[mythtv] Ticket #1049: DVBSignalMonitor needs to be able to monitor NIT/SDT

Mark Buechler mark.buechler at gmail.com
Wed Jun 7 02:44:49 UTC 2006


I would agree with you. From my experience, either the Linux DVB drivers or
the hardware itself attempts to tune in increments + or - the requested
frequency in order to get a lock, many times going too far and hitting
adjacent frequencies. Because of this I had to come up with this hack to
even get >20% tuning out of any card I used besides my Nexus. That's the
reason why I own so many cards. I started with the Nexus and had a difficult
time getting HD which prompted me to move to a budget card. From there I
tried several different budget cards trying desperately to find one which
tuned as well as the Nexus. The ONLY way I could find reliable tuning is
with this hack. Believe me, over a period of a couple months I tried
everything.

- Mark.

On 6/6/06, Yeasah Pell <yeasah at schwide.com> wrote:
>
> (see bottom)
>
> Mark Buechler wrote:
>
> > I would highly disagree with you here. From my experience, many cards
> > tend to wander too far when tuning takes too long (especially when
> > using a rotor). Often times the DVB card will lock onto a nearby
> > frequency and never lock onto the requested one. Retuning the card is
> > the only way to fix this. The only card I've found to NOT need this is
> > the Nexus-S. I've tested the SkyStar2, Twinhan 102G, Twinhan 1020a,
> > Nexus-S and the Genpix 8psk.
> >
> > - Mark.
> >
> > On 6/6/06, *MythTV* <mythtv at cvs.mythtv.org
> > <mailto:mythtv at cvs.mythtv.org>> wrote:
> >
> >     #1049: DVBSignalMonitor needs to be able to monitor NIT/SDT
> >
> -------------------------------------+--------------------------------------
> >     Reporter:  Mark.Buechler at gmail.com
> >     <mailto:Mark.Buechler at gmail.com>   |        Owner:  danielk
> >          Type:  enhancement              |       Status:  closed
> >     Priority:  minor                    |    Milestone:  0.20
> >     Component:  dvb                      |      Version:  head
> >     Severity:  low                      |   Resolution:  fixed
> >
> -------------------------------------+--------------------------------------
> >     Comment (by danielk):
> >
> >     (In [10132]) Refs #1552. Refs #1049. Removes DVB retuning hack
> >     from SVN
> >     head.
> >
> >     This should no longer be needed now that #1049 has been fixed.
> >
> >     --
> >     Ticket URL: <http://cvs.mythtv.org/trac/ticket/1049>
> >     MythTV <http://www.mythtv.org/>
> >     MythTV
> >
> When the diseqc stuff I'm working on is ready (it's getting close), that
> will help with the rotor issue, since the code will know approximately
> when the rotor is done rotating, and can issue another tune request at
> that point. I think that's a better way to handle the need for
> subsequent tuning commands than the retuning hack.
>
> There may be other reasons to do retuning besides rotors though -- for
> example, the retuning code itself talked about some buggy DVB-C hardware.
>
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