[time-nuts] Strange 100ns jumps on Motorola M12+T
Chris Albertson
albertson.chris at gmail.com
Thu Nov 21 16:27:29 UTC 2013
On Thu, Nov 21, 2013 at 12:49 AM, Stephan Sandenbergh
<ssandenbergh at gmail.com> wrote:
...
> Using a single antenna and splitting it is an idea, but then I still need
> to devise something to inject the antenna DC power at the other end of the
> splitter etc. And, we are trying to measure the relative offset between the
> antenna/receiver pairs for calibration.
Many splitters have a DC passthrough. Even some cheap under $10
satellite TV splitters have this.
>From memory, I think you can disable the antenna supply on the Oncore,
you don't want all three GPSes trying to supply DC power.
I looked at the graph. It is such a clean jump that I doubt this is
noise at the antenna. Also it looks like 50nS of noise. Seems to
much for an MT12-T. Are they running in position hold mode? Did
you do a long enough site survey?
--
Chris Albertson
Redondo Beach, California
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