[time-nuts] HP 10544A Repair

[Magnus Danielson]

Jim,

Why cut it open? It is relatively easy to measure just by power the 
oscillator up. Just in this thread is an echo of a discussion we had 
many years ago that explains the method.

The temperature curve for AT, BT and SC-cut is known and quite 
different, so just measure the heat-up curve from room temperature to 
oven temperature will be distinct for these types. I think the IT-cut 
can also be identified uniquely this way.

If you have the crystal blank, you can use X-ray to see the 
crystal-orientation.

Cheers,
Magnus

On 02/28/2016 05:48 PM, jimlux wrote:
> On 2/28/16 6:23 AM, Bob Camp wrote:
>> Hi
>>
>> The whole “BT Cut” issue was a big top secret in HP. They spent a lot
>> of time obscuring
>> the fact that they used BT’s. The belief was that if any of the other
>> outfits figured out that
>> was what they were doing, the competition would have better OCXO’s.
>>
>
>
> Can you tell what the cut is if you have the blank in front of you?
>
> Wouldn't the competition just buy an instrument with the oscillator, saw
> it open, and measure it?
>
>
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