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Mobile Electronics Glossary of Terms and Definitions - R

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
Mobile Electronics Glossary - R
  R - Ripple, in dB
  Radio - A head unit that combines a tuner, a preamplifier, and a power-amplifier.
  Radio Frequency Interference (RFI) - Electromagnetic waves between the frequencies of 10 KHz and 300 GHz that can affect susceptible systems by conduction through sensor (tape head) or power input lines, and by radiation through space.
  RAM - Random Access Memory. A memory device that one can write data to and read data from.
  Ras - Acoustical equivalent of Rms
  Re - "This is the DC resistance of the driver measured with an ohm meter and it is often referred to as the 'DCR'. This measurement will almost always be less than the driver's nominal impedance. Consumers sometimes get concerned the Re is less than the published impedance and fear that amplifiers will be overloaded. Due to the fact that the inductance of a speaker rises with a rise in frequency, it is unlikely that the amplifier will often see the DC resistance as its load."
  Relay (SPDT) - (Single Pole Double Throw Relay) an electromagnetic switch, consist of a coil (terminals 85 & 86), 1 common terminal (30), 1 normally closed terminal (87a), and one normally open terminal (87).
  Remote Turn On Lead - The lead from the head unit which supplies a signal (12V+) to the "remote turn on" lead of the amplifier turning the amplifier on when the head unit is turned on, and allowing the amplifier to be mounted in a location out of reach of the user. This is NOT the amplifier's main source of power.
  Res - The electrical resistive equivalent of Rms, in ohms
  Resistance - The opposition to the flow of AC or DC voltage in an electric current. Measured in ohms.
  Resistor - An electrical device that resist the flow of electrical current. The higher the value of resistance (measured in ohms) the lower the current will be.
  Resonance - Pitch. When you tighten a drum, you raise it's resonance.
  Resonant Frequency - Frequency at which there is a response peak, due to a specific interaction of inductive and capacitive circuitry in an audio devise or system.
  Revc - DC voice coil resistance, in ohms
  Revc - DC voice coil resistance, in ohms
  RF Modulator - A device that converts a signal (typically audio and/or video) into a radio frequency.
  Rg - Amplifier source resistance (includes leads, crossover, etc.), in ohms
  Rg - Amplifier source resistance (includes leads, crossover, etc.), in ohms
  RKE - Remote Keyless Entry
  RMS - Root Mean Square.
  Rms - "This parameter represents the mechanical resistance of a driverís suspension losses. It is a measurement of the absorption qualities of the speaker suspension and is stated in N*sec/m." The driver's mechanical losses, in kg/s
  Roll-Off - Relates to the attenuation of frequencies, above or below a given point, at a specific rate.
  ROM - Read Only Memory. A memory device that one can only read data from. The data has been pre-programed.
  RS - Remote Starter
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
Mobile Electronics Basics:
Diodes
Glossary of Terms and Definitions
Ohm's Law
Recommended Books & DVD's
Recommended Wire Sizes
Relays
Resistors
Tools and Equipment


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