Quoting Sachi <[EMAIL PROTECTED]>: > Hi, guys > > I met some confusions when I tried the usrp_fft and > usrp_oscope. > > I generate a 2MHz, peak to peak 1V, sin wave using the > Agilent signal generator, and connect it to usrp. > However, the result of usrp_fft always shows a very > strong component at DC, besides the 2MHz. Why is that?
There is DC offset. I will explain this in a separate email. > Then I tried usrp_oscope, it works pretty well. But > when I zoom in, I found the wave form doesn't seem to > be sine, but something like square or triangle. Do I > miss any parameters here? At 8 MS/s, a 2 MHz sine wave only has 4 samples per cycle, so it will look like a triangle wave when you "connect the dots". Set the DDC frequency t something closer to your signal frequency, so it will do downconversion and you can see more points per cycle. For example, sudo ./usrp_oscope.py -c 1.9M Matt _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
