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

From: Hew How Chee
Subject: Re: [Discuss-gnuradio] Re: capture ADSL signal with TV card?
Date: Sat, 12 Apr 2008 06:37:41 -0700 (PDT)


The CX2388x sampling rate is 27 MHz and has a DC
blocking capacitor input. You can try applying the
ADSL direct to its input with the correct signal
level. My concern is more to the noise and the
resolution of the ADC which is currently 8 bit.


--- Patrick Strasser <address@hidden>

> 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
> -

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