Interactive Beam Footprint Library

Discussion in 'DIRECTV Tips and Resources' started by Gary Toma, Jun 17, 2011.

  1. May 6, 2015 #121 of 194
    slice1900

    slice1900 Well-Known Member

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    I don't see any reason why Directv would have to use that language here just because they did with D15. Just like some requests to move satellites around leave out the Spaceways because they didn't have to move

    Either way Directv has to get a LOA to use a certain frequency band from a certain slot. Since they'll want to be able to test that payload they can't keep it a secret, they'd have to tell the FCC what they plan to test and choose a slot where they'd be allowed to test FSS to CONUS.
     
  2. studechip

    studechip Godfather

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    Why isn't Hartford CT included in any of the spotbeam maps?
     
  3. HoTat2

    HoTat2 Hall Of Fame

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    The cities listed for the spotbeams refer to a beam's geometric center or boresight axis as filed with the FCC. Not all the DMAs covered by the entire footprint of the beam.

    The Hartford, Conn. local market is served by the Boston spotbeam A3B1 from D12 at 103W.

    Consult with Tom's Physical Transponder Maps for a detailed listing of the actual DMAs covered by the satellites' spotbeams, and not just the cities aimed at by the beam's boresight.
    http://dbstalk.com/index.php?/topic/218308-Physical-Transponder-Maps-with--TPN-/-TID-Reference

    Sent from my SGH-M819N using Tapatalk
     
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  4. slice1900

    slice1900 Well-Known Member

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    The other shortcoming of the spotbeam map I didn't realize until it was explained to me recently is that although the satellites can broadcast more than one transponder to the same location, the map only shows each once. In a situation like Hartford's where it is using the Boston beam, the spot beam map will show it once, but there may be three beams each of which could be used for a different DMA, even though they're all centered on the same city.

    It is pretty complicated and the lengthy research tomspeer46 did to gather all the information in his spreadsheets really helps out a lot with being able to make sense out of it all.
     
  5. tomspeer46

    tomspeer46 Legend

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    Actually, calling D12's A3B1 beam "Boston" is a bit of a misnomer, probably created by someone on the West Coast who thinks there are only three cities in the Northeast.
    The beam's center is halfway between Brattleboro, VT and Manchester, NH. It serves primarily the Hartford CT, DMA on TID 150 (TPN 17), and the Albany, NY DMA on TID 161 (TPN 18). Albany is my DMA, and I am on the far western edge of the usable portion of the beam. There is also one channel for NYC. and one for Providence, RI on TID 150, using the same beam.
     
  6. Gary Toma

    Gary Toma UNIX

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    Beam RB-1 and RB-2
    A clarification from Tom Speer:

    In reviewing the FCC data for the BSS packages, RB-1 and RB-2, I notice that you have updated the beam footprint library to include Puerto Rico for beam DL1 on both satellites from the latest FCC data. (Note that both FCC database files refer to that as DL1, not DL-A). But the other beam footprints you have in the Beam Footprint Library for RB-1 on D14 and RB-2 on D15 are no longer valid.

    In the original 2006 filings (SAT-LOA-20060908-00099 and SAT-LOA-20060908-00100), both satellites had beams DL2 and DL3 for Mexico and South America. In the modifications filed in 2008 (SAT-AMD-20080114-00013 and SAT-AMD-20080114-00014) and later in 2011 (SAT-MOD-20110727-00135 and SAT-MOD-20110727-00136), the only downlink beam in their database is DL1. Between the original LOA in 2006,and the redesign in 2008, they went from 24 downlink frequencies to 18, and changed their center frequencies, and eliminated all but the CONUS+ beam.
     
  7. inkahauts

    inkahauts Well-Known Member

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    Gary did they go with wider bandwidth beams since they changed the center freq?
     
  8. tomspeer46

    tomspeer46 Legend

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    No they did not. They are still 36Mhz wide channels, spaced 40 Mhz apart. in the redesign in 2008, they just lowered the center frequencies by 4 Mhz, and went from 24 transponders to 18. The downlinks are 40 Mhz apart, starting at 17326 Mhz. That design was repeated in the 2011 filing, where they modified beam DL1 to include PR. In my message to Gary, which he quoted above, I should have stated that the DL2 and DL3 beams are no longer valid. The CONUS+ beams include PR, so I assume were taken from the 2011 Schedule S data.
     
  9. tomspeer46

    tomspeer46 Legend

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    My apologies to those who tried to follow the links in the above posts. They only take you to the FCC's MyIFBS home page. To see the filings, ignore the login, and enter S2711 for RB-1 or S2712 for RB-2 into the callsign field of the quick search. From the list of al filings for each satellite, select the ones that I quoted, if you are interested.
     
  10. slice1900

    slice1900 Well-Known Member

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    I believe originally they were planning to use RDBS in the LA market as well as the US. In the US they can only use 400 MHz, the last 100 MHz is reserved (by the DoD or something like that) That's why it used to have 24 transponders and they dropped it to 18. When they had 24 they had an option to use transponders 19 & 20 in the US, but those would have been only 24 MHz wide to stay within the US limits. By the time they modified things in 2011 they'd probably figured out 3D was going nowhere and they'd use it 4K, and wouldn't need the extra 24 MHz transponders.
     
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  11. HoTat2

    HoTat2 Hall Of Fame

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    Hey Gary, why did I get ignored when I posted about this last year? :mad:
    http://www.dbstalk.com/topic/184044-interactive-beam-footprint-library-update-6222015/?p=3272381

    Just kidding of course ... :)

    Anyway, as noted in that post you can see there is even a more recent 2014 filing for S2712 on D15 where RB-2 will actually have three beams. One main CONUS+ beam and two spot mirrors for PR and HI.

    I just don't understand why there was never such a filing for D14's R-band payload S2711 (RB-1) to have three beams like that as well. I see no reason why RB-1's downlink beams should not be designed the same way.
     
  12. slice1900

    slice1900 Well-Known Member

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    It is reasonable to assume both are designed the same way for RDBS as they are for Ka. Between all the filings changing things over the years for RDBS and the occasional filing inaccuracies, they probably just missed it.
     
  13. slice1900

    slice1900 Well-Known Member

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    This brings up something else I'm wondering about. We've discussed the possibility (or likelihood, IMHO) of Directv mirroring the contents of 95 and 119 using either Ka or RDBS. I wonder if they will do the same for 101 - for channels that remain SD only after they go "all HD". I'm sure Hawaii residents would like to dump the big dish and use a Slimline; 101 is the main reason they can't.
     
  14. inkahauts

    inkahauts Well-Known Member

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    Not sure what y are suggesting... They can't throw everything off of 101 just because of hi and give up their 101 bandwidth for it. That would be silly. I wonder, maybe we have been discussing all this stuff about using the space ways for pr if they aren't also going to be able to use a lot of their abilities for hi as well maybe.
     
  15. slice1900

    slice1900 Well-Known Member

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    No, you misunderstand. I'm just talking about the small number of channels that are ONLY on 101. Creating an MPEG4 SD duplicate of those channels on 99/103 so 101 becomes effectively only used by MPEG2 SD customers until MPEG2 is retired someday.
     
  16. inkahauts

    inkahauts Well-Known Member

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    Interesting thought. Still though what happens when. They repurpose 101 for something new when moeg2 shuts off and hi people need it again?
     
  17. slice1900

    slice1900 Well-Known Member

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    By that time they'll have launched a new satellite for 101 that includes a Hawaii beam like D10-D15 do :)
     
  18. inkahauts

    inkahauts Well-Known Member

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    Could be. To bad they can't use the sapceways to do that for hi instead. Itll be interesting to see what they prioritize. I still Think that 96 is going to be duplicated first. Then 119. But I also think they won't do that until after they light up the HD that they want to.
     
  19. HoTat2

    HoTat2 Hall Of Fame

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    Wonder if they would do something like that though if it were only a half-way benefit to subscribers since I think Alaska would still be stuck with the 1.2m (or sometimes 1.8m) ODU?

    The reason being, though I'm sure the newer Ka band satellites from D10 onward have their "CONUS+" beams better contoured to cover Alaska on the beam edges than the earlier Ku band satellites, the greater attenuation of the Ka band frequencies could negate a lot of that to where the signal strength probably isn't much better than from the Ku band birds.

    IOW, the larger ODU is needed to receive both Ka and Ku band nationals in Alaska.
     
  20. slice1900

    slice1900 Well-Known Member

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    Well certainly in northern or western areas of Alaska. Anchorage would probably be OK. It really isn't as big of a consideration for Alaska. The reason I think it would matter more in Hawaii is because people there are spending a LOT of money on a house, generally on a pretty small lot, and would likely prefer the dish be as discreet as possible.
     

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