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

Derek Kozel derek.kozel at ettus.com
Wed Jul 26 09:55:31 EDT 2017


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> 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?
> Thanks
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> USRP-users at lists.ettus.com
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