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DISH SETUP: Single sat, Multi-Sat & Motorised
what to expect from an old girl..?
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<blockquote data-quote="Vipersan" data-source="post: 806989" data-attributes="member: 325666"><p>..Well ...did some more experimenting last night....and had a power cut for the entire area which didn't do my project or indeed ..my pcs nor my server any favours ..</p><p>All sorted now thank gawd..</p><p>This experiment involved hanging a 2nd C band lnb to the other side of the one at the focus ..</p><p>Roughly same distance from the dish centre ...pointing directly AT the centre ..and seperated again by roughly 5 degrees as is the ku..</p><p>After much tweaking and elevation adjusted ..and using 5W as the target...</p><p>Chosen because using circular polarisation removes any skew errors that might occur..</p><p>..only half the signal level I can obtain at the focus was possible ..</p><p>Yes it works ..but very inefficiently...</p><p>I can only conclude from this that PF dishes do not readily lend themselves to offset lnbs ...and certainly not C band..</p><p>This may go a long way to explain why the ku offset lnb ..though working cannot output greater signal levels on a 2m pf than at the focus of a TD110..</p><p>I guess it is too big an ask ..</p><p>What might be possible is to aim off centre with the ku at 2 or 3 petals of the dish ...</p><p>effectively using only part of the dish surface as an offset dish ..</p><p>..though this would require completely changing the look angle (declining the dish considerably ...to behave just like an offset...</p><p>I doubt its worth the difficulty in finding where to place the lnb ...or indeed creating a greater declination of the PF..</p><p>Certainly this would be pointless from a Cband perspective as 2 or 3 panels would barely bring in the stronger sats.</p><p>So ..I guess I'll just make do and accept the ku offset working below par much like the performance of a dish somewhere between a TD88 ..and a TD110..</p><p>One day I may just pop the Hybrid black Ultra at the focus ...just to see _what_ ku levels can be achieved.</p><p>rgds</p><p>VS</p></blockquote><p></p>
[QUOTE="Vipersan, post: 806989, member: 325666"] ..Well ...did some more experimenting last night....and had a power cut for the entire area which didn't do my project or indeed ..my pcs nor my server any favours .. All sorted now thank gawd.. This experiment involved hanging a 2nd C band lnb to the other side of the one at the focus .. Roughly same distance from the dish centre ...pointing directly AT the centre ..and seperated again by roughly 5 degrees as is the ku.. After much tweaking and elevation adjusted ..and using 5W as the target... Chosen because using circular polarisation removes any skew errors that might occur.. ..only half the signal level I can obtain at the focus was possible .. Yes it works ..but very inefficiently... I can only conclude from this that PF dishes do not readily lend themselves to offset lnbs ...and certainly not C band.. This may go a long way to explain why the ku offset lnb ..though working cannot output greater signal levels on a 2m pf than at the focus of a TD110.. I guess it is too big an ask .. What might be possible is to aim off centre with the ku at 2 or 3 petals of the dish ... effectively using only part of the dish surface as an offset dish .. ..though this would require completely changing the look angle (declining the dish considerably ...to behave just like an offset... I doubt its worth the difficulty in finding where to place the lnb ...or indeed creating a greater declination of the PF.. Certainly this would be pointless from a Cband perspective as 2 or 3 panels would barely bring in the stronger sats. So ..I guess I'll just make do and accept the ku offset working below par much like the performance of a dish somewhere between a TD88 ..and a TD110.. One day I may just pop the Hybrid black Ultra at the focus ...just to see _what_ ku levels can be achieved. rgds VS [/QUOTE]
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DISH SETUP: Single sat, Multi-Sat & Motorised
what to expect from an old girl..?
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