[amsat-bb] Re: Limits of G-5500?
kb9ups at excite.com
Sun Mar 8 04:11:48 PDT 2009
I'm running a 10 foot dish and have built a drive system including controler that works "very well". Please look at my web page and contact me if you wish..
AMSAT area coordinator, Toledo, Oh.
AMSAT area coordinator, Streator, IL.
From: "Edward Cole" [kl7uw at acsalaska.net]
Date: 03/07/2009 03:38 PM
To: "Mark L. Hammond" <marklhammond at gmail.com>, amsat-bb at amsat.org
Subject: Re: [amsat-bb] Re: Limits of G-5500?
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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