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 EM79 > -----Original Message----- > From: [email protected] [mailto:[email protected]] On > Behalf Of John Ackermann N8UR > Sent: Friday, December 28, 2012 3:20 PM > To: Discussion of precise time and frequency measurement > Cc: [email protected] > 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 a DBM > and using the resulting 10 MHz, so I'm really curious to see how this works out. > Seems like injection locking is the most likely problem you'd have to deal with. > > Let us know how this goes! > > John > > On Dec 28, 2012, at 2:12 PM, [email protected] 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 > > > > _______________________________________________ > > 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.
