Hi....
I'm doing it. I've taken PRS-10 which has PPS IN feature and fed it with PPS
from Trimble. It is still work in progress but the mechanism works. Time
constant of the PRS-10 is set to very long time (8 hours?) from factory when
signal is present on PPS-10.
Problem I'm encountering is that I get precise time by the nature of Trimble
but Adev worsens. This is because PPS of T-bolt has more jitter than stability
of PRS-10 itself. While PRS-10 is still providing stable signal, T-bolt pushes
and pulls. Also, lock is achieved in few minutes but to truly synchronize, it
takes weeks. It contradicts what I just said but push and pull is more like a
nudge, so initial synchronization takes forever.
PPS IN pin on PRS-10 is dual purpose. You must make sure a jumper is set
correctly, or it won't work. My finding is that PPS from GPSDO works much
better than just GPS, and this is because raw PPS from JUST GPS does not enjoy
pre-processing. GPSDO's PPS is regenerated by steered signal, and not direct
from satellites.
It is an interesting experiment. Getting it to work was easy. Getting it to
work well, I'm still working on it.
---------------------------------------
(Mr.) Taka Kamiya
KB4EMF / ex JF2DKG
On Monday, March 2, 2020, 1:21:16 AM EST, mp...@clanbaker.org
<mp...@clanbaker.org> wrote:
Hello, Time-Nutters--
Is it possible to add/combine/mate a rubidium osc to a Trimble
Thunderbolt GPSDO?
Have there been any examples of this that I could use as a guide?
Thanks for any info/feedback on this!!
Mike Baker
Gainesville/Micanopy
Florida USA
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