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RE: Pressurize LDF5-50?
To: "'CRTech'" <crtech@crtech.org>
Subject: RE: Pressurize LDF5-50?
From: "Bill Hurne" <billhurne@pilgrimradio.com>
Date: Fri, 14 Jul 2017 15:54:11 -0700
Content-language: en-us
In-reply-to: <CAHL64sG5f-48SQiv3FJPAQZevZHEYf8JoX-bq6LaU=wbqHzJ9g@mail.gmail.com>
References: <003801d2fccb$41182df0$c34889d0$@pilgrimradio.com> <CAHL64sE7p-xZ_vuGv3MgefRYWM8iMBae=McYKQ57UWgOqs+jSg@mail.gmail.com> <004f01d2fcd7$479793d0$d6c6bb70$@pilgrimradio.com> <CAHL64sG5f-48SQiv3FJPAQZevZHEYf8JoX-bq6LaU=wbqHzJ9g@mail.gmail.com>
Thread-index: AQJdrXkLyc6SGEt5I5wUJHHuZnfRgQGPvxldAWudZacCrRbmPaERSEcg

It screws down into the hollow, self-tapping threads.

 

Heard another suggestion to drill a small hole down the center of the threaded center conductor piece.   Would need to drill through about ½ inch of metal to make it hollow all the way through.

 

Bill

 

From: Kevin Kidd [mailto:kkbroadcastengineering@gmail.com]
Sent: Friday, July 14, 2017 2:58 PM
To: CRTech
Subject: Re: [CRTech] Pressurize LDF5-50?

 

That sounds exactly right.  Does the center conductor portion of the connector screw down into the hollow or does it snap in like a DIN?


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

 

On Fri, Jul 14, 2017 at 2:27 PM, Bill Hurne <billhurne@pilgrimradio.com> wrote:

For the L45R connector I thought about making a very small gas groove inside the center conductor where the self-tapping center screw piece threads into the center.   Use a very small file.   Of course the bullet needs the small holes in the Teflon, and feed gas into a 7/8 EIA adapter such as https://www.rfparts.com/adapters/adapters-eiaflange/eiaflange-78/eiaflange78-adapt/rla050-16.html

 

Reasonable?

 

Bill

 

From: Kevin Kidd [mailto:kkbroadcastengineering@gmail.com]
Sent: Friday, July 14, 2017 12:00 PM
To: CRTech
Subject: Re: [CRTech] Pressurize LDF5-50?

 

Bill,

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.

Regards,


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

 

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.

 

Thanks,

 

Bill Hurne

Chief Engineer

The Pilgrim Radio Network

 

 

Follow-Ups: RE: Pressurize LDF5-50?
("Ron Huckeby" <huckebyrj@gmail.com>, 15 Jul 2017 00:27:57 -0000)
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)
RE: Pressurize LDF5-50?
("Bill Hurne" <billhurne@pilgrimradio.com>, 14 Jul 2017 19:28:08 -0000)
Re: Pressurize LDF5-50?
(Kevin Kidd <kkbroadcastengineering@gmail.com>, 14 Jul 2017 21:57:39 -0000)
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