[time-nuts] problem with Trimble Mini-T

[Erik Kaashoek]

While evaluating a Trimble Mini-T GPSDO it appears the 10 MHz output 
frequency,  with loop control enabled, is jumping up/down every second 
or so in the order of 5e-10Â  (green trace in attached image) resulting 
in a 0.1 s ADEV of 8e-11.
In holdover mode (no GPS input and no PPS output) the output frequency 
has a much better short term stability  (purple trace in attached image) 
resulting in a 0.1 s ADEV of 5e-12
The time constant was set to 100s and the damping factor to 1. The 
Mini-T was powered by a linear bench supply.
The DOCXO used has reference has a 0.1s - 10 s ADEV of at most 5e-12.
Is there anything in the tuning that can reduce the jumps or is this to 
be expected from a Mini-T?
Erik.
-------------- next part --------------
A non-text attachment was scrubbed...
Name: DOCXOvsMini-T.png
Type: image/png
Size: 89411 bytes
Desc: not available
URL: <http://febo.com/pipermail/time-nuts_lists.febo.com/attachments/20231104/8534a35e/attachment.png>