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DirecTV had Technical Difficulties (On 5/23/2007)...

Discussion in 'DIRECTV General Discussion' started by TheMerk, May 23, 2007.

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  1. msmith

    msmith Icon

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    Would this explain extreme pixellation on HDNet about 6:45 EDT on Thursday?

    We had a recording of Northern Exposure that had extreme video pixellation from about 6:45 until the end 15 minutes later. The audio was fine.
     
  2. mhayes70

    mhayes70 New Member

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    Thanks for the info Tom!!
     
  3. Diana C

    Diana C Hall Of Fame DBSTalk Club

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    Most of the coordination problems are in making sure that the telemetry control and uplink signals don't step on each other. The Clarke Belt (where the geosynchronous satellites live) is about 22,300 miles up. Add the radius of the earth, and the Clarke Belt has a radius of about 26,000 miles. That means that the circumference is 160,000 miles. Even satellites that are only 0.1° apart are still separated by 45 miles of space. The tricky part is when you move them - the normal technique is to raise of lower their orbits slightly (depending on which way you want to go) so that they are no longer geosynchronous. Then they pass above or below the other satellites.
     
  4. Radio Enginerd

    Radio Enginerd New Member

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    I hear you brother! I used to drive that bad boy daily!
     
  5. Tom Robertson

    Tom Robertson Lifetime Achiever DBSTalk Club

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    I don't think the timing is correct to explain the HDnet pixelation. Wrong day.

    Cheers,
    Tom
     
  6. bwaldron

    bwaldron Impossible Dreamer

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    And wrong channel - Northern Exposure is on Universal HD :)
     
  7. jimmyv2000

    jimmyv2000 Hall Of Fame

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    Maybe CAPTAIN MIDNIGHT is making a comeback.:D
     
  8. DBordello

    DBordello Legend

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    Tom,

    I figure this is something you might know, if not point me in the right direction.

    At each of the Ku positions do you know how many transponders DirecTV is licensed for verses how many they have the capability to transmit spread over how many satellites? This would give us a good idea what kind of redundancy they have if they lose a transponder or a complete satellite.

    Obviously Ka is a little more complicated since a transponder can vary in size.

    IF you REALLY want to satisfy my curiosity you can even through in what echostar has licensed at the 101/110/119 positions.
     
  9. Tom Robertson

    Tom Robertson Lifetime Achiever DBSTalk Club

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    Alas, some of the information you and I would like to see is very hard to find. When I did my Ka satellite thread: http://www.dbstalk.com/showthread.php?t=82295, I thought I had found most of the information we could see. Now two months later, two people have found a factsheet on Boeing's site that give many more details about D10, D11, D12.

    What I can say is that the chart at dbsforums.com: http://www.dbsforums.com/compare/chart_main.html is accurrate for DIRECTVs licenses. What I don't have a handle on is how many spare transponders are up in each location either via spare satellites or as spares on the satellites.

    And some of the satellites predate the internet era, data just isn't as accessible as we'd like. :(

    To track all this down, the FCC International Bureau is one of the better sources: http://svartifoss2.fcc.gov/myibfs/welcome.do

    Happy Hunting,
    Tom
     
  10. veryoldschool

    veryoldschool Lifetime Achiever Staff Member Super Moderator DBSTalk Club

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    When I worked at Loral Space Systems, there were more "backups" than you'd think [at first] for the transponders. One would need to breakdown a "transponder" to: input TWT, the repeater module, & output TWT. For the repeater there aren't as many [maybe 1 for 10], but I think every TWT had a backup. The heaters for them are used to maintain the SAT temp. Almost everything in the RF path can be reconfigured through a myriad of switches.
    TWT= Traveling Wave Tube [High gain amplifiers].
    Not all of the answer, but they do pack a lot of backup into them before launch as the service call "is a killer".
     
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