The military specification (MIL-M-55220) specifies qualification testing that
must be passed by the AB577 mast including side loading.
I can email you a copy if you'd like.
Steve - N1SR
Another happy AB-577 user.
Michael Braun wrote:
> Thanks everyone for your emails.
> The problem with the AB-577 manual is that it does not contain data of
> relevence to a professional engineer. Practically all of the manual
> describes how to use it rather than the materials involved in its
> manufacture. Does anyone know of a study done with these types of things, or
> especially one with regard to wind load? I'd need to be able to provide a
> professional engineer with enough documentation to show that my AB-577 with
> an improved guy system can survive a 90mph wind gust for 3 seconds.
> Michael N3CA
> On 4/15/06, Joe - WD0M <WD0M@centurytel.net> wrote:
>>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
>>>>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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