SpectraDynamics, Inc. (SDI) is a Colorado, USA-based company specializing in high-performance instrumentation for time and frequency applications. SpectraDynamics new product is a cold Rubidium microwave atomic clock (cRb-Clock). Other products include microwave and low noise frequency synthesizers, low noise frequency distribution amplifiers, and optical to RF synthesizers. SpectraDynamics conducts research and development of technology to provide the low noise electronics needed to support atomic time and frequency standards. Our customers include National Time and Frequency Laboratories, Government Agencies, Universities, Department of Defense Contractors, and Telecommunications Companies.