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Sky Digital BSkyB, Freesat & Saorsat support forum
Sky & Freesat fringe reception
Must the dish size be an educated guess ?
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<blockquote data-quote="dxsat" data-source="post: 378960" data-attributes="member: 193607"><p>It is possible to measure the signal strength being received at any point within the theoretical footprint of Astra 2D in europe, and to convert the signal strength into a dish size projection, via a mathematical formula.(which I don't have, unfortunately. I may be able to find it)</p><p>You are quite correct in assuming that a dish will receive traces of a 2D signal, which can be measured with a good meter, but are too weak to give a picture on a digibox. Most meters require a 'lock', and without this will show you nothing, as the signal is digital. </p><p>You would have to take the 'worst case' signal and base a projection from there. You would then have a number of options: </p><p>-Only one polarity received properly.</p><p>-Partial reception, loss of one or both polarities at some times of day.</p><p>-24 hour reception of both polarities.</p><p>-24/7 reception even in rain.</p><p></p><p>The last option might require an unfeasibly large dish in some areas.</p><p>Receiver sensitivity is generally within small variations for a given make and model. For example, it's known that Pace 2600 CI give good results on weak signals, with little variation from one 2600 receiver to another</p><p>The same applies to better LNB's. Invacom is the only make I can think of. There is almost no variation between batches of the the same model.</p><p>Cable length makes very little difference to signal quality, but cable type does. A good PF100 or similar will give good results regardless.</p><p>I don't think anyone has ever done a comprehensive, accurate map of dish size outside the official footprint. There have been a few published but they are generally inaccurate.</p></blockquote><p></p>
[QUOTE="dxsat, post: 378960, member: 193607"] It is possible to measure the signal strength being received at any point within the theoretical footprint of Astra 2D in europe, and to convert the signal strength into a dish size projection, via a mathematical formula.(which I don't have, unfortunately. I may be able to find it) You are quite correct in assuming that a dish will receive traces of a 2D signal, which can be measured with a good meter, but are too weak to give a picture on a digibox. Most meters require a 'lock', and without this will show you nothing, as the signal is digital. You would have to take the 'worst case' signal and base a projection from there. You would then have a number of options: -Only one polarity received properly. -Partial reception, loss of one or both polarities at some times of day. -24 hour reception of both polarities. -24/7 reception even in rain. The last option might require an unfeasibly large dish in some areas. Receiver sensitivity is generally within small variations for a given make and model. For example, it's known that Pace 2600 CI give good results on weak signals, with little variation from one 2600 receiver to another The same applies to better LNB's. Invacom is the only make I can think of. There is almost no variation between batches of the the same model. Cable length makes very little difference to signal quality, but cable type does. A good PF100 or similar will give good results regardless. I don't think anyone has ever done a comprehensive, accurate map of dish size outside the official footprint. There have been a few published but they are generally inaccurate. [/QUOTE]
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Sky Digital BSkyB, Freesat & Saorsat support forum
Sky & Freesat fringe reception
Must the dish size be an educated guess ?
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