[mythtv] what are the right frequency offsets?

[Daniel Kristjansson]

On Mon, 2010-04-05 at 23:36 +0200, Petr Stehlik wrote:
> Nick Morrott píše v Po 05. 04. 2010 v 21:39 +0100:
> > Although I haven't found a definitive answer (yet) in official
> > technical documentation (from ETSI, for example), other research
> > suggests that for DVB-T transmission, channels having a 7MHz
> > separation can have a +/- 125kHz offset, and channels having an 8MHz
> > separation can have a +/- 167kHz offset.
> 
> I've happened to find a discussion mentioning that in Czech there is no
> offset used on the main digital transmitters (the offsets were used only
> on the analog transmitters to avoid interference from different
> transmitters on the same channel).
> 
> My question is if it is safe to have the 167 kHz offset there as an aid
> to some less capable (?) hardware that is not able to tune with 0,0
> offsets. Can it hurt somehow? Will it cause problems to other tuners, or
> just slow the tuning down a bit or is it simply good idea to put there
> the max offsets?
> 
> I do have one report from an user that managed to tune more multiplexes
> by adding the +-167 kHz offsets there but I don't know if it can have
> any negative impact on others that are happy with the 0,0 offsets now.

It's perfectly safe but the channel scan will take longer to complete.

-- Daniel