacers. They had disintegrated and fallen
out after the black caps did the same, the can then shorted across the
coil. Both the 10M driven traps had done this, and this helps explain
why the tuner in the rig would not be happy with 10M.

So being cheap, I brought the 10M coils home and cut up an old cutting
board and made some new spacers. This seems to be fine business
mechanically. I did the whole put it in the microwave and see if it
gets hot to see if rf cares about it, it came out cold. Its HDPE.

I need to make many more of these, another one exploded its spacers
when I pulled the trap apart this morning and several more look worse
for the ware after being exposed after losing their caps. But before
I do so, I wondered if anyone saw any fatal flaw in this plan?

The spacers aren't identified anywhere in the antenna documentation,
only whole trap assemblies. I haven't asked hy-gain about them yet but
I will. Wonder if what I made wouldn't be a bit more sturdy.




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