[time-nuts] 10544A vs. 10811

Magnus Danielson magnus at rubidium.dyndns.org
Sun Feb 1 17:31:46 EST 2015


As I recall it, the 10544 is a BT-cut and not AT-cut.
We discussed this a few years back, and even checked the cold 
temperature before heating up, and it matched BT-cut and not AT-cut.

Anyway, go with the 10811.

Cheers,
Magnus

On 02/01/2015 07:51 PM, Richard (Rick) Karlquist wrote:
> The other big difference is that the 10811 uses
> an SC cut crystal instead of an AT cut crystal.
>  From a cold start, the SC achieves a given stability
> much faster than an AT cut.  If you are just going
> to run the oven continuously (likely mode for time
> nuts), this isn't any big deal to you.
>
> The reason why the phase noise is better is not
> so much due to the SC cut crystal, but rather to
> the grounded base output buffer in the 10811.
>
> A 10811 is guaranteed to work in any 10544 socket
> in HP equipment.  They had to do this so that they
> could stop making 10544's as soon as the 10811 was
> introduced.
>
> Rick Karlquist N6RK
>
> On 2/1/2015 12:54 AM, Bruce Griffiths wrote:
>> Since the 10544A uses a PWM oven controller there are significant oven
>> PWM frequency related sidebands.The PN noise floor of the 10811A
>> (-160dBc/Hz) is significantly lower than that of the 10544A (-145dBc/Hz).
>> Bruce
>>
>>
>>       On Sunday, 1 February 2015 2:57 PM, Bill <bill at hsmicrowave.com>
>> wrote:
>>
>>
>>   I have a choice. Can I assume the 10811 is the better OCXO for phase
>> noise and ADEV compared with the 10544A?
>>
>> Thanks and regards...Bill
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