New developments in army mobile communication equipment

In 1945 the operation of vehicular and field equipments in World War II was carefully analyzed and military characteristics for a new series of vehicular equipments established. The primary improvements over World War II equipments considered necessary were: reduction in the number of crystals required; more flexibility of channel assignment; complete immersionproofing; and capability of operating from storage batteries or from hand generators and dry battery sources in the field. The new equipments developed to meet these requirements, Radio Sets AN/GRC-3 through 8, are comprised of various assemblies of a group of major standardized components. Vehicular equipments to meet various communication needs may be assembled from these components on a building block principle. Each of the components and the acoustic accessories have been made immersionproof, this much-needed protection that was found necessary to attain reliability under tropical conditions. The equipments are designed for operation over an ambient temperature range from -40°C to up to 65°C.