. Electronic navigational aids; loran, radiobeacon, and radarbeacon systems and loran, radio-direction-finder, and radar ship equipment . Figure 3-4.—PPI scope showing azimuth indication obtained from Ramark station. adjustment by relatively untechnical personnel, and with facilities for auto- matic change-over to a spare equipment in event of failure of the operating one. Figure 3-5 shows an X-band (3-cm.) Ramark transmitter. Power output requirements are extremely modest; present models radiate about 15 watts on the S-band, and Vz watt on the X-band. Even these low powers will deliver to the
. Electronic navigational aids; loran, radiobeacon, and radarbeacon systems and loran, radio-direction-finder, and radar ship equipment . Figure 3-4.—PPI scope showing azimuth indication obtained from Ramark station. adjustment by relatively untechnical personnel, and with facilities for auto- matic change-over to a spare equipment in event of failure of the operating one. Figure 3-5 shows an X-band (3-cm.) Ramark transmitter. Power output requirements are extremely modest; present models radiate about 15 watts on the S-band, and Vz watt on the X-band. Even these low powers will deliver to the navigator's Radar receiver a stronger signal than the best of echoes from its own transmitter. The optimum power output for a Ramark is still somewhat problematical, but it would appear that the final choice will lie somewhere within these limits. A magnetron is used for the S-band 10-cm. RP power source while a standard reflex klystron is used for 3-cm. equipment. In the development work to date, however, there have been certain prob- lems. One is that of obtaining an equipment of construction sufficiently reliable to permit unattended operation. It is understandable, at this stage of progress in the microwave portion of the frequency spectrum, that this should be true. Solution of this problem would appear to lie simply in the general progress of the techniques in the microwave field. In the meantime the equipment will probably continue to require more technical supervision than might be desirable, but this should grow progressively less. No means is provided at present for distinguishing between Ramarks, such as a coded signal characteristic. This is primarily due to the fact that only one or two stations will be operated in a given locality, and therefore these should be readily distinguishable by their relation to other objects. Should
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