. La télégraphie sans fil pratique; un livre de texte complet pour les étudiants en communication radio . r du diagramme. Figure 309, dans lequel apparaît une 298 PRATIQUE DE TÉLÉGRAPHIE SANS FIL. Disposition complète de la station de réception à Koko Head montrant les posi-tions relatives de l'antenne d'équilibrage, l'emplacement des bâtiments, etc. Il est à noter que l'antenne d'équilibrage est de 5,700 pieds de longueur, Et est organisé pour être favorable à l'absorption d'énergie des deux stations de transmission de Kahuku. Parce qu'il est duplexé pour la transmission simultanée de messages au Japon et aux États-Unis
1633 x 1531 px | 27,7 x 25,9 cm | 10,9 x 10,2 inches | 150dpi
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. Practical wireless telegraphy; a complete text book for students of radio communication . r from the diagram. Fig. 309, wherein a 298 PRACTICAL WIRELESS TELEGRAPHY. complete lay-out of the receiving station at Koko Head appears showing the relative posi-tions of the balancing out aerial, the location of buildings, etc. It is to be noted that thebalancing out aerial is 5, 700 feet in length, and is arranged to be favorable for the absorp-tion of energy from the two transmitting stations at Kahuku. Because it is duplexed for the simultaneous transmission of messages to Japan and theUnited States, especial interest attaches to the Marconi station at Kahuku, Island of Oahu, Hawaiian Islands. Not only is this station fitted with two 300 kilowatt transmitting sets buta third emergency set has been installed as well, which in event of breakdown can be con-nected either to the Japan or the United States aerial. The general layout of the antennae and buildings at Kahuku is shown in the diagram, Fig. 310, wherein it will be noted, that the free end of these aerials point in a direction. RECEIVING STATION Koko Heao ISLAN O €>r O AHU Fig. 309—Plan and General Layout of the Receiving Aerials at Koko Head, Hawaiian Islands. favorable for the particular continent with which communication is to be established, beingdesignated as the Japan aerial and the San Francisco aerial. From the power house as a center, the California transmitting aerial extends southwest-ward, supported by twelve masts, 325 feet in height; the Japan aerial extends to the south-east, supported by fourteen masts, 475 feet in height. These masts are the largest that havebeen yet constructed on the Marconi system of sectional cylinders. The power house con-sists of boiler room, engine room and condenser room. The boilers are oil-fired and willfeed three 500 H. P. turbines, which drive the special 300 K. W. alternators and Marconidisc discharger. The necessary condenser capacity for all three transmitting se
