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Re: [TowerTalk] Sealing Pigtails - Opinions?

To: "Ward Silver" <>,"Towertalk Reflector" <>
Subject: Re: [TowerTalk] Sealing Pigtails - Opinions?
From: "Dubovsky, George" <>
Date: Thu, 7 Feb 2008 11:29:22 -0500
List-post: <>

A coax pigtail technique I've used successfully for a long time is to
avoid them - use a pair of connectors. But if the pigtail is
unavoidable, I strip the coax jacket back from the edge of the braid for
perhaps 3/8", then I wrap about 3-5 turns of solid wire (like #14)
around the braid, leaving whatever free length is required. Then, I
quickly solder the coil of wire to the braid - this seals the braid from
wicking and it gives you a solid conductor to make the connection. You
could probably use the same technique for a stranded center conductor,
but I haven't tried that. Seal with RTV/tape, etc.


geo - n4ua

> -----Original Message-----
> From: [mailto:towertalk-
>] On Behalf Of Ward Silver
> Sent: Wednesday, February 06, 2008 5:54 PM
> To: Towertalk Reflector
> Subject: [TowerTalk] Sealing Pigtails - Opinions?
> As long as we're discussing sealing, I have a question about sealing
> pigtails. Waterproofing the end of a coax pigtail can be difficult
> of the exposed braid and the stranded center conductor of most coax.
> wick water back into the cable.  I've attempted waterproofing a couple
> ways - I'm sure the group can suggest some improvements.
> Both methods assume that the jacket has been peeled back and that I
have a
> flat braid pigtail and some center insulator and exposed center
> forming the other pigtail.  Furthermore, the center insulator is solid
> the center conductor is stranded.  Ring or spade terminals are the
> preferred
> termination.
> Method #1 - Crimp on the terminals and solder, flooding the end of the
> wire
> and braid with solder, attempting to fill the interstrand volumes.
> the
> braid terminal, flood with solder back at least 1 cm.  From the center
> conductor terminal, flood with solder down into the center conductor.
> Paint
> entire cable end liberally, but apolitically, with liquid electrical
> up
> to the terminal.  Work the goo into the strands as much as possible.
> Method #2 - Crimp terminal on center conductor and flood with solder
as in
> Method #1. Trim braid to about 1 cm long and solder to a solid jumper
> with terminal soldered on.  Now paint with the liquid electrical tape
> in
> Method #1.
> The goal of both methods is to form a relatively solid barrier to
> being wicked into the cable.  The pigtails formed by either method can
> wrapped with electrical tape, if desired, but the water barrier should
> depend on the tape.
> 73, Ward N0AX
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