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5LNB Disassembled

Discussion in 'DIRECTV General Discussion' started by d0ug, Nov 1, 2007.

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  1. Nov 1, 2007 #1 of 34
    d0ug

    d0ug Legend

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    I thought this might be of some interest to some of you.

    I have a CalAmp 5LNB from a SlimLine that had a damaged F connector. So what else to do with it other than tear it apart to see what's inside =)

    I was browsing though threads earlier today and saw a post about the AT9 LNB, and someone speculated that the 99/101/103 LNB may be a single wideband LNB. I had this damaged LNB, so i figured let's tear it apart and see. Well I am not specifically sure about the AT9 LNB, but in the slimline, there are 3 separate LNBs for 99/101/103

    Damaged LNB, up front, working LNB in the background.
    [​IMG]

    This is what you see on the backside after pulling off all the decorative plastic. I had actually already pulled off the metal cover, but put it back for this pic. The cover was completely weather sealed. The LNB should be able to survive out in the elements without the plastic covering.
    [​IMG]

    All 5 LNBs and multiswitch before further disassembly.
    [​IMG]

    99/101/103 LNBs TOP, and multiswitch BOTTOM
    [​IMG]

    99/101/103 LNBs close up
    [​IMG]

    110/119 LNBs close up
    [​IMG]
     
  2. Nov 1, 2007 #2 of 34
    P Smith

    P Smith Mr. FixAnything

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    I can fixed it :).
     
  3. Nov 1, 2007 #3 of 34
    Greg Alsobrook

    Greg Alsobrook Lifetime Achiever

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    wow... cool photos... thanks for posting!
     
  4. Nov 1, 2007 #4 of 34
    chris0

    chris0 Godfather

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    Where does the power come from to run all those circuits?
     
  5. Nov 1, 2007 #5 of 34
    flipptyfloppity

    flipptyfloppity New Member

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    The power comes up the coax, from either your receiver or from a power inserter.
     
  6. Nov 1, 2007 #6 of 34
    chris0

    chris0 Godfather

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    Thanks.
     
  7. Nov 1, 2007 #7 of 34
    mikepax

    mikepax Legend

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    Thanks for the photos. Have always wondered whats inside!:rolleyes:
     
  8. Nov 1, 2007 #8 of 34
    Stuart Sweet

    Stuart Sweet The Shadow Knows!

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    Actually it seems kind of beautiful, almost like a fancy printed fabric. Funny how good engineering always looks pleasing to the eye.
     
  9. Nov 1, 2007 #9 of 34
    joe diamond

    joe diamond Hall Of Fame

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    That does it. We stop the witch trials here today! Them pictures from the sky are not the work of the dark side. There are electronics inside the round things on the roofs. We assumed the pictures without wire were devil stuff...Who knew?

    Joe

    (Good pics!)
     
  10. carl6

    carl6 Moderator Staff Member DBSTalk Club

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    Can't really tell from your pictures, but do you see any way to isolate and disconnect the 110/119 LNB's so they are not feeding the multiswitch? Perhaps some trace cuts? If so, then the slimline might also be adapted to work with external dishes for 110/119 LOS issues.

    Carl
     
  11. chopperjc

    chopperjc Godfather

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    Was your wife rolling her eyes as you typed that?:D
     
  12. lwilli201

    lwilli201 Hall Of Fame

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    Great closeup pics dOug. Can you post some pics of the other side of the board? Thanks. What does the receiver look like in each feed horn?
     
  13. P Smith

    P Smith Mr. FixAnything

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    She don't care at all and yes, I did fix a few Dish DP/legacy LNBF, perhaps you missed my pictures of it. Due of local policies for 5 MB upload lifetime limit the photos probably gone from the site, but still reside at SatGuys.
     
  14. Rob77

    Rob77 Godfather

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    Thanks Doug....great photo's....appreciate you posting them
     
  15. ddrumman2004

    ddrumman2004 Legend

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    Cool pictures......looks like works of art.
     
  16. d0ug

    d0ug Legend

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    If you look at the last pic of the 110/119 LNB board, in the upper left corner you will see 3 jumper wires over to the 99/101/103 lnb board. These are the only electrical connections that I see to the 110/119 LNB board. These 3 jumpers may be the 75ohm RF signal, 2 of them being equivalent to the center conductors, and one of them being ground. Basically equivalent to those jumper wires between the 2 physically separate LNBs on the AT9.

    If you look at the 3rd pic there are also similar jumpers between the 99/101/103 board and the multiswitch board. These may also be the 75ohm signals from the separate LNBs. So there are potentially 2 places you could disconnect the 110/119 and tap in external dishes. You would have to find a good weatherproof way to get the wires into the 5LNB unit though.




    I can pull the board off the metal and take a picture of the back.

    The actual receiving antennas are on the circuit boards themselves. If you look at the 110/119 LNBs, you'll see a top and bottom vertical trace that just stops, going into that open cross in the board. those traces are the actual receiving antennas, one is for clockwise polarization, and the other for counterclockwise polarization.

    Same thing for the 99/101/103 LNBs, you'll notice that the antennas are vertical for the 99/103 Ka LNBs, and horizontal for the 101 Ku LNB.

    There isn't much else to the receiving antennas. When you look though the holes in the board, all you see is the metal tube going out to the plastic covering, and a stair stepped metal fin which is probably some sort of waveguide. Someone with more RF experience could probably better answer what the exact function of it is.
     
  17. Bill Broderick

    Bill Broderick Icon

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    Not necessarily. If 110/119 can be disconnected from 99/101/103, it may be possible to utilize the 3 dish methodology shown in the second diagram of this post or the two dish methodology show in the diagram from this post, substituting the Slimline for the AT9. It would require more work. But it would be much easier to get the necessary equipment.
     
  18. Milominderbinder2

    Milominderbinder2 Cutting Edge: ECHELON '08

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    How sad is it that we are all this excited about seeing the insides of an LNB? :)

    - Craig
     
  19. lwilli201

    lwilli201 Hall Of Fame

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    Thanks for the great explanation.
     
  20. carl6

    carl6 Moderator Staff Member DBSTalk Club

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    Exactly what I was thinking. If there is no signal going into the internal multiswitch from 110 and 119, then using an external multiswitch to do the mixing just might work (hopefully there would not be infringing signals for 110 and 119).

    Now all we need to do is find someone that is willing to possibly sacrifice a Slimline (carefully lift the jumpers off the solder pads), and test with one or both of the established methods of using an external dish, maybe we can verify all this.

    Carl
     
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