[EMAIL PROTECTED] said the following on 01/28/2007 06:11 PM: > Accuracy of 10mhz - a simple explanation? > > So can any one provide a link or want to try and explain to this layman what > the deal is with the accuracy spec provided by (or should I say claimed by) > the various manufactures and kits out there? > > For example my Trimble claims to have accuracy of 1.16 X 10 -12. > > I'm guessing that the exponent at the end of the spec, the higher the better? > > Just how high can you get? How high is needed to say lock a amateur > transverter to for 10 or 24 ghz?
That kind of notation is called "fractional frequency offset" and it means that the error will be less than 1.16x10e-12 Hertz (1.16 trillionths if I did the math correctly) at a nominal frequency of 1 Hertz; that error scales with frequency, so if you multiply up, that means that the signal will be 1.16 Hz off if the carrier frequency is 1 THz (1,000 GHz). An easy set of "road markers" is that 1x10e-6 is 1 Hertz at 1 MHz, and 1x10e-10 is 1 Hertz at 10 GHz. There are two main kinds of measurement that the time-nuts talk care about: frequency offset or error, and frequency stability. Measuring stability is where most of the fun is... Hope this helps. 73, John _______________________________________________ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
