Rick Karlquist wrote: > A more practical offshoot of this concept is to subsample the > 32 kHz oscillator at 128 Hz (ie a sampling phase detector) and use a slow > loop to tune the 32768 kHz oscillator. The biggest problem here is that > you have to have a tunable oscillator. Attempting to get around > this by injection locking a non-tunable oscillator is probably not > going to work very well, since the frequency tolerance is likely > to be larger than the small amount of frequency pulling you can > get with injection locking. Basically, if the oscillator tolerance > is 0.01%, and it has a Q of >>10,000, it will be hit or miss depending > on luck. > > Rick N6RK > The drawback of all injection locked oscillator schemes is that the injection locked oscillator needs to be tunable. However a simple trimmer cap may suffice if the temperature excursion of the oscillator isnt too large and the occasional readjustment to compensate for aging is acceptable.
Bruce _______________________________________________ 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.
