[time-nuts] The Nature of Noise

Bob Camp kb8tq at n1k.org
Thu Jun 30 17:27:35 EDT 2016


Hi

If you are measuring noise, then C is the bad one in the group. If you are measuring something else, then it is 
possible that you are getting bad information. This is a classic argument about comparing devices from the 
same lot of parts. They might both have a very similar warmup curve or temperature or pressure coefficient. 

Bob

> On Jun 30, 2016, at 2:30 PM, Bob Stewart <bob at evoria.net> wrote:
> 
> With my recent Cs problems, I've been wondering about the subject of noise generation and measurement.  Specifically, my question is this:  Let's say that I have 3 disciplined oscillators: A, B, and C.  So, I use the same 5370 to create a 1000 second ADEV and discover that the 1s noise value between A and B is low, while the 1s noise between A and C, as well as B and C is high.  Can I then say that both A and B are low noise devices?  Or is it possible that even though I'm measuring 1000 points, both A and B are high noise devices, but somehow are noisy in the same exact way, and it's actually C that's the low noise oscillator?
> 
> Bob - AE6RV -----------------------------------------------------------------------------------
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