My TivoHD Pixelation Story + 9.1 with Verizon FiOS in NoVA

Discussion in 'TiVo Series3 HDTV DVRs' started by edrock200, Oct 9, 2007.

  1. SCSIRAID

    SCSIRAID Active Member

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    Feb 2, 2003
    Vero Beach, FL

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    Excellent!!! This is surely a strange problem. It will be interesting to find what is actually at the root of it.

    If you cascade two two way splitters that will result in approx 7-7.5db of attenuation. Cascading splitters leaves open outputs which really should be terminated to minimize signal leakage and potential interference. However, it should work ok for testing.

    Instead of a bunch of 6db's you might want to get 3db's and get a bit better fine tuning capability.
     
  2. SCSIRAID

    SCSIRAID Active Member

    2,339
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    Feb 2, 2003
    Vero Beach, FL
    What signal strength are you seeing with the attenuation in place and 31 SNR? What frequency is the tuner tuned to?
     
  3. aaronwt

    aaronwt UHD Addict

    23,534
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    Jan 31, 2002
    Northern...
    DID the tech check the signal level at every output? My tech used a tester to verify the signal across the spectrum of frequencies they use at each location. I have two TiVoHD boxes and one HD STB. He then was required to upload the data while he was still on the premises. I have no pixelation problems on my boxes. I'm in the Woodbridge area, what NOVA area are you in?

     
  4. edrock200

    edrock200 New Member

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    Feb 7, 2002
    Northern...
    Thanks for the info on the db loss. I'll buy a large pack of 3db's. I have 4 Tivo HD's so I'll need at least 8 of them.

    I'll have to go and double check what frequency...it is one of the unencrypted channels however (locals) QAM I believe? Not sure, I'll check and report back, but the reason I tuned to this channel (ABC HD) is because it was the channel giving me the most grief.

    Signal strength is right around 60. With only one splitter its right between 85-90, but I haven't tested the "one-splitter" long enough to verify stability since the two splitter route works fine. 95% of what I record is off of freebie locals in HD so those are the channels I'm primarily concerned with. Prior to this fix I was considering just distributing my OTA to all the rooms.
     
  5. edrock200

    edrock200 New Member

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    Feb 7, 2002
    Northern...

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    Yes, I'm almost certain he did. And he was extremely knowledgable on the system. I was very impressed with the installer.

    The funny thing is the Tivo shows a signal of 100% at SNR of ~34/36. It's almost as if either the signal is too hot, or the Tivo has trouble dealing with such a strong signal and FiOS' motorolla boxes seem to handle this much better. In fact, the tech told me that in many of the installs he does he MUST install an 8 way splitter off the box regardless of the size of the job otherwise the signal is too hot. He could have been BS'ing me but seeing that he was pretty smart about the system I don't see why he would make that up.
     
  6. AbMagFab

    AbMagFab What happened, TiVo?

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    Feb 5, 2001
    You might also try attenuating the source, just before the splitter. I haven't tried that yet, but it might be easier than attenuating all the end-points.

    Again, I've only attenuated at each device, and maybe this is needed (like it's slowing down the water coming out of the hose), but I'd try both.

    I've got a bunch of in-line attenuators coming this week, so I'm going to try a bunch of things, including the effect on my S3's. Also, all of my devices have different SNR's and signal strengths, so each needs a slightly different attenuation to get to the same end SNR.

    I ordered a couple of -10db, and a bunch of -6db and -3db. Should give me enough to play with.

    I'll post back here with my results later in the week - both how the S3's react to lower SNR, and whether it's better at the source (pre-house-splitter) or at each device.
     
  7. aaronwt

    aaronwt UHD Addict

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    Jan 31, 2002
    Northern...
    The boxes will definitely have a problem if the signal is too hot. They put an 8 way splitter on mine also. He said he didn't want too hot a signal since it can damage some components.
    If you don't have an attenuator(you can pick up a variable one from radio shack). You can just add another splitter to get the signal level down 3.5 db to see if that helps although the variable attenuator is easiest.
    I had to use the variable attenuator when I had my TiVoHD connected to Comcast. Once I decreased the signal some I didn't have any problems with it. It's been perfect with FIOS.
     
  8. edrock200

    edrock200 New Member

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    Feb 7, 2002
    Northern...
    Quick update:

    It's been a while now with no drop outs since attenuating the signal. I went ahead and ordered a 10 pack of 6db attenuators for the rest of my Tivo's. For my situation, the problem appears to be resolved.
     

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