[time-nuts] ensemble oscillators for better stability
tholmes at woh.rr.com
Fri Dec 28 20:32:40 UTC 2012
Seems like I saw an article in QEX a year or two back where a guy did just
that, except he used a single 5 MHz oscillator and used the mixer to make a
doubler, but that isn't very much different from this.
Tom Holmes, N8ZM
Tipp City, OH
> -----Original Message-----
> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
> Behalf Of John Ackermann N8UR
> Sent: Friday, December 28, 2012 3:20 PM
> To: Discussion of precise time and frequency measurement
> Cc: time-nuts at febo.com
> Subject: Re: [time-nuts] ensemble oscillators for better stability
> Hi Corby -- I've often thought of the idea of mixing two 5 MHz sources in
> and using the resulting 10 MHz, so I'm really curious to see how this
> Seems like injection locking is the most likely problem you'd have to
> Let us know how this goes!
> On Dec 28, 2012, at 2:12 PM, cdelect at juno.com wrote:
> > Hi,
> > I've been playing around with 2 HP 5065A standards to see if averaging
> > them will give better stability.
> > The results so far are:
> > 1 sec 10 sec 100 sec
> > unitA 1.28-12 3.83-13 1.33-13
> > unitB 9.31-13 3.44-13 1.18-13
> > combined 8.95-13 3.09-13 8.95-14
> > Each unit was adjusted for equal amplitude into a resistive power
> > combiner and also adjusted so their phase was coincident prior to
> > starting the plots.
> > The main problem was getting their relative frequencies close enough
> > so that there was no drift during the measurements.
> > Not a trivial accomplishment for the 100 sec tau!
> > I'm thinking now of a way to loosely lock the phase of one unit to the
> > other to simplify the setup.
> > One different idea I had that I'd like some feedback on:
> > If I take both units into a double balanced mixer, then take the
> > resulting 10MHz and divide it back to 5MHz would I get the same
> > improvement?
> > This method would be much simpler!
> > Happy New Year!
> > Corby Dawson
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