US-Japan Radiotelephone Circuit, 1935

JapanOperatorSix years before the attack on Pearl Harbor, radiotelephone service was inaugurated between the United States and Japan. Shown here is Chiduko Kashiwagi, the Japanese telephone operator at the Tokyo end of the circuit. The radio link was between the transmitting stations at Dixon, California, and the receiving station at Komuro, Japan. The signals going the other way went from Nazaki, Japan, to Pt. Reyes, California. The control points were located at San Francisco and Tokyo, from which points the signals were linked to the respective national telephone networks.

JapanRXTo ensure secrecy, the signals were scrambled. The Komuro receiving station is depicted here. The U.S. transmitting station at Pt. Reyes had a signal of about 20,000 watts.

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