Electromagnetic frequencies in the range below 3 kilohertz to 300 gigahertz. This includes radio and television transmission. These frequencies are above audio signals and below visible light frequencies.
A connector used in RF applications.
Radio frequency signals that escape from the transmission line system.
See Radio Frequency Interference.
See Radio Guide.
The military designation for coaxial cable. "G/U" stands for general utility.
Rubber insulated, heat resistant building wire. 90° C.
Rubber insulated, twin conductor, heat resistant, fibrous covered wire.
Same as RHD, except lead covered.
A two terminal, variable resistor, used to vary current. A potentiometer of high wattage, usually higher than four watts, with only two of the three terminals used.
Same as RH but with lead sheath.
Rubber insulated multiple conductors. Heat resistant and fibrous covered.
Same as RHM, but with lead cover.
Designation for rubber insulated, heat and moisture resistant building wire, 75° C dry, 60° C wet.
Greek letter used to represent the ratio of reflected voltage measurement to the initial or launch voltage (Reflection Coefficient).
Flat cable with conductors that have been individually insulated together. Structure is usually characterized by individual colors of insulation for each conductor, although a single color may be used for all conductors.
An edge connector in which the plug is mounted to a chassis or back panel and the receptacle is mounted along an edge of, and soldered to, the circuits of a printed circuit board.
See also Edge Connector.
An inexpensive solderless terminal that is crimped to the end of a conductor and is frequently used at the terminal end of conductors from grounding wires to high-voltage cables.
Round-end tongue terminal with a hole to accommodate a screw or stud.
The process of locating or identifying specific conductive paths by means of passing current through selected conductors.
The residual and undesired AC component that is superimposed on the DC output of a power supply.
A measurement of the time required for a signal waveform to rise from logic "0" , or a low level (measured at 10 % max voltage level Vo) to a logic "1" or high level (measured at 90% max voltage level Vo).
Rise time is also known as "Signal Rise Time." The reverse of rise time is Signal Fall Time, which occors when the voltage change is opposite to the above, i.e., from max to low. Fourier time-frequency domain analysis shows a short signal rise time (or equivalently a sharp signal waveform edge or a very small inverse slope or inverse slew rate of (t/V) evaluated over the total signal voltage swing), to be rich in high frequency components that constitute the original waveform when super-imposed over each other (in the time-domain).
See also Signal Edge, Fall Time, Slew Rate.
See Connector Rise Time.
The vertical space through which vertical cable passes.
Vertical cable that carries wire pairs to the floors of a high-rise building. Used in applications for indoor cables that pass between floors. It is normally used in a vertical shaft or space.
Rubber insulated, jute covered cable.
Rubber insulated cable, flat band armor.
Rubber insulated cable, interlock armor.
Rubber insulated cable, lead sheath.
Rubber insulated cable, lead, jute, flat band armor, and overall jute covering.
Rubber insulated cable, lead jute, steel wire armor, and overall jute covering.
Rubber-insulated multiple conductors.
Rosin Mildly Activated solder flux. A flux formulated to be less chemically aggressive than fully activated flux but efficient enough to clean and enhance solder wettability; and equally as important, may be cured and then left permanently as a harmless residue on a circuit board, thus eliminating a cleaning operation process step.
Rubber-insulated multiple conductors.
See Root Mean Square.
A switch that is actuated by a lever pivoted at its center with two flat faces angled with the panel in which the switch is mounted.
A number derived from the net increase in depth of impression as the load on a penetrator is increased from a fixed minimum load to a higher load and then returned to minimum load. Penetrators include steel balls of several specified diameters and a diamond-cone penetrator.
Read Only Memory. A permanently programmed semiconductor memory device that can read out data repeatedly and whose contents cannot be changed.
The effective DC current or DC voltage of alternating current or voltage having a similar I2R rate of irreversible energy dissipation via heat.
A conductor composed of a center group of twisted strands surrounded by layers of twisted strands.
The mildest and least effective of solder fluxes. To increase rosin flux efficiency, small amounts of organic activating agents are added. Type RA, or fully activated rosin flux, is the flux most commonly used for electrical connections.
A switch assembled on a central shaft and actuated by manual rotation of the shaft.
The torque required to rotate a switch through its various positions.
A cable made with parallel round conductors in the same plane.
Round Conductor Ribbon Cable (RCRC)
Known in the industry as planar cable.
The total path of a reflected signal which is twice the real path (in electrical length terms; time) due to the total path of transmission and reflection of the signal.
An active LAN/WAN device that forwards packets between multiple LANs, based on an address table. Usually routers are capable of translating packets between the protocols of different types of LAN/WAN.
Performance grade rubber insulation, 60° C.
Rubber insulation neoprene jacket.
Designation for rubber insulated building wire, heat and moisture resistant, 75° C dry or wet.
Integral rubber insulation and jacket on single conductor cables.
The RS standards are established by the Electronics Industries Association (EIA). The EIA is a national trade association representing the full scope of electronics manufacturing, from the simplest part to the most complex system. Engineering standardization is one of the key functions of the EIA and RS232, RS442, and RS449 are some of the standard established for I/O communications.
Resistor Transistor Logic. One of the earliest forms of semiconductor logic in which the basic logic element is a resistor-transistor network.
Rubber insulated, latex building wire. 60° C.
A general term used to describe insulations made of mildly thermosetting elastomers, i.e., mildly cross-linked elastomers, such as natural or synthetic rubbers, neoprene, hypalon, butyl rubber and others.
A signal connector designed to provide the features and withstand the physical abuse normally associated with physically larger power connectors.
Same as RU, heat-resistant, 75° C.
The track in an injection molding machine through which melted plastic flows from the machine nozzle to the cavity in which the part is to be molded. Runner solidifies with the part and becomes waste. Some of it can be recovered and reused as a material called regrind.
The weight of the runner of the mold and is allocated to the number of parts being molded at the same time.
