The Rubidium Atomic Frequency Standard (RAFS) from Excelitas Technologies is a Space-Qualified Atomic Clock with an output frequency of 13.4 MHz and a maximum frequency stability of 2x10-12 (at 1 sec). It has a phase noise of -95 dBc and a return loss of greater than 20 dB. This atomic clock has harmonics of 50 dBc and a spurious signal range of -85 to -50 dBc. It requires a DC supply voltage of 28 V and has a power dissipation of up to 14 W. The atomic clock has a mass of 14 lbs and measures 5 x 8.5 x 6 inches. It is ideal for Global Navigation Satellite Systems (GNSS) applications.