Eric Blossom wrote: > > On Mon, Dec 10, 2007 at 06:38:49PM -0800, Brook Lin wrote: >> >> I have figured out why it failed to set freq. Now my question is still >> how >> can I get one GUI with one plot and show all the spectrum, say all FM >> stations. >> >> Thanks > >>Brook, you'll have to look at the code and figure this out yourself. >>If you have a more specific question, please ask it. >> >>Eric > > Hi, > > I think there is a bug in usrp_spectrum_sense.py code. The bug is in > calculating the maximum center frequency. > The used equation is : > self.max_center_freq = self.min_center_freq + (nsteps * self.freq_step) > > while the correct equation should be : > self.max_center_freq = self.min_center_freq + ((nsteps-1) * > self.freq_step) > > Example : > using usrp_spectrum_spense.py : > > if :- > min_freq = 5MHz, max_freq = 30MHz, usrp_rate = 8MHz, > > then :- > > freq_step = 0.75 * 8 = 6MHz > nsteps = math.ceil(( 30 - 5 ) / 6 ) = 5 > min_center_freq = 5 + 6/2 = 8MHz > max_center_freq = 8 + 5*6 = 38MHz (which is too high) > > Regards, > > Firas, > > _______________________________________________ > Discuss-gnuradio mailing list > [email protected] > http://lists.gnu.org/mailman/listinfo/discuss-gnuradio > >
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