[time-nuts] Need schoolin PPM vs E to the umth?

John Franke jmfranke at cox.net
Wed Dec 31 16:07:29 UTC 2008


1 PPM is one part per million or 1 X 10^-6.  An uncertainty of 1 PPM for a 
frequency of 1 MHz would mean an uncertainty of 1 Hz.  At 3.5 MHz, the 
uncertainty would be 3.5 Hz.  An accuracy of 1 X 10^-10 is 10,000, or 10^4, 
times better than 1 X 10^-6. 1 X 10^-10 is equivalent to 0.0001 PPM.

John WA4WDL

----- Original Message ----- 
From: <n3izn at aol.com>
To: <time-nuts at febo.com>
Sent: Wednesday, December 31, 2008 10:56 AM
Subject: [time-nuts] Need schoolin PPM vs E to the umth?


> So can any one bring it down a few clicks and explain the accuracy thing 
> to this balding hippie?
>
> I'm leaning towards ham radio applications. GPSDO are rated in one way 
> like 1 X 10 to something. Ham radios are coming with "High Stability" 
> oscillators that are rated in ? PPM.
>
> In laymen's terms what do those numbers mean and how do they relate to 
> each other?
>
> Hope this doesn't start to much controversy on the board.
>
> 73
> Chris
>
>
>
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