[linux-dvb] software radio

BOUWSMA Barry freebeer.bouwsma at gmail.com
Wed Sep 17 14:24:31 CEST 2008


On Wed, 17 Sep 2008, Markus Rechberger wrote:

> >> Is it possible to access the sampling subsystem of a dvb card
> >> as like skystar 2 or any other ?

> have you had a look at:
> http://www.gnu.org/software/gnuradio/

I have now  :-)   thanks

And I feel really stupid, thinking this was a beginner question.
And I wish I had been asleep now.  My foot tastes terrible.

As you see, my understanding of the word `sampling' is based
on my understanding and work in radio and telephony some 30 years 
ago, when I didn't even realize that what I was doing would be 
somehow relevant today.

Anyway, I really do not know, but I would imagine that most
current sat devices, including the SkyStar, expect to have a 
hardware demodulator in place, and have no provision to get at
the signal on the other side of that chip.


Which makes me wonder -- the IF of a satellite signal is
typically 1GHz and up.  Is there a standard second IF
frequency that various hardware uses?  Given that it is
possible to have transponders with high symbol rates, I
wonder if satellite software receivers will be pushing too
hard on bandwidth of various busses -- which already seem
to suffer when delivering already-demodulated data.

Those familiar with chip and board design can answer the
original question far better than I ever could.


Then again, I have my head firmly set on 20-year-old
hardware designs...


think i'll quietly close my mailreader
barry bouwsma



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