Hi The normal term for a gizmo that multiplies and then mixes down is an error multiplier. They were a very common lab item back when I had more hair than I do now.. Various people made them in the 1950's and 1960's.
Bob On Jan 10, 2011, at 9:35 PM, Perry Sandeen wrote: > List, > > While comparing oscillators at 10 GHz might work for some it is indeed a > daunting challenge at the very least. > > I would like to propose what may be cheaper and more readily achieved method > for Comparing 10 MHz Oscillators by more of us time-nuts. (This is still > theoretical) > > What I propose is this: > > Make two separate, but exactly the same, circuits, one for the reference and > the other for the unknown to be measured. They would be located parallel to > each on a circuit board. > > The input would be divided by a decade counter giving us a 1 MHz signal. > Then we use this signal to phase lock the oscillator section of a CD 4046 to > 10MHz. The 10 MHz signal goes into one port of a LM 1496 double balanced > mixer. The other input would be from a reasonably stable 9 MHz oscillator. > Taking the DBM output into a simple low pass filter we use that 1MHz signal > to phase lock the next CD 4046 oscillator to 10 MHz. Then we start the whole > process again. > > At any point we chose along the chain or at the end we feed both 10 Mhz > signals into a single CD 4046 or similar phase detector and obtain our > offset. > > Since each set of circuits is fed with the same 9 MHz subtraction oscillator, > any deviation of its performance is cancelled. > > The required chips are inexpensive and these frequencies are far more > manageable than microwaves. > > Constructive criticism? Comments? Improvements? > > Regards, > > Perrier > > > > > > _______________________________________________ > 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.