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A silly sounding signal strength problem

Discussion in 'General DISH™ Discussion' started by CeeWoo, Apr 7, 2013.

  1. Apr 7, 2013 #1 of 13
    CeeWoo

    CeeWoo Godfather

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    I have a Dish500 and VIP211k receiver that I use in my travel trailer. I don't have any problems aiming it (I've done it many times) but the last few trips I've found that when the dish is out in an exposed area (not shaded), that after the sun has shown directly on it for some time, my signal strengths have slowly weakened. Not a 'big' problem, but the last couple times, it's begun to reach the point that most, if not all, HD signals are too weak to view. I've checked my connections and have tried different cables and connectors.

    Could this possibly be a sign that my LNBf is going bad?

    Oh, btw, once the sun goes down, everything is 'back to normal'
     
  2. Apr 7, 2013 #2 of 13
    puckwithahalo

    puckwithahalo Hall Of Fame

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    It sounds like your LNB has developed heat sensativity and needs to be replaced.
     
  3. Apr 7, 2013 #3 of 13
    CeeWoo

    CeeWoo Godfather

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    I hadn't heard of that before, but it's kind of what I've been thinking - thanks
     
  4. Apr 7, 2013 #4 of 13
    gov

    gov Legend

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    I've seen just a few D* 3 LNBs heat sensitive, and of course there are the cold sensitive 5 LNBs. Hadn't encountered a DISH LNB of any stripe that was temp sensitive.

    LNB drift, cracked housings (and full of moisture) and just plain old dead, LOL.

    Appreciate the report, I need to keep an open attitude when troubleshooting.

    Thanx!
     
  5. Apr 7, 2013 #5 of 13
    P Smith

    P Smith Mr. FixAnything

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    you could try to cover LNBF(exclude plastic part, covering feedhorn) by aluminum foil
     
  6. Apr 7, 2013 #6 of 13
    VDP07

    VDP07 Godfather

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    Several summers ago, We had to replace many dozens of faulty DPP Twin lnbf's. IIRC there was a specific lot manufactured by Channel Master that suffered from heat failure. Took a couple of hot summers to get through all of them.
     
  7. Apr 7, 2013 #7 of 13
    puckwithahalo

    puckwithahalo Hall Of Fame

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    There was a bad batch of DP Twin lnb's about 6 or 7 years ago that caused some minor headaches with this, but it is a fairly isolated event these days
     
  8. Apr 7, 2013 #8 of 13
    CeeWoo

    CeeWoo Godfather

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    Wish I had the trailer at home instead of in storage. But I think this lnb could easily be in the 6-7 year old range...but I'd like to give it a good look over to see if there are any cracks. No big deal though, I see a used Legacy Twin Dual for only about $15 on ebay (buy it now) that I think will do the trick.

    Thanks for the input everyone!

    ==========

    Contacted the seller on ebay & he said that he also had new lnb at about $22. So I went with that instead
     
  9. Apr 8, 2013 #9 of 13
    puckwithahalo

    puckwithahalo Hall Of Fame

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    If its one from the faulty batch, if you run a switch test, the device will say CM DP TWin. :) And I was understating when I said minor, that was a lot of truck rolls
     
  10. boba

    boba Hall Of Fame

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    Between heat sensitive and LNB drift DISH has more LNB failures than it's competitors. I guess if you buy from the lowest bidder it will show up.
     
  11. gov

    gov Legend

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    LNB drift and stone cold dead are the 2 big ones I have seen. Not sure just what LNB drift is, but it must have been something apparent early on enough for code to be written for the box to diagnose it.

    Tough to know for sure (I haven't kept stats) but I'd suspect I have seen more Dish dishes smashed by 4 wheelers, tree limbs, weather and critters than Direct. Not sure why that would be, I do %wise quite a bit more D* work overall, but I'd say I've still seen more E* installs fall victim to accidents than D*.

    The current cold temp LNB situation hasn't been fun (have one at MY house!), but the OPs warm E* LNB is something to think about.

    Do we know if the high temp sensitivity 'registers' as LNB drift ?
     
  12. P Smith

    P Smith Mr. FixAnything

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    if the heat will cause LNBF drift, then yes
    it could just bring IC to knee with all sort of symptoms as low output, etc
    get spectrum analyzer, make snapshot before the heat and after, to see the drift visually
     
  13. CeeWoo

    CeeWoo Godfather

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    Dec 1, 2008
    Just a little update...I went camping again Wednesday and set up my system. I looked over the LNB and YES there was a crack about 2 inches long running down one side of the 'case'. Setup system as usual...no problem. Sig strengths were low, but usable

    Next day, my wife joined me and the new LNB I had ordered had been delivered. I installed it that day and my signal strengths increased by (I'm guessing) 20-25%. So I'm again a happy camper
     

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