No Signal on 99cb, 103cb

Discussion in 'DIRECTV Tips and Resources' started by MA Shestock, Mar 23, 2017.

  1. MA Shestock

    MA Shestock New Member

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    Mar 23, 2017
    On a commercial install and no matter what we do (Power Inserter, Trunk Amp, LNB change, SWiM 32 change, etc) We cannot acquire any 99CB or 103CB signal... All other signals are peaked on 101, 110, 119, 99CA, 103CA... DIRECTV Tech is stumped as is all others we speak with... Anyone see this before...
     
  2. slice1900

    slice1900 Well-Known Member

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    Is it possible there are diplexers in line somewhere on the trunk lines? Something must be blocking the lower frequency range.

    Is it feasible to temporarily run one coax from the dish to the closet where you have this equipment via another route (even just hanging down the wall outside the building and going through a window) just so you can verify that the problem is somehow related to the trunk lines? Or set up a temporary dish in another location to perform a similar test to your equipment.
     
  3. inkahauts

    inkahauts Well-Known Member

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    I was just going to ask, can you confirm that you don't get those signals on a coax that goes just from the dish to a box right next to it a few feet away? That will tell you to look for something in line as Slice suggests.
     
  4. inkahauts

    inkahauts Well-Known Member

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    Well one other big question, what receivers and did you force a firmware update on them yet? Sometimes they need that before they get all signals. And there aren't bbcs anywhere are there?
     
  5. MA Shestock

    MA Shestock New Member

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    Mar 23, 2017
    This was converted to SWiM from Oval 3 (Gain master Dish) with four lines coming down and all worked with Zinwell Switches... Plus all lines toned out... They are home runs to the dish
     
  6. inkahauts

    inkahauts Well-Known Member

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    Bbcs on the receivers? And did you rerun satellite setup? May need to do that a couple times. We've seen times when boxes have an issue taking that change the first time. And again, are they on the latest firmware?
     
  7. slice1900

    slice1900 Well-Known Member

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    Toning the lines only proves there is electrical connectivity, it doesn't sweep all the frequencies to see what passes and what doesn't, so it doing that didn't tell you anything you didn't already know when you got signal on 101/99ca/103ca.

    Those pre-HD dishes only used 950-2150 MHz, so using a diplexer to carry OTA was not uncommon. Is there an OTA antenna on the roof now, or signs of where there used to be one? Maybe there's a hidden junction box somewhere on the roof, or accessible from the floor immediately below where OTA was diplexed in from the coax connected to the antenna to those four coaxes. It would be diplexed in on all four, to insure that whatever polarity a legacy receiver selected it would also carry OTA to be diplexed off in the apartment.

    I assume that you've already done inkahauts test and verified 99cb and 103cb come in OK when plugging directly at the dish, but don't come in when you plug in directly before any amps / etc. in your closet?

    If so, something must be inline that's causing this, because you simply can't have a flaw in the coax causing something like that on all four outputs. Only other thing aside from diplexers that would do this are high pass filters (not sure why they would be there) or a slope compensator that drops the low frequencies too far down for recovery (though it would make no sense to have that anywhere but in the closet with everything else, unless there used to be a wiring closet in a different location and that wasn't removed because its passive)

    Are you absolutely sure those are home runs from the dish? How far is the wiring closet with that gear from the dish? I'd try to figure out where they come down through the roof, and trace them on every floor down to your wiring closet. Hopefully they aren't walled up, but are visible on each floor. If so, visually verify those four coaxes or the conduit they are carried in from the ceiling in the floor below the roof where they enter the building all the way down to the floor with the wiring closet without interruption.

    Do you have a meter for OTA by any chance? If so bring a portable antenna to the roof, connect it to one of the coaxes from the dish, and hook the meter to the other end in the closet. If you can pick up strong channels on the roof, but get nothing in the closet, that's further proof something is inline that's killing frequencies below 900 MHz.
     
  8. peds48

    peds48 Genius.

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    You have to start from the beginning. Put a meter or a receiver from the lines coming down the dish into the distribution closet, then move down to the outout of the next equipment then see where you are losing the b band.


    Sent from my iPad using Tapatalk
     

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