[mythtv-users] Just built MythTV, beginner questions

[Rudy Zijlstra]

Maarten van den Berg wrote:

>Hm... Now I'm getting confused.  So this is the reason those bastards have all 
>the stations programmed off-channel (like, 61+ and 22- and so on) ?
>  
>
Yep.

>(Well, saving bandwidth is good thing of course, so channels will fit :-) 
>The bit about two frequencies to decoders... isn't that just a waste of 
>bandwidth, thereby effectively nulling any that was saved ? 
>
>  
>
No, not really. They have to reserve 2 frequency slots for the 
remodulated signal anyways. This has to do with limitations of the 
remodulator, and with an "echo" signal beside the true signal which 
makes the adjoining frequency slot unusable anyways.

By using the channel layout as they are using they can:
- make most efficient use of the available bandwidth in order to
- fit in as many as possible of DVB broadcast channels and
- Euro-DOCSIS downstream channels
both of which are 8MHz DVB MPEG signals.
If i remember correctly there are 3 of the latter present on the cable.

Cheers,

Rudy