The DRL family of microwave radio systems is a new range of standard modular equipment developed by TRT to operate in five frequency bands for the setup of medium-capacity local and regional radio-relay networks. These systems comply with the latest CCIR recommendations and ETSI standards and are distinguished by their high signal quality in a disturbed radio environment. They incorporate the most recent technological advances, in particular as regards high-scale integration, the use of microwave printed circuits and transmission quality management.