[mythtv-users] How to limit 2xDVB-S (+DiSEqC) to 1 LNB at a time?
Mike Perkins
mikep at randomtraveller.org.uk
Mon Apr 27 12:03:58 UTC 2009
Simon Hobson wrote:
> David Lister wrote:
>
>> Is there a way which would allow e.g. 2-4 sats for 2 tuners with one
>> cable? :) I'm still new to this...
>
> No.
>
> The reason is that unlike terrestrial where you just feed a load of
> signal down a cable and the tuner picks out what it wants, with sat, the
> LNB does some of the conversion. In a basic single sat system, signals
> sent up the cable will typically select high or low band, and horizontal
> or vertical polarisation - thus selecting one of four sets of signals.
> Since only one of the four sets of signals can be sent down the cable at
> once, that puts limitations on what signals can be tuned if you split
> the signal and run multiple tuners off it - ie the separate tuners can
> only access signals that are in the same band and on the same polarisation.
>
Interesting. Perhaps there's a case for a feature similar to multi-rec here?
Where the tuner(s) can select channels from the subset which the LNB has chosen?
--
Mike Perkins
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