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World's Most Powerful Radio Transmitter^ Built for Navy by RCA^ is Dedicated A RADIO message flashing from a giant antenna strung across a deep valley in the Cascade Mountains of Washington State circled the world on November 17, 1953, to bring all of the far-flung elements of the United States Navy within direct and instant reach of their homeland. The historic message signalled the entry into the nation's service of the most powerful radio transmitter ever built — a 1,200,000-watt station erected by the Radio Corporation of America for the U. S. Navy in the remote Jim Creek Valley some 55 miles northeast of Seattle. Tapped out in wireless code by Brig. General David Sarnoff, Chairman of the Board of RCA, the dedi- cation message as dictated by Admiral Robert B. Carney, Chief of Naval Operations, gave dramatic proof of the station's power as it penetrated to vessels in distant seas and to shore stations on the five continents. Brig. General David Sarnoff taps out first message from Jim Creek to naval units around the world as Admiral Robert B. Carney looks on. '"With this first message we forge another link be- tween you and your homeland," Admiral Carney told the scattered units. "With it, we build a new security chan- nel from America to the naval units which form its outer ramparts of defense." Six minutes later the acknowledgments began to re- turn, some of them relayed four or five stages to reach Jim Creek Valley. The first came from the battleship Wisconsin, operating off Japan. Then came word from the carrier Yorktown, the destroyer Vloyd B. Parks and the submarine Bluegill in the western Pacific; the sub- marine Sahlewish in the North Atlantic and the cruiser Pittsburgh in the South Atlantic; the carrier Tarawa in the Mediterranean and the destroyer Charles S. Sperry in Florida waters. As the replies arrived, Admiral Carney and General Sarnoff plotted the location of the units on a world map set up for the ceremony at the transmitter site. Along with the acknowledgments from the naval units, RCA Communications relayed word of receipt of the message at distant locations in its 65-n:tion radio circuit and aboard passenger liners at sea. Project Took Six Years To Cotnplete The ceremony marked formal acceptance of the powerful transmitter by the Navy from RCA, whose engineers and communications experts had worked for six years with Navy engineers to complete the $14,000,000 project. The result of their labor, put to its first test with the initial message, is a transmitter at least twenty-two times more powerful than the strongest com- mercial station in the country, emanating a very low frequency CVLF) signal capable of penetrating the magnetic disturbances that interrupt higher frequency communications and able even to reach through water to make contact with submarines cruising below the surface. Turning the installation over to Admiral Carney, General Sarnoff said: "No branch of the armed services has been more closely associated with RCA than the Navy; none has teamed with us more intimately in devising and produc- ing electronic implements of defense. None, certainly, has based its existence more completely on the science of communications, which we pursue. rad;o age 17