SWMLine LNB failure

Discussion in 'DIRECTV - SWMLine Discussion (private)' started by veryoldschool, May 13, 2008.

  1. veryoldschool

    veryoldschool Lifetime Achiever Staff Member Super Moderator DBSTalk Club

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    [sorry] "A promise to replace and waiting....." :(
     
  2. SFNSXguy

    SFNSXguy EOE

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    Near San...
    So sorry to hear of your recent trials and tribulations! Hope the bruise is fading fast....

    BTW what brand were the failed SWMline LNBs?

    Hope your TV is up ASAP, know how you feel about missing The View.
     
  3. veryoldschool

    veryoldschool Lifetime Achiever Staff Member Super Moderator DBSTalk Club

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    :lol: :lol:

    SWMline LNB= Eagle Aspen
    Slimline LNB from DirecTV [set]= Andrew
    Slimline LNB from installer [sometime back]= WNC, which was the same as my [now dead] AT-9 LNB.

    Thank God for OTA so I can watch Regis and Kelly :lol:
     
  4. SFNSXguy

    SFNSXguy EOE

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    So you have had one of each brand die, is that correct? If so, I'd climb on a plane to Vegas ASAP.
     
  5. veryoldschool

    veryoldschool Lifetime Achiever Staff Member Super Moderator DBSTalk Club

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    So I can lose on every table I play at?
    I'm not going for a lotto ticket either. :lol:

    < see avatar
     
  6. SFNSXguy

    SFNSXguy EOE

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    Near San...
    Nah, you could make a bundle as a "cooler."
     
  7. bwaldron

    bwaldron Impossible Dreamer

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    With VOS' luck these days, I wouldn't try Vegas ... or get on a plane to anywhere. :)
     
  8. veryoldschool

    veryoldschool Lifetime Achiever Staff Member Super Moderator DBSTalk Club

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    !rolling
     
  9. veryoldschool

    veryoldschool Lifetime Achiever Staff Member Super Moderator DBSTalk Club

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    Ironwood just left.
    One installed Slimline LNB,
    One known working spare,
    "A promise" to have a SWMline LNB here today "if possible".

    I now have TV for tonights CE. :hurah:

    :D
     
  10. bwaldron

    bwaldron Impossible Dreamer

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    Careful now...you haven't made it to tonight yet ;)
     
  11. smiddy

    smiddy Tain't ogre til its ogre

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    Kewl man...now let's hope my troubleshooting rewards me as well once I get home...

    :goodjob:
     
  12. veryoldschool

    veryoldschool Lifetime Achiever Staff Member Super Moderator DBSTalk Club

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    Part of me wants to go with the "smart money", but it's just not "my style".

    So, RodertE go have a beer on me. I own you one.

    The tech came out this morning and the first thing he asked was "what do you want?"
    It seems when he turned into my driveway, his thoughts were "this guy want what? There is no way he can get a SAT signal here."
    Well there is one and only one way. By no means is it "standard or normal". I have a 30' pole [OTA antenna] at the edge of my property, with the dish mast bolted to it and hanging over my neighbor's lot. No fences here and a lot of trees, so it's "just nestled in between" an oak.
    What you get with a "fresh" set of eyes is a different perspective. He climbs up my crappy ladder with a new LNB and his birddog. As he sweeps the dish to get a signal, it runs into the mast, so he grabs the "J pole" and yanks it around so the dish doesn't collide. When I get out there, he explains that the main mast is moving. :confused: that thing is set in concrete. He yanks again to show me and sure enough it will sweep 20 degrees off axis.
    "The guy" was pretty good and showed off all of the SWM "stuff", showed him my SWM meter and walked him through what it did & how it worked. His reply: "where's mine?"
    He leaves me a known working LNB spare, installs one on the dish and we're off to check the DVRs.
    He takes off [maybe 20 min here tops] and I go get a bag of concrete. The Main mast is on a shorter piece that's buried in the ground. The two have a rivet "pinning" it in place.
    "Why" I have no idea, but the rivet sheered. Re-pinned the mast, went back over all of the LNBs with the dish peaked, and to my surprise, ALL of them work. :blush:

    Why things moved after two years, is a mystery to me. We have had horrible storms and nothing moved. The day the SWM stopped give me a signal, it was calm clear, dry day. The AT-9 "went out" on a windy day and it did have problems with 101 even tps before it did.

    SO: I'm back on the SWMLine & have a corner on the market for [working] Slimline LNBs:
    2 WNC
    1 Andrew
    1 Cal Amp

    And most likely a working AT-9, but I'm not going to mount the dish to check it out. :nono2:

    Enough of this eating crow..... :lol:

    But these are the facts, and that is what is part of field testing.
     
  13. bwaldron

    bwaldron Impossible Dreamer

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    Well, it is easy to take things as "givens" that aren't. But boy, you seemed to be on an unprecedented run of bad hardware...so it is good to know that the QC of DirecTV and their suppliers is not as bad as it looked :)

    All's well that ends well.
     
  14. Mike Bertelson

    Mike Bertelson 6EQUJ5 WOW! Staff Member Super Moderator DBSTalk Club

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    Keep in mind I have no idea what your mast/pole looks like but I have a theory...

    Fatigue...Stress ratcheting due to cyclic loading in this case almost exclusively due to temperature changes.

    Usually you want a certain amount of flexibility in a system. As it travels through the stress ranges of cyclic loading the flexing keeps the stress extremes away from yield. Sooner or later you exceed the elastic limits at the surface of the member under load (the rivet in this case) reducing the cross section. When it goes it will be quick. It would be tight as a drum today and a floppy mess tomorrow. Make no mistake, unless it was one hefty rivet, it was gonna go.

    If you have a system that needs to be very stiff, as in this case, it needs to be designed much stronger than the same system that is able to flex and move.

    BTW, I'm a Mech Eng who spends most of his time doing flexibility analysis (Finite Element Computational Applied Mechanics)...even so it's still just a guess.

    Mike
     
  15. RobertE

    RobertE Active Member

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  16. smiddy

    smiddy Tain't ogre til its ogre

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    Wow, that is very kewl man! You know what they say, sometimes it is the simplest of things that we over look that are staring us right in the face and are the problem. Kewl man...hey, got an extra PI? :blush:

     
  17. smiddy

    smiddy Tain't ogre til its ogre

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    Mike, do you have any microwave channeling experience? I know a company looking...;)
     
  18. veryoldschool

    veryoldschool Lifetime Achiever Staff Member Super Moderator DBSTalk Club

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  19. Mike Bertelson

    Mike Bertelson 6EQUJ5 WOW! Staff Member Super Moderator DBSTalk Club

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    If microwave channeling involves popcorn and hot pockets then yeah. :lol:

    Mike
     
  20. smiddy

    smiddy Tain't ogre til its ogre

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    Uhm, no, L-Band stuff mainly...but I will check just the same, I like putting these geeks on high order jsut to mix things up. :)
     

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