[linux-dvb] Testing a DVB Card

Nick knowledgejunkie at gmail.com
Tue Dec 13 20:34:46 CET 2005


On 13/12/05, hugo <hugo at aardvarks-and-platypus.com> wrote:
> Hi
>
> Further to my previous enquiries about the Avermedia A771-B DVB-T PCI
> (mt352 chipped) card under linux. I took advice from Brice and tried
> stealing the tuning info from the MS Windows Avermedia software and using
> that in the channels.conf file, and I also tried setting all the fields to
> AUTO for the scan program - with the exception of the transponder code
> which doesn't appear to want to go auto (guess you have to give the
> program a certain clue).
>
> Still no joy, nothing tunes and nothing locks on - although I'm a little
> suspicious about the tuning data from the Windows side - for instance it
> says BBC ONE is on *exactly* 610000 KHz (!)
>
> Anyway I appreciate there is obviously a huge hole in my understanding - I
> naively hoped I wouldn't need to understand much about the underlying
> broadcast technology of Digital Freeview, or any really nitty gritty stuff
> but obviously I do. However, I'm still a little suspicious of the setup -
> in that I don't really think the driver/linux is liking the card.
>
> Digital works differently from analogue (that I realise) - at least with
> an analogue card I could receive crap aka static so I would at least know
> that the drivers/applications were speaking to the card. I don't have that
> advantage with digital - OK perhaps if you're a DVB-guru you might know
> that:
>
> status 00 | signal a05f | snr 0000 | ber 00000000 | unc 00000000 |
> status 01 | signal e35f | snr 0000 | ber 00000000 | unc 00000000 |status
> 00 | signal a05f | snr 0000 | ber 00000000 | unc 00000000 |
> status 01 | signal e35f | snr 0000 | ber 00000000 | unc 00000000 |
>
> acually means something.
>
> My questions this time around are:
>
> 1) Does anyone have (a UK Centric) DVB-for-idiots type of guide, what
> transponder codes are, what multiplexed channels are.

This is a pretty good starting point for most of the information you'll need:

http://en.wikipedia.org/wiki/DVB
http://www.ethics-gradient.net/myth/mythdvb.html

You don't need to understand all the ins and outs of DVB to get it
running - essentially there are 6 multiplexes, each having a unique
frequency (which contain all of the actual channels) and it is these
six frequencies that you find in the DVB scan config files. As long as
these six numbers are correct for your location, you should be up and
running in no time.

> 2) Is there a basic simple program that will test a DVB Card. Nothing
> fancy, nothing that will try and tune or lock onto channels. Basically
> something nice and simple that will just go "Yup, I can see you card, I
> can see your tuner and I'm receiving rubbish and I can speak to stuff",
> basically so I know the card really is working.

I used Kaffeine the last time I set up a couple of DVB cards to make
sure they were functioning - a nice GUI, scans for channels, and you
can then watch and listen to them to make sure they're OK.

Nick



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