[linux-dvb] Re: High BER's & Glitching with 2.6 kernel, better with 2.4 and 1.0.0-pre2 (Nova-T)

[Dave Smith <dave@nobodynet.net>]

On Monday 09 February 2004 12:12 am, Johannes Stezenbach wrote:
>
> Hm, that's interesting...
> If your feel up for some more experiments you could check whether
> the changed frequency offset (36125000 vs. 36000000) makes the
> difference, or the band/chargepump setting.
>

Sorry that it's taken me some time to do this.

Using release 1.0.1 and a 2.4.20 kernel, I have modified the 
tsa5060_set_tv_freq function in the  grundig_29504-401 frontend to match 
1.0.0.-pre2.

Changing the frequency offset from the -pre2 value of 36000000 to the 1.0.1 
value of 36125000 made no apparent difference.

In the -pre2 code, there are no values for cpump or band_select, meaning that 
buf[3] in that function is always set to 0xc0.  If I change this to 0x43 
(which I think would be the value when the frequency of the BBC mux from 
Crystal Palace is given) leads to the higher BER rates and many UNConcealed 
errors when tuned to a channel in the BBC mux.

I must admit that my understanding of C is pretty weak, and so I may have 
evaluated the cpump and band_select errors incorrectly.  However it does 
appear that the setting of buf[3] (whatever that does) is causing the errors 
on my card.

I hope this helps.

Cheers,

--Dave



-- 
Dave Smith
dave@nobodynet.net



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