See: http://en.wikipedia.org/wiki/Crystal_oscillator
BVA resonator (Boîtier à Vieillissement Amélioré, Enclosure with Improved
Aging), developed in 1976; the parts that influence the vibrations are
machined from a single crystal (which reduces the mounting stress), and the
electrodes are deposited not on the resonator itself but on inner sides of
two condenser discs made of adjacent slices of the quartz from the same bar,
forming a three-layer sandwich with no stress between the electrodes and the
vibrating element. The gap between the electrodes and the resonator act as
two small series capacitors, making the crystal less sensitive to circuit
influences.
John WA4WDL
--------------------------------------------------
From: "Ron Ward" <n6idl...@comcast.net>
Sent: Wednesday, September 19, 2012 1:30 PM
To: "'Discussion of precise time and frequency measurement'"
<time-nuts@febo.com>
Subject: Re: [time-nuts] HP-106 and Sulzer Quartz Crystals
Hi:
What does BVA stand for?
What is a blue top?
Are HP 10811 "Blue Stripe Replacement" Quarts Oscillators just junk?
What was HP's Blue Stripe Replacement program about?
Thanks,
Ron
-----Original Message-----
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Tom Knox
Sent: Wednesday, September 19, 2012 8:38 AM
To: Time-Nuts
Subject: Re: [time-nuts] HP-106 and Sulzer Quartz Crystals
Hi Bob;
Quartz is of course and art so generally speaking the BVA is great very
close in, but at 1Hz they do not have much if any better performance. And
further out the Wenzel's noise floor is about 20dB below the BVA . Factor
in
that the Blue Top cost(appr $6000) is about 1/4 of a BVA (appr$25000) and
it
seems almost cheap. I response to an eariler question I think corning
makes
most of HP's 10811 era and Wenzel Blanks. I wish I could find a couple
Blue
Tops at a reasonable price. and while I am at it I wish I could also find
a
Beach House in New Zealand for cheap.
Thomas Knox
From: li...@rtty.us
To: time-nuts@febo.com
Date: Wed, 19 Sep 2012 10:56:44 -0400
Subject: Re: [time-nuts] HP-106 and Sulzer Quartz Crystals
Hi
For a time standard crystal, the real question is "how much room do you
have?". If volume / power / cost is not a concern, there are a lot of
ways
you could go. The market has moved away from the big old beasts mainly
because people simply don't have the room for them any more.
That said, a BVA running on a 5th overtone at about 1 MHz in a 4" or so
glass bottle likely would do pretty well. I suspect you could get a batch
made for around $1M.
Bob
-----Original Message-----
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Tom Knox
Sent: Wednesday, September 19, 2012 10:47 AM
To: Time-Nuts
Subject: Re: [time-nuts] HP-106 and Sulzer Quartz Crystals
Ron;
I think the Wenzel Blue Tops are very good.
Thomas Knox
> From: n6idl...@comcast.net
> To: time-nuts@febo.com
> Date: Tue, 18 Sep 2012 22:31:25 -0700
> Subject: [time-nuts] HP-106 and Sulzer Quartz Crystals
>
> Hi:
>
> Does anyone know who made the crystal for the HP-106 and / or Sulzer
> oscillators?
>
>
>
> Is Bliley Electric Company still in business? They use to sell a 5th
> overtone precision quartz crystal for "frequency standard" use.
>
>
>
> Where could you find the ultimate crystal today for a frequency
standard?
>
>
>
> Thanks,
>
> Ron
>
>
>
> _______________________________________________
> time-nuts mailing list -- time-nuts@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@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@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@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@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@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
