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Satellite TV receivers & systems support forums
DISH SETUP: Single sat, Multi-Sat & Motorised
Difference between H-H and polar mount
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<blockquote data-quote="johnsattuk" data-source="post: 225220" data-attributes="member: 183150"><p>Wind is probably the greatest force on the dish, and is often the cause of the demise, but because of the inclined axis, the dish itself exerts a force on the drive system when off centre, and this needs to be added/subtracted to the total loading. Gregorian dishes with a second reflector outboard giving an even heavier loading.</p><p>The feedback to the driving system is torque, how you resist that torque is a matter of design.</p><p>A linear actuator driving a dish, through a lever, may well be stronger than a Motec 2100, which only has a smallish plastic gear to resist the torque.</p><p>I have however seen a faily substantial actuator coupled to a dish via a flimsy lever which would fail long before the actuator did.</p><p></p><p>A Yeager 1224 HH motor has a substantial steel gear and worm, for which you pay.</p><p>The linear actuator no doubt will give the strongest solution from a cost point of view.</p><p></p><p>I don't see them as being different, just different design concepts and solutions to give the same end result. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite8" alt=":D" title="Big Grin :D" loading="lazy" data-shortname=":D" /></p></blockquote><p></p>
[QUOTE="johnsattuk, post: 225220, member: 183150"] Wind is probably the greatest force on the dish, and is often the cause of the demise, but because of the inclined axis, the dish itself exerts a force on the drive system when off centre, and this needs to be added/subtracted to the total loading. Gregorian dishes with a second reflector outboard giving an even heavier loading. The feedback to the driving system is torque, how you resist that torque is a matter of design. A linear actuator driving a dish, through a lever, may well be stronger than a Motec 2100, which only has a smallish plastic gear to resist the torque. I have however seen a faily substantial actuator coupled to a dish via a flimsy lever which would fail long before the actuator did. A Yeager 1224 HH motor has a substantial steel gear and worm, for which you pay. The linear actuator no doubt will give the strongest solution from a cost point of view. I don't see them as being different, just different design concepts and solutions to give the same end result. :D [/QUOTE]
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Satellite TV receivers & systems support forums
DISH SETUP: Single sat, Multi-Sat & Motorised
Difference between H-H and polar mount
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