. Electronic navigational aids; loran, radiobeacon, and radarbeacon systems and loran, radio-direction-finder, and radar ship equipment. Loran; Radar. 14 OCEAN ELECTRONIC NAVIGATIONAL AIDS operating the Loran transmitter and similar timing piilses for other secondary station functions. Some idea of the high degree of precision of the Loran timer equipments may be illustrated by the fact that a pocket watch of comparable accuracy would run for a period of over 9^/2 years before it would lose or gain a single second of time. A third item of equipment which is of fundamental importance in a trans
. Electronic navigational aids; loran, radiobeacon, and radarbeacon systems and loran, radio-direction-finder, and radar ship equipment. Loran; Radar. 14 OCEAN ELECTRONIC NAVIGATIONAL AIDS operating the Loran transmitter and similar timing piilses for other secondary station functions. Some idea of the high degree of precision of the Loran timer equipments may be illustrated by the fact that a pocket watch of comparable accuracy would run for a period of over 9^/2 years before it would lose or gain a single second of time. A third item of equipment which is of fundamental importance in a trans- mitting station is the Loran switch gear. This is constructed as a separate physical unit and contains the necessary switching equipment to permit the operator to place different units of the station equipment in use by properly connecting them to the other units. The switch gear chassis also houses the "attenuator" unit, an electronic switch which effectively disconnects the. Figure 1-12.—Loran station—men on watch at the timing equipment. receiver unit each time the local transmitter sends out a signal. It is neces- sary to do this to prevent the receiver from being damaged by the strong signal that is generated in the vicinity of the station's own transmitting antenna. During the interval when the local transmitter is not sending out a signal, the "attenuator" reconnects the receiver to permit the operator to receive the signal from the distant station. In order to provide reliable Loran service even in the case of minor failures of equipment it is the established practice in equipping Loran stations to provide duplicate units of all of the major items. In this manner an equip- ment failure causes only a momentary pause in the service, since the stand-by equipment can usually be placed in service in less than a minute's time. Figures 1-10, 1-11, and 1-12 illustrate transmitting station equipment and installation layout plan. LORAN SYSTEM DESCRIPTION
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