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 <b...@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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