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Sats 103(ca) and 103(cb); what's the difference?

Discussion in 'DIRECTV Installation/MDU Discussion' started by tweaked, Jan 3, 2011.

  1. Jan 3, 2011 #1 of 16
    tweaked

    tweaked AllStar

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    I have significantly higher signal quality numbers coming from 103(cb) as opposed to 103(ca). I'm guessing they're two different sat's; one in Ka(hi) band and the other Ka(lo) ... ?
     
  2. Jan 3, 2011 #2 of 16
    Kevin F

    Kevin F Hall Of Fame

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    One is the d10 satellite while The other is the d12 satellite
     
  3. Jan 3, 2011 #3 of 16
    Davenlr

    Davenlr Geek til I die

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    Correct. A big signal difference could indicate a loose connection on the coax, bad coax, or a bad/weak BBC. They should be within about 5 or so points of each other. Might check both tuners, if using BBCs, and that will tell you if it is one of those, or the coax. If both tuners are the same, and still have that big of a difference, it might be a bad LNB.

    How much difference are you seeing?
     
  4. Jan 5, 2011 #4 of 16
    SBI

    SBI AllStar

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    And what is the difference between the two?

    And if I may hijack this thread, what is 99C vs 99S? I have excellent signal on C, but nothing at all on S. Same with 103.

    Thanks!
     
  5. Jan 5, 2011 #5 of 16
    P Smith

    P Smith Mr. FixAnything

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    Conus ans Spotbeam.
     
  6. Jan 6, 2011 #6 of 16
    HoTat2

    HoTat2 Hall Of Fame

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    The DirecTV-10 satellite located at 103 WL nominal transmits its national or "CONUS" (plus Alaska and Hawaii) programming on the lower portion of 18.3-18.8 GHz or the Ka "B-band." Thus titled "103cb" on 14 transponders numbered 1-14.

    DirecTV-12, the newest addition to the fleet also positioned at 103 WL nominal, transmits its national programming on the upper majority of 19.7-20.2 GHz called the satellite Ka "A-band." Therefore labeled as "103ca" on 16 transponders numbered 9-24.

    Both satellites however send local programming ("LiLs") on a grid of spotbeams covering CONUS, AL., and Hawaii by repetitively reusing 10 transponder frequencies in the upper portion of the B-band, titled "103s"

    As P. Smith says, "c" is for CONUS programming which is actually coming from the DirecTV-11 satellite located at 99 WL nominal, thus "99c." And "s" is for spotbeam local signals emanating from a combination of A and B band transmissions from Spaceway 2 also at 99 WL nominal (transponders 1-6) along with DirecTV 11 (transponders 15-24). Thus called "99s."

    Then there's some sort of problem as the transponder mapping information shows the Boston DMA locals on 99s transponders 15, 22, and possibly 17 (listed as "test" at the moment) and transponder 4 at 103s. So you should be receiving signal readings on those transponders.

    Are you presently receiving your local channels?
     
  7. Jan 6, 2011 #7 of 16
    tweaked

    tweaked AllStar

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    That's what I was looking for... thanks!
     
  8. Jan 6, 2011 #8 of 16
    P Smith

    P Smith Mr. FixAnything

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    Connections between sat, positions, beams, conus, transponders and channels are perfectly described in gct's tables - check his dedicated thread.
     
  9. Jan 7, 2011 #9 of 16
    SBI

    SBI AllStar

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    OK, thanks for that info!
    I guess I should have been more specific as I am getting a signal of 100 on 99s 15-17, transponder 22 is 57 though. When I said "zero" on that satellite I probably saw the first few and assumed that this is what I was getting on all transponders.
    103s xpdr 4 is 100.
    I am receiving all local channels, however it seems to be very slow to tune in to channels (local and non-local). I am getting the info bar fairly quickly, but it takes few seconds for the channel to show up.

    BTW - what is satellite SWM? As you can see, I am getting a bit different results on that one between the HDDVR and the HD.
     

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  10. sungam

    sungam Legend

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    SWM is not a satellite, it is the Single Wire Multiswitch and those readings are for the nine frequency bands used by the SWiM system. They aren't interpreted tha same way as other signal readings. There are a number of threads on how the SWiM system works that you can refer to for more information.
     
  11. cnmurray8

    cnmurray8 Legend

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    I thought Boston was on 99s transponders 15 and 17? I think Burlington vt is on 22.
     
  12. P Smith

    P Smith Mr. FixAnything

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    If you want avoid guesses, take a look into gct's maps - see his dedicated thread here.
     
  13. liquidctv

    liquidctv Legend

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    >I am getting a signal of 100 on 99s 15-17

    I doubt it. Best I've seen on any 99c or 103ca/cb is 95-97. I think I saw a 98 once. Edit: I've never seen 99s actually.

    >it seems to be very slow to tune in to channels

    Consistent with getting some zeroes on your swm channels. I am diagnosing a customer right now with a similar problem. May be a lack of grounding issue.

    >BTW - what is satellite SWM?

    Swm is your INTERNAL house network. Each "transponder" corresponds to a TV (or tuner) in your house. Something is wrong with your wiring, switching, grounding, LNB, or power supply if you are getting 0's here.
     
  14. woollybully

    woollybully Mentor

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    Has anyone done an eye chart with the optimal signal strength on each transponder by city? Would be a nice guide to let us know if we are getting close enough on signal strength.
     
  15. veryoldschool

    veryoldschool Lifetime Achiever Staff Member Super Moderator DBSTalk Club

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    More than likely there isn't ANYTHING WRONG here.
    Any tuner will show a zero on "another receiver that is on the SWM screen".
    To know/check if there is any problems with them, you MUST have ALL receivers on the signal screens, thus freeing up all the SWM channels.
    From this position, each time a receiver exits the setup menu, it will take one or two channels for its use. THESE WILL SHOW zeros on the other receivers still on the SWM screen.
     
  16. Stuart Sweet

    Stuart Sweet The Shadow Knows!

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    VOS is absolutely right here. There's a lot of counfusion as to how to use that screen, since "0" means "something's connected" which is sort of the opposite of the other screens.
     

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