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Re: Pressurize LDF5-50?
To: CRTech <crtech@crtech.org>
Subject: Re: Pressurize LDF5-50?
From: JIm Turvaville <jimturbo61@yahoo.com>
Date: Fri, 14 Jul 2017 19:29:40 +0000 (UTC)
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References: <003801d2fccb$41182df0$c34889d0$@pilgrimradio.com> <CAHL64sE7p-xZ_vuGv3MgefRYWM8iMBae=McYKQ57UWgOqs+jSg@mail.gmail.com>
Reply-to: JIm Turvaville <jimturbo61@yahoo.com>
Indeed there was (maybe still) a connector made by RFS for their 7/8" foam cable that had a gas port to use the hollow center to pressurize the antenna.  I have a client in CO still using that feature on his station.  I'm not aware the Andrew ever made it, or at least I've not seen one by them. 
Jim "Turbo" Turvaville 
SBE Certified Radio Engineer 
Turbo Technical Services 
 PH: 719-459-1859 

From: Kevin Kidd <kkbroadcastengineering@gmail.com>
To: CRTech <crtech@crtech.org>
Sent: Friday, July 14, 2017 1:59 PM
Subject: Re: [CRTech] Pressurize LDF5-50?


It at least has been done in the past but I don't know of any recent systems built like that.  Foam type flange connectors "should" seal well enough to hold pressure but probably not as well as the connectors on air line.  I do recall reading somewhere that some modifications had to be made to the foam connectors to get a good flow of gas out of the hollow center conductor.  There may be (or may have been) a special foam connector for the purpose.


Kevin C. Kidd, CSRE/AMD
Lawrenceburg, TN
AM Ground Systems Company  -  WD4RAT
kkidd@kkbc.com  --  866-22-RADIO -- 866-227-2346

On Fri, Jul 14, 2017 at 1:01 PM, Bill Hurne <billhurne@pilgrimradio.com> wrote:
We’re replacing an antenna fed by LDF5-50 coax up the tower.   At the antenna is a 1 5/8 EIA connector, with a reducer to 7/8 EIA.
At the bottom end is a 7/8 EIA flange.    We would like to pressurize the antenna.
Current connectors at the top and bottom are L45R that aren’t pressurizable.
Are there pressurizable 7/8 inch EIA connectors available for LDF5-50?
I was told we can pressurize this coax and antenna by sending the nitrogen up the hollow center conductor.
Bill Hurne
Chief Engineer
The Pilgrim Radio Network

References: Pressurize LDF5-50?
("Bill Hurne" <billhurne@pilgrimradio.com>, 14 Jul 2017 18:01:56 -0000)
Re: Pressurize LDF5-50?
(Kevin Kidd <kkbroadcastengineering@gmail.com>, 14 Jul 2017 18:59:46 -0000)
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