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PLEASE RESPOND: OTA channels incorrect mapping / switching

Discussion in 'Other HD Receiver Support Forum (811, 921, 942)' started by Mark Lamutt, May 26, 2004.

  1. Mark Lamutt

    Mark Lamutt Your Neighborhood Liasion

    12,527
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    Mar 23, 2002
    Thanks for the info everyone. I think that the majority of cases proves my theory, and it will now be reported.
     
  2. wfhuber

    wfhuber Cool Member/Supporter

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    Oct 6, 2002
    Mark and all. Not sure if this is the same concern but I cannot receive local digital channel 5 (cbs). It's transmitted on channel 47 and shows a signal strength of 113 but cannot be saved and won't show up in the guide. It worked fine untill about a week ago. All other digital channels work fine.
    I have deleted it and tried to reenter it manually(as channel 47 and it shows in the guide but is only a black screen with no audio) but although it shows a strong signal it won't "save". Thanks-Bill
     
  3. Jason

    Jason Legend

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    Aug 8, 2002
    I also have this problem on my local WB station. My analog WB is channel 20. The HD WB channel is 21-1. However, when I scan for channels only 20-1 comes up. When I manually try to add 21-1 it shows a strong signal, yet it won't save and show up in the guide. Is there anyway to manually record this channel? I believe it has to be shown in the guide, otherwise I cannot set up a manual timer. Any fix for this?
     
  4. deweybrunner

    deweybrunner Legend

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    Feb 8, 2004
    Jason, the on.y place locals can be put in guide is in all channels, and sub's. This is where they should show up. If you want to record one you must go to "timers'.Create" then shift over to channels. I key in "9999" which takes me next to locals. Scroll to the station you want, click, set times etc. Hopefully we will again be able to add locals to our favorite list, then all will be easier. To get to the local channels I just key in the actual number of the station(not hd Number) ie channel 13 might be 13-1however I key in 013 to find the station. CBS is channel 10, however the hd number is 24-1. I key in, to find the station, 010. etc. Hopefully all will be better this month.
     
  5. Jason

    Jason Legend

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    Aug 8, 2002
    My problem is that when I key in 020, it comes up with 20-1 which is believe is a WB digital channel, however it is not in HD. I need to find some way to get to 21-1 which is the WB HD channel in my area. Any other thoughts?
     
  6. Slordak

    Slordak Hall Of Fame

    1,476
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    Dec 17, 2003
    I don't think you understand the "channel re-mapping" which takes place. Most digital channels get mapped to their analog equivalents. When you do a scan for digital channels, and the 921 finds a live digital channel, it looks at the signal to determine the channel name, mapping, etc. Then it adds it to your list of channels using the mapped number. In your case, this causes 21 to be added as 20-1.

    When you tune channel 20-1, you are actually watching channel 21. Hence, you're already tuned to the channel you want to be tuned to. Whether or not they are actually showing HD content is a different issue. Most channels don't show HD programming except during prime time.
     
  7. jsanders

    jsanders Hall Of Fame

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    Jan 21, 2004
    If channel 20 is WB digital, then there would be no channel 21 for WB-HD. There can be a 020-1, 020-2, 020-3, etc.. My local PBS station has five sub channels right now! Are you sure you are watching WB when they are showing an HD program in your area??

    You can hit the browse button on your remote (button to the right of the select button). This brings up the channel banner. You can scroll up and down, and go through the sub channels.
     
  8. Jason

    Jason Legend

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    Aug 8, 2002
    Is this a bug in the 921 causing it to mislabel OTA channels or is it supposed to rename the channels to the analog equivalents? If this is a bug, is it something that is going to be fixed?

    If a program on one of these OTA digital channels is not in HD, what is it broadcast in? The picture still looks better than DVD quality to me. Is a digital channel broadcast in 480p and then upconverted to 1080i if I have my 921 set to that?
     
  9. Mark Lamutt

    Mark Lamutt Your Neighborhood Liasion

    12,527
    1
    Mar 23, 2002
    The PSIP remapping is normal operation, not a bug. It's how the local station is choosing to broadcast.

    If the program being broadcast is not in HD, then it is being upconverted from the SD feed. So, the transmission is 1080i or 720p, but the program is not.

    If the program is broadcast in 480p, and you have your 921 set to output 1080i, then the 480p program is upconverted to 1080i by the 921.
     
  10. Jason

    Jason Legend

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    Aug 8, 2002
    Are the OTA digital channels broadcasting in SD (480i) if a particular show is not broadcast in HD? I thought that the OTA digital channels were at least 480p.

    The reason I assume this is because all OTA channels look 500% better than SD channels off the satellite. Some OTA that is not HD even looks as good as upconverted HD being shown on channels in the HD pack such as TNT-HD.
     
  11. Mark Lamutt

    Mark Lamutt Your Neighborhood Liasion

    12,527
    1
    Mar 23, 2002
    There are some OTA digital stations broadcasting 480i. The new standard (ATSC) provides for digital transmission, not HD transmission. 480i is part of the standard, and is an acceptable format under the standard.

    That's exactly what I'm saying - non-HD OTA is being upconverted by the station and broadcast at whatever resolution they broadcast at, just like non-HD is upconverted by TNT for broadcast on their TNT-HD channel.
     

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