http://www.diyphysics.com/2012/02/14/d-i-y-10-mhz-atomic-clock-frequency-standard-using-surplus-rubidium-oscillator/
or http://www.diyphysics.com/2012/02/19/d-i-y-gps-disciplined-10-mhz-frequency-standard-gps-based-universal-time-clock/ 73,Patrick AF5CK
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