[mythtv-users] HD Homerun won't lock on some QAM channels

[John P Poet]

On 11/4/06, John P Poet <jppoet at gmail.com> wrote:
> On 11/4/06, Daniel Kristjansson <danielk at cuymedia.net> wrote:
> > On Sat, 2006-11-04 at 19:40 -0700, John P Poet wrote:
> > > I am trying to put together a Myth box for my sister.  For HD, I
> > > decided to try one of the HDHR units.  Where she lives, OTA is SOL, so
> > > I have to use QAM.
> > >
> > > In testing the settup, I am having trouble getting Myth to tune two of
> > > the HD channels.  Three of the channels come in just fine.  The get a
> > > signal locked very quickly with LAMGV.  The two stations that will not
> > > lock, get LAmGV instead.
> > >
> > > If I start mythbackend with "-v siparser,channel", I get:
> > >
> > > Which indicates it thinks that channel is encrypted?  That channel is
> > > not encrypted.  My Samsung HDTV will tune and show it just fine (no
> > > cable card, or anything).
> >
> > It's probably not encrypted. It looks like the MGT table is either
> > broken or missing, if you zero out the atsc_major_chan and
> > atsc_minor_chan fields for this channel in the channel table in
> > the DB, you will probably be able to tune it. However you will no
> > longer get any EIT guide data for the channel. This is probably
> > something broken at the cable operator's head end. They are
> > required by law to keep this working, but sometimes scoff at
> > the idea, RCN in New York City comes to mind. It's also possible
> > that the broadcaster's system is broken; in New York, WABC hasn't
> > transmitted proper ATSC since 2001!
> >
> > -- Daniel
>
> Thanks for the quick response, Daniel.
>
> Tried what you suggested.  It did change the behavior, but did not fix
> it.  Now instead of getting "LAmGV", I just get "LAm".  The "GV" is
> gone.  I am pretty sure that both NBC-HD and ABC-HD are on the same
> major channel.
>
> 2006-11-04 19:05:47.115 SM(ffffffff/0)::AddFlags: Seen(VCT,CVCT,) Match() Wait()
> 2006-11-04 19:05:47.117 Could not find channel -1_-1 in CVCT
> 2006-11-04 19:05:47.118
> VCT Cable: channels(2) tsid(0x0) seclength(77)
> Channel #0 name(NBC HD) 4-1 mod(SCTE mode 2) cTSID(0x0)
>  pnum(1) ETM_loc(0) access_ctrl(0) hidden(0)
> path_select(0) out_of_band(0) hide_guide(1) service_type(2) source_id(2)
>
> Channel #1 name(ABC HD) 7-1 mod(SCTE mode 2) cTSID(0x0)
>  pnum(7) ETM_loc(0) access_ctrl(0) hidden(0)
> path_select(0) out_of_band(0) hide_guide(1) service_type(2) source_id(1)
>
>
> 2006-11-04 19:05:47.529 SM(ffffffff/0)::AddFlags: Seen(VCT,CVCT,) Match() Wait()
> 2006-11-04 19:05:47.531 Could not find channel -1_-1 in CVCT
> 2006-11-04 19:05:47.532
>
> John

I am able to tune all of those channels using the HDHR and VLC.

The problem channels are 4-1 and 7-1.  Turns out both of those
channels are on QAM "channel" 113.  If I use VLC to watch a stream
from the HDHR, after tuning it to qam256:113, VLC will happily shows
me what it sees as "programs" 1 and 7.

Any other idea?

Thanks,

John