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Re: Pressurize LDF5-50?
To: CRTech <crtech@crtech.org>
Subject: Re: Pressurize LDF5-50?
From: Kevin Kidd <kkbroadcastengineering@gmail.com>
Date: Fri, 14 Jul 2017 13:59:39 -0500
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In-reply-to: <003801d2fccb$41182df0$c34889d0$@pilgrimradio.com>
References: <003801d2fccb$41182df0$c34889d0$@pilgrimradio.com>

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

Follow-Ups: Mosely SL 9003 T1
(Jim McDermott <jim@spiritfm.org>, 14 Jul 2017 19:25:20 -0000)
RE: Pressurize LDF5-50?
("Bill Hurne" <billhurne@pilgrimradio.com>, 14 Jul 2017 19:28:08 -0000)
Re: Pressurize LDF5-50?
(JIm Turvaville <jimturbo61@yahoo.com>, 14 Jul 2017 19:29:46 -0000)
References: Pressurize LDF5-50?
("Bill Hurne" <billhurne@pilgrimradio.com>, 14 Jul 2017 18:01:56 -0000)
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