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

EWKehren at aol.com EWKehren at aol.com
Tue Jul 13 08:41:45 EDT 2010


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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