[Discuss-gnuradio] Re: capture ADSL signal with TV card?

[Patrick Strasser]

Torsten Strelow wrote am 2008-03-28 06:40:
> Hi,
>
> do you think it is possible to use a CX2388x based TV card ( see
> http://www.geocities.com/how_chee/cx23881fc6.htm ) to capture the
> signal of an ADSL2+ Annex B line? Annex B uses the frequency range
> from 138kHz to 2,2 MHz.

Hello Thorsten

Your referenced page tells us that your tuner has a bandwidth of 30MHz, 
which is fine, and can be tuned from 50-850MHz. You want to capture from 
about 0 to 2.5 MHz. This is clearly out of the tuning range.
It says something about a 10.7MHz intermediate frequency.

You need some device to get your ADSL-signal in the tuning range, or to 
the IF of 10.7 MHz, but this is probably more difficult, as you need to 
connect to some internal line and not the default input (antenna in).

Patrick
--
Engineers motto: cheap, good, fast: choose any two
Patrick Strasser <patrick dot strasser at tugraz dot at>
Student of Telematik, Techn. University Graz, Austria