Hi,
These days I am trying to synchronize two USRP2 with PPS signal and UHD. The
two USRP2 is connect with same reference clock and PPS signal. I use function
"set_time_next_pps(uhd::time_spec_t(0))" to set time to be zero, and make two
USRP2 start sampling after 3 seconds. The result shows that there is still
phase difference, which means a delay( about 30ns) between USRP2s.
I used 10MHz reference clock as input and set DDC frequence to 10MHz. Then I
get two complex DC signal. The phase difference is about 0.3*2pi. It seems
that the PPS impedence difference between USRP2s is the reason of delay. Any
clues or solution???
By the way, the stream mode "
STREAM_MODE_NUM_SAMPS_AND_DONE" does not work with "set_time_next_pps"
function. It works with "set_time_now". But stream mode "
STREAM_MODE_START_CONTINUOUS " works well with "set_time_next_pps" function.
Thank you!
Liang
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