On Fri, Apr 17, 2009 at 03:58:56PM -0700, Somya Ajmera wrote: > Hi all, Did any body else had a problem while transmitting through > USRP board? I am using Basic Tx/Rx board. When I tried to send a > sinusoidal signal of 50Khz (through GRC) and tried to look at at the > transmitted signal on to the oscilloscope by probing the Tx SMA > connector, it displayed a sinusoid of 25Mhz with a constant DC > offset. I guess there is an up conversion to an IF frequency is been > done in USRP, but do anybody know is there any fixed frequency the > signal is up converted to? At what mamimum power can a signal be > transmitted using USRP?Is there a way we can control Transmission > Power? > > Also when I unplugged the power to USRP and the USB cable, then also > I was able to see a sinusoid, on the scope, of 60Mhz. > > Is there anything we need to enable in order to make the transmitter > work? Also is there any kind of reference manual available for the > Basic TX/Rx Daughter board? > > Thanks & Regards, > Somya Ajmera
Try this: $ usrp_siggen.py -i 64 --sine -w 50k -a 16000 -f 5M And look at it with a spectrum analyzer. You'll see a sine wave at 5.050 MHz. The Basic Tx has a transformer-coupled output, and that will attenuate output below 1MHz. For help understanding the above command, try $ usrp_siggen.py --help Eric _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
