The underflows you're getting mean your host PC isn't providing samples fast enough for the rate the radio is consuming them and it's underrunning the TX buffer. Likely there isn't enough bandwidth between the host PC and the radio to support 100 Msps. There is a pretty good discussion of bandwidth and sampling rates here:
https://kb.ettus.com/About_USRP_Bandwidths_and_Sampling_Rates Very respectfully, Joshua White Precision Timing Systems Engineer Engineering & Support Solutions Directorate <http://www.riversideresearch.org/> www.riversideresearch.org T: 937.986.3153 | F: 937.431.3811 This e-mail message, including any attachments, is for the sole use of the intended recipient(s) and may contain proprietary, confidential or privileged information or otherwise be protected by law. Any unauthorized review, use, disclosure or distribution is prohibited. If you are not the intended recipient, please notify the sender and destroy all copies and the original message. From: ygurupra...@umass.edu <ygurupra...@umass.edu> Sent: Wednesday, March 6, 2024 1:56 PM To: usrp-users@lists.ettus.com Subject: [USRP-users] X310 CAUTION: This email is from outside of Riverside Research. Be careful when clicking links or opening attachments unless you know the content is safe. Could some help me if this is working as expected? ./bin/txrx_loopback_to_file --tx-args addr=192.168.10.2 --rx-args addr=192.168.10.2 --tx-rate 100e6 --rx-rate 6.5e6 --tx-freq 20e6 --rx-freq 18e6 Creating the transmit usrp device with: addr=192.168.10.2... [INFO] [UHD] linux; GNU C++ version 8.5.0 20210514 (Red Hat 8.5.0-20); Boost_106600; UHD_4.2.0.1-0-g321295fb [INFO] [X300] X300 initialization sequence... [INFO] [X300] Maximum frame size: 1472 bytes. [INFO] [GPS] Found an internal GPSDO: LC_XO, Firmware Rev 1.101 [INFO] [X300] Radio 1x clock: 200 MHz [INFO] [0/KeepOneInN#0] Setting default MTU forward policy. Creating the receive usrp device with: addr=192.168.10.2... Using TX Device: Single USRP: Device: X-Series Device Mboard 0: X310 RX Channel: 0 RX DSP: 0 RX Dboard: A RX Subdev: BasicRX (0) RX Channel: 1 RX DSP: 1 RX Dboard: A RX Subdev: BasicRX (1) RX Channel: 2 RX DSP: 2 RX Dboard: B RX Subdev: Unknown (0xffff) - 0 TX Channel: 0 TX DSP: 0 TX Dboard: A TX Subdev: BasicTX (0) TX Channel: 1 TX DSP: 1 TX Dboard: B TX Subdev: Unknown (0xffff) - 0 Using RX Device: Single USRP: Device: X-Series Device Mboard 0: X310 RX Channel: 0 RX DSP: 0 RX Dboard: A RX Subdev: BasicRX (0) RX Channel: 1 RX DSP: 1 RX Dboard: A RX Subdev: BasicRX (1) RX Channel: 2 RX DSP: 2 RX Dboard: B RX Subdev: Unknown (0xffff) - 0 TX Channel: 0 TX DSP: 0 TX Dboard: A TX Subdev: BasicTX (0) TX Channel: 1 TX DSP: 1 TX Dboard: B TX Subdev: Unknown (0xffff) - 0 Setting TX Rate: 100.000000 Msps... Actual TX Rate: 100.000000 Msps... Setting RX Rate: 6.500000 Msps... [WARNING] [0/DDC#0] The requested decimation is odd; the user should expect passband CIC rolloff. Select an even decimation to ensure that a halfband filter is enabled. Decimations factorable by 4 will enable 2 halfbands, those factorable by 8 will enable 3 halfbands. decimation = dsp_rate/samp_rate -> 31 [WARNING] [0/DDC#0] The requested decimation is odd; the user should expect passband CIC rolloff. Select an even decimation to ensure that a halfband filter is enabled. Decimations factorable by 4 will enable 2 halfbands, those factorable by 8 will enable 3 halfbands. decimation = dsp_rate/samp_rate -> 31 [WARNING] [MULTI_USRP] Could not set RX rate to 6.500 MHz. Actual rate is 6.452 MHz [WARNING] [0/DDC#0] The requested decimation is odd; the user should expect passband CIC rolloff. Select an even decimation to ensure that a halfband filter is enabled. Decimations factorable by 4 will enable 2 halfbands, those factorable by 8 will enable 3 halfbands. decimation = dsp_rate/samp_rate -> 31 [WARNING] [0/DDC#0] The requested decimation is odd; the user should expect passband CIC rolloff. Select an even decimation to ensure that a halfband filter is enabled. Decimations factorable by 4 will enable 2 halfbands, those factorable by 8 will enable 3 halfbands. decimation = dsp_rate/samp_rate -> 31 [WARNING] [MULTI_USRP] Could not set RX rate to 6.500 MHz. Actual rate is 6.452 MHz [WARNING] [0/DDC#1] The requested decimation is odd; the user should expect passband CIC rolloff. Select an even decimation to ensure that a halfband filter is enabled. Decimations factorable by 4 will enable 2 halfbands, those factorable by 8 will enable 3 halfbands. decimation = dsp_rate/samp_rate -> 31 [WARNING] [0/DDC#1] The requested decimation is odd; the user should expect passband CIC rolloff. Select an even decimation to ensure that a halfband filter is enabled. Decimations factorable by 4 will enable 2 halfbands, those factorable by 8 will enable 3 halfbands. decimation = dsp_rate/samp_rate -> 31 [WARNING] [MULTI_USRP] Could not set RX rate to 6.500 MHz. Actual rate is 6.452 MHz Actual RX Rate: 6.451613 Msps... Setting TX Freq: 20.000000 MHz... Actual TX Freq: 20.000005 MHz... Setting RX Freq: 18.000000 MHz... Actual RX Freq: 17.999995 MHz... [WARNING] [0/Radio#0] Attempting to set tick rate to 0. Skipping. Press Ctrl + C to stop streaming... Setting device timestamp to 0... 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