[time-nuts] How To Measure Long Term Phase Stability Of An Oscillator

[Bob Camp]

Hi

All you really need to do is to measure the frequency stability to the ppt level. There's no real need to measure phase noise.

Bob

On Sep 22, 2013, at 8:01 AM, W3KL <w3kl at w3kl.com> wrote:

> Magnus. Thanks.  If I understand, this reduces to a measurement of frequency
> stability along a measurement of phase noise?
> 
> Jeff
> 
> -----Original Message-----
> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
> Behalf Of Magnus Danielson
> Sent: Sunday, September 22, 2013 7:47 AM
> To: time-nuts at febo.com
> Subject: Re: [time-nuts] How To Measure Long Term Phase Stability Of An
> Oscillator
> 
> On 09/22/2013 01:30 PM, W3KL wrote:
>> How does one make a measurement of the phase stability of an 
>> oscillator over a time period much larger than the oscillator period?  
>> For example, I have an oscillator with a frequency of 4 MHz and I want 
>> to measure the phase drift of the RF between a given point in time and 
>> then a time 4 seconds later.  I want to make a measurement that has a 
>> precision of 0.1 degree or better.
> You want to measure a drift of 4/(4E6*3600) = 278 ps. You systematic
> frequency error can be at maximum 1.39E-10 relative, For your noise side
> look at TDEV at tau of 4 s, multiply that number by at least three and it
> should when added with peak frequency error be below 278 ps.
> 
> Cheers,
> Magnus
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