[time-nuts] Efratom LPRO Rubidium
Ulrich Bangert
df6jb at ulrich-bangert.de
Mon Jul 7 07:41:41 EDT 2008
Hal,
> 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.
The TC of a LPRO is in the order of -7E-13 / Deg C or even less. That is
why you see no changes: They are there but a bit beyond most measurement
capabilities.
Best regards
Ulrich
> -----Ursprüngliche Nachricht-----
> Von: time-nuts-bounces at febo.com
> [mailto:time-nuts-bounces at febo.com] Im Auftrag von Hal Murray
> Gesendet: Montag, 7. Juli 2008 10:23
> An: Discussion of precise time and frequency measurement
> Betreff: Re: [time-nuts] Efratom LPRO Rubidium
>
>
>
> > 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
> tuning.
>
>
> 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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