[USRP-users] Using REF OUT / REF IN between two X310s
Marcus D. Leech
patchvonbraun at gmail.com
Sat Mar 2 23:04:20 EST 2019
On 03/02/2019 04:41 PM, Achilleas Anastasopoulos via USRP-users wrote:
> Hi all,
> In the past I had performed the following successful experiment using
> two N210's connected with a MIMO cable:
> I transmitted a single sinusoid of 10KHz through on USRP at a carrier
> of 1GHz and received it on another N210. The latter was configured to
> use the MIMO cable for clock reference. I was able to verify that the
> two clocks are indeed synced because I saw a single (noisy) point at
> the constellation scope (after correcting for the 10KHz on the Rx
> side) that was very stable (no rotation).
> I wanted to do the same with two X310's and connected them through a
> cable from the REF OUT of the first to the REF IN of the second.
> I also changed the Rx clock reference:
> Mb0: Clock Source = EXTERNAL
> Mb0: Time source = EXTERNAL
> However this experiment was unsuccessful: I do not see a single point
> but a circle which indicates that the two clocks at Tx/RX are not synced.
> Can you guide me as to what I am doing wrong.
Based on your description, shouldn't it be mb1 getting the EXTERNAL
sources, rather than mb0?
More information about the USRP-users