[time-nuts] Method for comparing oscillators

[WB6BNQ]

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: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] 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
>
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