[TowerTalk] How to waterproof a split coax feed to yagi?0

[K1TTT]

Actually its not that hard... flatten and heavily tin a couple inches of the
braid then put on a layer of duct seal and use scotch 33 or another good
tape to firmly wrap it so it covers any un-tinned braid that you leave for
flexibility and at least part of the tinned end.  Do basically the same for
the center conductor, wrap another layer or two over the whole thing...
usually about 1/3-1/2 a roll of tape for a 6-8" split for a big feedpoint is
about right.


David Robbins K1TTT
e-mail: mailto:k1ttt at arrl.net
web: http://www.k1ttt.net
AR-Cluster node: 145.69MHz or telnet://dxc.k1ttt.net
 

> -----Original Message-----
> From: K7LXC at aol.com [mailto:K7LXC at aol.com]
> Sent: Thursday, August 06, 2009 12:16
> To: towertalk at contesting.com; trappaport at austin.rr.com
> Subject: Re: [TowerTalk] How to waterproof a split coax feed to yagi?0
> 
> 
> In a message dated 8/6/2009 3:26:44 A.M. Pacific Daylight Time,
> towertalk-request at contesting.com writes:
> 
> >  To feed my Force 12 HF yagis, I plan to wind my own coax  baluns (8
> turns of coax, 8" diameter - sound reasonable?), and would like to  simply
> spilt
> the LMR400 coax feedline, with the ground braid going to one side  of the
> dipole element, and the center conductor to the other.
> 
> >  I am wondering what is the best way to **waterproof** the  split coax.
> Is there some type of goop or sealant that has excellent  waterproofing
> and
> UV resistance, that I can use to keep water from seeping  into the coax? I
> would welcome any thoughts and sources....neither Home Depot  or Lowes had
> anything that seemed like it would work.
> 
> 
>         What you're suggesting is  very difficult to waterproof - the
> braid
> just wicks water into your coax where  it typically runs down the coax
> into
> the shack. A better solution is to use  a dipole feed insulator with an
> SO-239. That way you can plug your PL-259 into  it and have the wire ends
> on
> the feedpoint with a weatherproof transition.
> 
> Cheers,
> Steve     K7LXC
> TOWER TECH
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