[time-nuts] Holdover

Azelio Boriani azelio.boriani at gmail.com
Wed Aug 17 04:06:48 EDT 2016

...the Z3801A requires the device to be in holdover... with the GPS
PPS already acquired: I think that the "jam sync" must be done against
some reference...

On Wed, Aug 17, 2016 at 4:49 AM, Mark Sims <holrum at hotmail.com> wrote:
> The Trimble GPSDOs and most of the SCPI ones (like the Z3801A) have "jam sync" commands that force the receiver to do an immediate time sync (the Z3801A requires the device to be in holdover before it will accept a jam sync).  Some also have commands where you an also specify thresholds where the receiver alarms and/or does an automatic jam sync and thresholds for loss-of-signal time before the device goes into holdover mode.
> -------------------
> I have selected a somewhat more intricate setup in which you can set a
> re-assignment limit, so when the phase error is outside of that limit,
> you turn the output off, jumps the phase difference, and then starts to
> track in from there. The reason being that at some time deviation, the
> time it takes to track in the phase error is too large to be practical
> so turning of and jump has less impact.
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