[linux-dvb] Re: Troubles with DVB-C

[Christophe Thommeret <hftom@free.fr>]

Le Jeudi 04 Novembre 2004 15:27, Philippe a écrit :
> > > By the way, here is my configuration :
> > >  - my official decoder works fine with no glitches and let me view all
> > > channels.
> > >
> > >  - DVB-C Full featured (ves1820)
> > >  - CPU via c3@1GHz
> > >  - 256Mo RAM
> >
> > You have DVB-C card (i.e., for cable) and you talk about
> > transponders! How is this related?
>
> Well, I think that for digital cable, each frequency carrying some channels
> is called a transponder.
>
> So it's why DVB-C and transponders are related.
>
> TP01 123.125 [ 7 channels] OK
> TP02 131.125 [ 9 channels] cannot lock (needs tune delay 2500)
> TP03 139.125 [ 6 channels] OK
> TP04 147.125 [ 8 channels] OK
> TP05 155.125 [12 channels] cannot lock (needs tune delay 800)
> TP06 163.125 [10 channels] OK
> TP07 195.125 [10 channels] OK
> TP08 211.125 [13 channels] cannot lock (needs tune delay 500)
> TP09 219.125 [ 7 channels] OK
> TP10 227.125 [ 7 channels] OK
> TP11 235.125 [ 6 channels] OK
> TP12 243.125 [ 5 channels] OK
> TP13 251.125 [10 channels] OK
> TP14 259.125 [10 channels] OK
> TP15 267.125 [54 channels] OK
> TP16 275.125 [ 8 channels] OK
> TP17 283.125 [ 4 channels] OK
> TP18 291.125 [ 2 channels] OK
> TP19 714.375 [10 channels] OK
> TP20 754.375 [ 9 channels] OK
> TP21 842.375 [ 4 channels] OK
>
> Total 211 channels on 21 frequencies (or multiplex or transponders, call it
> the way you want)
>
> With the latest dvb-kernel for kernel 2.4 I can tune to all transponders if
> I use the flag dvb_override_tune_delay=2500
>
> I tried to change the pwm value (ves1820 specific) but it seems that it
> does nothing, I always have :
> DVB: VES1820(0): AFC (-4) 26855Hz
>
> With the new delay (2500) forced, I can tune to every channel, but for the
> 3 transponders, I have a very high BER value which leads to some UNC
> errors. So the picture is sometimes really blocky.
>
> As I told you before, I do not understand why my official decoder works
> without any trouble...
>
> Cheers
>
> Philippe

Maybe you should check your cables / connectors

-- 
Christophe Thommeret