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RE: Pressurize LDF5-50?
To: "'CRTech'" <crtech@crtech.org>
Subject: RE: Pressurize LDF5-50?
From: "Ron Huckeby" <huckebyrj@gmail.com>
Date: Fri, 14 Jul 2017 18:27:49 -0600
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Bill:

 

The seal on the L45R is just an o-ring. I don’t think it is up to the pressure. I am fighting with leaking antennas in Billings right now and I think you would be better off just replacing the line with air line. A well done installation that is trouble free is less expensive that calling out the tower crew frequently to repair things or ultimately replace the line because it isn’t working.

 

Just my Friday afternoon 2 cents worth after replacing Ubiquiti M900 radios with Digi International 900 MHz Ethernet radios. The consumer grade radios didn’t last hooked to an STL antenna through a MFC STL/ISM diplexer on a grounded base AM tower. After several failures, it was time to move on…

Happy Friday,

 

Ron Huckeby, CBRE

Broadcast Engineer

Butte, Montana

406.491.4998

200 pixelSBECertifiedLogo2015

 

From: Bill Hurne [mailto:billhurne@pilgrimradio.com]
Sent: Friday, July 14, 2017 4:54 PM
To: 'CRTech' <crtech@crtech.org>
Subject: RE: [CRTech] Pressurize LDF5-50?

 

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

 

 

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)
RE: Pressurize LDF5-50?
("Bill Hurne" <billhurne@pilgrimradio.com>, 14 Jul 2017 22:54:25 -0000)
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