[time-nuts] Road-trip and rubidium fiddles

[Magnus Danielson]

On 04/09/2012 06:55 PM, Attila Kinali wrote:
> On Mon, 9 Apr 2012 18:40:47 +0200
> Azelio Boriani<azelio.boriani at screen.it>  wrote:
>
>>> It is clear that the short term is limited by the instrument trigger
>> jitter. A mixer pre->scaling is clearly needed.
>>
>> that is, a mixing to take down the 10MHz to a lower frequency? Mixing with
>> a higher stability source?
>
> He probably meant DMTD[1,2].
>
> 			Attila Kinali
>
> [1] "Picosecond time difference measurement system", by D.W. Allan, 1975
> [2] http://www.wriley.com/A%20Small%20DMTD%20System.pdf

Indeed. I meant DMTD.

The oldest DMTD setup I know is from the NASA special conference on 
short term stability in 1962, See NASA Special Publication 80 (SP80).
It's linked at the Wikipedia article on Allan deviation.

DMTD comes in many shapes.

Cheers,
Magnus