[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


Hello,

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.
http://files.ettus.com/manual/page_usrp_e3x0.html#e3x0_hw_sync

Here is an example which supports setting the time source, you can modify
other examples based on this.
https://github.com/EttusResearch/uhd/blob/maint/host/examples/test_pps_input.cpp#L68

Are you trying to achieve phase synchronization?

Regards,
Derek

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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>
>
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