Given those constraints, no. 

But you could read the time on the host then use set_time_next_pps(). Most GPS 
with an names output are compatible with USB serial
Ports. 

Sent from my iPhone

> On Jan 10, 2022, at 6:53 PM, Jonathan Pratt <jpr...@srcaus.com> wrote:
> 
> Hey radio buffs.
> 
> We have an application requiring the use of an external GPS with an X310. I 
> have been looking through the uhd api methods and can't find a solution that 
> suits our arrangement.
> 
> Is it possible to somehow set the system time on the X310 so that time is 
> reported accurately by the X310 with respect to an external PPS signal?
> Is it possible to feed the NMEA data string into the X310 (eg via GPIO 
> configured for serial traffic) so that time is reported accurately by the 
> X310 with respect to an external PPS signal?
> 
> By "possible" I mean simply and without rewriting HDL or the ZPU programming; 
> or wring the GPS signals into the GPSDO connector.
> 
> Kind regards
> Jonathan Pratt
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