Quoting Anastasopoulos Achilleas <[EMAIL PROTECTED]>: > I hooked up an analog osciloscope on the Basic Tx daughterboard and tested > the usrp_siggen.py. It seems to work! > > A couple of questions: > > 1) what are the units of amplitude? (the default is 16e3)
The signal into the USRP is a 16-bit signed number. 32767 is full scale. > 2) why does the amplitude change if I change the frequency? > I guess it is related to a constant multiplicative factor in > the interploator? Do you mean change the baseband (software) frequency, the DUC frequency, or the sample rate? > 3) What is the expected relationship between the I and Q channel > outputs? I see the same signal with a phase shif, but not sure > where the phase shift is comming from. 90 degree phase shift. Matt _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
