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Sky Digital BSkyB, Freesat & Saorsat support forum
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Freesat & FS-4200
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<blockquote data-quote="eclts" data-source="post: 602369" data-attributes="member: 320170"><p>Hi,</p><p></p><p>Thanks for the reply. </p><p></p><p>I have checked the skew (I apologise, I should have said that in the</p><p>original posting). The LNB is more or less in the position indicated in</p><p>the photograph - the mid-line is pointing between 4 and 5 o'clock. There</p><p>is, as I guess you know, a set of markings or gradations on the LNB: I</p><p>started with the central (teardrop shaped) one vertical (as advised by</p><p>Forte) and varied the skew position around that point.</p><p></p><p>I know I'm very close to 32.7 degrees east of magnetic south - although I</p><p>do not know how close I *have* to be. I've got a pretty good compass, and</p><p>there are plenty of other dishes around me. </p><p></p><p>As far as the vertical position is concerned I'm assuming the correct</p><p>elevation is 22.5 degrees: I have the plane of the dish 22.5 degrees from</p><p>the vertical (rather than the arm 22.5 from the horizontal - the plane of</p><p>the face of dish is not at rightangles to the arm: all I have done is lay</p><p>a piece of wood across the face of the face, cut a piece of cardboard to</p><p>22.5 degrees, laid it against the wood and checked with a spirit level</p><p>that it is vertical). It has to be very close. I have telephoned Forte,</p><p>and they indicated that the dish should be 32-34 degrees from the</p><p>vertical, which I cannot understand, but I tried it anyway without any</p><p>success.</p><p></p><p>** Amended 28/04/2009: Now I did not realise this was an offset dish... </p><p>there was no documentation to that effect in my Maplin pack. I should </p><p>have thought about it of course but I did not. Thanks to the mail below!! </p><p>I have since looked up on-line and, as far as I can determine it is offset by </p><p>24.62 degrees so (where I am) it should point a couple of degrees down </p><p>when viewed from the side. I'll certainly try this and update the thread.</p><p></p><p>I have line-of-sight. </p><p></p><p>I have stepped the dish around and the the readings on the</p><p>receiver never vary - intensity 45%, quality 4/5%. The satellite finder</p><p>indicates some variation but remains in a fairly narrow band (3-4 on a 10</p><p>point db scale) until - and this I cannot comprehend - I put my hand between</p><p>the LNB and the dish when it goes up to 7-8. </p><p></p><p>I do not know how long a time a change in position would take to be</p><p>reflected in the reading on the receiver, I have tended to give it 10-15</p><p>seconds. The satellite finder appears to reflect what small changes there</p><p>are in real time.</p><p></p><p>One final curiosity. I noticed that the meter was powered only when the</p><p>receiver was set to H or Auto (polarisation?) in the antenna setup menu</p><p>(at least when the Satellite selected was Astra 2). If I select V, the</p><p>lights go out on the finder, so I assume there is no voltage in that case. </p><p></p><p>Most of my attempts have used the factory settings.</p><p></p><p>Any help appreciated</p></blockquote><p></p>
[QUOTE="eclts, post: 602369, member: 320170"] Hi, Thanks for the reply. I have checked the skew (I apologise, I should have said that in the original posting). The LNB is more or less in the position indicated in the photograph - the mid-line is pointing between 4 and 5 o'clock. There is, as I guess you know, a set of markings or gradations on the LNB: I started with the central (teardrop shaped) one vertical (as advised by Forte) and varied the skew position around that point. I know I'm very close to 32.7 degrees east of magnetic south - although I do not know how close I *have* to be. I've got a pretty good compass, and there are plenty of other dishes around me. As far as the vertical position is concerned I'm assuming the correct elevation is 22.5 degrees: I have the plane of the dish 22.5 degrees from the vertical (rather than the arm 22.5 from the horizontal - the plane of the face of dish is not at rightangles to the arm: all I have done is lay a piece of wood across the face of the face, cut a piece of cardboard to 22.5 degrees, laid it against the wood and checked with a spirit level that it is vertical). It has to be very close. I have telephoned Forte, and they indicated that the dish should be 32-34 degrees from the vertical, which I cannot understand, but I tried it anyway without any success. ** Amended 28/04/2009: Now I did not realise this was an offset dish... there was no documentation to that effect in my Maplin pack. I should have thought about it of course but I did not. Thanks to the mail below!! I have since looked up on-line and, as far as I can determine it is offset by 24.62 degrees so (where I am) it should point a couple of degrees down when viewed from the side. I'll certainly try this and update the thread. I have line-of-sight. I have stepped the dish around and the the readings on the receiver never vary - intensity 45%, quality 4/5%. The satellite finder indicates some variation but remains in a fairly narrow band (3-4 on a 10 point db scale) until - and this I cannot comprehend - I put my hand between the LNB and the dish when it goes up to 7-8. I do not know how long a time a change in position would take to be reflected in the reading on the receiver, I have tended to give it 10-15 seconds. The satellite finder appears to reflect what small changes there are in real time. One final curiosity. I noticed that the meter was powered only when the receiver was set to H or Auto (polarisation?) in the antenna setup menu (at least when the Satellite selected was Astra 2). If I select V, the lights go out on the finder, so I assume there is no voltage in that case. Most of my attempts have used the factory settings. Any help appreciated [/QUOTE]
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