Quote Originally Posted by RossWaddell View Post
Maybe a 20 Mhz crystal oscillator with capacitors is the way to go?

"Crystals provide accurate timing to within 50 parts per million (PPM)"

If that's true, then that's better than a resonator with 0.5 % accuracy.
To repeat my earlier post, you will NEVER get them to stay locked in phase using 2 different oscillators - this really is oscillators 101. You are simply wasting your time trying, it is not fundamentally possible. One needs a reference from the other, it's just that simple. There are many ways to do this, including the examples already given.