Hi,
Have you looked at the delay of the GPS signal passing through the
filter to the one unit vs C on the other?
I've seen a similar situation where a bias T was the culprit. I don't
recall the numbers off hand but it was significant enough to notice, and
the difference went away once the T removed (or duplicated on the other
device).
Dan
On 5/1/2022 3:30 AM, time-nuts-requ...@lists.febo.com wrote:
Some more info
The two GPS do keep their phase stable vs a Rb within ±10 ns. But the
absolute time difference of their PPS pulses was, after a cold start,
stable within ± 20ns but the average value could be up to 100ns and
differed after every cold start.
The two GPS antenna cables had a length difference of 1 meter, but that
should cater for only 5 ns (?) One module is connected to the antenna with
only a C, the other has a 1 GHz CLC high pass filter between antenna and
module
Erik
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