[time-nuts] What cut do I have?

Bernd Neubig BNeubig at t-online.de
Mon Jan 28 11:47:42 EST 2013


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 oven starts at a lower frequency, which increases with warm-up
- same direction as for SC-cut crystals.

Regards

Bernd
DK1AG

-----Ursprüngliche Nachricht-----
Von: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at 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 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 <magnus at rubidium.dyndns.org>
wrote:

> 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 deviation was a little low for an AT cut.
> 
> Meanwhile, out of 22 LPROs tested, only 3 has BITE error, so 19 locks up.
Out of 4 cesiums tested, 3 locks up and one fails. Trimming needed on all.
> 
> Cheers,
> Magnus
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