Which reference did you use to time your measurements? On Fri, Dec 28, 2012 at 9:32 PM, Tom Holmes <thol...@woh.rr.com> wrote:
> 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: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@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@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 > 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, cdel...@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 > > > > > > _______________________________________________ > > > time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to > > > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > > > and follow the instructions there. > > > > _______________________________________________ > > time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to > > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > > and follow the instructions there. > > > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.