Those 32KHz watch crystals are very flat in the vicinity of the turnover. They
don't age well. But if all you need is temperature stability and you can
correct for aging a nice little electric heat pump (heats and cools) to keep
the crystals at around the 25C inflection point might be
Hi
Any crystal in the vicinity of turnover point is going to be pretty flat. That
relates directly to the way turnover is defined. There are some exceptions
(10811), but the vast majority of OCXO designs operate the crystal very near
the turnover point. The whole chill it down approach was
-Ursprüngliche Nachricht-
Von: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] Im
Auftrag von Bob Camp
Gesendet: Montag, 28. Januar 2013 03:39
An: Discussion of precise time and frequency measurement
Betreff: Re: [time-nuts] What cut do I have?
Hi
It could also be an AT, IT or FC
: Monday, January 28, 2013 11:48 AM
To: 'Discussion of precise time and frequency measurement'
Subject: Re: [time-nuts] What cut do I have?
Hi,
IT and FC cut crystals are not very often used in OCXO. But if, then the
lower turn point is used (below the inflection temperature), which means
that the cold
Auftrag von Bob Camp
Gesendet: Montag, 28. Januar 2013 18:40
An: 'Discussion of precise time and frequency measurement'
Betreff: Re: [time-nuts] What cut do I have?
Hi
The only time I've seen them used in OCXO's both the FC and IT were run on
the upper turn (just like an AT). Thus the frequency goes
-
Von: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] Im
Auftrag von Bob Camp
Gesendet: Montag, 28. Januar 2013 18:40
An: 'Discussion of precise time and frequency measurement'
Betreff: Re: [time-nuts] What cut do I have?
Hi
The only time I've seen them used in OCXO's both the FC
] On
Behalf Of Bernd Neubig
Sent: Monday, January 28, 2013 11:48 AM
To: 'Discussion of precise time and frequency measurement'
Subject: Re: [time-nuts] What cut do I have?
Hi,
IT and FC cut crystals are not very often used in OCXO. But if, then the
lower turn point is used (below the inflection
[mailto:time-nuts-boun...@febo.com] Im
Auftrag von Bob Camp
Gesendet: Montag, 28. Januar 2013 18:40
An: 'Discussion of precise time and frequency measurement'
Betreff: Re: [time-nuts] What cut do I have?
Hi
The only time I've seen them used in OCXO's both the FC and IT were run on
the upper turn
If you meant to say the frequency starts out too high when the oven is
cold, then I think it's AT cut.
Ed
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On 01/28/2013 01:01 AM, Ed Breya wrote:
If you meant to say the frequency starts out too high when the oven is
cold, then I think it's AT cut.
OK. I looked at the previous posts and it was not very clear from them,
and I was too lazy/busy to heat up an idel AT OCXO. I just felt the
+41.4 ppm
Hi
It could also be an AT, IT or FC cut. A lot depends on just how hot the oven is
running. Best bet is indeed AT.
Bob
On Jan 27, 2013, at 7:40 PM, Magnus Danielson mag...@rubidium.dyndns.org
wrote:
On 01/28/2013 01:01 AM, Ed Breya wrote:
If you meant to say the frequency starts out too
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