"A"
"B"
"C",
"D",
"E",
"F",
"G",
"H",
"I",
"J",
"K",
"L",
"M",
"N",
"O",
"P",
"Q",
"R",
"S",
"T",
"U",
"V",
"W",
"X",
"Y",
"Z"
"R" to "Rad",
"Ran" to "Rea",
"Rec" to "Relat",
"Relay" to "Resol",
"Reson" to "Rh",
"Ri" to "Rm",
"Ro" to "Rz"
RACE CONDITION. defines a condition when a device's output depends on two or more nearly simultaneous events to occur at the input. Logic Race Conditions.
RACEWAY. A channel designed expressly for holding wires, cables, or busbars, with additional
functions as permitted in this subpart. Raceways may be of metal or insulating material, and the term
includes rigid metal conduit, rigid nonmetallic conduit, intermediate metal conduit, liquid-tight
flexible metal conduit, flexible metallic tubing, flexible metal conduit, electrical metallic tubing,
under-floor raceways, cellular concrete floor raceways, cellular metal floor raceways, surface
raceways, wireways, and busways.
Also refer to MIL-PRF-24758, for flexible weatherproof conduit.
RADAR. An acronym for RAdio Detecting And Ranging. Refer to the Dictionary of Radar Terms.
RADIATION FIELD. The electromagnetic field that radiates from an antenna and travels through space.
RADIATION LOSSES. The losses that occur when magnetic lines of force about a conductor are
projected into space as radiation and are not returned to the conductor as the cycle alternates.
RADIATION RESISTANCE. The resistance that if inserted in place of the antenna would consume the
same amount of power as that radiated by the antenna.
RADIATION, Space. Radiation from space. Refer to the Space Radiation Dictionary.
RADIO COMMUNICATIONS. The term describing teletypewriter, voice, telegraphic, and facsimile
communications.
RADIO FREQUENCY (RF). Any frequency of electromagnetic energy capable of propagation into
space. The frequencies that fall between 3 kilohertz and 300 gigahertz used for radio
communications.
RADIO FREQUENCY CARRIER SHIFT. The system that uses a keyer to shift a radio frequency signal
above or below an assigned frequency. These shifts correspond to marks and spaces.
RADIO HORIZON. The boundary beyond the natural horizon in which radio waves cannot be propagated
over the earth’s surface.
RADIO SET CONTROL UNIT. Equipment used to remotely control certain transmitter and receiver
functions.
RADIO WAVES. A form of radiant energy that can neither be seen nor felt. An electromagnetic
wave that is generated by a transmitter.
RADIX. Also called the base. The number of distinct symbols used in a number system. For example,
since the decimal number system uses ten symbols (0, 1, 2, 3, 4, 5, 6, 7, 8, 9), the radix is 10. In the
binary number system, the radix is 2 because it uses only two symbols (0, 1).
Table of Numbering Systems.
RADIX POINT. Also called BINARY POINT, OCTAL POINT, DECIMAL POINT, and so forth,
depending on the number system.
Next section of "R" Terms
