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We report observations of the Schawlow-Townes noise limit in a cryogenicsapphire secondary frequency standard. The effect causes a fundamental limit tothe frequency stability, and was measured through the novel excitation of abimodal maser oscillation of a Whispering Gallery doublet at $12.04 GHz$. Thebeat frequency of $10 kHz$ between the oscillations enabled a sensitive probefor this measurement of fractional frequency instability of$10^{-14}\tau^{-1/2}$ with only 0.5 $pW$ of output power.

Measurement of fundamental thermal noise limit in a cryogenic sapphire frequency standard using bimodal maser oscillations