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Satellite PC Card Receivers, Internet by Satellite
TBS 6925 PCi Card with hardware blind scan in DVB-S2 and DVB-S
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<blockquote data-quote="Vipersan" data-source="post: 761341" data-attributes="member: 325666"><p>Ok ..here goes ..</p><p>Since I'm using a smaller dish ..the TD88 ....this effectively makes beam width wider ...</p><p>The dish is therefore more prone to co channel reception ..</p><p>I also believe that since both signals travel roughly the same distance ....and both birds effectively are received at an oblique angle relative to my location ..the beams are effectively elongated ...effectively making the illumination footprint oval ..</p><p>This again makes a small dish likely to get fragments of co channel regardless of which sat I'm directly pointing at ..</p><p>Thus the dish picks up both sats at the same time ...</p><p>Ordinarily this wouldn't be a problem if I was the intended target ...or If I used a bigger dish with a narrower beamwidth ..</p><p>But ...I'm not..</p><p>To make the situation worse ..</p><p>both transponders are using the same frequency and SR ...</p><p>The difference being one is S the other S2 ...and the FECs are different ...but very similar ..</p><p>I believe that the process of blind scanning ..which steps through all variants of fec ..is causing the received dual signal (one dominant ..the other not) ..to confuse the TBS tuner ..</p><p>This of course doesn't happen when all variables are specified during a forced scan ...and thus the tuner can't get confused ...</p><p>Result ..the transponders scan perfectly ....just not if blind-scanned ..</p><p>Anyone think this is plausible ?</p><p>rgds</p><p>VS</p></blockquote><p></p>
[QUOTE="Vipersan, post: 761341, member: 325666"] Ok ..here goes .. Since I'm using a smaller dish ..the TD88 ....this effectively makes beam width wider ... The dish is therefore more prone to co channel reception .. I also believe that since both signals travel roughly the same distance ....and both birds effectively are received at an oblique angle relative to my location ..the beams are effectively elongated ...effectively making the illumination footprint oval .. This again makes a small dish likely to get fragments of co channel regardless of which sat I'm directly pointing at .. Thus the dish picks up both sats at the same time ... Ordinarily this wouldn't be a problem if I was the intended target ...or If I used a bigger dish with a narrower beamwidth .. But ...I'm not.. To make the situation worse .. both transponders are using the same frequency and SR ... The difference being one is S the other S2 ...and the FECs are different ...but very similar .. I believe that the process of blind scanning ..which steps through all variants of fec ..is causing the received dual signal (one dominant ..the other not) ..to confuse the TBS tuner .. This of course doesn't happen when all variables are specified during a forced scan ...and thus the tuner can't get confused ... Result ..the transponders scan perfectly ....just not if blind-scanned .. Anyone think this is plausible ? rgds VS [/QUOTE]
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Satellite PC Card Receivers, Internet by Satellite
TBS 6925 PCi Card with hardware blind scan in DVB-S2 and DVB-S
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