Hi Joe, Another BEER will take cared of that !
Bill....WB6BNQ "J. L. Trantham" wrote: > I have done this and I am not sure I can tell the 'direction of rotation'. > I can easily tell if it reverses but once going, I can't tell which > direction. > > Joe > > -----Original Message----- > From: [email protected] [mailto:[email protected]] On > Behalf Of J. Forster > Sent: Monday, August 03, 2009 11:14 AM > To: Discussion of precise time and frequency measurement > Subject: Re: [time-nuts] Method for comparing oscillators > > Rather than using a scope in Y-T mode (with triggered sweep) I find that > using a scope in X-Y mode makes it much easier to compare frequencies. Doing > this, you essentially get a synchroscope display. If the two waveforms are > sinusoidal, the trace will be a circle, the rate of revolution is the > frequency difference, the direction of rotation tells you which frequency is > high/low. > > FWIW, > -John > > ======= > > > John, > > > [snip] > > Your oscilloscope method (without proper handling of phase > > ambiguities) measures a compound of both properties and is not well > > suited for stability measurements. [snip > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
