[USRP-users] Using a reference clock on USRP E310/312

Cho, Daniel J (332C) daniel.j.cho at jpl.nasa.gov
Wed Jul 26 10:43:03 EDT 2017

Hello –

Yes I am trying to achieve phase synchronization.  So once I set the time source using the function call if (not time_source.empty()) usrp->set_time_source(time_source);, will time and frequency for the two USRPs be aligned?  Also, is it true that the USRP E310/E312 cannot use a 10 MHz ref clock or can I just set the time source using the 10MHz reference instead of the 1PPs?

From: Derek Kozel [mailto:derek.kozel at ettus.com]
Sent: Wednesday, July 26, 2017 6:56 AM
To: Cho, Daniel J (332C) <daniel.j.cho at jpl.nasa.gov>
Cc: usrp-users at lists.ettus.com
Subject: Re: [USRP-users] Using a reference clock on USRP E310/312

To get time and frequency alignment on a pair of E31xs you can supply the 1PPS to both units. The example programs do not all support setting the time source.
Here is an example which supports setting the time source, you can modify other examples based on this.
Are you trying to achieve phase synchronization?

On Tue, Jul 25, 2017 at 11:40 PM, Cho, Daniel J (332C) via USRP-users <usrp-users at lists.ettus.com<mailto:usrp-users at lists.ettus.com>> wrote:
Hello –

I have 2 USRPs (both E310/E312) which I want to sync up using an external clock.  I read that the embedded series cannot take in a 10MHz reference clock but can take in a 1PPS.  I generated a 1 PPS signal using a signal generator and using a power splitter, I sent the 1PPS signal to both USRPs via the sync port on the USRPs.  When I try to run an example programs (rx_samples_to_file on one USRP and tx_samples_from_file on the other USRP) using the ref argument, it says that the ref argument is not supported.   How can I sync up the two USRPs?


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