I don't think there is any AGC on USRP hardware... Very Respectfully,
Dan CaJacob On Wed, Feb 19, 2014 at 9:57 AM, Aditya Dhananjay <adi...@cs.nyu.edu> wrote: > > > > On Wed, Feb 19, 2014 at 6:26 AM, Lebowski80 <ale.rasche...@gmail.com>wrote: > >> Hello everyone, >> >> Before to explain my problem I give some technical information about my >> hardaware. I'm using USRPs v1 and the boards integrated are XCVR2450 >> Transceivers. >> >> I'm using the script usrp_spectrum_sense.py in a USRP to detect a signal >> in >> a ISM channel. To have a signal expressed in db I did this simple >> operation >> to the received signal: >> >> signal_db = 20*(math.log10(math.sqrt(m.data[0]/tb.slot_number))) >> >> I can control the signal transmitted in the ISM channel; so, I know >> exactly >> the time when there is a signal to be detected in the channel. During the >> first hours the USRP detects the signal giving me a value of around 40 db >> but after some hours such a detected signal decreases up to roughly 10 db >> and it does not change anymore regardless of the signal transmitted in the >> ISM channel. Only if I kill the process running the usrp_spectrum_sense.py >> script and execute it again, the USRP starts to detect again the 40 db >> value. The signal to be detected in the ISM channel is always the same. >> Can >> anyone tell me which is the problem? >> >> Thanks in advance. >> > > I have no clue, but my first (and only) guess would be the automatic gain > control (AGC) on the USRP hardware. > > If you figure it out, please let us know! > > best, > aditya > > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > >
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