[linux-dvb] Re: Evil transmitters: a gotcha with the scan program(but not it's fault)

[Simeon Walker <simeon@sbs.bangor.ac.uk>]

Sounds familiar!

When I tried using scan something about the Wenvoe transmitter passed
by followed by a whole string of failed tuning attempts.

I couldn't figure out what was going on until I looked at a map and 
found out
where Wenvoe is. I'm in North Wales and Wenvoe is near Cardiff!

Pretty hopeless of whoever is supposed to be looking after these 
transmitters.
If anyone in the UK knows who to complain to then please let us know!

Sim

On 08/05/03 16:59, Jim Darby wrote:

> Well, I just purchased a Nova-T card and, after installing a new aerial,
> it all seems to be working fine.
>
> Which is more than can be said for Sudbury transmitter. After talking
> with the aerial installer who had been surprised that the Sudbury
> transmitter referred to itself as Tacolneston the Strange Behaviour all
> made sense.
>
> I haven't read the DVB specs down to the last bit, but I'm guessing that
> every multiplex not only provides an index of what it sends but also an
> index of other multiplexes that are available. Great, this makes a lot
> of sense and means you only have to find one multiplex and scan
> discovers all the others for you.
>
> Unless you live in Ipswich.
>
> In which case the local transmitter (Sudbury) carries what must be a
> bit-for-bit copy of the other local transmitter (Tacolneston) except, of
> course, on different frequencies.
>
> End result? You add one of the Sudbury multiplex frequencies to
> initial.h, run scan, it produces details of that multiplexes channels
> but on the wrong frequencies (well, right for Tacolneston) then goes
> wondering of on a wild goose chase looking at the wrong set of
> frequencies (for Sudbury, right for Tacolneston).
>
> Being a DVB newbie this had taken me most of the evening to figure out.
>
> By the way, the scan program also seems to occasionally produce the
> wrong apid for some channels. Its sometimes one too high. So, for
> example, it claims BBC 1 is uses vpid 600 (correct) and apid 602 (wrong,
> it should be 601).
>
> All this from linuxtv-dvb-1.0.0-pre2.
>
> Jim.
>
>
>
>  
--
Simeon Walker,                      email: simeon@sbs.bangor.ac.uk
School of Biological Sciences,      phone: +44 (0)1248 383702
University of Wales, Bangor,        fax: +44 (0)1248 382569
Gwynedd, LL57 2UW, UK.              www: http://biology.bangor.ac.uk/




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