[Discuss-gnuradio] GPS PPS signal to synchronize two usrp N210

[llc1989522]

Dear all

I am trying to use two GPS PPS signals to synchronize two USRP N210 (Tx and
Rx). 

First I connected the PPS signal to the front SMA port of USRP. Then I just
used command set_time_unknown_pps(uhd.time_spec()). However, I found they
seems not synchronized. The transmitter is not transmitting when the up edge
PPS signal is coming. Is there other method to synchronize two USRPs that
they can sample at the same time.

Thank you very much for your time and help.

LIn



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