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Satellite TV receivers & systems support forums
DISH SETUP: Single sat, Multi-Sat & Motorised
Traditional vs Modified Elevation/Declination Angles
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<blockquote data-quote="Hyperopia" data-source="post: 1129617" data-attributes="member: 417578"><p>I agree with your point of view regarding the peaking at your closest to due South satellite. I think that most folks (myself included) use that method to ‘calibrate’ at the centre of their arc.</p><p></p><p>I had been a motorised sat user for quite a while before I read about modified inclination and declination, and initially, I couldn’t see the point. My inclination was set at 90° minus local latitude, and I just watched the signal strength and quality as I adjusted declination on Thor until it peaked – Job done! … Or almost done, it seems. Sure – I was tracking the arc quite well and accepting the drop-off near the extremes as attenuation of the signal from passing through a bit more atmosphere and maybe the occasional bit of foliage or ground clutter on the way to my dish. (Life is full of little disappointments).</p><p></p><p>I use a program called Fusion 360 for designing components to be made on my 3d printer. I played around with the geometric design features, creating the Earth and Clarke belt to scale, then used various cones, disks, and arcs on different planes until I could visualise how errors in tracking were present at the extremes of arc, and how modified inclination/declination could be used to mitigate this.</p><p></p><p>I included a screenshot of the spreadsheet in my original post so folks could see that I wasn’t using ‘smoke and mirrors’ to reach a solution. If anyone is interested, I can supply the formulas behind all the variables. Those who are just looking to set up a new polar mount from scratch would be interested in fewer items of data.</p><p></p><p>Simply use the formula and the local latitude to calculate the correction factor, then subtract this from ‘simple inclination’ and finally peak the signal at the due South satellite using the declination adjustment as normal. Happy tracking from there!</p></blockquote><p></p>
[QUOTE="Hyperopia, post: 1129617, member: 417578"] I agree with your point of view regarding the peaking at your closest to due South satellite. I think that most folks (myself included) use that method to ‘calibrate’ at the centre of their arc. I had been a motorised sat user for quite a while before I read about modified inclination and declination, and initially, I couldn’t see the point. My inclination was set at 90° minus local latitude, and I just watched the signal strength and quality as I adjusted declination on Thor until it peaked – Job done! … Or almost done, it seems. Sure – I was tracking the arc quite well and accepting the drop-off near the extremes as attenuation of the signal from passing through a bit more atmosphere and maybe the occasional bit of foliage or ground clutter on the way to my dish. (Life is full of little disappointments). I use a program called Fusion 360 for designing components to be made on my 3d printer. I played around with the geometric design features, creating the Earth and Clarke belt to scale, then used various cones, disks, and arcs on different planes until I could visualise how errors in tracking were present at the extremes of arc, and how modified inclination/declination could be used to mitigate this. I included a screenshot of the spreadsheet in my original post so folks could see that I wasn’t using ‘smoke and mirrors’ to reach a solution. If anyone is interested, I can supply the formulas behind all the variables. Those who are just looking to set up a new polar mount from scratch would be interested in fewer items of data. Simply use the formula and the local latitude to calculate the correction factor, then subtract this from ‘simple inclination’ and finally peak the signal at the due South satellite using the declination adjustment as normal. Happy tracking from there! [/QUOTE]
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Satellite TV receivers & systems support forums
DISH SETUP: Single sat, Multi-Sat & Motorised
Traditional vs Modified Elevation/Declination Angles
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