The Model SM6218 Fast Synthesizer, with frequency modulation capability, was developed as an enhancement to the existing Series SF60 1 usec, CW synthesizer family. It offers a higher performance and cost effective alternative to signal generators currently used in various applications such as test systems, and especially those which require improved frequency accuracy, phase noise, and frequency modulation capabilities. In addition, the Model SM6128 design allows the flexibility to customize performance to specific application requirements. For military applications, this synthesizer requires option G09 to comply with military standards. The specific environmental MIL STD requirements, as well as the EMI/RFI specifications, should be provided by the customer.