Symbol rate limit for TT 3200

Symbol rate limit for TT 3200

[Manu]

	Hi all,
I have been struggling for quite a while to lock on a DVB-S2 
transponder. And recently I got some information that they changed the 
symbol rate to 45MS/s which looks borderline to me. Can someone confirm 
that the TT 3200 can do that?
I also attach a log that I obtained when trying to lock on this 
transponder with the following parameters:
QPSK, FEC= 5/6, 45MS/s
The driver I used was Igor's (very recent) one with szap-s2. The status 
oscillates between 00 and 0b, it can take long to attain 0b which 
suggests long and unreliable lock (never got VITERBI, just demod lock
+sync).
Thx for any help
Bye
Emmanuel

Symbol rate limit for TT 3200

[Manu]

[-- Attachment #1: Type: text/plain, Size: 79 bytes --]


I know I know I forgot to attach the log ;-)
Here you go...
Bye
Emmanuel

[-- Attachment #2: TP-45000-SR-FEC-56-Lock-SYNC-but-No-VITERBI.txt.bz2 --]
[-- Type: application/x-bzip, Size: 7794 bytes --]

Re: Symbol rate limit for TT 3200

[Lou Otway]

Manu wrote:
> 	Hi all,
> I have been struggling for quite a while to lock on a DVB-S2 
> transponder. And recently I got some information that they changed the 
> symbol rate to 45MS/s which looks borderline to me. Can someone confirm 
> that the TT 3200 can do that?
> I also attach a log that I obtained when trying to lock on this 
> transponder with the following parameters:
> QPSK, FEC= 5/6, 45MS/s
> The driver I used was Igor's (very recent) one with szap-s2. The status 
> oscillates between 00 and 0b, it can take long to attain 0b which 
> suggests long and unreliable lock (never got VITERBI, just demod lock
> +sync).
> Thx for any help
> Bye
> Emmanuel
> --
>   
I've been having a similar problem and have tried using the patch from 
Igor Liplianin.

http://marc.info/?l=linux-dvb&m=122730082915638&w=2

Unfortunately this patch didn't work for my device until I reduced 
hi_clk to 110MHz.

I'm concious that Manu Abraham (to avoid confusion with the OP, also 
called Manu) doesn't recommend a frequency higher than 99MHz.

Is this a device limitation? What are the chances of damaging the device 
by setting a clock frequency higher than 99MHz?

Many thanks,

Lou