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SixtoReport: D12 Satellite Info in Post#1 - Live!

Discussion in 'DIRECTV General Discussion' started by Sixto, Jul 27, 2008.

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  1. Apr 26, 2010 #7321 of 10270
    LameLefty

    LameLefty I used to be a rocket scientist

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    The vibration would be transmitted through its own structure and detected by accelerometers. :)
     
  2. Apr 26, 2010 #7322 of 10270
    Carl Spock

    Carl Spock Superfly

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    ^ Nothing is grosser than smelling your own farts in space.
     
  3. Apr 26, 2010 #7323 of 10270
    evan_s

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    I see nothing to indicate that it would be any stronger than D10/D11. Even if it was it wouldn't really help the issue. The main problem is that the Ka band is at a different frequency and is more easily absorbed by moisture in the atmosphere. This results in more dramatic loss of signal compared to Ku when you have clouds/rain. You can only go so powerful before you risk interference issues with other sats. For spot beams it is possible to dynamically scale the power (the spaceway sats were originally designed with this feature but not sure if it is actually used) but for Conus signals it isn't really possible as there will always be areas ranging from no clouds to heavy clouds someplace in the coverage.
     
  4. Apr 26, 2010 #7324 of 10270
    Curtis0620

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    No, but, hopefully it is pointing in the right direction and it sends it toward 103.
     
  5. Apr 26, 2010 #7325 of 10270
    jacmyoung

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    That is proof the "move" starts as soon as the sat "farts". If the "move" has to wait till the sat "settles" into that higher circular orbit, the orbit has to be beyond the "graveyard". You do not want our sats to have the experience of being haunted, ever. They are too much of babies already.
     
  6. Apr 26, 2010 #7326 of 10270
    jacmyoung

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    But that will not be the sound of a fart, maybe some vibration detected by some meter, but not the sound of a fart:)
     
  7. Apr 26, 2010 #7327 of 10270
    Sixto

    Sixto Well-Known Member

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    This will be the first use of Ka-Hi for National.
     
  8. Apr 26, 2010 #7328 of 10270
    LameLefty

    LameLefty I used to be a rocket scientist

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    Sound is the motion of compression-rarefication waves. It can be transmitted through solids, liquids, gases and plasmas.
     
  9. Apr 26, 2010 #7329 of 10270
    evan_s

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    As was already mentioned by Tom the TWTA's are the amplifiers that increase the signal the sat receives before transmitting it back down. They are not aimed at anything but are connected to a Bent tube pipe (aka transmitting antenna) that is aimed at something through a fancy switch that allows different TWTA's to power different pipes.

    DirecTV is not actually claiming any increase in capacity for Spots from launching D12. Obviously, DirecTV will have more spots available with the 2 sats positioned up there but that doesn't mean they can actually use more of them at the same time. That depends on the exact positioning of all the spots and the frequencies available. You can re-use the same frequency multiple times but only by having spots aimed at different areas that don't overlap. And just because you don't see any signal on particular TPs doesn't mean that they wouldn't overlap somewhere else and cause a problem.

    Also, the spot beams are run a little differently and actually have more than 5 channels per tp anyway. The KA spot beams are also fairly large so are probably covering multiple markets too. The question of filling in missing locals, be it PBS or CW or other specific locals, is a very complicated one and I'm not sure anyone besides DirecTV can really tell if it is possible.
     
  10. Apr 26, 2010 #7330 of 10270
    Beerstalker

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    Put your ear up against the structure and you would hear it.

    Sound is just vibrations. Whether that vibration travels through the air (a gas), liquid, or solid it is still sound.
     
  11. Apr 26, 2010 #7331 of 10270
    curt8403

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    put a glass of water on the floor, you should see the vibrations
    :sure: Dr. Who
     
  12. Apr 26, 2010 #7332 of 10270
    James Long

    James Long Ready for Uplink! Staff Member Super Moderator DBSTalk Club

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    For some J6Ps there is just no hope.

    I pass on flight experience because it involves aerodynamics ... them thar solar panels are not wings! Only the F-4 Falcon "flying rock" comes close - but it still has enough lift to fly when propelled. (Cut the engines and you'll find out that the F-4 is NOT designed as a glider.) The only thing that keeps a satellite flying is the centrifugal force balancing it against the Earth's gravity.
     
  13. Apr 26, 2010 #7333 of 10270
    Sixto

    Sixto Well-Known Member

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    I am curious how much adjustment can be made while in space, which is one theory on what's been going on for the past 4-6 weeks, if it's even possible.
     
  14. Apr 26, 2010 #7334 of 10270
    Mike Bertelson

    Mike Bertelson 6EQUJ5 WOW! Staff Member Super Moderator DBSTalk Club

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    Yes, when Centripetal Force equals Gravitational Force the satellite orbits at the same altitude. When Gravitational Force is greater then Centripetal Force, well, then you were riding on Skylab. :D

    Mike
     
  15. Apr 26, 2010 #7335 of 10270
    Satelliteracer

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    I'd like to add my vast scientific background to this discussion and simply say..... wormhole.

    I've always want to say that.

    Thank you.
     
  16. Apr 26, 2010 #7336 of 10270
    James Long

    James Long Ready for Uplink! Staff Member Super Moderator DBSTalk Club

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    Does D12 have steerable spots? Or is that the question?
     
  17. Apr 26, 2010 #7337 of 10270
    mreposter

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    Give that man a donut.
     
  18. Apr 26, 2010 #7338 of 10270
    curt8403

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    in a rather odd Finnish Dialect that would be translated to Maggothole.
    (reference to StarWreck and Captain Pirk)
     
  19. Apr 26, 2010 #7339 of 10270
    Sixto

    Sixto Well-Known Member

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    The question that I've been curious about, is how much of D12 can actually be adjusted in space.

    If, for whatever reason, they decided in mid-March, that they wanted to adjust or test something different, what could they actually adjust.

    Hypothetical ... they had a plan for D12 working with D10 and/or SW1 ... then they did some testing and decided to change things a little bit ... how much could they actually adjust.
     
  20. Apr 26, 2010 #7340 of 10270
    Hdhead

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    Now I get it! D12 is wormhole capable. It can jump from 76 to 103 instantaneously. No need for TLE's because it will just arrive.:eek2:
     
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