[time-nuts] Any clock disturbances during the July 11solareclipse?

J. L. Trantham jltran at att.net
Tue Jul 13 08:10:56 EDT 2010


Ulrich,

What software do you use to monitor your 3805A and how do you connect to it?

Joe

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Ulrich Bangert
Sent: Tuesday, July 13, 2010 7:05 AM
To: 'Discussion of precise time and frequency measurement'
Subject: Re: [time-nuts] Any clock disturbances during the July
11solareclipse?


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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