[time-nuts] Super stable BVA Quartz resonators... BVA??

[Didier Juges]

I looked at the HP 10811 specification and I do not see Frequency Jumps as a
specified parameter. 

I know what it is, I have read the (very interesting) papers and postings on
this group about it and I understand it is one of the more difficult to
avoid and hardest to predict cause of error in crystal oscillators. Yet, it
does not seem to be adequately covered in specifications.

Is it covered in other spec requirements such as phase noise or short term
stability? But since these also encompass other causes, how can I tell which
is which? If phase noise or short term stability encompasses frequency
jumps, how can I estimate the size of frequency jumps from those
specifications?

Didier 

> -----Original Message-----
> From: time-nuts-bounces at febo.com 
> [mailto:time-nuts-bounces at febo.com] On Behalf Of Richard 
> (Rick) Karlquist
> Sent: Friday, December 07, 2007 5:52 PM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] Super stable BVA Quartz resonators... BVA??
> 
> Having low aging is nice, but the real problem is frequency 
> jumps.  Do we know that they are the best in that respect?  
> If a crystal can jump 1E-10, then that represents 10 days of 
> aging all at once.
> 
> Rick Karlquist, N6RK
> 
> Didier Juges wrote:
> > I am not aware of other crystal oscillators with better 
> performance, 
> > so either I am missing something (the more likely explanation) or 
> > there is something to it.
> > 
> > Maybe the cut is simply a smoke screen and the outstanding 
> performance 
> > is actually due to other process detail(s) not disclosed?
> > 
> > Or maybe their oscillators are not that good, they just blow smoke 
> > really well.
> > 
> > Didier KO4BB
> > 
> >> -----Original Message-----
> >> From: time-nuts-bounces at febo.com
> >> [mailto:time-nuts-bounces at febo.com] On Behalf Of Richard
> >> (Rick) Karlquist
> >> Sent: Friday, December 07, 2007 10:45 AM
> >> To: Discussion of precise time and frequency measurement
> >> Subject: Re: [time-nuts] Super stable BVA Quartz 
> resonators... BVA??
> >>
> >> Reminds me of the "SC" cut crystal.
> >> It either means "Stress Compensated" or "Santa Clara", 
> where it was 
> >> discovered :-)
> >>
> >> The BVA has been around for a long time and you would 
> think that if 
> >> there was really something to it, everybody would be 
> making them.  Of 
> >> course, they are very difficult to make.
> >>
> >> Rick Karlquist N6RK
> > 
> > 
> > _______________________________________________
> > time-nuts mailing list -- time-nuts at febo.com To unsubscribe, go to 
> > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> > and follow the instructions there.
> > 
> > 
> 
> _______________________________________________
> time-nuts mailing list -- time-nuts at febo.com To unsubscribe, 
> go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.