[time-nuts] DMTD question

Magnus Danielson magnus at rubidium.dyndns.org
Wed Jun 17 20:21:00 EDT 2009


Bruce Griffiths skrev:
> Magnus Danielson wrote:
>> Hi Corby,
>>
>>> Corby
>>>
>>> The noise contribution of the offset oscillator is incompletely canceled
>>> when the delay between the zero crossings for both channels isn't zero.
>>> The effect increases with the delay between zero crossings as your tests
>>> demonstrate.
>>> You can deduce little from the test apart from the fact that Osc 3 has
>>> worse performance than that of the other 2 oscillators.
>> I agree with Bruce, the delay removes the cross-correlation gain in
>> the suppression of the transfer oscillator. Compare the oscillators
>> pair-wise instead.
>>
>> Cheers,
>> Magnus
>>
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> Another question that arises is the stability/jitter of the 100ms delay
> itself.
> How was this 100ms delay achieved?

Indeed. The NBS DMTD system I know of doesn't have this feature.

Cheers,
Magnus




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