[time-nuts] Efratom LPRO Rubidium
hmurray at megapathdsl.net
Mon Jul 7 04:22:41 EDT 2008
> The unit powers up about +200 Hz above 10 MHz (mine is modified to no
> longer put out 15 MHz). After 30 minutes it has dropped slowly to +150
> Hz. It briefly shows an online indication then. But a few minutes
> later that goes off and the fault light comes on. The frequency drops
> as low as +129 Hz as things continue to heat up. A couple of days
> later its still in the +129 ~+149 Hz range. I can heat and cool it and
> move the frequency ( +157 Hz at 90°F inside the Lucent box, +129Hz at
> 110°F), so the loop definitely isn't in control.
My LPRO is 4 or 5 milli Hz high. I can't see any changes with temperature
and my setup swings through 15 F p-p during most days.
That's with the electrical tuning open and no adjustments to the mechanical
I couldn't find any specs for the mechanical or electrical tuning range in
the data sheet. Has anybody measured it?
These are my opinions, not necessarily my employer's. I hate spam.
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