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Sky Digital BSkyB, Freesat & Saorsat support forum
Sky & Freesat fringe reception
Which is best 1.8M dish in Spain - Offset or PF ?
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<blockquote data-quote="joddle" data-source="post: 881376" data-attributes="member: 247983"><p>I think you are asking a question which has no real answer - each type of dish has advantages and disadvantages and for mounting on a roof I think the physical aspects could be more important than anythng else. Weight and wind tolerance being critical.</p><p> </p><p>Quality for quality, there is little to choose on performance between a good PF and good Offset dish assuming they are set up right with a good LNBs and feedhorns. In theory the offset should be very slightly better as there will be no LNB shadow whereas on a PF dish that's unavoidable - but on these larger dishes, the shadow has an insignificant effect.</p><p> </p><p>Worth noting is a PF dish will be set at more of an angle than an offset so if the wind comes from behind it is more likely to recceive a lifting force from strong winds which may be an issue on some roofs! To counter that an offset dish will be more upright so may gather more wind as well as having much longer and lower LNB arms which may intrude into other space or be vunerable - it all a matter of what is best in your particular situation. With either type you need the dish as close to the deck as possible to avoid wind damage problems. With either type, mounting on a roof requires a really good base - my own dish has its stand set into a large concrete block cast on the roof - (checking the structure is srong enough is a must - don't do it without proper advice - your insurance may be affected!</p><p> </p><p>As for LNBs - for the PF dish use an Invacom C120 with the correct feedhorn made for the dish - for an offset there are quite a few choices of good LNB - go for the best you can afford. Cheap ones won't get the best from your dish.</p></blockquote><p></p>
[QUOTE="joddle, post: 881376, member: 247983"] I think you are asking a question which has no real answer - each type of dish has advantages and disadvantages and for mounting on a roof I think the physical aspects could be more important than anythng else. Weight and wind tolerance being critical. Quality for quality, there is little to choose on performance between a good PF and good Offset dish assuming they are set up right with a good LNBs and feedhorns. In theory the offset should be very slightly better as there will be no LNB shadow whereas on a PF dish that's unavoidable - but on these larger dishes, the shadow has an insignificant effect. Worth noting is a PF dish will be set at more of an angle than an offset so if the wind comes from behind it is more likely to recceive a lifting force from strong winds which may be an issue on some roofs! To counter that an offset dish will be more upright so may gather more wind as well as having much longer and lower LNB arms which may intrude into other space or be vunerable - it all a matter of what is best in your particular situation. With either type you need the dish as close to the deck as possible to avoid wind damage problems. With either type, mounting on a roof requires a really good base - my own dish has its stand set into a large concrete block cast on the roof - (checking the structure is srong enough is a must - don't do it without proper advice - your insurance may be affected! As for LNBs - for the PF dish use an Invacom C120 with the correct feedhorn made for the dish - for an offset there are quite a few choices of good LNB - go for the best you can afford. Cheap ones won't get the best from your dish. [/QUOTE]
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Sky Digital BSkyB, Freesat & Saorsat support forum
Sky & Freesat fringe reception
Which is best 1.8M dish in Spain - Offset or PF ?
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