Bruce & Rex, You're both right. 1.25E-10 was for 40.000 000 005 GHz and 7.5E-11 is for 40.000 000 003 GHz. My bad, Good sleuthing.
Tom Tom Duckworth 510-886-1396 -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Rex Sent: Wednesday, April 02, 2008 3:01 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Racal-Dana 1992 switches Bruce Griffiths wrote: > Tom Duckworth wrote: > >> Bill, >> >> I have attached a PDF of two methods we used at XL Microwave for adjusting >> the internal reference oscillators in our microwave counters. The second >> method (digital) was used to calibrate the internal reference time base of a >> 70 GHz microwave counter with an accuracy of parts in E-11. >> >> This digital method could be used to compare two GPSDOs, one to the other, >> and would probably yield greater resolution than trying to use a phase >> measurement on a counter due to jitter, internal noise, and stability issues >> in the count chain. This method proved to be fast, simple, stable, and >> superior to other methods we tried. >> >> Hope this helps. >> >> Tom >> Tom Duckworth >> 510-886-1396 >> >> >> > Tom > > The first calculation at the bottom of the second page is incorrect the > result should be: 1.25E-10 not 7.5E-11. > > Bruce > > The result was fine, but the measurement should have been 40.000 000 003 GHz. :-) -Rex _______________________________________________ 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.