In this work, we propose a novel approach for stabilizing frequency comb for stable microwave generation. This approach does not require stabilization of the offset frequency, but instead employs processing the heterodyne beats from an electro-optic comb and two continuous-wave lasers that are locked to an ultrastable compact cavity. We used a free-running laser and electro-optical modulators to generate a 10 GHz frequency comb spanning over 1.3 THz, matching the frequency separation of the CW lasers. Servo control of the 10 GHz modulation frequency reduces the 10 GHz phase noise to -140 dBc/Hz phase noise at 10 kHz offset frequency. At the same time, the 10 GHz signals show frequency instability at the 10^(-13) level at integration time below 1~s. In ongoing work, we seek to implement the system using integrated laser sources, chip-scale frequency combs and millimeter-scale optical cavities.
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