Abstract: A radar system and method of cooling same. In the illustrative embodiment, the inventive system includes a radar array comprising a circuit board; a plurality of radiating elements printed on the circuit board; and a plurality of transmit and receive modules disposed on the circuit board in communication with the radiating elements. In a specific implementation, the invention further includes means for cooling the T/R modules. In the preferred embodiment, the modules are spray cooled. A particularly novel aspect of the invention is the provision of a mechanism for physically, electrically and hydraulically interconnecting the T/R modules or modules. The physical interconnect is achieved by rails mounted on the top bottom covers and sides of the circuit boards. The rails allow for the modules to be dovetailed together and thereby secured against vertical and lateral stresses.