. Electronic navigational aids; loran, radiobeacon, and radarbeacon systems and loran, radio-direction-finder, and radar ship equipment . Figure 3-5.—X-band Ramark transmitter. the need for coded identification of a particular beacon arise, however, this can eventually be accomplished without too much difficulty. It will be appreciated that any beacon for general use must be easily utilized by the surface navigator, and also without appreciable, and prefer- ably no, modification of the user's navigational Radar. This precludes the adoption of any of the several existing responder-type systems
. Electronic navigational aids; loran, radiobeacon, and radarbeacon systems and loran, radio-direction-finder, and radar ship equipment . Figure 3-5.—X-band Ramark transmitter. the need for coded identification of a particular beacon arise, however, this can eventually be accomplished without too much difficulty. It will be appreciated that any beacon for general use must be easily utilized by the surface navigator, and also without appreciable, and prefer- ably no, modification of the user's navigational Radar. This precludes the adoption of any of the several existing responder-type systems which require elaborate and expensive modification or auxiliary equipment before the service may be utilized. RACON An example of the responder-type beacon is the RACON, which was used extensively during the war by military aircraft. Briefly, beacons of this type transmitted only when called, or interrogated, by coded pulses from the Radar of the aircraft desiring the service of the beacon. When so interrogated, the RACON would reply by sending out a set of coded pulses which would indicate its bearing on the PPI scope of the aircraft's Radar. Also, responding bea- cons of this type provide range as well as azimuth by permitting measure- ment of the elapsed time between the triggering of the beacon and the arrival of its response pulse at the aircraft.
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