. Electronic navigational aids; loran, radiobeacon, and radarbeacon systems and loran, radio-direction-finder, and radar ship equipment . MODULATOR Block Diagram of Radar PiGDEE 4-5.—Block diagram of Radar. In the receiver, which employs the superheterodyne principle, the radio energy reflected back from the target is converted into a form that may be presented visually on an indicator or scope. Since a very small amount of power is reflected by an object the receiver must amplify it many times. Because the same antenna is used for outgoing and incoming signals a method of disconnecting the re
. Electronic navigational aids; loran, radiobeacon, and radarbeacon systems and loran, radio-direction-finder, and radar ship equipment . MODULATOR Block Diagram of Radar PiGDEE 4-5.—Block diagram of Radar. In the receiver, which employs the superheterodyne principle, the radio energy reflected back from the target is converted into a form that may be presented visually on an indicator or scope. Since a very small amount of power is reflected by an object the receiver must amplify it many times. Because the same antenna is used for outgoing and incoming signals a method of disconnecting the receiver from the antenna is needed during Intervals when the transmitter is operating. Due to the rapid switching that is neces- sary, an electronic switch is used. It is the indicator of a Radar that presents the information collected in the form best adapted to efiBcient use of the equipment. The indicator commonly used in navigation is the plan-position-indicator, commonly abbreviated PPI, which presents on the scope a continuous polar picttu-e of the surrounding area. RADAR FREQUENCY BANDS The following bands are now provided in the United States for merchant marine Radar and associated beacon: Radar Beacon 10-centimeter 3000-3246 MC. 3256 MC. 5-centimeter 5460-5650 MC. 5450 MC. 3-centimeter 9320-9500 MC. 9310 MC.
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