[time-nuts] Any clock disturbances during the July 11solareclipse?
EWKehren at aol.com
EWKehren at aol.com
Tue Jul 13 23:06:33 UTC 2010
Thanks Ulrich
2 E -10 seems high and a straight line on a double oven is what I would
expect, looking at a month or two may tell more. Also what is the change in
ambient temperature? With Rubidiums in the less than $100 range I think it
is the best bang for a buck.
I am still waiting for the final results of the three testers of the Dual
Mixer but once it is completed I will test the combination of a M100 with a
selected HP 10811 replacing the internal Xtal Osc. and using the 60 second
loop of the HP 5061B.
Bert
In a message dated 7/13/2010 9:42:05 A.M. Eastern Daylight Time,
df6jb at ulrich-bangert.de writes:
Bert,
I am really unsure whether the drift alone should make me think that the
parts are bad. If the drift can be modelled well by the regulation loop
(and
the Z3805's software seems to do so) it can well be compesated for.
Unfortunately even here is no real expert for MTI stuff who could tell us
more about MTI stuff.
Best regards
Ulrich
> -----Ursprungliche Nachricht-----
> Von: time-nuts-bounces at febo.com
> [mailto:time-nuts-bounces at febo.com] Im Auftrag von EWKehren at aol.com
> Gesendet: Dienstag, 13. Juli 2010 14:42
> An: time-nuts at febo.com
> Betreff: Re: [time-nuts] Any clock disturbances during the
> July 11solareclipse?
>
>
> Ulrich,
> thank you for the info. I think that 2 E-10 per dayis the
> best argument
> for any Rubidium.
> Bert
>
>
> In a message dated 7/13/2010 8:05:25 A.M. Eastern Daylight Time,
> df6jb at ulrich-bangert.de writes:
>
> Bert,
>
> lacking a 3805 manual my guess is that the 3805 EFC scale
> may be considered the same as the 3801's one. Which would
> lead to the conclusion that 1 EFC unit equals roughly
> 1.0E-12 of relative frequency change of the LO.
>
> Symmetricon seems to have believed that the MTI 260 type
> double oven OCXOs in the Z3805 are superiour to the 10811
> double oven OCXOs used in the
> Z3801.
> However, even after months of being in action, their drift
> is still very high. If the above assumption is right what you
> see in the graph in general is a drift of 2.0E-10 per day. I
> do not notice any diurnal changes on the EFC due to
> day/night temperature variations which are otherwise the
> biggest environmental impact on oscillator frequency
> variations. So, despite of the drift the MTI 260 seem to be
> very "predictable" beasts which leads to holdover
> uncertainities that are mostly way below 1 microsecond for a
> 24 h interval.
>
> Best regards
> Ulrich
>
> > -----Ursprungliche Nachricht-----
> > Von: time-nuts-bounces at febo.com
> > [mailto:time-nuts-bounces at febo.com] Im Auftrag von EWKehren at aol.com
> > Gesendet: Dienstag, 13. Juli 2010 12:21
> > An: time-nuts at febo.com
> > Betreff: Re: [time-nuts] Any clock disturbances during the
> > July 11 solareclipse?
> >
> >
> > Ulrich
> > not having a 3805 can you please explain the scale.
> > Thank you
> > Bert Kehren
> >
> >
> > In a message dated 7/13/2010 6:12:47 A.M. Eastern Daylight Time,
> > df6jb at ulrich-bangert.de writes:
> >
> > Antonio,
> >
> > attached is a recording of my Z3805's EFC along July 11.
> > Times are in UTC.
> >
> > Best regards
> > Ulrich
> >
> > > -----Ursprungliche Nachricht-----
> > > Von: time-nuts-bounces at febo.com
> > > [mailto:time-nuts-bounces at febo.com] Im Auftrag von
> iovane at inwind.it
> > > Gesendet: Montag, 12. Juli 2010 22:19
> > > An: time-nuts at febo.com
> > > Betreff: [time-nuts] Any clock disturbances during the July
> > > 11 solar eclipse?
> > >
> > >
> > >
> > > Hi all,
> > >
> > > did anybody out there observe any disturbances in his clocks
> > > during (and/or
> > > before or after) the July 11 solar eclipse?
> > > (due to other duties I've been prevented from doing any tests)
> > >
> > > Thanks,
> > > Antonio I8IOV
> > >
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