Frank, My suggestion would be to try injection locking, rather than a PLL. No change is made to the 22MHz and 42MHz oscillators, except to find a way to inject enough reference power to force them to lock to it. Injection locking works well with modest harmonic relationships, and gives good noise performance. The injection can be via a coupling link, or even at the cold end of an existing bypass capacitor. Narrow pulses often work best.
I am confident that you could lock 22MHz to a 2MHz injection (divided from your 10MHz reference) if the 2MHz pulse was narrow enough and the 22MHz oscillator sufficiently stable. 42MHz is more of a challenge - you might need a double-step, such as first locking 7MHz to 1MHz from the reference, and using that to lock 42MHz. The literature on injection locked oscillators is quite limited. You get very interesting results as the lock drops out! 73, Murray ZL1BPU _______________________________________________ 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.
