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SWM signal levels

Discussion in 'DIRECTV Installation/MDU Discussion' started by fluffybear, May 9, 2012.

  1. fluffybear

    fluffybear Hall Of Fame DBSTalk Club

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    Peachtree...
    I was just speaking with my Dad who said he has been having a couple of issues with an HR23 (unexplained 771B).

    his set-up: SL3 (3 lnb dish) connected to a SWM-8 (4-wires from dish to SWM)with an HR23-700 and HR22-100.
    NO OTA, NO DECA
    Output 1 connected to the PI and then the HR23
    Output 2 connected to the HR22

    One of the first things I had him do was to check his signal levels. All the levels are fantastic (matter of fact, I wish mine were as good) but when we got to the SWM mode, He mentioned that #8 was a zero. I had him go into the other room and check the levels there and again everything was great except he had a zero on #4 (#8 was 100).

    I have currently suggested using one of the green 2 way splitters I sent home with him during his last visit and connect both receivers to the same output and terminate the PI ad see if that fixes this odd 771B error.

    I am not seeing this type of behavior on my system with SWM-16's so my question here is if this is normal behavior or if signs of a failing SWM. I called DirecTV and spoke to a tech on his behalf and there only solution was to reauthorize the system and set-up a service call.

    FYI, his system has been working perfectly for at least 2 years without a problem. The only change he made was replacing a SD receiver with the HR23 just before Christmas..
     
  2. veryoldschool

    veryoldschool Lifetime Achiever Staff Member Super Moderator DBSTalk Club

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    What you're seeing on the SWM screen and the zero(s) are the channels in use by the other receiver(s).
    You'd need to have every receiver on the setup/SAT screens to free up the channels and not read zeros.
     
  3. fluffybear

    fluffybear Hall Of Fame DBSTalk Club

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    Peachtree...
    in other words, it's OK to see zeros on this screen ;)
     
  4. veryoldschool

    veryoldschool Lifetime Achiever Staff Member Super Moderator DBSTalk Club

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    While I will go so far as to say they're "normal", "OK" would only come after all the receivers were put on the same screen and there were no zeros shown, as a "sanity check".
     
  5. fluffybear

    fluffybear Hall Of Fame DBSTalk Club

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    Peachtree...
    I'll have him try that and see what happens.

    Thank You
     
  6. dielray

    dielray Legend

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    Aug 5, 2009
    771B usually means the SWM is over subscribed. With only 2 HD/DVRs connected, it is not normal to see 0s past channel 5. Does he live in a location where someone could have piggybacked off his switch?
     
  7. fluffybear

    fluffybear Hall Of Fame DBSTalk Club

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    Peachtree...
    He lives in a single family residence in a retirement community (individual homes spaced extremely close together and all with faux grass (rock painted green)). the homes on each side of him are family (mom's sisters) so I would have to say chances are unlikely.

    I have heard that same thing many times but there was a time when I was getting 771B and the only thing on one of my SWM-16 was an HR34 and a H25. When all was said and done, the problem turned out to be a faulty splitter. Since he does not have whole-home, there was no splitters to rule out this time. ;)
     
  8. dielray

    dielray Legend

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    Aug 5, 2009
    771B actually means the receiver was able to get its first channel from the SWM, but was unable to get it's second(Or 3rd, 4th, or 5th in the case of an HR34). First thing to try is unplugging both receivers and the pi. Wait a few seconds. Plug in the PI and then each receiver one by one.

    It could also be a connector, cable, switch, IRD, etc. issue. If nothing can be found to fix and he ends up needing a service call, you can set the receiver to a single tuner to avoid the message while he waits.
     
  9. fleckrj

    fleckrj Icon

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    Sep 4, 2009
    Cary, NC
    Is it possible that the coax to the HR23 is connected to the wrong Sat Input? There are two Sat inputs, but only one is used if you have a SWM. What happens if you connect the coax to the other input?
     

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