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  1. The tiny Symmetricom atomic clock he shows doesn’t work the way he explains. It contains a gas cell about the size of a grain of rice and is interrogated by a tiny solid state laser. When the RF frequency is correct, the light from the laser dips slightly as seen by an optical pickup.

    The Cs clocks in the GPS IIF system are about the size of 2 shoe boxes and use the method he talks about, but the GPS system mainly relies on rubidium based clocks which about about the size of one shoe box and use a gas cell technique.

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