[linux-dvb] Testing a DVB Card

hugo hugo at aardvarks-and-platypus.com
Tue Dec 13 17:44:16 CET 2005


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.

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.


Thanks again for any help.

Hugo



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