[time-nuts] Unknown Efratom 10MHz Assy, information asked

[Hal Murray]

> Underneath the top board I found the 15 MHz crystal filter.

Assume I have 10 MHz and want 15.

How does the output through a crystal filter compare with that from an 
oscillator using the same crystal and a PLL?

I'd guess it's doing something like making a 5 MHz square wave and filtering 
out everything but the 3rd harmonic.

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