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

[Martin Stubbs <martin@mstubbs.co.uk>]

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.
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.

Martin 


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