[TowerTalk] New Tower Standard Update

[donovanf@starpower.net]

For those who missed this last month, copies of TIA-222-G can 
be purchased from TIA, but they are exceptionally expensive. 

However...  there is a pdf presentation on the web that contains 
many of the key differences in TIA-222-G, including the new 
wind and ice zone maps.

http://www.mei1inc.com/NAB-2003presentation.pdf

One of the changes is in the wind zones.   TIA-222-G contains 
over a hundred pages of wind and ice zone information for 
every county in the US.  

TIA-222-G has changed the way that windspeed is specified, 
from the traditional "mile of wind" approach to a three second 
maximum gust specification.  The TIA-222-G minimum wind 
speed requirement (applies to most counties in the US) is now 
90 MPH three second gust, which is equivalent to a 75 
MPH "mile of wind", 65 MPH sustained wind for 10 minutes or 62 
MPH sustained wind for one hour.

Another aspect of TIA-222-G that could impact hams in the 
future is the new requirement to evaluate the risk to human life 
of new tower installations.  When there is a risk to human life 
(for example, if a tower could topple on a residence or a 
populated area), the requirements become much more severe 
than current standards.   For a new tower in a location where 
human life is not at risk, EIA-222-G is very similar to current 
requirements.

73!
Frank
W3LPL

---- Original message ----
>Date: Sat, 19 Nov 2005 06:55:53 -0500
>From: Pete Smith <n4zr at contesting.com> 
>Subject: [TowerTalk] Fwd: New Tower Standard Update  
>To: towertalk at contesting.com
>
>Please pardon the forward, but I thought this was probably of 
general interest
>
>>If you're involved in the purchase, design or installation of 
communications structures you'll want to read this article to 
stay abreast of the status of TIA/EIA-222-G. If you're not, or 
know of other individuals that will benefit from this information, 
please forward this email. 
>>
>> 
>>
>>To G or not to G: that is the question
>>Revision G standard set for January introduction, but 
acceptance may take up to three or more years
>>
>>November 10, 2005 -- TIA/EIA-222-G will take effect 
January 1, 2006, but building departments may be years away 
from enforcing the long-awaited revision of the structural 
standard for antenna supporting structures and antennas.
>>
>>The short answer for the lengthy delay: TIA/EIA-222-G is a 
voluntary standard and has no legal bearing. It only gains 
formidable strength if it's referenced by the International 
Building Code (IBC) or any other code, and the code is adopted 
by a permitting jurisdiction.
>>
>>But the code referencing and adoption process is a long, 
sometimes arduous procedure that can oftentimes take years. 
For additional information, please see:    
<http://www.wirelessestimator.com/breaking_news.cfm>Rev G 
Acceptance 
<http://www.wirelessestimator.com/breaking_news.cfm> . 
>
>73, Pete N4ZR
>The World HF Contest Station Database
>was updated on 23 October 2005
>Over 3000 contest stations at 
>www.pvrc.org/WCSD/WCSDsearch.htm  
>_______________________________________________