Questions about GPSDO compatibility and setup with USRP-2920

[aeg1224]

I am a university student conducting research using a USRP-2920.
As part of my experiment, I am installing a USRP GPS-Disciplined Oscillator Kit (Ettus Research) inside the device to reproduce and analyze GPS meaconing signal behavior for academic study related to synchronization and timing.

Since the USRP-2920 is equivalent to the Ettus Research USRP N200/N210, I would like to confirm the following points to ensure proper installation and operation.

However, at the moment, the GPSDO does not seem to be functioning correctly — it is not being recognized by the USRP or showing signs of GPS lock. I would appreciate your guidance in troubleshooting this issue as well.

1. Compatibility Confirmation

   • Is the USRP GPS-Disciplined Oscillator Kit officially compatible with the USRP-2920?

   • Are there any specific hardware, firmware, or UHD version requirements?

2. Setup and Recognition

   • How can I verify that the GPSDO is correctly recognized after installation?

   • Is there a command such as uhd_usrp_probe to confirm GPSDO detection?

3. Clock and Time Source Configuration

   • What is the correct way to configure the USRP to use the GPSDO as the reference clock and time source (e.g., set_clock_source("gpsdo"))?

   • Are these settings applied automatically?

4. GPS Lock and Operation Check

   • How can I verify that the GPSDO is locked to GPS and operating correctly?

   • How long does GPS lock usually take?

5. Antenna and Setup Recommendations

   • Are there any recommendations for antenna type, placement, or cable length for stable operation?

Thank you in advance for your advice and any related documentation.