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: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] 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. > > > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > https://www.febo.com/cgi-> bin/mailman/listinfo/time-nuts > and > follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
