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<blockquote data-quote="moonbase" data-source="post: 1081498" data-attributes="member: 178786"><p>The digital inclinometer you have shows 59.1 degrees when it is on one of the vertical struts of the square frame that the dish is secured to. This is good as it is almost spot on. There is no need to compensate for the 0.3 degrees you are talking about, be guided only by the degrees displayed by the digital inclinometer when it is on the vertical strut of the square frame that the dish is bolted to.</p><p></p><p>In a previous discussion the expert told you that the square part of the LNB needed to be level with the ground, now he is saying it does not need to be? In my opinion the LNB needs to be orientated so that the left to right plane of the square part is level with the ground and that the front to back plane of the square plate is parallel with the skyward point angle of the dish, ie, the LNB opening is pointing directly at the centre of the dish.</p><p></p><p>The orientation of the LNB is important, the polarity of C-Band signals from 68.5 East is linear and the probes need to be correctly aligned. If the polarity of the signals was circular and you were using a dielectric plate then the orientation of the LNB is not important. However, in your case for 68.5 East the LNB needs to be correctly orientated with each of the probes at 45 degrees to horizontal/vertical.</p><p></p><p>Next we come to focal length, I am not sure what the numbers on the piece of paper mean, there are several different numbers for focal length. Forget about contributions from thickness of scalars etc, just find out the true focal length of the dish and then locate the LNB in the central clamping unit so that the LNB opening is at a distance of [Dish Focal Length] minus [6 millimetres] when measured from the LNB opening to the centre of the dish.</p><p></p><p>These settings will be a good starting point for scanning. Forget the meter, connect the dish up to a receiver and run a blind scan for 3400 MHz to 4200 MHz and see what you get. If you get nothing, rotate the entire assembly a fraction on the pole and repeat the blind scan. You might have to rotate the entire assembly in both directions before you get a signal locked in the receiver.</p><p></p><p>As indicated by previous contributors to this topic, make some marks on your starting point before rotating the entire assembly so you can always return to it.</p><p></p><p>Lastly, if you have a short run of good cable, connect up a TV and the receiver close to the dish before commencing proceedings.</p></blockquote><p></p>
[QUOTE="moonbase, post: 1081498, member: 178786"] The digital inclinometer you have shows 59.1 degrees when it is on one of the vertical struts of the square frame that the dish is secured to. This is good as it is almost spot on. There is no need to compensate for the 0.3 degrees you are talking about, be guided only by the degrees displayed by the digital inclinometer when it is on the vertical strut of the square frame that the dish is bolted to. In a previous discussion the expert told you that the square part of the LNB needed to be level with the ground, now he is saying it does not need to be? In my opinion the LNB needs to be orientated so that the left to right plane of the square part is level with the ground and that the front to back plane of the square plate is parallel with the skyward point angle of the dish, ie, the LNB opening is pointing directly at the centre of the dish. The orientation of the LNB is important, the polarity of C-Band signals from 68.5 East is linear and the probes need to be correctly aligned. If the polarity of the signals was circular and you were using a dielectric plate then the orientation of the LNB is not important. However, in your case for 68.5 East the LNB needs to be correctly orientated with each of the probes at 45 degrees to horizontal/vertical. Next we come to focal length, I am not sure what the numbers on the piece of paper mean, there are several different numbers for focal length. Forget about contributions from thickness of scalars etc, just find out the true focal length of the dish and then locate the LNB in the central clamping unit so that the LNB opening is at a distance of [Dish Focal Length] minus [6 millimetres] when measured from the LNB opening to the centre of the dish. These settings will be a good starting point for scanning. Forget the meter, connect the dish up to a receiver and run a blind scan for 3400 MHz to 4200 MHz and see what you get. If you get nothing, rotate the entire assembly a fraction on the pole and repeat the blind scan. You might have to rotate the entire assembly in both directions before you get a signal locked in the receiver. As indicated by previous contributors to this topic, make some marks on your starting point before rotating the entire assembly so you can always return to it. Lastly, if you have a short run of good cable, connect up a TV and the receiver close to the dish before commencing proceedings. [/QUOTE]
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