DIRECTV Satellite Discussion D-15 @103W

Discussion in 'DIRECTV General Discussion' started by Gary Toma, Jun 4, 2014.

  1. HoTat2

    HoTat2 Hall Of Fame

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    Agreed;

    Even though I see Gary adding a speculative new blank signal level screen grid labeled "103_" in the Network Decoder diagrams in anticipation of D15. I really don't think we are going to see one since it's Ka band payload fully overlaps with the existing 103ca and 103cb screens.

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  2. slice1900

    slice1900 Well-Known Member

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    Well at some point, some receivers will see something for 99 & 103 RDBS, Whether if it is used exclusively for 4K or used for some HD/SD programming (mirroring of 95 & 119 is the only non-4K thing they could reasonably put there) will determine which receivers will see those two new screens appear.
     
  3. HoTat2

    HoTat2 Hall Of Fame

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    Oh, for sure

    My post earlier was pertaining to a prospective future SS screen for D15's Ka band payload.

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  4. Ken984

    Ken984 Active Member

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    Another TLE update. I didn't post the last one it was too similar to the one before. This one is more of a change.

    1DIRECTV 15
    Lon 66.7751° W
    Lat 0.0710° S
    Alt (km) 35 785.810
    Azm 136.5°
    Elv 42.3°
    RA 15h 18m 48s
    Decl -5° 15' 32"
    Range (km) 37 603.996
    RRt (km/s) 0.000
    Vel (km/s) 3.075
    Direction Ascending
    Eclipse No
    MA (phase) 83.5° (59)
    TA 83.5°
    Orbit # 28
    Mag (illum) ? (84%)
    Constellation Lib


    Name DIRECTV 15
    NORAD # 40663
    COSPAR designator 2015-026-A
    Epoch (UTC) 2015-06-19 05:42:05
    Orbit # at Epoch 27
    Inclination 0.097
    RA of A. Node 262.003
    Eccentricity 0.0000446
    Argument of Perigee 240.466
    Revs per day 1.00272377
    Period 23h 56m 05s (1436.8 min)
    Semi-major axis 42 165 km
    Perigee x Apogee 35 785 x 35 788 km
    BStar (drag term) 0.000000000 1/ER
    Mean anomaly 143.403
    Propagation model SDP4
    Element number / age 999 / 0 day(s)
    StdMag (MaxMag) / RCS N/A
    Diameters N/A
    Satellite group Geostationary
     
  5. P Smith

    P Smith Mr. FixAnything

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    Perhaps IOT position does not required maintain in tight box and the sat is just testing with relaxing hold on place...
     
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  6. lwilli201

    lwilli201 Hall Of Fame

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  7. HoTat2

    HoTat2 Hall Of Fame

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    Would the satellite really need the freedom to "move around" from it's orbital slot in order to reorient or change it's attitude with respect to the earth to position and move it's downlink beams over Castle Rock from peak to edge for antenna pattern measurement and verification?

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  8. bakers12

    bakers12 ΔS > 0

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    Has anyone with a spectrum analyzer been able to detect signs of life from DIRECTV 15?
     
  9. P Smith

    P Smith Mr. FixAnything

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    want some? There is cheap one -BLSA PCI card - it has nice software, you could make "waterfall" spectrum and see changes during a day
     
  10. bakers12

    bakers12 ΔS > 0

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    I'm too lazy to aim a new dish at the IOT location, though. :grin:
     
  11. Diana C

    Diana C Hall Of Fame DBSTalk Club

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    Doesn't "require" it, but each time they rotate the satellite (which is usually done with the momentum wheels) the thrusters point in a different direction, which means the station keeping delta-V has to be recalculated. That can certainly be done, but it slows things down, since they would need to stabilize it in its new orientation before proceeding with testing. If they have the room, and no one objects, it makes life a lot easier to let it drift a bit out of the standard box now and then.
     
  12. Jul 1, 2015 #512 of 812
    slice1900

    slice1900 Well-Known Member

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    So with 14 days of IOT scheduled, it should be starting its drift westward about now. Any TLEs showing movement?
     
  13. Jul 1, 2015 #513 of 812
    HoTat2

    HoTat2 Hall Of Fame

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    FWIW, just doing the quick lazy check, N2YO has nothing so far. Still at 66.8W hovering over the NW conner of Brazil.

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  14. Jul 1, 2015 #514 of 812
    P Smith

    P Smith Mr. FixAnything

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    as usual - just wait for final destination TLE

    [is DTV have a power to suppress posting TLEs ? seem to me it does :( ]
     
  15. Jul 8, 2015 #515 of 812
    I WANT MORE

    I WANT MORE CowboySooner

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    Thats long enough. Light er up!!!
     
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  16. Jul 8, 2015 #516 of 812
    slice1900

    slice1900 Well-Known Member

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    According to the TLEs it doesn't appear to have even started its drift from the IOT location, so it won't even reach 103* until August unless they schedule a faster drift to make up whatever delay is keeping it at the IOT location longer than planned.
     
  17. Jul 8, 2015 #517 of 812
    fleckrj

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    Has a TLE been published since June 19? IF so, I have not seen it. If not, the bird could already be well on its way to 103. I doubt we will hear anything official until it is parked at 103.
     
  18. Jul 8, 2015 #518 of 812
    slice1900

    slice1900 Well-Known Member

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    I don't know how to tell how old they are, but the sites I found googling show D15 still at 66, though that's useless if the TLE is out of date. For whatever reason there were blackouts of TLE updates on D14 and the Ku-79W satellites, so maybe the same is true here, though those were only for a few days not 2+ weeks.
     
  19. Jul 8, 2015 #519 of 812
    Ken984

    Ken984 Active Member

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    There have been several TLE's but nothing major changing. Inclination has been lowered from over 1 to around .68 if my memory serves ( i am not infront of Orbitron at the moment). The last TLE I saw showed Eccentricity was around 1500, which could be a sign of a small change to the orbit but it was still sitting at 66.7 or so when I looked at it.
     
  20. Jul 8, 2015 #520 of 812
    HoTat2

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    Here's the latest TLE from Spacetrak;

    1 40663U 15026A 15188.39377387 -.00000287 00000-0 00000+0 0 9990
    2 40663 000.0684 247.4006 0001495 286.6467 185.9466 01.00273220 466

    As you can see the Epoch day is 188 which is July 8th or today. Someone can run Orbitron on it.

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