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The design of all-solid-state radar transmitters for satisfactory performance in trans-lunar space or on the lunar surface poses many problems, the solution of which provides beneficial fallout for other applications. This paper discusses the design considerations which were combined to produce a highly reliable end sophisticated package adapted to accomplish, for a lunar excursion mission profile, the functions of velocity sensor and altimeter for a moon landing system, and of radar transmitter and transponder in a rendezvous-for-return system. The discussion covers the integrated electromechanical design of the basic unit, with typical performance parameters. Finally, packaging advances and the solution of thermal problems are described.