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

John P Poet jppoet at gmail.com
Sun Nov 5 03:07:16 UTC 2006


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


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