WHat specific hardware line-up do you have?
You have to use set_time_unknown_pps(), but also, if you want phase
alignment (as opposed to mere coherence-with-an-offset), you need to use
timed tuning commands across your systems. This will result in zero
relative phase offset between boards, if you're using SBX or UBX (on the
X310). Note that this is phase between the boards, there's no way to
make certain the the LO phase has a predictable offset with respect to
external received signals, only that the two LO phases agree.
On 2016-07-05 15:26, Pavan Yedavalli wrote:
> Hi,
>
> Despite all of my boards being connected via the Octoclock (ref and pps), I
> am constantly getting different phase offsets every time I run a gnuradio
> flowgraph (or python file).
>
> I am not sure why this is happening, but I do know that I need to call one of
> the functions, set_time_now() and/or set_time_unknown_pps(), to make sure all
> of them are synced. Which one am I supposed to call? I have been calling
> set_time_unknown_pps(), but I am getting the above/below problem with that,
> so maybe set_time_now() could be correct?
>
> In general, I don't understand why I continually get a different random phase
> offset of all of the radios after every new flowgraph run. Shouldn't this
> offset be the same if I continue to transmit at the same frequency? Would one
> of the above functions fix that?
>
> Hopefully that is clear. Thank you so much for the help.
>
> --
>
> Pavan
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