[linux-dvb] Re: New UK DVB-T channels testing

[Holger Waechtler <holger@convergence.de>]

Dennis Noordsij wrote:
> On Wednesday 09 October 2002 12:53, Stephen Davies wrote:
> 
>>On Wed, 9 Oct 2002, Klaus Schmidinger wrote:
>>
>>>That's odd... IIRC with DVB-S you can be off by even 1 or 2 MHz and the
>>>driver will tune to the transponder correctly, so I really wonder why
>>>this isn't possible with DVB-T. I mean it's just a mere 166 kHz! Is there
>>>no AFC in the DVB-T part of the driver?
>>
>>166kHz off on a frequency of 600MHz is more than twice the error of 2Mhz
>>off from 12GHz.
>>
>>Steve
> 
> 
> I would also like to confirm that tuning to 162000000 Hz and 161875000 Hz 
> (DVB-C, difference of 125kHz) can make all the difference between getting a 
> lock or not. Funnily enough for the Windows stuff specifying the published 
> frequency usually tunes just fine, like they already account for a small 
> offset (or do a little zigzagging to get a lock).

In any case the frequency search will need some time, so if you want to 
achieve a fast tuning you should specify the frequency as exact as 
possible.

I think about opening the zigzag search range a little more for DVB-C 
and DVB-T, but I'm still not yet sure if this is a good idea...

Holger




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