[amsat-bb] Re: Limits of G-5500?
kl7uw at acsalaska.net
Sat Mar 7 11:02:24 PST 2009
At 05:25 AM 3/7/2009, Mark L. Hammond wrote:
>Recently I acquired a 7.5' dish. It's aluminum with a steel ring
>mount. I estimate the dish weights maybe 50 lbs?
>What is a realistic limit for a Yaesu G-5500 rotator? Would it
>handle a dish of this size/weight if carefully counterbalanced? Or
>is it too big and silly to even consider?
>I know wind load is a concern of course, too. But I imagine keeping
>it close to the ground...
>I've thought about cutting it down in size to reduce weight and wind
>load, but would rather not go that route...
>Mark L. Hammond [N8MH]
Is the G-5500 the same as the B5500? I would not recommend
that. The issue is not the weight but the wind area forces. A 7.5
foot dish can have 2000-lbs of wind force at 70mph. What is
recommended is a HD azimuth rotator coupled with a satellite dish
actuator arm for elevation. I do this with my 2m-eme array (four
21-foot booms on a 12x12 foot H-frame). The B5500/B5400 will handle
up to a 3-foot dish probably at maximum. I have had a 33-inch offset
feed dish on my B5400 along with a long 432 and 1296 yagis with no
problems (knock on wood).
Satellite actuators are pretty cheap for running a dish.
73, Ed - KL7UW
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