[linux-dvb] Re: Reception performance with Avermedia DVB-T

[rob <rob@phoenix.merseine.nu>]

Hi,

I was attempting the same modification, so I'm glad you have it working.

Well done for finding the firmware on the aver CD! (I had a look about but 
didn't manage to identify it.)

I haven't recieved a reply from aver yet. Are you considering building the i2c 
sniffer? if not I would be willing to build one and post the data I collect.

I can easily handle building the device, the only question is, where do I 
connect it to monitor the activity on the dvb-t card? ;)

thanks,

rob

On Tuesday 18 November 2003 9:07 pm, Holger Waechtler wrote:
> Martin Stubbs wrote:
> > Holger
> >
> >>>>I have my Avermedia DVB-T card working successfuly with Mythtv but I am
> >>>>finding that the reception performance is poor when I compare it to the
> >>>>performance under Windows.
> >>>>
> >>>>When I use tzap I get the FE_HAS_LOCK message maybe 50% of the time on
> >>>>the best Mux. Scan will only identify the channels on the worst Mux
> >>>>occassionally.
> >>>
> >>>We have similiar problems with the MT7072 frontend on the fx2 USB board.
> >>>Either the driver is not yet optimal or the frontend has some serious
> >>>problems -- can you please try the Windows driver and report whether
> >>>this is working better? If so we should maybe exchange the firmware or
> >>>try to find out what the Avermedia people are doing differently in their
> >>>driver.
> >>
> >>I can confirm that the card performs much better using the latest
> >> Avermedia driver under Windows than it does with the linux sp887x
> >> driver.
> >>
> >>Martin
> >
> > Over the last couple od days I have modified the sp887x driver to read a
> > firmware file using the tda1004 as a model. I have used the firmware file
> > that is part of the latest Aver Windows software and I can report that
> > the performance is significantly better. I can now receive all muxs and
> > tzap reports a solid lock.
>
> can you please report the changes you made and provide a patch? We'll be
> happy to apply it to CVS.
>
> > However the picture quality is still not perfect with some of the
> > channels severely broken up and the best channels having break ups every
> > few seconds. So it looks like other settings need to be changed. If we
> > can't get anything from Avermedia it looks like an i2c probe will be the
> > only answer.
>
> yes, especially since wiring the simple milksop i2c sniffer takes
> probably even less time and efforts than trying to get in contact with
> the avermedia guys...
>
> :)
>
> Holger



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