[mythtv-users] Fail to tune channels in UK using Rowridgetransmitter

David Watkins watkinshome at gmail.com
Mon Jan 9 09:05:29 UTC 2006


On 08/01/06, Myth TV <mythtv at fsmail.net> wrote:
>
> ========================================
>  Message Received: Jan 08 2006, 11:00 AM
>  From: "Steve Daniels" <steve.p.daniels at googlemail.com>
>  To: "Discussion about mythtv" <mythtv-users at mythtv.org>
>  Cc:
>  Subject: Re: [mythtv-users] Fail to tune channels in UK using  Rowridgetransmitter
>
>  ----- Original Message -----
>  From: "Myth TV" <mythtv at fsmail.net>
>  To: "mythtv-users" <mythtv-users at mythtv.org>
>  Sent: Sunday, January 08, 2006 9:33 AM
>  Subject: [mythtv-users] Fail to tune channels in UK using
>  Rowridgetransmitter
>
>  >
>  > However I am unable to tune it to any channel at all.
>  >
>  > I have checked the card and reception using the dvb-utils and dvbstream.
>  >
>  > I have managed to get all 85 Freeview channels information using the
>  > command :-
>  >
>  > # scan -u /usr/share/doc/dvb-utils/examples/scan/dvb-t/uk-Rowridge
>  >  >.tzap/channels.conf
>  >
>  > and example of the BBC1 channel information I got is in the attached file.
>  >
>  > I am then able to use the following commands to watch BBC1 channel using
>  > the dvbstream :-
>  >
>  > # tzap -r "BBC ONE"
>  >
>  > # dvbstream -o -ps 600 601 -qam 16 -cr 3_4 | xine stdin://mpeg2
>  >
>  > When trying to tune to BBC1 using the frequency tested under tzap/dvbsteam
>  > of 489833330 I still get nothing.  I get the same if I try to use the Full
>  > Scan option.
>  >
>  > Can someone please help me with the tuning of my card.
>  >
>  >
>  I assume your running the latest *stable* mythtv. When you say "When trying
>  to tune to BBC1 using the frequency tested under tzap/dvbsteam of 489833330
>  I still get nothing" Where did you put this frequency? From looking at your
>  attachments, if you didn't do so already you want to create a new transport
>  with the following details:
>  Standard:     DVB
>  Frequency:   489833330
>  Bandwidth:   8 MHz
>  Inversion:      Auto
>  Constellation: QAM 16
>  LP Coderate: Auto (I never bothered figuring out which was which out of
>  these two so just left em at auto)
>  HP Coderate: Auto
>  Trans. Mode: 2K
>  Gaurd Interval: 1/32
>  Hierachy: None
>
>  YMMV
>
>  But I had to set up ALL of my 6 transports for WinterHill manually. The
>  above will only give you BBC channels if the scan works.
>
>  HTH
>
>  Steve
>
>
> [ (no name for attachment) (0.2 Kb) ]
>
>
> Steve,
>
> Thanks for the pointers.
>
> I was using the default 'auto' for the other parameters apart from the frequency setting.  Now reset all according to the channels.conf generated from the tzap I am able to see that scanning for all channels does return all the desired channels.
>
> However I am still not able to watch tv.
>
> The front end reported that it took long to be allowed to read ...
> whilst the backend log reported that it could not find tuning parameters for transport 0.
>
> In my mythtv-setup I did not have a transport 0
>
> I have set up transport for each of the frequency deleted in my channels.conf.  e.g.
> 489833330
> 513833330
> 530167000
> 545833330
> 562166670
> 570166670
>
> Please see attached files showing the frontend and backend outputs.
>
> Is there something else I should be setting that I am not aware of ?

I've seen that No PIDS set message from time to time when I've been
fiddling with my channel setup. I think it's related to the starting
channel - ie the channel that mythtv initially tunes to.  As I
understand, if this channel is incorrectly setup, or not broadcasting
at the time, then mythtv fails rather ungraciously.  You can fiddle
around with the starting channel using the channel editor but I've
never been very successful with making this work - for some reason the
change doesn't alway stick.

My advice would be to delete all your channels (by letting mythtvsetup
remove them as it starts) and redoing the auto scan.

BTW you can get the exact parameters for your transmitter for the
autoscan from the channels.conf file the tzap produced just look
across the row for BBC1.  I only had to do a single scan for the
Crystal Palace transmitter, to get all available channels, and More4
and ITV4 added themselves automatically,without scanning, when they
came online.  YMMV.

Hope this helps.


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