[linux-dvb] Re: DVB-X

[Georg Acher <acher@in.tum.de>]

On Sun, Jul 08, 2001 at 12:40:38PM -0400, William E. Mrozinski wrote:
> Thomas,
> 
>     Part of a satellite LNB function is to 'downconvert' ( re-map ) the received frequency
> ranges of the LNB ( 3.0-5.0Ghz(c-band) or 10.0-13.0Ghz(ku), approx.) down to the 950-2150Mhz
> input of the receiver.  You should be able to also re-map 'up' from the broadcast/cable range
> 5-950Mhz and place it at the 950-2150Mhz range of the input tuner of a DVB-S card.  I've
> never seen such an adapter but it may exist somewhere already.  There are surely other
> stumbling blocks that probably make this difficult ( channel bandwidth and other stuff ); but
> it sure would be a handy little converter and would turn this into a very simple task, in
> theory.  Anybody know of such a device? (g)

If you only look at the frequency, it would be possible. But DVB-S and DVB-C
use different modulation techniques. DVB-C uses QAM-64, whereas DVB-S uses
QPSK. Both systems require different decoding equipment. 

-- 
         Georg Acher, acher@in.tum.de         
         http://www.in.tum.de/~acher/
          "Oh no, not again !" The bowl of petunias          


-- 
Info:
To unsubscribe send a mail to listar@linuxtv.org with "unsubscribe linux-dvb" as subject.