USRP2 reference clocking


     I am trying to synchronize two USRP2s. I connected GPS 10MHz clock
to ref clock (to SMA) of 1st USRP2, and used the MIMO connector from 1st
USRP2 to 2nd USRP2 as given in
I noticed the clock drift is still there and no synchronization. Couple
of questions.

(i) Do I have to do any modification in the source code and in the
(ii) Is there any simple program to check if USRP2 is locked to external
ref clock.
Any help is appreciated.

Krishna S

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