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The most important training involved the latest American breakthrough in communications technology: a handheld, portable, two-way radio transceiver that made ground-to-air communications possible for the first time. A predecessor of the mobile telephone, the equipment had been designed at the RCA electronics laboratories in New York before being refined and developed for the OSS by De Witt R. Goddard and Lieutenant Commander Stephen H. Simpson. The device would eventually become known as a “walkie-talkie,” but at the time of its invention this pioneering gizmo went by a more cumbersome and quaint title: the “Joan-Eleanor system.” “Joan” was the name for the handheld transmitter carried by the agent in the field, six inches long and weighing three pounds, with a collapsible antenna; “Eleanor” referred to the larger airborne transceiver carried on an aircraft flying overhead at a prearranged time. Goddard’s wife was named Eleanor, and Joan, a major in the Women’s Army Corps, was Simpson’s girlfriend. The Joan-Eleanor (J-E) system operated at frequencies above 250 MHz, far higher than the Germans could monitor. This prototype VHF (very high frequency) radio enabled the users to communicate for up to twenty minutes in plain speech, cutting out the need for Morse code, encryption, and the sort of complex radio training Ursula had undergone. The words of the spy on the ground were picked up and taped on a wire recorder by an operator housed in a special oxygen-fed compartment in the fuselage of an adapted high-speed de Havilland Mosquito bomber flying at over twenty-five thousand feet, outside the range of German anti-aircraft artillery. An intelligence officer aboard the circling aircraft could communicate directly with the agent below. As a system of communication from behind enemy lines, the J-E was unprecedented, undetectable by the enemy, easy to use, and so secret that it would not be declassified until 1976.
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