Internal is to the SDRs on-board TCXO, while external pulls the clock from the external clock in port on the rear of the device. Unless I am mistaken, to use the GPSDO, you must set the clock source and time source to gpsdo. Thats the way it works on the N310, at least, so I suspect its similar for the X310.
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: Struyf Amélia via USRP-users <usrp-users@lists.ettus.com> Sent: Friday, May 6, 2022 7:42 AM To: usrp-users@lists.ettus.com <usrp-users@lists.ettus.com> Subject: [USRP-users] USRP X310 with GPSDO : clock source parameter CAUTION: This email is from outside of Riverside Research. Be careful when clicking links or opening attachments unless you know the content is safe. Dear all, Im using USRPs X310 with integrated GPSDO. My goal is to compare the quality of different types of local oscillators but Im confused with the clock reference source parameter. When the clock reference source is specified as internal will my reference be the internal TCXO or the GPSDO? Similarly, when the clock source is specified as external which of these two clocks will be the reference? Thank you for your answer, Amélia
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