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

[Dave Chapman <dave@dchapman.com>]

On Tuesday 08 October 2002 22:19, Klaus Schmidinger wrote:
> Are these frequency offsets always +/-167kHz? Will that be the same for
> other countries, too?

In the UK the offsets (if present) are always +/- 167KHz.  I haven't heard 
about offsets being used in other countries.

> I'm asking because I would like to make the frequency for DVB-T channels
> in VDR's channels.conf also be in MHz, and if that offset thing is in any
> way standardized we could just add another DVB-T specific parameter to
> cover the offset (like O0 = 0 kHz, O1 = +167 kHz, O2 = -167kHz).
> 
> I wonder, though, why that offset is necessary, and whether the driver
> shouldn't be able to tune to a channel at, say, 490 MHz - 167 kHz
> automatically if it is given an inital frequency of 490 MHz. I mean
> 167 kHz isn't _that_ far off for a transponder with several MHz bandwith.
> Or am I missing something important here?

No, trying to tune to a frequency of 488.833MHz by approximating to 489MHz 
doesn't work - I've just tried it.   

I think the "O" option would just make the channels.conf more confusing - it 
is much simpler just to keep the frequency the way it is, in KHz.

Regards,

Dave.


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