[mythtv-users] HD-5500 will not tune NTSC channels.

R. G. Newbury newbury at mandamus.org
Tue Apr 24 16:55:57 UTC 2007

Thomas Kessler wrote:
> What would the line in modprobe.conf look like for ivtv and cx8800?
> TK
> On 4/23/07, R. G. Newbury <newbury at mandamus.org> wrote:
>> Thomas Kessler wrote:
>> > On 4/22/07, R. G. Newbury <newbury at mandamus.org> wrote:
>> >>
>> >>
>> >> The post 12618 problem only affects scanning on the ATSC side of
>> things.
>> >> Your post was unclear: do you have TWO different zap2it channel
>> lineups?
>> >>
>> >> When you switch modes it is as if you swapped cards completely. So you
>> >> need a lineup distinct to NTSC channels. Your error message about 
>> wrong
>> >> modulation implies to me that you are trying to tune an NTSC channel,
>> >> using an ATSC-channel tuning method (because myth thinks it is dealing
>> >> with an ATSC channel). That fails, of course.
>> >>
>> >> If you HAVE defined 2 lineups, it sounds like your NTSC channel 
>> listing
>> >> has the same modulation value as the ATSC....
>> >>
>> >> For NTSC tuning, your card would not (properly) use the dtv_multiplex
>> >> table... which is the one place where modulation appears. (It 
>> should be
>> >> qam_256 for digital cable: in mysql:
>> >>
>> >> select modulation from dtv_multiplex;
>> >>
>> >> Geoff
>> >
>> >
>> > I was in mythtv-setup and I noticed that both my HD-5500 NTSC and
>> PVR-350
>> > were being assigned to /dev/video0. I know I can add something to
>> > /etc/modprobe.d/aliases to assign hardware to a specific devices. Does
>> > anyone know what I might put to fix this? Also when I originally 
>> went to
>> > get
>> > NTSC working I only had an analog listing in my zap2it account and I
>> only
>> > setup my HD-5500 card with one input going to the NTSC connection and
>> > nothing to the ATSC side of the card in setup.
>> >
>> > TK
>> Since the cx88 modules are loaded by the kernel very early in the boot
>> process, I have recommendeded that people blacklist all the cx88..
>> modules, so that they will not unexpectedly be loaded. (The kernel will
>> then recognize that the card is there, but not load the module).
>> We control the load by adding a single line to rc.local: 'modprobe
>> cx88_dvb'. Once installed, this will (should!) result in udev creating
>> the /dev/dvb tree for the ATSC side of the card..
>> Then your usual modprobe.conf need only contain the ivtv line for your
>> PVR. It will end up at /dev/video0..
>> Finally another line in modprobe.conf can load cx8800 for the NTSC side
>> of the HD5500. It will then be assigned to /dev/video1.
>> This process means that the PVR card never changes its assigned
>> position. The /dev/video1 and /dev/dvb/adaptor0 adapters will appear and
>> disappear as the controlling module is swapped.
>> And you will have to start with another lineup at labs.zap2it.com.

Please don't top-post. It makes following things difficult. And please edit.

For ivtv based tuners you need the first line, and one version of the 
second line where 'X' is '0' then '1' etc. for each successive tuner 
card. The respective cards will then show up at /dev/video0, /dev/video1 etc

alias char-major-81 videodev
alias char-major-81-X ivtv

I have never tried to get the NTSC side of my HD3000 working. Best I can 
suggest is putting the following in modprobe.conf after the foregoing lines:

alias char-major-141-1 cx8800

(Not even sure about that: you can try 'install cx8800' instead).
The pcHDTV website is not very helpful...Although there are LOTS of 
interesting posts..."Martha Stewart in anal action" sounds...disgusting!

Your best bet is to read the install docs which came with the pchdtv 
downloads. Read them very carefully. Sorry I cannot help on this exact 

              R. Geoffrey Newbury			
            Barrister and Solicitor
       Suite 106, 150 Lakeshore Road West
          Mississauga, Ontario, L5H 3R2

         o905-271-9600 f905-271-1638
           newbury at mandamus.org

        Helping with the HTTP issue
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