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

Richard (Rick) Karlquist richard at karlquist.com
Fri Dec 7 18:52:15 EST 2007


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
> 
> 
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