Alfredo,
Your results seem correct; it is true that most Rb have worse
short-term performance than a free-running OCXO. I think
2.5e-11 is about right.
How did you measure yours?
Yes, the TBolt OCXO is quite good, short-term. The ones sold
by TAPR (tested here by me, last year) are 1 or 2 to 3 e-12,
so all are about 10x better than your LPRO's.
Short-term frequency stability, and long-term stability, and
hold-over timekeeping, or price are all different goals; no
one oscillator meets all goals.
One question for you -- do all your 4 LPRO drift in the same
direction over time?
/tvb
I control my lpro101 with trimble thunderbolt .
now is more then one month , work good very stable .
But I am not happy , sure long time is more stable of original
thunderbolt with ocxo , sure is more stable in holdover ( we need in
holdover ? i never lost gps signal ) .
But short time is worst then original ocxo . I have 4 lpro101 , all four
have short time as datasheet near 2.5 E-11 .
Maybe I am not lucky and my all lpro are not the best in short time ,
but because my primary interest is short time , I need to drive my
spectrum analyzer and my microwave generator with clean and stable
reference , the lpro not respond to this needs .
I may send plotting at 12.8 GHz with ocxo and with lpro , there are to
much difference.
I think you need to control your LPRO only if you are interesting to
control the drift of your lpro and use it as reference only for compare
, but not for drive microwave instruments.
regards Alfredo
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