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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="Huevos" data-source="post: 759427" data-attributes="member: 301161"><p>As a general rule of thumb, a safe bandwidth so one transponder doesn't interfere with the next transponder of the same polarization is 1.35x SR[*]. That means if you want to scan for transponders with an SR of 1.000 Mbps, you need to scan in steps no bigger than 1.350 Mbps, otherwise you will miss some low SR transponders. It doesn't mean that the same scan will miss every low SR transponder though because if your 5MHz step scan coincides with the low SR signal frequency it will find the transponder. So in theory a 5MHz step should easily find all signals down to 5.000 Mbps SR.</p><p></p><p>* examples</p><ul> <li data-xf-list-type="ul">Astra 2D is 29.5 Mhz between Tx's for 22.000 SR = 1.35x SR</li> <li data-xf-list-type="ul">Astra 2A is 39.0 Mhz between Tx's for 27.500 SR = 1.41x SR</li> <li data-xf-list-type="ul">Hotbird is 39.0 Mhz between Tx's for 27.500 SR = 1.41x SR</li> <li data-xf-list-type="ul">Thor 6 is 31.0 Mhz between Tx's for 25.000 SR = 1.24x SR</li> <li data-xf-list-type="ul">Nilesat 201 is 38.0 Mhz between Tx's for 27.500 SR = 1.38x SR</li> </ul><p>Obviously it is harder to see the relationship when SR and step are different for each and every transponder as is often the case in C-band, or where the band isn't tightly packed with transponders.</p><p></p><p>By the way is Canal Info News still there? I can't see it anymore even on the spectrum.</p></blockquote><p></p>
[QUOTE="Huevos, post: 759427, member: 301161"] As a general rule of thumb, a safe bandwidth so one transponder doesn't interfere with the next transponder of the same polarization is 1.35x SR[*]. That means if you want to scan for transponders with an SR of 1.000 Mbps, you need to scan in steps no bigger than 1.350 Mbps, otherwise you will miss some low SR transponders. It doesn't mean that the same scan will miss every low SR transponder though because if your 5MHz step scan coincides with the low SR signal frequency it will find the transponder. So in theory a 5MHz step should easily find all signals down to 5.000 Mbps SR. * examples [LIST] [*]Astra 2D is 29.5 Mhz between Tx's for 22.000 SR = 1.35x SR [*]Astra 2A is 39.0 Mhz between Tx's for 27.500 SR = 1.41x SR [*]Hotbird is 39.0 Mhz between Tx's for 27.500 SR = 1.41x SR [*]Thor 6 is 31.0 Mhz between Tx's for 25.000 SR = 1.24x SR [*]Nilesat 201 is 38.0 Mhz between Tx's for 27.500 SR = 1.38x SR [/LIST] Obviously it is harder to see the relationship when SR and step are different for each and every transponder as is often the case in C-band, or where the band isn't tightly packed with transponders. By the way is Canal Info News still there? I can't see it anymore even on the spectrum. [/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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