[vdr] Re: automatic channel scan

[Christian Berger <einStein@donau.de>]

Steffen Koch schrieb:
> 
> Christian Berger wrote:
> 
> > > > Ok, then you always use the NIT for every transponder you are turned in
> > > > anyhow, just like the EPG. You should have at least one channel
> > > > programmed for every transponder to let that work efficiently.
> > > Is there an information on the satelite about transponder frequencies?
> > > If so you only have to tune one "range" to find one such transponder and
> > > then get a complete transponder list to synchronize tuning with...
> > I personally don't think a transponder frequencies transmission is
> > possible. There are many uplink stations, so each of those stations
> > would have to have a complete, updated (think of those 72Mhz
> > transponders) list of channels. This would even include little
> > remote-truck uplink-stations which don't even have internet access.
> why that?
> every transponder has a fixed frequency and polarization.
> every TV-station normally transmits its signal to one uplink station,
> they multiplex the signal with TDM and send it to the satellite for
> transmission.

Yes, but there are dozens of uplink stations. You might be able to sync
all the large ones quite easily, but what about all those small
remote-trucks?
And still digital transmissions do not always send at the center of a
transponder, just look at Deutsche Welle TV on Eutelsat. It shares it's
sattellite together with an analog transmission.

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