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Can I Install a 5-LBN on a 3-LBN Dish?

Discussion in 'DIRECTV Installation/MDU Discussion' started by mdgrice, Dec 15, 2007.

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  1. mdgrice

    mdgrice Cool Member

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    Can I insert a 5-LBN "Head" on a 3 LBN Oval Dish? My HD locals and everything I think I want/need are on 103 and 110. So I don't need the extra wide dish. Wilt the 5-lbn fit on the 3 dish and work? Anybody done this?
     
  2. RAD

    RAD Well-Known Member

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    Dripping...
    I've never heard of that being done. And don't forget that DirecTV 11 goes up next year and it will also have national HD channels on it so you'll need that slot also.
     
  3. veryoldschool

    veryoldschool Lifetime Achiever Staff Member Super Moderator DBSTalk Club

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    I'm not sure if the two assemblies are the same size, so the arm mount may not fit, or the focal point may be off too.
    Even if you could, the smaller dish [reflector] would mean you would have lower signal levels.
     
  4. leww37334

    leww37334 Hall Of Fame

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    Remember, the dish shape determines how signal from the satellite is collected and directed to the LNB. Even if you could install the LNB I suspect the signal you got from it would not be very good.
     
  5. bonscott87

    bonscott87 Cutting Edge: ECHELON '07

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    No, there is no way. The 5 LNB requires the 5 LNB dish reflector to get the new sats which is much larger then the old 3LNB dish. And as mentioned, even if you could rig it up the focal points are different. Same reason you cannot use an AT9 5LNB with a 5LNB Slimline or visa versa. Everything is different.
     
  6. Mike500

    Mike500 Hall Of Fame

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  7. bonscott87

    bonscott87 Cutting Edge: ECHELON '07

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    However that's not what he's asking. He's asking if he could just take off the LNB from his 3 LNB dish and just put on a 5LNB on it still using the same dish which you cannot.
     
  8. carl6

    carl6 Moderator Staff Member DBSTalk Club

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    Another issue is that "everything you want/need" isn't only on 103 and 110. Guide data is sent on 101 and 119. If you tune to one of the mpeg4 HD channels and stay there, and do not have view of 119, you won't get guide data updates. And you can't run without 101.

    Carl
     
  9. davring

    davring Hall Of Fame

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    D* could have saved a bundle if they could have just swapped LNB's for the upgrade to receive the 99/103 sats.
     
  10. Mertzen

    Mertzen Hall Of Fame

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    Just doesn't work that way.

    HAd a trouble call where someone had mounted the arm and LNB of a slimline to the reflector of an old Ka/Ku dish. That was giving loads of problems.

    The only thing they could have done was make a dish that mast compatible. but with that wide a view it just didn't work out.

    Word is though that a smaller 99/101/103 dish might be coming for certain markets.
     
  11. tonyd79

    tonyd79 Hall Of Fame

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    There is guide data on 119 now? I thought it was all on 101. Is it duplicate or different guide data on different sats?
     
  12. RobertE

    RobertE New Member

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    If so, thats just plain stupid.

    What sort of whacked out logic says, lets put the guide data for 103 programming on the 119 bird.

    Hell, why not move all the guide data over to the 72.5 and make everyone use a second (or third) dish.
     
  13. litzdog911

    litzdog911 Well-Known Member

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    Yes, the Guide Data is duplicated on 101 and 119. The technical reason that Guide Data for 103 is beamed from 119 has to do with the way that DirecTV Receivers signal the dish to provide the correct satellite/transponders (DC voltages and 22kHz switching tone). What your Receiver's tuner is tuned to a 103-deg W transponder, that tuner can't "see" any of the 101-deg W transponders, but it can "see" 119-deg W. Now what I don't understand is why they simply don't also beam the Guide Data from 103-deg W --- that may have something to do with how the Receivers are wired to downloand/decode Guide Data.
     
  14. veryoldschool

    veryoldschool Lifetime Achiever Staff Member Super Moderator DBSTalk Club

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    Let's take a step back to the "old days", where I'm watching something from 110 all day long. Where is my guide data going to come from? I'm not tuned to 101.
    Say my local SD comes off a spot from 119, again I watch these all day long. If the guide data didn't come off 119, I'd never get an update.
    Since this is how it worked even before HD, why is it so "stupid"?
     
  15. RobertE

    RobertE New Member

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    Still doesn't make sense.

    Assuming only one single tuner box. If I'm on a channel that is on 103, where does the guide come from?

    It would make sense to have all the guide on all the sats, but I don't know how much bandwidth that takes.

    Still stupid in my book. :grin:
     
  16. litzdog911

    litzdog911 Well-Known Member

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    It comes from 119-deg W.
     
  17. bonscott87

    bonscott87 Cutting Edge: ECHELON '07

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    Technically impossible. There is a reason why the dish itself is over twice the size of the 3LNB dish. The KA signals require a much bigger dish. Heck, my FTA dish is a meter wide which is even bigger then the 5 LNB dish. Just the way satellite signals work.
     
  18. RobertE

    RobertE New Member

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    And if I never change from a 103 channel?

    Thats what makes no sense. If I only every watch something on the 103, why should 119 even be part of the equation?
     
  19. veryoldschool

    veryoldschool Lifetime Achiever Staff Member Super Moderator DBSTalk Club

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    As you know, there are two voltage/tone. 103 a & b [or S & C] comes in above and below the Ku from 119, so the 950-1450 MHz band is always there, whether from the 101 or the 119 SATs.
    The guide data must be on both an even and odd transponders from 101 & 119. With these four transponders carrying the guide data, it is always available no matter what SAT is tuned to for the programing.
     
  20. litzdog911

    litzdog911 Well-Known Member

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    Actually bad things will happen ....
    I had this problem with my H21 HD Receiver until I modified my multiple dish setup to receive 119-deg W. If my H21 was tuned to one of the new HD channels for more than a day or so, the Receiver would hangup when the Guide Data ran out requiring a reset.

    A workaround for folks with no 119 reception is to use Autotune to set the Receiver to an SD channel beamed from 101 in the middle of the night.

    It's less of a problem with DVRs because most use two tuners and it's less likley that both tuners would be set to one of 103's HD channels for more than a day.
     
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