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	Eng ID	Term	Definition
	4201	radiobeacon buoy	See BUOY.
	4202	radio bearing	See BEARING.
	4203	radiocommunications	Any TELECOMMUNICATION by means of RADIO WAVES.
	4204	radio compass	See RADIO DIRECTION FINDER.
	4205	radio direction finder	Radio receiving equipment which determines the direction of arrival of a SIGNAL by measuring the ORIENTATION of the WAVE FRONT or of the mag... more Radio receiving equipment which determines the direction of arrival of a SIGNAL by measuring the ORIENTATION of the WAVE FRONT or of the magnetic or electric vector. Radio direction finders may be either manual or automatic. Also called direction finder. Formerly called radio compass.
	4206	radio direction finding (or finder) station	A RADIO STATION intended to determine only the direction of other stations by means of transmission from the latter.
	4207	radio fog signal	See FOG SIGNAL.
	4208	radio frequency	See FREQUENCY.
	4209	radio horizon	The line at which direct RAYS from a transmitting ANTENNA become tangent to the EARTH's surface. Its distance from the transmitting ANTENNA ... more The line at which direct RAYS from a transmitting ANTENNA become tangent to the EARTH's surface. Its distance from the transmitting ANTENNA is greater than that of the visible HORIZON, and increases with decreasing FREQUENCY.
	4210	radiolocation	Determination of POSITION or of a LINE OF POSITION by means of radio equipment. See NAVIGATION: ELECTRONIC.
	4211	radio mast	A tower, pole, or other structure for elevating an ANTENNA.
	4212	radiometer	An instrument for measuring the intensity of RADIANT ENERGY.
	4213	radio navigation	See NAVIGATION: ELECTRONIC.
	4214	radio navigational warning	See NAVIGATIONAL WARNING.
	4215	radio range	A radio facility the emissions of which are intended to provide a definite course guidance.
	4216	radio range station	A radio navigation land station in the aeronautical radio navigation service providing radio EQUISIGNAL ZONES. In certain instances a radio ... more A radio navigation land station in the aeronautical radio navigation service providing radio EQUISIGNAL ZONES. In certain instances a radio range station may be placed aboard a ship.
	4217	radio receiver	Equipment for receiving radio signals and converting them into usable form.
	4218	radio signals: list of	See LIST OF RADIO SIGNALS.
	4219	radiosonde	Instrument carried through the ATMOSPHERE, equipped with devices permitting one or several meteorological elements (pressure, temperatur... more Instrument carried through the ATMOSPHERE, equipped with devices permitting one or several meteorological elements (pressure, temperature, humidity, etc.) to be determined, and provided with a RADIO TRANSMITTER for sending this information.
	4220	radio sonobuoy	See SONOBUOY.
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