[time-nuts] Comparison of two clocks

Bob Bownes bownes at gmail.com
Wed Sep 7 23:42:49 EDT 2011

The simplest method of all would be to put one on the X axis and one
on the Y axis of an o-scope.

What levels of precision/accuracy are you looking for?

On Wed, Sep 7, 2011 at 11:36 PM, Ilja Gerhardt <ilja at cryptix.de> wrote:
> Hi time nuts -
> I am new to the list and have a trivial question on the comparison of
> two clocks: In principle it might be very easy to simply monitor the
> relative phase-shift of two sine outputs of two clocks, e.g. of two
> 10MHz outputs.
> For this, it would be ideal to have a very high frequency, such as a
> phase-locked 1GHz signal. Does anyone have a reference to a circuitry,
> which implements a phase-locked up-converted signal?
> But, I guess there are better ways to compare two clocks - I recall a
> setup where two clocks are referenced to a third, similar frequency
> signal (which might even have phase-noise and such) on two mixers. Then
> the two outcomes are compared. Does anyone have a good reference/ paper
> to a comparison of clock-comparison possibilities?
> Best Regards from the PST
>              Ilja
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