[mythtv-users] channel scan missing channels

Neil Cooper neilcoo at yahoo.co.uk
Tue Dec 14 21:14:26 UTC 2010

Yes I have experienced this same issue. I discovered that just doing another scan can pick up more channels that the first scan missed. My cable signal quality seems good and it really doesn't seem to be a hardware issue as and I've found this same problem exists on two differnet cards (a pcHDTV HD-3000 and a pcHDTV-HD5500). FYI I'm on Cox Cable which uses QAM-256.

PS. I'd like to say a massive "Thanks" to the developer that fixed the channel scan so that it now saves the actual channel number (like TV's use) instead of something that looks like a scrambled up random sequence number. That change alone saves me many hours when figuring out all the correct XMLTV IDs to type into each channel, whenever I have to do a new scan. (Now if only Schedules Direct could list which channel numbers Cox map all the digital stations to, and Cox could stop moving them around all the time....).

--- On Tue, 12/14/10, Michael T. Dean <mtdean at thirdcontact.com> wrote:

> From: Michael T. Dean <mtdean at thirdcontact.com>
> Subject: Re: [mythtv-users] channel scan missing channels
> To: "Discussion about MythTV" <mythtv-users at mythtv.org>
> Date: Tuesday, December 14, 2010, 1:06 PM
>  On 12/14/2010 01:50 PM, Steven Adeff
> wrote:
> >>>   On 12/13/2010 04:54 PM,
> Steven Adeff wrote:
> >>>> In doing a channel scan on my parents new
> mythbackend we've noticed
> >>>> that Myth isn't finding all the channels
> that we find using the
> >>>> digital tuner in their HDTV. I've done
> full scans of "Cable", "Cable
> >>>> IRC" and "Cable HRC" at QAM-64, 128 and
> 256. I just can't seem to get
> >>>> Myth to see the channels. I need to try to
> create the channel by hand
> >>>> to see if Myth can tune them, but I'm
> wondering if anyone else has run
> >>>> into this before?
> > anyone have any ideas? there's a few channel's Myth
> just won't find
> > that the digital tuners they have *do* find, and they
> are HD channels
> > so it would be nice if I could get Myth to tune them.
> Have you tried to see if any other application using the
> exact same hardware (the PC and the PC tuners) can find
> them?  Something like dvbscan?  http://www.mythtv.org/wiki/Dvbscan
> Could well be tuner sensitivity/interference, etc., so we
> need to prove that it's actually the software--meaning we
> need to see some other software that uses the same hardware
> find those channels.
> Mike
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