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D10 Satellite TECH THREAD - HD Testing Schedule / Press Releases / Location

Discussion in 'DIRECTV General Discussion' started by Sixto, Jul 6, 2007.

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  1. Aug 11, 2007 #601 of 2718
    Tom Robertson

    Tom Robertson Lifetime Achiever DBSTalk Club

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    Actually D8 and D9 were likely the first MPEG4 satellites, but are only used for backhaulling local channels to the broadcast centers.

    S1 and S2 were the first MPEG4 to the homes and only via spotbeams. While technically capable of CONUS coverage, it takes too much power away from everything else.

    D10 and D11 are very much able to do spotbeams, tho via more conventional Travelling Wave Tube Amplifier transponder (TWTA), not the really cool phased array that the Spacesways use. (The Spaceways can adjust the size, shape, strength, and number of spotbeams instantly on demand!)

    Cheers,
    Tom
     
  2. Aug 11, 2007 #602 of 2718
    qlanus

    qlanus Legend

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    FWIW - I use a satellite tracking program, Orbitron, which automatically pulls down updated TLE files. Today is the first time I've seen Directv 10 appeared in the 'geo' TLE file automatically.

    Perhaps we're now 'there'.
     
  3. Aug 11, 2007 #603 of 2718
    RAD

    RAD Well-Known Member

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    Dripping...
    Tom, did you really mean to say that since there is no such thing as an MPEG4 satellite.
     
  4. Aug 11, 2007 #604 of 2718
    Tom Robertson

    Tom Robertson Lifetime Achiever DBSTalk Club

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    You are correct at the detail level, but step up 5,000 feet higher and my loose use of terminology isn't so inaccurate. :)

    Yes, MPEG4 encoding can be utilized on any of the satellites. But DIRECTV has only used it to the home on S1 and S2 with a soon on D10. :)

    Cheers,
    Tom
     
  5. Aug 11, 2007 #605 of 2718
    Interceptor

    Interceptor Legend

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    I noticed that, too. However, the data that Orbitron is pulling from celestrak and Space-Track through the update feature is still the data from yesterday. If you go directly to Space-Track's website and look it up manually, it will give the current set. I've been manually inserting the data into Orbitron.

    Mike
     
  6. Aug 11, 2007 #606 of 2718
    Ken984

    Ken984 Active Member

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    Bossier...
    With that latest TLE eccentricity is way down. Ap v per is down to less than 200km now..getting closer..

    Name DIRECTV10
    NORAD # 31862
    COSPAR designator 2007-032-A
    Epoch (UTC) 2007-08-11 08:00:09
    Orbit # at Epoch 36
    Inclination 0.143
    RA of A. Node 283.947
    Eccentricity 0.0021190
    Argument of Perigee 22.380
    Revs per day 1.00119222
    Period 23h 58m 17s (1438.28 min)
    Semi-major axis 42 208 km
    Perigee x Apogee 35 740 x 35 919 km
    BStar (drag term) 0.000100000 1/ER
    Mean anomaly 30.496
    Propagation model SDP4
    Element number / age 52 / 0 day(s)
    StdMag (MaxMag) / RCS N/A
    Diameters N/A
    Satellite group N/A
     
  7. Aug 11, 2007 #607 of 2718
    LameLefty

    LameLefty I used to be a rocket scientist

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    Middle...
    Yeah, Ken's right - not "there" yet but getting closer. A true GSO will have zero difference between apogee and perigee, or very very close within the limits of reason - Earth isn't exactly circular and there are some masscons (mass concentrations) at various points inside the earth that create very minor perturbations in orbits due to the tiny variance in gravity. But anyway, once the eccentricity drops to about 50 times lower (four leading zeros rather than two), we'll be "there" in all practical sense.

    I will also note, however, that the recent tweaks to the orbit are occurring in such a way as to keep the sat oscillating relatively close to it's intended test and final slots. I suspect a lot of basic testing is already going on.

    P.S. Sorry for being out of the loop on updates today - my daugher's select soccer team had their first games this weekend in our lovely 102 degree heat today and we just got home. Ugh.
     
  8. Aug 11, 2007 #608 of 2718
    MikeR

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    Thanks lefty for the update - I feel like my 4 year old - "are we there yet"? every 2 minutes.

    Kick back and enjoy the meteor shower.
     
  9. Aug 11, 2007 #609 of 2718
    P Smith

    P Smith Mr. FixAnything

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    Video compression technology have nothing to do with spacecrafts or RF equipment.
     
  10. Aug 11, 2007 #610 of 2718
    DawgLink

    DawgLink Woof Woof Woof

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    I have not the slightest clue what 99% is being said but I did see "almost there" at one point so that's good
     
  11. Aug 11, 2007 #611 of 2718
    Dolly

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    Congrats you are 1 percentage point lower than I am :) But like you I understood "almost there" :sunsmile:
     
  12. Aug 11, 2007 #612 of 2718
    Alan Gordon

    Alan Gordon Chancellor

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    I'm glad you corrected that Tom, as I was planning on correcting you since DirecTV's first use of MPEG4 encoding was actually from one of the satellites at either 101, 110 or 119.

    However, like you said, their first use of MPEG4 encoding to the home was done via spot-beams from the first SpaceWay to Detroit, and the first use of MPEG4 encoding was only available at CES via a SPECIAL DirecTV receiver!

    ~Alan
     
  13. Aug 11, 2007 #613 of 2718
    EaglePC

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    My Reciever is funny H20 - 600 Software X014
    Satellite 101* (A) : OK
    Satellite 119* (B): OK
    Satellite 110* (C): OK
    Satellite 99* NETWORK 10): FAILED "is the the new sat D 10" ???
    Satellite 99* NETWORK 11): OK
    Satellite103* NETWORK 14): FAILED
    Satellite 103* NETWORK 15): FAILED
     
  14. Aug 11, 2007 #614 of 2718
    Tom Robertson

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    That was the thrust of my first post. It was D8 at 101 but for backhauling purposes. :)

    Cheers,
    Tom
     
  15. Aug 11, 2007 #615 of 2718
    donshan

    donshan Godfather

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    Thanks, I appreciate your post and still have a lot to learn about how this works. I do video editing and basically understand how MPEG codecs work in a PC. but almost nothing about what goes on electrically in the satellite.

    It would then be much like broadcast HDTV then, except in different RF bands. The digital data in whatever form (MPEG-x) is encoded by DirecTV on the ground before the uplink to the satellite and then it is rebroadcast on the satellite's RF frequency to our dish for decoding in our receivers? ( and pardon if I don't have the terminology just right:) )
     
  16. Aug 11, 2007 #616 of 2718
    Alan Gordon

    Alan Gordon Chancellor

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    Actually, I was referring to:

    DIRECTV Demonstrates World's First Live MPEG-4 AVC HD Transmission via Satellite; Advanced Transmission and Compression Technology will Support Massive Expansion of Programming

    That was January 6th, 2005. DirecTV 8 was launched in May of 2005 (per your "DirecTV and KA" thread)... but as I said before, it was not delivered to subscriber's homes... only to CES.

    ~Alan
     
  17. Aug 11, 2007 #617 of 2718
    Ken984

    Ken984 Active Member

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    Bossier...
    D10 is going to 103 actually 102.8. H20 has had some issues with the tests on the KA sats so you may want to check your software version and see if its one of the known issues.
     
  18. Aug 11, 2007 #618 of 2718
    Tom Robertson

    Tom Robertson Lifetime Achiever DBSTalk Club

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    Ok, :) I'll accept the update. In fact, I'll work your post into the KA thread. Thanks.

    Cheers,
    Tom
     
  19. Aug 11, 2007 #619 of 2718
    n2deep2bn

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    Everything looks good. Testing should be going on now.
     
  20. Aug 11, 2007 #620 of 2718
    EaglePC

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    OK the BIRD is where it should be finally.
    lets lock this thread and start a new D10 Test Results Thread:hurah:
     
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