[linux-dvb] Re: scanning

["Robert Schlabbach" <robert_s@gmx.net>]

From: "D. Ratner" <dr_spam_free@yahoo.com>
> is there a utility out there that if given a
> frequency, it will scan for any usable data?
>
> In otherwords will check all polarities and symbol
> rates etc for data.

All symbol rates? Let's see: The STV0299B has 20 bits for the symbol rate
setting, that's 1,048,576 possible symbol rates. Even if you spend only
10ms checking each symbol rate, it'll take 3 hours to scan all symbol
rates. Add polarity and it'll be 6 hours. Add the 5 possible Viterbi FEC
rates and it'll take over a day...

Also, for low symbol rates, you'll have to wait much longer for a signal
lock, it can sometimes take several seconds to lock. If you wait 10 seconds
on each possible combination of symbol rate, polarization and FEC rate,
you'll spend over a thousand days, i.e. over three years scanning just a
single frequency.

I don't think you really want to do this. Better find the correct
parameters out from the satellite operator - they know, for sure.

Regards,
--
Robert Schlabbach
e-mail: robert_s@gmx.net
Berlin, Germany



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