[time-nuts] Any clock disturbances during the July11solareclipse?

[Bob Camp]

Hi

The 260 in my z3805 also has a very linear drift plot. Mine is positive, but
otherwise a lot like the one you show. The plot in both cases indeed
remarkably linear. That makes you wonder just what the mechanism is. 

Since they market the 260 as a "rubidium replacement" it is indeed
surprising that the aging does not level off a bit more.

Bob 

-----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 9:42 AM
To: 'Discussion of precise time and frequency measurement'
Subject: Re: [time-nuts] Any clock disturbances during the
July11solareclipse?

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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