Note: you do have to be careful welding galvanized metal because of
poisonous gases IIRC,
WB
-----Original Message-----
From: Jim Turvaville [mailto:turbo@wayfm.com]
Sent: Wednesday, November 29, 2006 3:15 PM
To: 'CRTech'
Subject: RE: [CRTech] Ice Bridge
Note on even the tall towers that the ice bridge material is the galvanized
version of the expanded metal used on those honkin' Texas BBQ grills. My
brother owns a welding shop and has made them, that's where I got the idea.
KJAB's tower is only 94 meters, so the conventional steel grating, or good
2x6's should provide protection to any ice that may form in Mexico Missouri.
Jim "Turbo" Turvaville, CSRE, CBNT
Corporate Expansion Specialist
WAY-FM Media Group, Inc. – Colorado Springs, CO
Ph: 719-533-0300 Fax: 719-278-4339
-----Original Message-----
From: Michael Barnes [mailto:mbarnes@srnradio.com]
Sent: Wednesday, November 29, 2006 1:18 PM
To: CRTech
Subject: Re: [CRTech] Ice Bridge
Keep in mind that icing high on a tall tower is a lot different than at
ground level. In McAllen, Texas, almost as far south as you can get in
the U.S. we had antenna icing problems a couple times a year at 1200
feet. Once we had coax damage in Laredo from ice falling from the 500
foot tower.
I once visited a site in Nebraska. The transmitter facility was
actually underground at the base of the 1500 foot tower. The walkway
into the facility was covered out almost 100 feet with a conventional
sheet metal type canopy. On top of that were pressure treated 4X4s with
4-6 inches of dirt and sod over that. Every couple years or so, they
still had an icicle sufficient to penetrate it. They had pictures of
vehicles in the parking lot damaged by falling ice. It is nothing to
fool around with.
Never skimp on safety. It just ain't worth it in the long run.
Michael
Jim Turvaville wrote:
> Scrap tower sections (Rohn 25 or 45) make excellent waveguide bridges at
> decent lengths and with proper support on longer runs. They also give
> plenty of places to support coax, etc.
> For ice protection, get some expanded metal material (like they make BBQ
> grills from) and attach it in sections on top of the horizontal tower
> sections. (Finding a local machine or welding shop can give you lots of
> ideas of metal materials available for this purpose) If you're really
tight
> on budget, then pressure treated 2x6's make excellent ice protection above
> your coax runs. They will last for several years without rotting and will
> cost much less than the expanded metal grating.
> YMMV.
>
> Jim "Turbo" Turvaville, CSRE, CBNT
> Corporate Expansion Specialist
> WAY-FM Media Group, Inc. – Colorado Springs, CO
> Ph: 719-533-0300 Fax: 719-278-4339
>
>
>
> -----Original Message-----
> From: KJAB Christian Radio [mailto:kjabtech@kjab.com]
> Sent: Wednesday, November 29, 2006 11:19 AM
> To: CRTech
> Subject: [CRTech] Ice Bridge
>
> I am looking for an inexpensive but affective plan for an ice bridge to
> protect our 1"5/8 coax running from building to tower. About 25'. We are
> in Central Missouri, so we do not have to much trouble with ice, but we
need
> to be prepared. Can anyone help?
> Kevin Weber
> KJAB Christian Radio
> www.kjab.com
> --
---------------------------------------------------------------------
For CRTech resources visit http://CRTech.org/
To unsubscribe, e-mail: crtech-unsubscribe@crtech.org
List problems? E-mail: TechStaff@CRTech.org
---------------------------------------------------------------------
For CRTech resources visit http://CRTech.org/
To unsubscribe, e-mail: crtech-unsubscribe@crtech.org
List problems? E-mail: TechStaff@CRTech.org
|