Tower Icing Pictures in Wireless Service Providers http://www.dslreports.com/forum/r17660539 en Sat, 28 Nov 2009 17:29:00 EDT Sat, 28 Nov 2009 17:29:00 EDT Re: I Found More http://www.dslreports.com/forum/remark,17820585 John Galt :
said by LLigetfa See Profile :

John has so little tower above the shield...
Oh, this is not MY site...just some pics that I found somewhere that illustrate the issues associated with icing.
Since in my sightings they seem to always be above the dish (never below), I reasoned that they were for ice fall protection not RF shielding. Mind you, where I have seen them, they had considerably more tower above them than shown in John's pics and there was always antennas above them that might benefit from RF shielding.
They serve both purposes so that all works out. But I will tell you this...falling icing is a real danger to life and property.

Not only can it cause the tower to fail, but falling chunks can put you in the permanent "big sleep"...hard hat or not.

Remember, be careful out there.

;)
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A is A]]> http://www.dslreports.com/forum/remark,17820585 Mon, 12 Feb 2007 18:48:23 EDT Re: I Found More http://www.dslreports.com/forum/remark,17819082 AMD Phreak : I never thought about them as RF shields. It would make sense considering the entire contraption is quality steel, which is tied to the tower....one gigantic grounded structure, would for sure do the suggested job.]]> http://www.dslreports.com/forum/remark,17819082 Mon, 12 Feb 2007 15:11:19 EDT Re: I Found More http://www.dslreports.com/forum/remark,17818723 LLigetfa :
said by lutful See Profile :

Snow and ice is the main concern, but the metal grids also block stray sidelobes.
I was looking for some rationale for why some towers have them and others don't. John has so little tower above the shield to build up ice that I thought they may be for RF shielding.

Since in my sightings they seem to always be above the dish (never below), I reasoned that they were for ice fall protection not RF shielding. Mind you, where I have seen them, they had considerably more tower above them than shown in John's pics and there was always antennas above them that might benefit from RF shielding.]]> http://www.dslreports.com/forum/remark,17818723 Mon, 12 Feb 2007 14:16:38 EDT Re: I Found More http://www.dslreports.com/forum/remark,17818593 lutful :
said by LLigetfa See Profile :

Are those shields above the dishes to protect from falling ice or radio waves?
Snow and ice is the main concern, but the metal grids also block stray sidelobes.]]> http://www.dslreports.com/forum/remark,17818593 Mon, 12 Feb 2007 13:52:31 EDT Re: I Found More http://www.dslreports.com/forum/remark,17812649 AMD Phreak : That is correct. They protect the dish from getting ripped off the tower.

Last march or so my buddy from work and I went to one of our mountain tops to do some work. I saw an open bay VHF dipole snapped in half from ice buildup and having ice fall down on it.

Dishes either get torn off the tower, or if they do not have radomes on them (which is stupid to not put one on if you are going on a mountain site) the feedhorns get torn off.

I heard on tuesday that one of the sites that we take care of for some one had the solar panels torn off the tower from snow and ice buildup. The tech saw the frames that hold the solar panels on the ground, but there was not any solar cells to be found. They probably got buried in the snow or they shattered and then got buried. We wont know until this june or July when things melt. FWIW this site is about a 30 mile snowmachine ride from the nearest main road....or a helecopter ride, which is how the tech got in.
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-- AT&T]]> http://www.dslreports.com/forum/remark,17812649 Sun, 11 Feb 2007 13:40:23 EDT Re: I Found More http://www.dslreports.com/forum/remark,17811728 LLigetfa : Are those shields above the dishes to protect from falling ice or radio waves?]]> http://www.dslreports.com/forum/remark,17811728 Sun, 11 Feb 2007 09:57:01 EDT I Found More http://www.dslreports.com/forum/remark,17811180 John Galt : I found these on one of my hard drives from a while ago...

Now I remember!

;)

Warning: These are the full size pics in the 2 MB range...so you can enjoy every ice crystal.
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A is A
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More Not Summer
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Summer
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Not Summer
]]> http://www.dslreports.com/forum/remark,17811180 Sun, 11 Feb 2007 04:16:13 EDT Re: Tower Icing Pictures http://www.dslreports.com/forum/remark,17664098 LeeWL : Here are some of the WRAL and WPTF TV towers in Raleigh NC that fell after a December 10, 1989 Ice storm. All the ice is gone in thse of course.

»www.oldradio.com/archives/warsto···WRAL.htm

Not everyday that two 2,000 foot towers within a mile of each other collapes.]]> http://www.dslreports.com/forum/remark,17664098 Thu, 18 Jan 2007 10:27:27 EDT Re: Tower Icing Pictures http://www.dslreports.com/forum/remark,17663969 dgilbert : i wish i had a scanner to upload some pics from the ice storm of '94. we lost a couple 323 ft towers in that one.

we had several more go down that we rent space on, and quite a few customer towers. only a few towers in a 50 mile radius even with stood it.

our 180' Rohn 25 tower behind the shop was a solid block of ice. the guides had 4-5 inches on them, but somehow it stood.

i found out in '01 or '02 that a VERY thin glaze of ice on a sat dish will screw everything up. i had to make a 700+ mile round trip to clear ice off most of the dishes at our sites.
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Lack of Preparation on YOUR Part does NOT Constitute an Emergency on Mine!]]> http://www.dslreports.com/forum/remark,17663969 Thu, 18 Jan 2007 10:02:30 EDT Re: Tower Icing Pictures http://www.dslreports.com/forum/remark,17663615 sabersaw : enjoy.

»www.hamsexy.com/cms/?p=714]]> http://www.dslreports.com/forum/remark,17663615 Thu, 18 Jan 2007 08:50:34 EDT Re: Tower Icing Pictures http://www.dslreports.com/forum/remark,17662446 LLigetfa : Dunno, just found the pic on the internet.]]> http://www.dslreports.com/forum/remark,17662446 Wed, 17 Jan 2007 23:38:14 EDT Re: Tower Icing Pictures http://www.dslreports.com/forum/remark,17662357 viperm : Question is did it stil function?]]> http://www.dslreports.com/forum/remark,17662357 Wed, 17 Jan 2007 23:19:22 EDT Re: Tower Icing Pictures http://www.dslreports.com/forum/remark,17660780 AMD Phreak : haha....thats a great photo! :D]]> http://www.dslreports.com/forum/remark,17660780 Wed, 17 Jan 2007 19:10:51 EDT Re: Tower Icing Pictures http://www.dslreports.com/forum/remark,17660752 LLigetfa : Like this?
]]> http://www.dslreports.com/forum/remark,17660752 Wed, 17 Jan 2007 19:07:02 EDT Tower Icing Pictures http://www.dslreports.com/forum/remark,17660539 John Galt : I am looking for some good reasonable pics of tower/site icing.

I am looking for some in particular that show what is called "rime ice"...very nasty stuff.

Post here or links...

Thanks!

;)
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A is A]]> http://www.dslreports.com/forum/remark,17660539 Wed, 17 Jan 2007 18:30:34 EDT