[time-nuts] OCXO Phase Noise Measurement in Primitive Conditions

Magnus Danielson magnus at rubidium.dyndns.org
Tue Sep 2 17:14:58 EDT 2014

Hi Bob,

Just realized I forgot to mention this...

As you have sawtooth data, one fun way to compare the GPS-OCXO is just 
use the sawtooth data and then let TimeLab do the phase-unwrapping on 
that. This will however not give good characterization of the stability 
of the PPS output, which is the result of the 10 MHz OCXO corrected into 
PPS-time, for that you either need to measure a reference to the OCXO or 
to the PPS.


On 09/02/2014 10:46 PM, Bob Stewart wrote:
> Hi Magnus,
> I knew I was missing something!  I'll warm up the Rb and test against that again.
> Thanks!
> Bob
> ________________________________
>   From: Magnus Danielson <magnus at rubidium.dyndns.org>
> To: time-nuts at febo.com
> Sent: Tuesday, September 2, 2014 3:27 PM
> Subject: Re: [time-nuts] OCXO Phase Noise Measurement in Primitive Conditions
> Well, in that case you do measure a form of noise-floor rather than
> measuring the OCXO performance, as OCXO performance is being corrected
> out in the PPS position (and sawtooth-correction).
> If you want to measure that OCXO performance, you need to do that
> against an independent PPS.
> Cheers,
> Magnus
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