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Satellite TV receivers & systems support forums
DISH SETUP: Single sat, Multi-Sat & Motorised
My Channel Master 1.8 project.
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<blockquote data-quote="Channel Hopper" data-source="post: 1124928" data-attributes="member: 175144"><p>Not just at the 180 degree point , at close to 0 degree there is also an error since the two end points of the actuator can never actually meet up. The minimum I have been able to attain is some 2" and that is with cutting back or sacrificing the weather boot on the end of the arm.</p><p></p><p>On a 1.8m dish it would equate to another 5 or so degrees of error within your calculations</p><p></p><p>In almost all polarmount systems for real enthusiasts, where there is no restriction to full travel (often the wall the mount is bolted to means a compromise) I have tried to use the largest actuator feasible, with the rotating points set as far from each other as is possible, creating a near equilateral triangle around true south. This often means drilling custom holes in the metalwork fore and aft to enable the ideal position Not only are the forces minimised in movement east and west giving the positioning box an easy life, the pulses from the actuator remain relatively linear on a per degree basis until near the extreme ends of actuator travel.</p><p></p><p>Slightly off topic, many years ago for one client where there was no chance of getting the dish to the low elevation satellites (and at the same time keep it hidden from twitching curtains on the balcony opposite), I used a scissor arrangement (not unlike a car jacking unit) to keep the actuator parallel to the polarmount just to keep the feedarm from extending over the rails.</p></blockquote><p></p>
[QUOTE="Channel Hopper, post: 1124928, member: 175144"] Not just at the 180 degree point , at close to 0 degree there is also an error since the two end points of the actuator can never actually meet up. The minimum I have been able to attain is some 2" and that is with cutting back or sacrificing the weather boot on the end of the arm. On a 1.8m dish it would equate to another 5 or so degrees of error within your calculations In almost all polarmount systems for real enthusiasts, where there is no restriction to full travel (often the wall the mount is bolted to means a compromise) I have tried to use the largest actuator feasible, with the rotating points set as far from each other as is possible, creating a near equilateral triangle around true south. This often means drilling custom holes in the metalwork fore and aft to enable the ideal position Not only are the forces minimised in movement east and west giving the positioning box an easy life, the pulses from the actuator remain relatively linear on a per degree basis until near the extreme ends of actuator travel. Slightly off topic, many years ago for one client where there was no chance of getting the dish to the low elevation satellites (and at the same time keep it hidden from twitching curtains on the balcony opposite), I used a scissor arrangement (not unlike a car jacking unit) to keep the actuator parallel to the polarmount just to keep the feedarm from extending over the rails. [/QUOTE]
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Satellite TV receivers & systems support forums
DISH SETUP: Single sat, Multi-Sat & Motorised
My Channel Master 1.8 project.
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