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DISH SETUP: Single sat, Multi-Sat & Motorised
Problems with motorized 68 cm Penta on some East satellites
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<blockquote data-quote="bobbywise" data-source="post: 636497" data-attributes="member: 331837"><p>Hi everyone,</p><p></p><p>Thanks for all your feedback.</p><p>I suspect the problem may lie with the fact the dish is slightly up the pole (and lower than required). Also, I used a spirit level and the pole was pretty flush, but I also suspect the weight of this dish is taking it slightly off the plumb line.</p><p></p><p>My Lat is 47.1884 and my Long is -1.5325. My motor angle is 30°, and I need to deduct the declination angle (which depends on my long/lat) to determine the dish elevation. Gaaps calculator suggest for a 30° motor an antenna elevation of 22.8°, whilst Dishpointer suggest 23° (i.e. declination angle of 7°).</p><p></p><p>I'm pretty convinced the dish on the motor is bang in the middle - although it's slightly tricky to make sure. It's a shame there are no alignment holes on the dish fixations and the motor pole to ensure you are bang in the middle. I pretty much had the old an new dish visually in the middle of the pole, and never got 39E, so I don't think the problem lies with my ability to get the dish bang in the middle of the motor pole.</p><p></p><p>It's true I originally found true south using Astra 28, although all the other sats came in at the expected angles on the motor. However, when I re-perform alignment, I'll be sure to use 1W.</p><p></p><p>For me, 1W corresponds to 0.6E and 0.8W corresponds to 0.8E. It's a shame the Foxsat HDR does not have GOTOX functionality, so I will have to manually move the motor to 0.6E when I align to 1W. This might be a bit tricky without the GOTOX function <img src="https://www.satellites.co.uk/styles/default/xenforo/smilies/sad.png" class="smilie" loading="lazy" alt=":(" title="Sad :(" data-shortname=":(" /></p><p></p><p>Just out of curiosity, the GAPPS calculator gives a change in the direction of the difference, e.g.</p><p></p><p>45W => 47.5 (diff +2.5)</p><p>30W => 31.3W (diff +1.3)</p><p>22W => 22.6W (diff +0.6)</p><p>15W => 14.9W (diff -0.1)</p><p>0.8W=> 0.8E (diff - 1.0)</p><p>1W => 0.6E (diff -1.6)</p><p>7E => 9.4E (diff -2.4)</p><p>10E => 12.7E (diff -2.7)</p><p>13E => 16.1E (diff -3.1) </p><p>26E => 30.3E (diff -4.3)</p><p>39E => 44.3E (diff -5.3)</p><p></p><p>I remember seeing some info on the net that suggested you simply compensate "constantly" by you Long value, e.g. in my case 1.5325W, 13E would be 16.5325, 1W would be 0.5325E etc. (a constant diff of -1.5325), but I suspect this information to be wrong, and believe the GAAPS calculator more. Do you gurus agree with the GAAP calculator, and how the difference between motor angle and different satellite angles actually varies (i.e. gets bigger toward either E or W extreme like with the values above) ?</p><p></p><p>For now, the dish install is on the chimney furthest away from the trees, as follows</p><p></p><p></p><p>E S</p><p></p><p>_____________________</p><p></p><p>Trees</p><p></p><p>______________________</p><p></p><p></p><p></p><p>______</p><p>! !</p><p>! !</p><p>!______!----- Dish</p><p></p><p></p><p>So you see, this is why I have it up the pole (to not touch chimney)</p><p></p><p>I will change to the following, so that I can put the motor between the two arms of the bracket.</p><p></p><p></p><p>Dish </p><p>!</p><p>_______!</p><p>! ! </p><p>! !</p><p>!_______!</p><p></p><p></p><p>Before I make any movements, I'll post you up the photos to give me your opinions on the trees.</p><p></p><p>There is a minute chance the trees are the problem, but my gut feeling from what you all tell me, is that the pole not 100% flush, plus dish up pole (not between two arms, above 2nd arm) is distorting me from the arc on the high Easts.</p><p></p><p>As a test, I'll also see if I can get 31.5W -- I'm pretty sure I will as I can get 30W.</p><p></p><p>Cheers,</p><p></p><p>Rob</p></blockquote><p></p>
[QUOTE="bobbywise, post: 636497, member: 331837"] Hi everyone, Thanks for all your feedback. I suspect the problem may lie with the fact the dish is slightly up the pole (and lower than required). Also, I used a spirit level and the pole was pretty flush, but I also suspect the weight of this dish is taking it slightly off the plumb line. My Lat is 47.1884 and my Long is -1.5325. My motor angle is 30°, and I need to deduct the declination angle (which depends on my long/lat) to determine the dish elevation. Gaaps calculator suggest for a 30° motor an antenna elevation of 22.8°, whilst Dishpointer suggest 23° (i.e. declination angle of 7°). I'm pretty convinced the dish on the motor is bang in the middle - although it's slightly tricky to make sure. It's a shame there are no alignment holes on the dish fixations and the motor pole to ensure you are bang in the middle. I pretty much had the old an new dish visually in the middle of the pole, and never got 39E, so I don't think the problem lies with my ability to get the dish bang in the middle of the motor pole. It's true I originally found true south using Astra 28, although all the other sats came in at the expected angles on the motor. However, when I re-perform alignment, I'll be sure to use 1W. For me, 1W corresponds to 0.6E and 0.8W corresponds to 0.8E. It's a shame the Foxsat HDR does not have GOTOX functionality, so I will have to manually move the motor to 0.6E when I align to 1W. This might be a bit tricky without the GOTOX function :( Just out of curiosity, the GAPPS calculator gives a change in the direction of the difference, e.g. 45W => 47.5 (diff +2.5) 30W => 31.3W (diff +1.3) 22W => 22.6W (diff +0.6) 15W => 14.9W (diff -0.1) 0.8W=> 0.8E (diff - 1.0) 1W => 0.6E (diff -1.6) 7E => 9.4E (diff -2.4) 10E => 12.7E (diff -2.7) 13E => 16.1E (diff -3.1) 26E => 30.3E (diff -4.3) 39E => 44.3E (diff -5.3) I remember seeing some info on the net that suggested you simply compensate "constantly" by you Long value, e.g. in my case 1.5325W, 13E would be 16.5325, 1W would be 0.5325E etc. (a constant diff of -1.5325), but I suspect this information to be wrong, and believe the GAAPS calculator more. Do you gurus agree with the GAAP calculator, and how the difference between motor angle and different satellite angles actually varies (i.e. gets bigger toward either E or W extreme like with the values above) ? For now, the dish install is on the chimney furthest away from the trees, as follows E S _____________________ Trees ______________________ ______ ! ! ! ! !______!----- Dish So you see, this is why I have it up the pole (to not touch chimney) I will change to the following, so that I can put the motor between the two arms of the bracket. Dish ! _______! ! ! ! ! !_______! Before I make any movements, I'll post you up the photos to give me your opinions on the trees. There is a minute chance the trees are the problem, but my gut feeling from what you all tell me, is that the pole not 100% flush, plus dish up pole (not between two arms, above 2nd arm) is distorting me from the arc on the high Easts. As a test, I'll also see if I can get 31.5W -- I'm pretty sure I will as I can get 30W. Cheers, Rob [/QUOTE]
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DISH SETUP: Single sat, Multi-Sat & Motorised
Problems with motorized 68 cm Penta on some East satellites
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