1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

Intermittent tuner failure

Discussion in 'DIRECTV HD DVR/Receiver Discussion' started by peters4n6, Dec 24, 2010.

  1. Jan 4, 2011 #21 of 119
    veryoldschool

    veryoldschool Lifetime Achiever Staff Member Super Moderator DBSTalk Club

    42,684
    349
    Dec 9, 2006
    Since the SWiM needs to first do a course "tune" to select the transponder for the receiver to then fine tune for a channel, the 2.3 MHz FSK is what is used to communicate these commands.
    What I think you're seeing is a marginal signal. The 24 may have a higher/lower [depending on which end] threshold and the longer coax added to the lossy path through the diplexer(s) are all summing up to be giving you this problem.
    I haven't used the NAS diplexer so :shrug: , but if they have tweaked the DC path to pass the 2.3 MHz, it may work for you.
     
  2. Jan 5, 2011 #22 of 119
    peters4n6

    peters4n6 Legend

    273
    1
    Jun 19, 2007
    Since I have two runs of coax to each receiver location I am planning on running the OTA signal directly to each of my AM21 units to retain their functionality, but I need some splitters. Can I still use the green splitters even if I have MRV via ethernet? IOW, I know the green splitters are optimized for use with DECA; are there any contraindications for using them without DECA? Also, stupid question...can I run the new cable run directly to the AM-21, or must I use my old diplexer to "feed it what it needs" The former, no?
     
  3. Jan 5, 2011 #23 of 119
    veryoldschool

    veryoldschool Lifetime Achiever Staff Member Super Moderator DBSTalk Club

    42,684
    349
    Dec 9, 2006
    The green splitters will also work fine without DECA.
    If you're using a coax for your OTA and not anything else, why waste diplexers to do nothing for you?
     
  4. Jan 5, 2011 #24 of 119
    peters4n6

    peters4n6 Legend

    273
    1
    Jun 19, 2007
    That's what I thought. For some reason, in my head, I thought I needed to "isolate" the OTA signal from the SAT signal that is on that same line.
     
  5. Jan 5, 2011 #25 of 119
    veryoldschool

    veryoldschool Lifetime Achiever Staff Member Super Moderator DBSTalk Club

    42,684
    349
    Dec 9, 2006
    but, but ,but... there isn't going to be one, right? This is the unused coax right?
     
  6. Jan 5, 2011 #26 of 119
    peters4n6

    peters4n6 Legend

    273
    1
    Jun 19, 2007
    Wait a minute, to clarify, my OTA antenna is plugged into the OTA port on my SWM-8. It is not a direct run straight from the OTA antenna. That single wire comes directly to a central closet. From there the "unused coax run" (from the closet to the location of the AM21) will only be used for OTA.
     
  7. Jan 5, 2011 #27 of 119
    veryoldschool

    veryoldschool Lifetime Achiever Staff Member Super Moderator DBSTalk Club

    42,684
    349
    Dec 9, 2006
    OK, then things are a bit different.
    Either don't use the SWM8 OTA input, or use "the other coax" to feed your OTA tuner, but you'll need to diplex out and terminate the SAT port on the diplexer.
    This should still help your original problems as you've removed the diplexer from the SAT input to SWiM.
     
  8. Jan 5, 2011 #28 of 119
    peters4n6

    peters4n6 Legend

    273
    1
    Jun 19, 2007
    Agreed. And thank you.
     
  9. Jan 5, 2011 #29 of 119
    peters4n6

    peters4n6 Legend

    273
    1
    Jun 19, 2007
    Well it seems like the diplexer is not the problem. Again this evening got all zeros(cold?...never during the day...my daughter was home sick in my bed today watching tv all day) Rapidly checked all other boxes in the house...all fine. Checked signal strength bars and they are varying wildly...after five minutes picture back------> off to type this post :computer:

    >>>>>insert wife screaming from the other room, "It's doing it again"<<<<<<<

    Go back to TV and note the following:

    1-For a short period of time I have normal transponder readings for the SWM (and 100% on the strength meters) while zeros everywhere else.

    2-For a period of a couple of minutes I have zero signal strength on one tuner for the SWM and 100% on the other---then the first tuner kicks back in to 100%

    The only thing I haven't done (which I'm embarrassed to point out) is replace the coax line from the wall to the HR24. Just did that now :shrug: Strengths ok for now...

    :icon_dumm

    I don't know if i'm reading this wrong, but is this smelling like a flaky tuner again?

    My big concern about calling out a D* tech right now is that this only happens at night.
     
  10. Jan 6, 2011 #30 of 119
    veryoldschool

    veryoldschool Lifetime Achiever Staff Member Super Moderator DBSTalk Club

    42,684
    349
    Dec 9, 2006
    With two tuners varying and having a single coax feeding them, "the coax" shouldn't be the cause.
    Doing a quick review of this thread, you've had two DVRs to this at this location, right?
    If you have doubts about the receiver, can you swap it with another and run each at these locations to see if it's location or receiver that has this in common?
    Weirdness prevails, so you may need to start going way out for the cause.
    If location is it, then it might be AC related.
    The SWM8 could be an issue, but it shouldn't be in one location.
     
  11. Jan 6, 2011 #31 of 119
    peters4n6

    peters4n6 Legend

    273
    1
    Jun 19, 2007
    Yes, two DVRs at this location, a 3-year-old HR21 that had exactly the same problem that I swapped to a different location and duplicated the problem. My conclusion was that it was tuner failure. Tuner failure on that box started out symptomatically like my current box, but eventually I got zeros permanently after a couple of weeks.

    Box and TV are plugged into a power strip, I could plug the box into a different hole I guess...TV never has flaked out. Could it be something with the external HD enclosure's controller communicating something weird to the main box? I assume whatever is going wrong, if it is in the box, is hardware based and not some sort of firmware or esata issue.

    The obvious irony is that if it is tuner failure, I replaced a bad box with another bad box to the same location--sending me on this goose chase.

    Like I said earlier, I would call a tech out, but I have yet to have a problem other than between ~9-10 PM. I'm not an engineer (obviously), but I wonder if there's something a tech could do to "interrogate" the wiring to see if there are any problems(voltage issues, etc) even if it is not manifesting in a signal dropout at the time of the visit.

    Thanks again for your learned input.
     
  12. Jan 6, 2011 #32 of 119
    veryoldschool

    veryoldschool Lifetime Achiever Staff Member Super Moderator DBSTalk Club

    42,684
    349
    Dec 9, 2006
    Could two receivers have the same malfunction? It's not unheard of.
    With it happening more or less at a certain time of day/night, I can't completely rule out issues/problems coming from the AC power, as these have also been the source of similar problems.
    It would seem very strange for the external drive to have any affect, since it isn't "doing anything" during the SAT levels tests/checks.
     
  13. Jan 6, 2011 #33 of 119
    David MacLeod

    David MacLeod New Member

    5,689
    0
    Jan 29, 2008
    may have missed you removing all traces of ota, if so sorry.
    unplug ota from swm8. this is how I had it and had exact issues you do. you gotta remove ota and diplexers from the lines.

    mine worked for 2 years then suddenly stopped, and I also DID have hr21-100 units doing it too.
    so now I am swm8 to pi to splitter to dvrs.
    no ota, no diplexers, no issues.
    I DID have to run swm to pi too, using swm2 port for PI gave flaky signals. SEE EDIT

    edit: even having ota plugged into swm8 even if not used at dvr end caused issues. HAD to unplug ota from swm8 units.

    EDIT: clarify- had pi to swm1 and dvrs all off swm 2
     
  14. Jan 6, 2011 #34 of 119
    peters4n6

    peters4n6 Legend

    273
    1
    Jun 19, 2007
    Can try that. Thanks. WIth my fear of heights that could be fun. Not. :grrr:

    Not sure what you mean by that. Isn't one supposed to avoid the SWM2 port for the PI?
     
  15. Jan 6, 2011 #35 of 119
    peters4n6

    peters4n6 Legend

    273
    1
    Jun 19, 2007
    VOS,

    Humor me because I am not knowledgeable in these matters, and after having read many of your previous posts here and elsewhere, you clearly have great experience and scientific knowledge in these matters.

    Why would some sort of AC power issue possibly adequately explain why I would have, as I mentioned earlier, 100% signal strength on one tuner to the SWiM and zero on the other, but a bad run of coax from the wall to the box would not?
     
  16. Jan 6, 2011 #36 of 119
    veryoldschool

    veryoldschool Lifetime Achiever Staff Member Super Moderator DBSTalk Club

    42,684
    349
    Dec 9, 2006
    YES!
     
  17. Jan 6, 2011 #37 of 119
    David MacLeod

    David MacLeod New Member

    5,689
    0
    Jan 29, 2008
    I misstated it, had tried pi to swm1 and then run everything off swm2.
    point was (for mine) had to be swm to pi to dvr with NO ota at all.
     
  18. Jan 6, 2011 #38 of 119
    veryoldschool

    veryoldschool Lifetime Achiever Staff Member Super Moderator DBSTalk Club

    42,684
    349
    Dec 9, 2006
    The MDUs used the third legacy port to power them too.
     
  19. Jan 6, 2011 #39 of 119
    David MacLeod

    David MacLeod New Member

    5,689
    0
    Jan 29, 2008
    I had seen that and considered trying it but at that point it was working well so.... :lol: left it
     
  20. Jan 6, 2011 #40 of 119
    veryoldschool

    veryoldschool Lifetime Achiever Staff Member Super Moderator DBSTalk Club

    42,684
    349
    Dec 9, 2006
    It's one way to not have 15' of coax coiled up when you have the PI next to/near the SWM8.
     

Share This Page