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DISH SETUP: Single sat, Multi-Sat & Motorised
signal strength v quality
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<blockquote data-quote="FRAZER" data-source="post: 14843" data-attributes="member: 175135"><p>Thanks to the big hitters for such a speedy response, which has spurred me on to some more methodical research.</p><p></p><p>I have found that, whilst the maximum signal strength readings are pretty much the same across all satellites, at around 50% (which doesn't seem particularly high), the optimum signal quality varies from around 70% on some of the major european satellites (Sky, Astra, Hotbird), down to 30-40% on others, which means some of the weaker signals don't get through at all. Particularly bad are 7 East, 12.5 West and 15 West.</p><p></p><p>I have tried to find the strongest signal on each satellite for each polarization, which seems to mean one with a high symbol rate. Having said that, though, there is a particularly stubborn feed on 12.5 West I have never been able to pick up at all, even though there is another with a far lower symbol rate (3,260, as opposed to 20,150), on the same polarization which I just about can. Is there no rule to this, or is that likely to be a case of noise at certain parts of the spectrum as Old Satellite suggested? </p><p></p><p>Anyway, I also noticed that moving the dish slightly affected the quality readings, but not necessarily the strength. Is this likely to be due to the inaccuracy of these meter readings, or is signal strength actually less sensitve to correct alignment than signal quality? If this is true, does this apply to obstructions as well, which would seem on the face of it counter-intuitive- why should only noise be affected by an obstruction and not strength? </p><p></p><p>But if this is indeed true, it might suggest that the problem does lie with the (now completely bare) tree in front of my dish, which has already taken some pruning, and which I would happily cut down were it not a rented house! The fact that Sirius is weaker than I would expect, and this lies close to 7 east, as 12.5 and 15 west are close to each other too, may suggest that there are clusters of branches getting in the way. But this is not immediately obvious to the eye, and when I hung on a suspicious branch earlier on, it made no difference at all! So I would like to be sure this is a prime suspect before risking any more pruning.</p><p></p><p>Thanks again for the help,</p><p></p><p>Frazer</p></blockquote><p></p>
[QUOTE="FRAZER, post: 14843, member: 175135"] Thanks to the big hitters for such a speedy response, which has spurred me on to some more methodical research. I have found that, whilst the maximum signal strength readings are pretty much the same across all satellites, at around 50% (which doesn't seem particularly high), the optimum signal quality varies from around 70% on some of the major european satellites (Sky, Astra, Hotbird), down to 30-40% on others, which means some of the weaker signals don't get through at all. Particularly bad are 7 East, 12.5 West and 15 West. I have tried to find the strongest signal on each satellite for each polarization, which seems to mean one with a high symbol rate. Having said that, though, there is a particularly stubborn feed on 12.5 West I have never been able to pick up at all, even though there is another with a far lower symbol rate (3,260, as opposed to 20,150), on the same polarization which I just about can. Is there no rule to this, or is that likely to be a case of noise at certain parts of the spectrum as Old Satellite suggested? Anyway, I also noticed that moving the dish slightly affected the quality readings, but not necessarily the strength. Is this likely to be due to the inaccuracy of these meter readings, or is signal strength actually less sensitve to correct alignment than signal quality? If this is true, does this apply to obstructions as well, which would seem on the face of it counter-intuitive- why should only noise be affected by an obstruction and not strength? But if this is indeed true, it might suggest that the problem does lie with the (now completely bare) tree in front of my dish, which has already taken some pruning, and which I would happily cut down were it not a rented house! The fact that Sirius is weaker than I would expect, and this lies close to 7 east, as 12.5 and 15 west are close to each other too, may suggest that there are clusters of branches getting in the way. But this is not immediately obvious to the eye, and when I hung on a suspicious branch earlier on, it made no difference at all! So I would like to be sure this is a prime suspect before risking any more pruning. Thanks again for the help, Frazer [/QUOTE]
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DISH SETUP: Single sat, Multi-Sat & Motorised
signal strength v quality
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