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DirecTV National HD Listing/Maps Discussion Thread (Technical - Not Anticipation)

Discussion in 'DIRECTV Programming' started by Sixto, May 29, 2012.

  1. P Smith

    P Smith Mr. FixAnything

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    Ah, that's in FCC docs.
     
  2. cypherx

    cypherx Hall Of Fame

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    I thought it was 36 MHz.. but per chance the Spaceways *MAY* have bandwidths as much as 62.5 MHz.
     
  3. veryoldschool

    veryoldschool Lifetime Achiever Staff Member Super Moderator DBSTalk Club

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    Both sound "about right".
     
  4. P Smith

    P Smith Mr. FixAnything

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    FCC docs stats 36 MHz for Ka sats of D## series. IMO, SW could have 70 or 80 MHz tpns, but we have no docs to support that by facts.
     
  5. doctor j

    doctor j Hall Of Fame DBSTalk Club

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    Documents here:

    http://licensing.fcc.gov/cgi-bin/ws...=V_SITE_ANTENNA_FREQ.file_numberC/File+Number

    Go to "Attachment Menu" Then "Exhibit D"

    I've copied a segment from page #11

    "When the satellite is operated in the non-processor mode it can be viewed as supporting 8 contiguous 62.5 MHz channels"

    Doctor j
     
  6. P Smith

    P Smith Mr. FixAnything

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    More interesting facts:
     
  7. veryoldschool

    veryoldschool Lifetime Achiever Staff Member Super Moderator DBSTalk Club

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    While phased array can be quite flexible, The CONUS beam testing didn't turn out to be too successful.

    In the end, measuring what bandwidth DirecTV is actually using might be of more use.
     
  8. P Smith

    P Smith Mr. FixAnything

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    Last time ( it was a few years ago) I posted these pictures ... don't recall measurements...

    Just fired my SA PSA-37D ... 35..36 MHz per tpn in a range 250...750 MHz range.
     
  9. veryoldschool

    veryoldschool Lifetime Achiever Staff Member Super Moderator DBSTalk Club

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    Thanks, and I knew you'd done it before.
    So now we have "facts". :)

    So now that we know the BW is 36 MHz, if this is only getting 38 Mb/s, it must be using the worst modulation technique known to man.

    I'm by no means an expert on types of modulation but if it's only 1 Mb/s/MHz this sounds basically primitive analog, which we know it isn't.
     
  10. charlie460

    charlie460 Godfather

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    I would be curious to know what bitrate and whether or not they are using the new encoders for the Audience Network. The picture quality is quite bad on tonight's Damages premiere. Lots of artifacting.
     
  11. sigma1914

    sigma1914 Well-Known Member DBSTalk Club

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    They film it crappy... It's been horrible since FX days.
     
  12. P Smith

    P Smith Mr. FixAnything

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    Post sat, tpn, PID and time if you want the numbers or a plot.
     
  13. P Smith

    P Smith Mr. FixAnything

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    Measured data rates:
    for Ka, DVB-S2D, SR=30 Msps:
    QPSK 3/5 35 Mbps
    QPSK 2/3 39 Mbps
    QPSK 4/5 47 Mbps
    8PSK 3/5 52 Mbps
     
  14. charlie460

    charlie460 Godfather

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    I'm not just talking about that "soft" filter look they have throughout the show, there seems to be artifacting due to what looks to me like bitrate starvation.

    I am not sure how to find the PID of a channel, can that be done via a serial command (using the HTTP API)?

    EDIT: While I'm still curious whether that information can be determined via serial, I pulled the following information from the 7/4 excel spreadsheet here:

    D10 @ 103W (103CB)
    TPN: 1
    TID: 124
    VPID: 1050

    EDIT 2: I got the following hex response for the FA83 serial command, I'm not sure how to parse this in order to get useful information:
    Code:
    0065FFFF1009FF10501052FFFF000F7C13070C01351604000000000000000000<removed sensitive info>   
     
  15. P Smith

    P Smith Mr. FixAnything

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    Right now the PID taking 3+ Mbps, a plot will be ready in one hour.
     
  16. P Smith

    P Smith Mr. FixAnything

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    Get the document here http://www.dbstalk.com/showpost.php?p=1709214&postcount=23; page 17:
    0065 - ch# 101
    FFFF - n/a
    10 - video:MPEG-4/H.264
    09 - audio: AC3
    FF - n/a
    1050 - VPID
    1052 - APID
    FFFF - n/a
    000F - net# [15]
    7C - TID [124]
    13 - year + 1993 [2012]
    07 - month [July]
    0C - day [12] GMT
    01 - hh [01] GMT
    35 - mm [53] GMT
    16 - ss [22] GMT
    04 - weekday [Thursday] GMT
    00000000 - ROM v
    00000000 - STS ID
    00 - STS Ver
    0000...... - CARD ID 00xx-xxxx-xxxx
    63 - Signal [99]
    000..... - RID xxxx xxxx xxxx
     
  17. charlie460

    charlie460 Godfather

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    :eek2: that's quite low.
     
  18. P Smith

    P Smith Mr. FixAnything

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    Slow raising, now is 4.72 Mbps (is channel # 101 right one ?)
     
  19. charlie460

    charlie460 Godfather

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    Yep, that's it.
     
  20. P Smith

    P Smith Mr. FixAnything

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    I'll post the plot when the 1 hr ends. Check above my decoding of your hex response.
     

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