hello, how you did it, that changed in the sensing spectrum, I'm using the module FLEX900?
devin kelly-2 wrote: > > Hello, > > I've created a spectrum sensor with the USRP2, my python script uses the > same idea as usrp_spectrum_sense.py found in gnuradio. That is, it tunes, > takes an FFT, records, retunes, etc. > > I have two problems with my data though. In the file attached is some TV > spectrum (left half) and noise (right half). > > My first question is this: why isn't the spectrum for the TV signal flat, > it > seems to bob up and down. Note that each segment is from a different FFT, > that is each FFT produces that oval shape. At first I thought this had > something to do with the window I was using but I've tried hamming, > blackman-harris, and rectangular windows and they all have this effect. > > My second question is why isn't the transition between TV spectrum and > noise > more smooth? It looks like it could be smooth but the gain seems to jump > for > an FFT right after 566 MHz and then settle down again. I thought this > might > be the AGC but I've tried different attack/decay rates, different > reference > levels, etc with the agc2_cc block but the problem remains. > > Any help with either of these questions would be appreciated, > Devin > > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > http://lists.gnu.org/mailman/listinfo/discuss-gnuradio > > jhar...@hotmail.com -- View this message in context: http://old.nabble.com/USRP2-Spectrum-Sensing-Help-tp31183192p32206004.html Sent from the GnuRadio mailing list archive at Nabble.com. _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
