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: <n3...@aol.com> To: <time-nuts@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 > > > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.