External Clock with USRP2

GNU Radio
1

We’ve been testing the clock of our USRP2 and find that it stabilizes at
about 8 parts per million low in frequency. Using a precise 10 MHz
external clock does not seem to have any effect. Any ideas on how we
can bring it in a bit closer?

Thanks,

Cliff

2

Kelley, Clifford W wrote:

We’ve been testing the clock of our USRP2 and find that it stabilizes at about 8 parts per million low in frequency. Using a precise 10 MHz external clock does not seem to have any effect. Any ideas on how we can bring it in a bit closer?

Thanks,

Cliff

Did you call “config_mimo(usrp2.MC_WE_LOCK_TO_SMA)” on the usrp2 object
you created? That tells the board to get its clock from the external SMA
connector.

Tom

3

Tom,

Thanks very much. That worked. Somehow we missed that in our searches.

Cliff