[TowerTalk] Rebuilding a TH-3, advice sought.

[Mark Robinson]

When I was cleaning up motorbike parts, I used a brass brush on an electric 
drill with kerosene as a lubricant.


Mark N1UK


----- Original Message ----- 
From: "Chet" <chetmoore at cox.net>
To: <k3hx at juno.com>; <towertalk at contesting.com>
Sent: Saturday, 23 July, 2011 6:31 PM
Subject: Re: [TowerTalk] Rebuilding a TH-3, advice sought.


> Buy the rebuild kit which comes with all new hardware, trap covers, clamps
> etc.  I think the kit was 39 bux when I purchased it about 6 years ago. 
> I
> used scotch brite to buff up the elements but if I were to do it again, I
> would consider steel wool on an electric drill. Sounds like you don't need
> the  end caps so maybe you can buy the hardware kit without the traps.  I
> put mine up as a mult antenna on a 50 foot rocket launcher.  Even using 
> the
> original hygain balun which is  only rated at 1 KW,  mine worked fine at 
> the
> full 1500 watt before some one pointed out that it was only rated for 1000
> W.  I only used it on the cw weekend in the cw bands, its cut for the  cw
> band so
> The swr was as advertised.  With high swr, it might have been a different
> story.  Next time it goes up I will use one of the force 12  B-1 baluns.
>
> 73
>
> Chet N4fX
>
>
> -----Original Message-----
> From: towertalk-bounces at contesting.com
> [mailto:towertalk-bounces at contesting.com] On Behalf Of k3hx at juno.com
> Sent: Saturday, July 23, 2011 6:15 PM
> To: towertalk at contesting.com
> Subject: [TowerTalk] Rebuilding a TH-3, advice sought.
>
> I'm rebuilding a TH-3 which has been stored under a shed for at least a
> decade.  The elements are now oxidized to a dark grey with parts of the
> elements having bumps of white powder on them.
>
> The trap endcaps are blistered and split, replacements are on hand.
>
> I'd appreciate any hits, tips, pearls of wisdom, advice, cautions or
> experience the reader would care to share.
>
> In particular, I do not look forward to removing the oxidation from the
> elements with abrasive sponges although I'm willing to do so to assure a
> good job.  Is there some manner of vile chemistry I can dip the 
> disassembled
> elements into, perhaps in a long, shallow tray that will make the job less
> labor-intensive?
>
> Also concerned about the traps and assuring that they will not fail in
> service.  (100w maximum, most of the time...QRP..HI!)
>
> Thanks,
>
> Tim
>
>
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