On Saturday 21 February 2004 02:44, Robert Schlabbach wrote: > From: "Andrew de Quincey" <[EMAIL PROTECTED]> > > > Now, I'm able to lock on to low symbol rate signals... > > I've just managed it with a 4340000 symbol rate... > > getting a REALLY good signal from it, but it took about 10 seconds > > to tune (the current timeout is hardcoded to 2 seconds). The STV0299B > > docs say it needs a certain number of symbols before being able to > > get a lock... > > That can't explain the long lock time. My card is locking to the 22000 and > 27500 MBaud ASTRA transponders in less than 5ms. Since 4340 MBaud is about > 1/5th to 1/6th of that, the demodulator would get the same amount of > symbols in 5-6 times that, i.e. in 25-30ms. That's nowhere near 10 seconds. > > But have you checked the AFC reading after the demodulator was locked on? > Low symbol rate transponders are using a much narrower frequency band than > high symbol rate ones, and thus exact tuning may be much more important. A > 1MHz offset may not be much in a 30MHz band, but it makes much more of a > difference in a 5MHz band... > > If possible, try compensating the offset by adjusting the tuner PLL > frequency as much as possible and see if/how that affects the lock times...
I think I mustn't be doing something right with the tuner.. I had it locking on to low symrates in about 3 seconds for a while... then it just... stopped working. I think I'll concentrate on the general tuning problem first. -- Info: To unsubscribe send a mail to [EMAIL PROTECTED] with "unsubscribe linux-dvb" as subject.