The Dual Frequency Reference module consists of 2 Ultra-Low Phase Noise OCXOs at 10 and 100 MHz. Both are packaged in hermetically sealed metal cans. The unit at 100 MHz is phase/frequency locked to the 10 MHz one. Lower-frequency OCXOs provide excellent frequency stability over temperature, time (aging), supply, load variations, exceptionally low phase noise close to the carrier, and short-term stability (Allan Deviation). 100 MHz OCXO provides ultra-low phase noise on the noise floor and high output power.