[TowerTalk] water in coax

[Gene Smar]

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 at ewing.homedns.org>
Date: 2008/02/14 Thu AM 08:57:01 CST
To: Towertalk List <towertalk at 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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