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Radio Broadcast
operated duplex to enable messages to be received at the same time other messages are being sent from the same station or unit. This is accomplished by establishing a control and receiving station at a distance of about ten or twelve miles from the transmitting stations and connecting the two stations by land wire telegraph. Radio men are posted at the transmitting stations to start and stop the machinery and to regulate the apparatus, the functioning of which for transmitting messages, however, is controlled by the operator at the central and receiving station. In practically all the Navy's high-power stations there are installed a medium-power and a low-power transmitter in addition to the high-power set. Operators at the central and receiving station may be sending out messages with the three transmitters simultaneously and other operators may receive from distant stations at the same time.
T
THE U. S. NAVY STATION AT PEKING, CH
Operated by the U. S. Marines located at the American Li pound which is within the famous 40-foot Tartar Wail.
towers are atop the wall
The naval stations in the Pacific and in Alaska would be almost completely isolated from the United States were it not for the Army's cable and the Navy's radio service. The Army's cable has deteriorated considerably with age and consequently is frequently broken. At such times the radio service takes over all cable traffic in addition to its normal traffic and passes it on to stations situated along our Pacific Coast. In the Pacific, reliance is also placed on a single cable and when this fails, the only remaining medium of communication is radio. There is no connection with American Samoa except by radio but entirely satisfactory service is maintained between Tutuila and Pearl Harbor over the Navy's radio circuit, about 2,000 words being exchanged daily.
The Navy's transpacific high-power radio circuit may be said to extend into China and temporarily at least, into Siberia. A station of 30KW power has been established within the Peking Legation Compound, surrounded by the 40-foot-high Tartar Wall, which encloses the American Legation, to prevent the American Minister from becoming isolated from the outside world when internal disorders are in progress in China. The ordinary communication facilities in China are unreliable under normal conditions and the service is frequently interrupted altogether when disorders are in progress. The Navy 's radio station at Peking has afforded the only medium of communication on more than one occasion, not only for the American Minister, but also for the other foreign diplomats in Peking. The Peking station is operated by members of the Marine detachment guarding the American Legation. This station exchanges communications with the highpower station at Cavite, with the flagship of the Asiatic Fleet, with vessels of the Yang Tse Patrol and with the station at Vladivostok.
The Navy took over from the Russian Government the then incompleted radio station at Vladivostok as a result of the dispatch of American troops to Siberia during the war. This station has since been
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