Hello, I have a USRP x300 and I am trying to use the GPS module for clock sync. 
I am running Ubuntu 20 and am using external GPS antennas and am using GNUradio 
version 3.10.5.1 . I have the following arguments for the USRP source block:
Sync: Unknown PPS
Time Source: Default
Clock Source: O/B GPSDO

However, when running this block I get the following error:

Traceback (most recent call last):
  File "/home/.../Documents/test.py", line 290, in <module>
    main()
  File "/home/.../Documents/test.py", line 268, in main
    tb = top_block_cls()
  File "/home/.../Documents/test.py", line 92, in __init__
    self.uhd_usrp_source_0_0.set_clock_source('gpsdo', 0)
RuntimeError: RuntimeError: Reference Clock PLL failed to lock to gpsdo source.

Any help is appreciated and thank you to Marcus Müller for helping me resolve 
the incompatibility with the USRPs.

James Jones

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