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

EWKehren at aol.com EWKehren at aol.com
Tue Jul 13 19:06:33 EDT 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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