BTW: I proudly own a HP2801A plus two crystal sensor elements. However I
cannot connect them to the instrument, because the 2801A has a special
connector for it. It looks like a smaller version of a BNC connector,
but the bayonet has three "nipples" instead of two. Does anyone on the
list
Chuck Harris wrote:
> Bruce Griffiths wrote:
>
>> Bernd T-Online wrote:
>>
>
>
>>> Bi-convex contours are more difficult to manufacture, as it is required
>>> that the symmetry axis of the upper and lower contour must coincide.
>>> Also other parameters become worse. For the BVA the ma
Bruce Griffiths wrote:
> Bernd T-Online wrote:
>> Bi-convex contours are more difficult to manufacture, as it is required
>> that the symmetry axis of the upper and lower contour must coincide.
>> Also other parameters become worse. For the BVA the manufacturability
>> would also be much worse
Bernd T-Online wrote:
> Hal Murray wrote:
> > Why is the top domed? I assume flat would be easier to manufacture.
>
>> Why is it not symmetrical? If the top is domed, why not the bottom too?
>>
> For a plano-parallel qaurtz resonator the diameter must be at least 60
> times larger than
From: Bernd T-Online <[EMAIL PROTECTED]>
Subject: Re: [time-nuts] Super stable BVA Quartz resonators... BVA??
Date: Sat, 08 Dec 2007 09:27:28 +0100
Message-ID: <[EMAIL PROTECTED]>
> Hal Murray wrote:
> > Why is the top domed? I assume flat would be easier to manufactu
Bernd T-Online wrote:
> Hal Murray wrote:
> > Why is the top domed? I assume flat would be easier to manufacture.
>
>> Why is it not symmetrical? If the top is domed, why not the bottom too?
>>
> For a plano-parallel qaurtz resonator the diameter must be at least 60
> times larger than
Hal Murray wrote:
> Why is the top domed? I assume flat would be easier to manufacture.
> Why is it not symmetrical? If the top is domed, why not the bottom too?
For a plano-parallel qaurtz resonator the diameter must be at least 60
times larger than the thickness, otherwise the vibration ampl
At 17.58 09/12/2007, Bernd wrote:
>Thanks, Marco. I have the unit in my QRL lab, so I can take a photo only
>by tomorrow.
Ok, good. There are triax connectors with three and two bayonets
around - ask Keithley... they have used both types.
Or it may be something else, HI.
73 - Marco IK1ODO / A
Yes, I know... I was only exposing it as an example of how the
temperature coefficient can be quite higher compared with the aging
effect even if the quartz crystal is not intended to be used as a
temperature sensor :)
Regards,
Javier
Bernd T-Online escribió:
> Javier wrote:
>
>> Anyway, a
Marco IK1ODO wrote:
> may you send me a picture of the connector?
> Direct email
Thanks, Marco. I have the unit in my QRL lab, so I can take a photo only
by tomorrow.
Regards
Bernd
DK1AG
___
time-nuts mailing list -- time-nuts@febo.com
To unsubscri
Yes, but that doesn't account for this part of his request
(emphasis added):
"It looks like a *smaller* version of a BNC connector,
but the bayonet has three "nipples" instead of two."
-Chuck Harris
Alan Melia wrote:
> Berndt I believe you are describing a "Triax" connector I found them thr
-
From: "Bernd T-Online" <[EMAIL PROTECTED]>
To: "Discussion of precise time and frequency measurement"
Sent: Sunday, December 09, 2007 2:21 PM
Subject: Re: [time-nuts] Super stable BVA Quartz resonators... BVA??
> Tim Shoppa wrote:
> > For a while, didn&#x
> -Original Message-
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] On Behalf Of Bernd T-Online
> Sent: Sunday, December 09, 2007 8:44 AM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] Super stable BVA Quartz resonators
DK1AG wrote:
>... the 2801A has a special
>connector for it. It looks like a smaller version of a BNC connector,
>but the bayonet has three "nipples" instead of two. Does anyone on the
>list know what kind of connector that is and where to get the
>counterpart (plug)?
>
>Regards
>
>Bernd
>DK1AG
B
Javier wrote:
> Anyway, a 10544 oscillator has a cold
> offset that can easily be of 1000Hz, so if at 80 deg. C the offset is
> zero, and at 25 deg. C the offset is 1000Hz, you easily have a rough
> 15Hz/deg C average tempco in that range - and the aging drift for this
> oscillator is quite les
Tim Shoppa wrote:
> For a while, didn't HP sell temperature probes which were in fact
> quartz crystals? Oscillation frequency was converted by some simple
> electronics to a temperature, and at the time (60's?) they were
> exquisitely convenient for measuring way better than a tenth of a
> degree.
Javier <[EMAIL PROTECTED]> wrote:
> Tim Shoppa escribi?:
> > For a while, didn't HP sell temperature probes which were in fact
> > quartz crystals? Oscillation frequency was converted by some simple
> > electronics to a temperature, and at the time (60's?) they were
> > exquisitely convenient for m
Tim Shoppa escribió:
> For a while, didn't HP sell temperature probes which were in fact
> quartz crystals? Oscillation frequency was converted by some simple
> electronics to a temperature, and at the time (60's?) they were
> exquisitely convenient for measuring way better than a tenth of a
> degr
Bernd T-Online <[EMAIL PROTECTED]> wrote:
> I can confirm Rick's statement, that there is no noticable effect of
> aging on the turnover temperature (TOT).
> Looking at it from physics standpoint, frequncy aging is mainly caused
> by minor changes of vibrating mass and/or by changes in elastic
Poul-Henning Kamp wrote:
> You got me wondering: How is the TOT determined ? Is it per unit
> or is it per batch ? How precisely does an OCXO hold the temperature
> on the TOT ?
For crystals used in precision OCXO the TOT is measured and recorded per
unit.
There are two main methods: passive an
In message <[EMAIL PROTECTED]>, Bernd T-Online writes:
>Jeff Mock wrote:
>I can confirm Rick's statement, that there is no noticable effect of
>aging on the turnover temperature (TOT).
You got me wondering: How is the TOT determined ? Is it per unit
or is it per batch ? How precisely does an
Jeff Mock wrote:
> How does crystal aging look on a graph of temp versus frequency
> What does this graph look like as a crystal ages? Does the optimal
> operating temperature change over time, that is, does the graph tend to
> move left and right, or does aging tend to move the graph vertic
We did a lot of characterization of crystal temp
vs freq in the E1938 development and never observed
any "aging" of these curves. Even on "green" crystals
with zero run time.
Rick Karlquist N6RK
Jeff Mock wrote:
> Thanks for the description, it is very interesting. I have a follow up
> questio
Thanks for the description, it is very interesting. I have a follow up
question if you don't mind.
How does crystal aging look on a graph of temp versus frequency. This
graph has some temperature point where the slope of frequency variation
goes to zero and the crystal is quite stable around
Hal Murray wrote:
> [EMAIL PROTECTED] said:
>
>
>> The key points which yield the BVA's improved aging are, that - the
>> whole resonator package is made from quartz, consisting of the
>> resonationg quartz plate in the middle section and the two mounting &
>> sealing plaates on top and bottem -
[EMAIL PROTECTED] said:
> The key points which yield the BVA's improved aging are, that - the
> whole resonator package is made from quartz, consisting of the
> resonationg quartz plate in the middle section and the two mounting &
> sealing plaates on top and bottem - you may call it a Hamburger
:56 PM
> To: time-nuts@febo.com; [EMAIL PROTECTED]
> Subject: Re: [time-nuts] Super stable BVA Quartz resonators... BVA??
>
> From: "Richard (Rick) Karlquist" <[EMAIL PROTECTED]>
> Subject: Re: [time-nuts] Super stable BVA Quartz resonators... BVA??
> Date: Fri, 07
e-nuts@febo.com; [EMAIL PROTECTED]
> Subject: Re: [time-nuts] Super stable BVA Quartz resonators... BVA??
>
> From: "Richard (Rick) Karlquist" <[EMAIL PROTECTED]>
> Subject: Re: [time-nuts] Super stable BVA Quartz resonators... BVA??
> Date: Fri, 07 Dec 2007 17:28:15 -08
From: "Richard (Rick) Karlquist" <[EMAIL PROTECTED]>
Subject: Re: [time-nuts] Super stable BVA Quartz resonators... BVA??
Date: Fri, 07 Dec 2007 17:28:15 -0800
Message-ID: <[EMAIL PROTECTED]>
Rick,
> Coincidentally, I just learned today that the
> E1983A is still
Coincidentally, I just learned today that the
E1983A is still being made by an OEM called
Scotts Valley Magnetics.
Rick Karlquist N6RK
Magnus Danielson wrote:
>
> Is the E1938 commercially available? If not, is there a followup?
>
> Cheers,
> Magnus
>
___
ED]
>> [mailto:[EMAIL PROTECTED] 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??
>>
>&
John Ackermann N8UR wrote:
> The option -008, ... is about $14K. I'm told the yield
> of those is about a dozen per year, and the lead time to get one is
> around six months.
Hmm, not quite long enough to save up, then!
Changing the subject slightly, does anyone know the Thomson-CSF
PMT P5-1E ?
on 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 th
Brian Styles said the following on 12/07/2007 07:15 PM:
> There's quite a bit of guff on the "Oscilloquartz" website - especially
> if you find your way to the OXCO 8607-B datasheet (pdf).
[ . . . ]
> They've made over 10,000 of them. Anyone know what they're charging...?
Very rough numbers, b
> Boîtier à Vieillissement Amélioré
>
This is another version,
Enrico
Enrico Rubiola
professor of electronics
web:http://rubiola.org
e-mail: [EMAIL PROTECTED]
FEMTO-ST Institute
32 av. de l'Observatoire
25044 Besancon, FRANCE
voice: +33(0)381.853940 (E.Rubiola)
voice: +33(0)381.853999
Didier Juges wrote:
> Maybe the cut is simply a smoke screen and the outstanding performance
> is actually due to other process detail(s) not disclosed?
There's quite a bit of guff on the "Oscilloquartz" website - especially
if you find your way to the OXCO 8607-B datasheet (pdf).
I'm not qua
BVA is a French acronym, it means
Besson Vieillissement Amelioré
Reymond Besson is the scientist who invented it, here in Besancon,
a friend of mine, officially retired, yet still at work.
"Vieillissement" means aging,
"Amelioré" means improved.
Somebody says that it also means "Besson vieux âne",
From: "Didier Juges" <[EMAIL PROTECTED]>
Subject: Re: [time-nuts] Super stable BVA Quartz resonators... BVA??
Date: Fri, 7 Dec 2007 17:17:59 -0600
Message-ID: <[EMAIL PROTECTED]>
> I am not aware of other crystal oscillators with better performance, so
> either I 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
>&g
f 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
frequency measurement
> Subject: Re: [time-nuts] Super stable BVA Quartz resonators... BVA??
>
> A googlized translation is:
>
> Improved Housing for Aging
>
> -Chuck Harris
>
> John Franke wrote:
> > Try:
> >
> > Boîtier à Vieillissement Amélioré
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.
ussion of precise time and frequency measurement"
>
> Sent: Friday, December 07, 2007 11:20 AM
> Subject: Re: [time-nuts] Super stable BVA Quartz resonators... BVA??
>
>
>> Michael Baker wrote:
>>
>>> I have found out how a BVA
Try:
Boîtier à Vieillissement Amélioré
John WA4WDL
- Original Message -
From: "John Ackermann N8UR" <[EMAIL PROTECTED]>
To: "Discussion of precise time and frequency measurement"
Sent: Friday, December 07, 2007 11:20 AM
Subject: Re: [time-nuts] Super st
Michael Baker wrote:
> I have found out how a BVA resonator is fabricated, but
> I have not discovered what the acronym "BVA" stands for.
>
> I suspect that the "B" in "BVA" may refer to Raymond Besson
> the discoverer of the BVA quartz resonator, but I
> have not been able to confirm that.
>
>
Hello, All--
In doing some reading to educate myself on the relative
short and long-term stability characteristics of the best
grade quartz resonators, I find that BVA cut resonators
are on the leading edge of quartz crystal technology.
I have found out how a BVA resonator is fabricated, but
I ha
46 matches
Mail list logo
