Hi,

I've finally had a bit of time to have a go with the VRT branch - I noticed
with the rx_timed_samples example it's now possible to start rx_streaming at
a specific time so I've quickly merged my custom usrp2 timestamp source
block (gr-usrp2 - providing a second stream of timestamps - I dont think the
vrt_header is available after this block at the moment).
I think I also need to add the python calls to the start_streaming_at
functionality.

As I havent got a scope around at the moment to check, am I correct in
thinking that the old config_mimo command to use the 10MHz Ref Input needs
to be replaced with something like:

u=usrp2.source_32fc()

clock_settings=usrp2.clock_configt_t()
clock_settings.ref_source=clock_settings.REF_SMA
u.clock_config(clock_settings)

I've also noticed the set_time_at_next_pps() command, I'm assuming I can use
this to force the usrp2 to set zero fractional seconds and some integer (or
zero) number of seconds - this seems to be similar to what the
rx_timed_samples example is doing.

Is the PPS used after this to keep the integer seconds increment aligned
with the PPS?

Thanks in advance,

Tim
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