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FIOS TV pixellation fix - attenuate to SNR 31

Discussion in 'TiVo Series3 HDTV DVRs' started by AbMagFab, Nov 19, 2007.

  1. Dec 11, 2007 #21 of 866
    dgbretz

    dgbretz New Member

    17
    0
    Jun 19, 2007
    Does it make any sense to have pixelation without any RS Uncorrected Errors? I have seen pixelation and then checked the diagnostics and not seen any errors.

    I plan to try the attenuators to get to the 'right' SNR anyways but would like to understand why I don't see errors reported.
     
  2. Dec 11, 2007 #22 of 866
    litkaj

    litkaj Member

    257
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    Jun 5, 2007
    Exton, PA
    Yes, you do. It's not "theory" and it's certainly not FUD. The original problem is not moving; the new problem is occurring because certain channels are now too weak to tune properly. I know this can happen as it happened to me two months ago.

    I started getting some breakups and pixelation on 459MHz through 477MHz (digital versions of 1-49 and all of the Music Choice channels). When running a cable directly to the ONT didn't help I figured the signal might have been too strong.

    I broke out the collection of attenuators I had the install tech leave me when the CableCARDs were first "installed" and went to work. 459-477 cleared up with anywhere between 15-20dB of attenuation. However, at anything more than 17dB the channels in the low 700's started flaking out. I backed off to -16dB and now everything is fine.
     
  3. Dec 24, 2007 #23 of 866
    sflippen

    sflippen New Member

    6
    0
    Mar 1, 2003
    Newport...
    :up:
    I just began having severe pixelation problems three months after installation. I was not aware of this suggestion on the forum. I thought that based on a varying signal strength (TiVo-provided) from 70-90% and sometimes all the way to 0 (lost lock), I was looking at a bad cable or a problem with incoming signal. The VZ HD STB worked fine, which was mildly frustrating when reporting the problem.
    I insisted it was not a "TiVo" problem and requested a tech dispatch to check signal levels. She was proud to show me the results which were, "Excellent"!
    Fortunately, there was a video SME, Sean, at the VZ Hampton FSC that was aware of the issue and advised to install the attenuator. The problem is solved!
     
  4. Dec 26, 2007 #24 of 866
    vfrjim

    vfrjim New Member

    28
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    Dec 17, 2007
    Thanks for the fix, I had an adjustable Attenuator from Radio Shack hanging around, I attached it and adjusted it till it said 31 db(down from 38 db) and no more pixelization on my Tivo with Fios.
     
  5. Dec 27, 2007 #25 of 866
    richsadams

    richsadams Active Member

    8,893
    2
    Jan 4, 2003
    Thanks for the update and welcome to the forum. :up:

    I don't have any real macroblocking problems, but I have one of these and wondered if it is the same thing you're using JIC.

    [​IMG]
     
  6. Dec 27, 2007 #26 of 866
    vfrjim

    vfrjim New Member

    28
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    Dec 17, 2007
    looks like it but mine is black in color
     
  7. Dec 29, 2007 #27 of 866
    litkaj

    litkaj Member

    257
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    Jun 5, 2007
    Exton, PA
    I've been looking for one of those for a while. Anyone know where to get one? Radio Shack doesn't sell them any more.
     
  8. Dec 29, 2007 #28 of 866
    richsadams

    richsadams Active Member

    8,893
    2
    Jan 4, 2003
    When the OP mentioned the device it reminded me that I had something like it that I actually purchased years ago to address a red-push issue I had with a Mitsubishi RP TV I used to have. (It didn't really help.) For whatever reason I kept it in my box of electronic "stuff".

    I don't have FIOS :)mad:) but I do have a very strong signal (35db - 37db) from Comcast and get some macroblocking on a couple of HD channels (NBC in particular). I thought about attenuating the incoming signal to see if it would make any difference and vfrjim's post peaked my interest.

    I doubt that this little device will help much...it's pretty cheaply made and not very precise. I suspect that usng dedicated attenuators as others have suggested is the way to go but it might give me an indication if making some adjustments will work. I'll report back once I've given it a try.

    I thought that RS might still be selling them based on a similar post from a few months ago.
     
  9. Dec 29, 2007 #29 of 866
    bizzy

    bizzy New Member

    707
    0
    Jan 20, 2004
    San...
    Wow, I thought I was probably the last person in the world using a mitsu rptv :)

    Are you still waiting for your "Promise" Module? :)
     
  10. Dec 29, 2007 #30 of 866
    richsadams

    richsadams Active Member

    8,893
    2
    Jan 4, 2003
    Ha! Good one! I just wish I had kept it now...it was "HD Ready" after all. :rolleyes:
     
  11. Jan 3, 2008 #31 of 866
    threshar

    threshar New Member

    12
    0
    May 20, 2002
    Well, I tried this fix, but I don't think this is my problem.

    When I tune into say, PBS-HD the signal stays at 100 and SNR is pretty solid at 35-36db and I get no hiccups, pixelation, gray screens.

    However, when I tune into say, Showtime-HD the signal strength goes crazy - it jumps from 0-100 and the SNR jumps around accordingly, and I get lots of hiccups.

    Now, when this is happening, I can't tune into a channel in the same block - say StarzHD. But tuning into a local-hd channel works fine. signal goes back to sanity.

    I tried various levels of attenuation (Luckly my pal had a similar problem and had a bag of them so I just borrowed them) from 24db to 3. nothing helped. a bit of attentuation may have reduced it a bit, but it still was going crazy.

    Today for an experiment I'm going to move the tivo downstairs where the, oh lets call it, the virgin line comes in and see if it is the run verizon did from there to my livingroom. Still odd it mainly affects stations such as sho-hd. (I'd wager it has something to do with increased bandwidth usage).

    I also get gray screen syndrome on some regular (SD) channels as well, but it is intermitent. (When it tunes in, I just get a gray screen. I'd wager it is very much related to the signal strenth issue).

    and for the record, the line goes ont->40' outside->inside->splitter->tv1 and another 30' run to tv2. The tv1 has a -4 vz installed on it. the other has nothing. Verizon ran all the cables.

    well, here's to hoping I can solve it. Really annoying when I get gray screen syndrome or none of my movies record or are pixelated.
     
  12. Jan 3, 2008 #32 of 866
    richsadams

    richsadams Active Member

    8,893
    2
    Jan 4, 2003
    Sorry you're having troubles...it can be very frustrating. It may or may not be true in your case, but if you're getting a solid signal on some channels but not on others I'd call Verizon. It may have something to do with your setup or it could be a cable card issue...or it may (probably?) be something outside of your home.

    We went through the same thing a while back...some channels were perfect while others were a mess or didn't work at all. When we called the CSR had us tune to various channels and finally isolated which "block" was giving us problems. They did some work on their end (no truck roll or anything) and in about an hour everything was fine. They may have re-hit our cable cards or it mght have been something else. :confused:

    The CSR explained that channels are delivered within certain frequencies. The frequencies aren't necessarilly related to the channels themselves (i.e. Showtime and Starz may or may not be part of the same group). That's why some will work normally and others won't.

    Thanks for keeping us posted and let us know what you find out. :up:
     
  13. Jan 3, 2008 #33 of 866
    TexasAg

    TexasAg New Member

    648
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    Apr 2, 2006
    My pixelation was minor at the prior attenuation level, but I went ahead and added more attenuation to my S3. But, the SNR varies from station to station. If I get one down to 32, others will drop to 30. I finally put in enough to get most stations down around 31-33. The weird thing is that it drops the signal strength down into the 70s, but the S3 seems OK with it. I think I might be seeing a little less pixelation now.
     
  14. Jan 3, 2008 #34 of 866
    rifleman69

    rifleman69 Member

    853
    0
    Jan 6, 2005
    Oregon
    I've applied a 12 and a 6 so far, which drops the SR from 36-37 to 34-35. Either of the 12 and 6 reduces all uncorrected errors (and just about all of the corrected one's too) but every now and then I get a blip where the video freezes for about 2-3 seconds and then catches up. Having no attenuators makes both corrected and uncorrected shoot off into the hundreds of thousands very quickly.

    Probably put on another 10-12 just to make sure, most of the individual channels strengths are still just under 100 if not at 100.
     
  15. Jan 4, 2008 #35 of 866
    rifleman69

    rifleman69 Member

    853
    0
    Jan 6, 2005
    Oregon
    Now have 12 + 6 + 6 on and the SNR appears to fluctuate between 30 and 32. Couple of non-corrected errors on a non-HD channel (about 30 in the span of a couple of hours). Still noticed a little glitching on FOX HD last night during the football game.

    It's getting better but not 100% yet. Signal strength is definitely not an issue.
     
  16. Jan 5, 2008 #36 of 866
    Chris3G

    Chris3G New Member

    4
    0
    Sep 10, 2006
    am i correct in assuming that when you guys have a pixelation problem on a particular channel, it happens regardless of what is on the screen at the time? I've been noticing some macroblocking on my new TV with FIOS and Tivo HD, but it only happens during scenes with heavy motion. Is this inherent to the feed and not what you are all talking about here? My signal strength is locked at 100 and SNR is 36/37, but both RS corrected and uncorrected are always at 0.
     
  17. Jan 6, 2008 #37 of 866
    rifleman69

    rifleman69 Member

    853
    0
    Jan 6, 2005
    Oregon
    For me, it doesn't matter what's happening on the particular channel although there is some sort of movement going on (it's not Sunrise Earth)
     
  18. Jan 7, 2008 #38 of 866
    sesmith3

    sesmith3 New Member

    12
    0
    Feb 17, 2005
    Ahhhh the Mitsu Promise Module... "Promise" as in Mitsubishi promises to lighten your wallet for another $1000 as soon as you decide you can't live without an HD tuner..
     
  19. Jan 7, 2008 #39 of 866
    litkaj

    litkaj Member

    257
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    Jun 5, 2007
    Exton, PA
    If RS Uncorrected is at 0 then that is in the feed. Some of the channels, such as DiscoveryHD, aren't broadcast at quite as high a bitrate as others (such as HDNet).
     
  20. Jan 7, 2008 #40 of 866
    SGR215

    SGR215 New Member

    134
    0
    Jan 20, 2004
    I have an unusual issue. I'm noticing no pixelation so far however, I do notice at times "RS Uncorrected" will have 100+ when I first switch to a channel. It won't go any higher after it has tuned to the channel and I notice no issues in the feed whatsoever. Is this normal?

    The vast majority of the time "RS Uncorrected" stays at 0 along with "RS Corrected".(There are times RS Corrected jumps to 3000 though) My signal hovers between 35-37DB.

    Edit: Pixelation has arrived. Attenuators are on the way so hopefully it'll be fixed when they arrive. :)
     

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