[Milsurplus] Coaxial Cable Question

[Byron Tatum]

Hello George-
    Thank you for all of the good info! I have heard mention of the center
conductor movement.I found a carton of nice Kings silver/teflon connectors
for the cable, they are HN-male and female. I believe I will give it a try.
Thanks, Byron.
----- Original Message ----- 
From: "aGEnuine Ham" <gl4d21a at juno.com>
To: <bjtatum at ev1.net>
Cc: <Milsurplus at mailman.qth.net>
Sent: Tuesday, August 03, 2004 3:03 PM
Subject: Re: [Milsurplus] Coaxial Cable Question


> Well, Byron,
>
> Consolidated built a lot of coax, and I never heard then criticized for
> not meeting specs.  RG-17 shield isn't very dense, you have to get into
> the RG-177 double silver plated shields for full coverage.  And the 17A
> designation indicates a later cable with non-contaminating jacket, so it
> should last a while.  I have a 250 foot run of 17 (not-A) out to my LPDA,
> partly underground, which I measured before installation.  I only use it
> up to 30 MHz, and the loss at 30 MHz was considerably less than a dB, so
> in it went.  I don't think any of the braided shield coax is suitable for
> direct burial, however.  I use PVC pipe with numerous drain holes on the
> bottom side, and it seems to stay dry enough in well drained caliche to
> keep me out of trouble.  I run the rotor control cable and a couple of
> runs of Romex in the same pipe, and expect that will likely give problems
> before the coax does.
>
> Oh, and by the way, expect to have to redo a connector on one end or the
> other after about 5 years due to center conductor migration.  Sooner in
> vertical runs, but even when run horizontally, it grows and shrinks with
> temperature changes, which is why no one uses it commercially or
> militarily anymore.
>
> 73,
> George
> W5VPQ
>
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