[time-nuts] GPS 1 PPS accuracy limits

life speed life_speed at yahoo.com
Wed Apr 21 15:37:24 UTC 2010

Date: Tue, 20 Apr 2010 18:59:20 -0700
From: jimlux <jimlux at earthlink.net>
Subject: Re: [time-nuts] GPS 1 PPS accuracy limits

>Do they have other requirements (Allan deviation? phase noise?)
>Over what time span do they want 4E-11 accuracy? 1 second, 1000 seconds, 
>A synthesizer locked to a Stanford Research PRS10 (datasheet accuracy 
>5E-11) is in that ballpark.

They have phase noise requirements, which aren't achievable for the price they want to pay.  But phase noise is determined by the OCXO and other circuitry.

I suspect the most likely answer is they wrote the spec wrong, and don't really mean 1 Hz absolute accuracy.  I'll talk to them and clarify.


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