On Wed, Mar 17, 2010 at 04:09:09PM -0700, Damien Serant wrote: > > Hi everybody, > > I received few days ago my new URSP2 with the WBX daugtherboard and i have > some questions. > First there is two input: one labeled Tx/Rx and the other Rx2. Why is there > two Rx input and which one i have to use for reception ?
TX/RX is used for half duplex operation and can be either TX or RX, RX2 is used for RX-only or full duplex operation. The input can be selected with the -A switch to usrp_fft.py, which appears not to have been added to usrp2_ffy.py yet. Thus, the default on usrp2_fft.py will be to use the TX/RX port. > Second, for my first test i plotted the spectrum of received signal (without > any antenna) by using the usrp2_ftt.py example script. Looking at the > spectrum shape it appears there is a passband filter of about 8MHz bandwidth > somewhere in the reception chain. I believed, according to datasheet, that > the bandwidth was 30 MHz. An explanation ? The bandwidth is roughly 30MHz, perhaps you have your decimation rate set to 100M/8M = 12.5 .... so maybe 8 or 16? > Third, the same spectrum shows lot of spurious harmonics relatively powerful > (compared to the noise floor). Is it normal ? There are clock multiples that show up, what sort of spurs are you seeing? > > Thanks in advance for your answers. > > Damien > > -- > View this message in context: > http://old.nabble.com/Questions-about-WBX-daugtherboard-tp27938947p27938947.html > Sent from the GnuRadio mailing list archive at Nabble.com. > > > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > http://lists.gnu.org/mailman/listinfo/discuss-gnuradio _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio