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Re: [TowerTalk] water in coax

To: Gene Smar <ersmar@verizon.net>, Towertalk List <towertalk@contesting.com>, Martin Ewing AA6E <aa6e@ewing.homedns.org>
Subject: Re: [TowerTalk] water in coax
From: Gene Smar <ersmar@verizon.net>
Date: Thu, 14 Feb 2008 09:24:40 -0600 (CST)
List-post: <towertalk@contesting.com">mailto:towertalk@contesting.com>
TT:

     Sorry - it's dry, pressurized air and not nitrogen that is used in 
commercial pressurized coax systems.  Even more complex when driers are 
included.  My apologies.


73 de
Gene Smar  AD3F





From: Gene Smar <ersmar@verizon.net>
Date: 2008/02/14 Thu AM 09:19:32 CST
To: Towertalk List <towertalk@contesting.com>, 
        Martin Ewing AA6E <aa6e@ewing.homedns.org>
Subject: Re: [TowerTalk] water in coax

Martin et al:

     Commercial pressurization systems are pretty complex and cannot be used 
with just ANY coax.  Air dielectric cables, typically used for QRO microwave 
sysems, require nitrogen under pressure to preserve their dielectric strength 
by keeping atmospheric moisture out.  The coax runs are monitored for pressure 
leaks, etc. - a real PITA.  I doubt there are many Amateur installations using 
air dielectric hardline, hence even fewer will need pressurization systems.

     FYI - here's the Andrew page showing the index for such pressurization 
systems in their catalog: 
http://www.andrew.com/products/pressurization/default.aspx .


73 de
Gene Smar  AD3F


 From: Martin Ewing AA6E <aa6e@ewing.homedns.org>
Date: 2008/02/14 Thu AM 08:57:01 CST
To: Towertalk List <towertalk@contesting.com>
Subject: Re: [TowerTalk] water in coax

The pros often pressurize their lines, I believe, to keep water out.  
Have amateurs done this?  What would be involved?  PL-259's aren't going 
to help.

73 Martin AA6E
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