[time-nuts] ADEV vs MDEV

WarrenS warrensjmail-one at yahoo.com
Sat Feb 6 23:55:45 UTC 2010

>"An ADEV noise floor of 1E-13 isn't likely when using an HP10811A as the 
>VCXO for example."

How quickly one forgets and gets lost on these long topics.
>> "If you accept that the measurement is going to limited by the  Reference 
>> Osc,
>> for Low COST and SIMPLE,  Can't beat a simple analog version of  NIST's 
>> "Tight Phase-Lock Loop" "

And which method are you saying is NOT limited by the Reference Osc??
Correct, not going to get to 1e-13 at one sec with a HP10811A,
nor likely with any other Ref Osc that most Freq nuts have.
SO Seems like that is GOOD enough noise floor limit to use for a "low cost & 
simple" configuration.

A well setup "Tight Phase-Lock Loop" method will go below that..
and a good HP 10811A can go below 1e-12 at 0.1 sec. (at a bandwidth of 30 


Bruce Griffiths said:

>The noise of the OCXO used as a VCXO will limit the noise floor.
>An ADEV noise floor of 1E-13 isnt likely when using an HP10811A as the
>VCXO for example.


*****  Original Topic *************
>> I would appreciate any comments or observations on this topic.
>> My motivation is to discover the simplest scheme for making
>> stability measurements at this performance level; this is NOT
>> even close to the state-of-the-art, but can still be useful.
>> Pete Rawson

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