[Discuss-gnuradio] Re: How to scan the whole ISM band?

[Patrick Strasser]

Goodman Roy wrote am 2008-07-15 00:26:
> Hi all,
>
> I would 
> like to know if it is possible to sense the whole 
> band,2.4-2.4835GHz, through the USRP?  However, the ADC can only 
> support  64Msamples/sec. How can I scan the whole ISM band and draw the 
> spectrogram of the ISM band,2.4-2.4835GHz, through the USRP?

You can receive 32MHz at a time, but you are limited to 8MHz through the 
USB bus. You cannot scan the whole 2.4Ghz ISM band at a time, but you 
can step through it. If you want to detect unused frequencies you'd 
probably just want to calculate the power over a reasonable time 
interval to decide if some is using the band in question.

You may want take a look at 
gnuradio-examples/python/usrp/usrp_spectrum_sense.py [1]

Patrick

[1] 
http://gnuradio.org/trac/browser/gnuradio/branches/releases/3.1/gnuradio-examples/python/usrp/usrp_spectrum_sense.py
--
Engineers motto: cheap, good, fast: choose any two
Patrick Strasser <patrick dot strasser at student dot tugraz dot at>
Student of Telematik, Techn. University Graz, Austria