The results of the use of a microprocessor as the stabilizing portion of a spread spectrum synthesizer are reported. The uses of spread spectrum techniques are discussed and then various modulation schemes and synthesis processes are considered. To produce a wideband, flexible modulator, a hybrid direct sequence/frequency-hopping synthesizer was designed. The critical wideband spreading function is created by the frequency hopping portion, so this was the part of the system which was built. The effects of environmental changes, such as temperature variations and power supply fluctuations were studied and the ability of a microprocessor to counteract these effects was investigated. The results of these experiments show that a microprocessor can control the post-tuning drift caused by these various effects.