xpyttl wrote:
Is there some magic to using the 72 MHz oscillator? Gigahertz synthesizers
are cheap and simple these days. Back in the bad old days multiplication
was the cheap and easy way to get stable high frequencies. Today, that
helical resonator would probably buy the synthesizer chip and associated
support circuitry, and you needn't fiddle around with stage after stage.

I just wanted to do it with existing bits.
Alan