I was indeed trying to transmit with an empty slot; switching the channel to 1 fixed the problem.
Thanks for your help! On Tue, Oct 14, 2025 at 3:16 PM Brian Padalino <[email protected]> wrote: > On Tue, Oct 14, 2025 at 3:05 PM Daniel Mayer <[email protected]> > wrote: > >> Hello, >> I am attempting to transmit with a USRP X310 using the 'tx_waveforms' >> example (./tx_waveforms --rate 25e6 --freq 900e6 --gain 20), but a >> SignalHound spectrum analyzer placed next to the transmitting antenna of >> the USRP is not picking up any signal above the noise floor at that >> frequency. The spectrum analyzer shows signals transmitted by other >> devices, so it seems unlikely that the spectrum analyzer is broken. >> >> The text output of the example is as follows: >> >>> Setting TX Rate: 25.000000 Msps... >>> Actual TX Rate: 25.000000 Msps... >>> >>> Setting TX Gain: 20.000000 dB... >>> >>> *Actual TX Gain: 0.000000 dB...* >>> Setting device timestamp to 0... >>> >>> *[WARNING] [0/Radio#0] Attempting to set tick rate to 0. Skipping.*Setting >>> TX Freq: 900.000000 MHz... >>> Setting TX LO Offset: 0.000000 MHz... >>> *Actual TX Freq: 0.000000 MHz...* >> >> I did notice that the 'Actual TX Gain' and 'Actual TX Freq' are both set >> to 0; could this be a cause of the problem? >> >> For completeness, here are the configuration parameters that the example >> prints out: >> >>> [INFO] [X300] Radio 1x clock: 200 MHz >>> Using Device: Single USRP: >>> Device: X-Series Device >>> Mboard 0: X310 >>> RX Channel: 0 >>> RX DSP: 0 >>> RX Dboard: A >>> RX Subdev: Unknown (0xffff) - 0 >>> RX Channel: 1 >>> RX DSP: 1 >>> RX Dboard: B >>> RX Subdev: UBX RX >>> TX Channel: 0 >>> TX DSP: 0 >>> TX Dboard: A >>> TX Subdev: Unknown (0xffff) - 0 >>> TX Channel: 1 >>> TX DSP: 1 >>> TX Dboard: B >>> TX Subdev: UBX TX >> >> > It looks like you have a UBX in slot 1 and nothing in slot 0, but you're > telling the TX waveforms program to transmit on the default channel (0 > presumably?) which would be the empty slot. > > Try changing the subdev or the channel specification to see if you can get > it to talk to the UBX. > > Good luck. > > Brian >
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