What you're trying to do is pretty straight forward. I do this here in my lab all the tiem. Can you show us your flowgraph? How are you running tx_waveforms? Are you using a USB 3 port? How's the B200 connected to the oscilloscope?
On Mon, 27 Jul 2020 at 21:58, Aaron Smith via USRP-users < usrp-users@lists.ettus.com> wrote: > Marcus, > > I have tried frequencies ranging from 75-450 MHz. My scope is good to 500 > MHz. I have tried gain settings betweeb 30 and 60. I am using RG-174, which > is good to 1000 MHz. > > In my custom code I generate tones by sending repeating samples with a > value of 0.8. In the past this caused tones to appear at B200's center > frequency. This should work regardless of the clock rate or sample rate, > but in this case I'm using a 48 MHz master clock rate and a sample rate of > 8 MHz. > > I also followed a gnuradio companion tutorial to generate a tone and it > produced something ugly too. > > The only thing in my setup that changed is the host laptop. I switched to > a new laptop and had to build UHD from scratch. However, gnuradio companion > appears to use a different UHD version, so I'm skeptical that is the > problem. > > Thanks for your help. > > On Mon, Jul 27, 2020, 7:45 PM Marcus D. Leech via USRP-users < > usrp-users@lists.ettus.com> wrote: > >> On 07/27/2020 09:05 PM, Aaron Smith via USRP-users wrote: >> >> Hello all, >> >> I am trying to output a sine wave from a B200 using custom code, or the >> UHD tx_waveform example. In either case, when I view the output on an >> o-scope, there is not a pure sine wave. The output looks more triangular >> wave. I have used this scope with other B200s and the same code to get a >> pure sine. Is the radio damaged? Is there some sort of calibration >> required? I am using UHD 3.15.0. >> >> Thanks >> >> >> >> _______________________________________________ >> USRP-users mailing >> listUSRP-users@lists.ettus.comhttp://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com >> >> What frequency? What gain settings? What is your baseband bandwidth? Is >> your coax cable known to be "good" at the frequency of interest? >> What sample rate? Is the baseband signal well within the Nyquist >> limits? >> >> >> _______________________________________________ >> USRP-users mailing list >> USRP-users@lists.ettus.com >> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com >> > _______________________________________________ > USRP-users mailing list > USRP-users@lists.ettus.com > http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com > -- Sincerely, Alex-M-Humberstone PhD Student Klipsch School of Electrical Engineering New Mexico State University Las Cruces, New Mexico
_______________________________________________ USRP-users mailing list USRP-users@lists.ettus.com http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
