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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