I tried this a while back, but I had some little trouble
with the compression fittings rotating around the
hardline outer conductor. Anyway to cure this, or
was it perhaps that the hardline I was using was
on the low side of the tolerance band? The RF
performance seemed okay, but I was worried
that the shield connection might become
intermittent over time.
Thanks,
Mike, W4EF...........................
----- Original Message -----
From: "Gerry Smith" <w6ter@worldnet.att.net>
To: <towertalk@contesting.com>
Sent: Wednesday, July 16, 2003 4:17 PM
Subject: [TowerTalk] Plumbing > Hardline
> Several have asked me to elaborate after my post regarding using
> plumbing fittings to connect to hardline. Here goes:
>
>
>
> I have hardline with a solid aluminum shield. The shield is ½ inch in
> diameter.
>
>
>
> I purchase a plumbing fitting that has a compression coupling on one end
> that is made for ½ inch copper tubing. In other words, the ID of the
> compression end is ½ inch. I use Penetrox and compress the connection to
> the hardline shield. The other end has inside threads for ½ inch OD
> pipe. I drill out the threads with a ½ inch drill. The body of a PL-259
> is ½ inch. I then solder the PL-259 in place (after removing the center
> pin, see below).
>
>
>
> I drill out the center conductor pin of a PL-259 with a bit the size of
> the diameter of the center conductor of my hardline, which is .172 inch.
> The center conductor fits directly, and nicely, into a SO-239. So, I
> have a bit of an air dielectric in the brass fittings but works just
> fine.
>
>
>
> You may have different size hardline, and thusly different dimensions. I
> suggest you take a piece of your hardline, a PL-259, and a SO-239 down
> to your local professional plumbing supplier and ask them to help.
>
>
>
> Gerry Smith, W6TER
>
>
>
>
>
> _______________________________________________
>
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>
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