[TowerTalk] AB-577/GRC Engineering Specs?

Joe - WD0M WD0M at centurytel.net
Sat Apr 15 15:11:38 EDT 2006

Hi Michael,

If you don't have the technical manual for the 
mast, here's a reference for the HTML version on line:


You can also order the manual on CD from that web 
site, and others (including eBay).   It MAY have 
the technical information you're looking 
for.  All I've been able to find thus far is that 
it withstands 75MPH and 1/2 inch of ice.

That antenna support was intended to hold two 
antennas, model AT-903.  Here is a link to a photo:


If you can find the weight of that antenna, that 
should give you a guideline as to what it will hold.

Tower talk has an archive reference that may help:


I hope these references help you find what you're looking for.


At 11:51 AM 4/15/2006, Jim Lux wrote:
>At 08:31 AM 4/15/2006, Michael Braun wrote:
> >Dear TowerTalk subscribers,
> >
> >Hi - I'm Michael Braun, N3CA.  I am a 17 year old ham and enjoy
> >contesting as my primary interest.
> >
> >About 3 months ago I was lucky enough to procure one of the AB/577 GRC
> >Military masts from a good friend and we successfully installed it at
> >48 feet, assuming that a permit would not be required because it is
> >temporary.
> >
> >I am writing to ask if anyone knows any Professional Engineers that
> >are familiar with the AB/577 GRC 48 foot mast and may have done some
> >complete engineering studies on it related to wind loading and other
> >factors, or anyone who has had such studies done for themselves..
> >While I know that the 6 square feet of antenna I have at the top (48
> >feet) can be adequality
> >handled by the mast, I need to prove this to my county.

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