[time-nuts] Morion MV89 output level?
jmiles at pop.net
Thu Feb 9 23:06:25 UTC 2012
> One question: I was thinking about buying one of these MV89As. Are
> they the best of the $25 OCXOs for short to medium term phase
> noise/stabilty. Trimble, Isotherm and others are all about the same
> price on eBay. How to decide which to get?
The MV89As are DOCXOs, not just OCXOs. They are capable of great
medium-term performance, in the mid E-13s at 10000 seconds for one part I
measured (attached). Note that this is uncorrected for drift or temperature
or anything else! You don't often see this kind of stability in a surplus
OCXO that's selling in quantity for around $50 each.
They do have relatively high phase noise and AM noise beyond 10 Hz, though.
In the world of eBay-special OCXOs, what the Trimble oscillators do for
broadband phase noise, the MV89As do for stability. If you need good
performance near 1 Hz and superb performance beyond 1 kHz, then you should
cannibalize a Thunderbolt for its OCXO. If you don't care about broadband
noise beyond 100 Hz, but need very low noise near 1 Hz and/or exceptionally
good stability on an hour-to-hour basis, you may find the MV89A to be a good
way to go.
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