Include

[CrEaTrE]

R

Radar Sensor A common name for a type of spatial sensor.2

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Radio Frequency (RF) An alternating current or voltage with a frequency above about 100kHz. It's called radio frequency because these frequencies are radiated as electromagnetic waves by radio ( and now television) stations.4

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Range (Audio) Usually described as frequency range, this is a system's frequency transmission limits, beyond which the frequency is attenuated below a specified tolerance. Also, the frequency band or bands within which a receiver or component is designed to operate.2

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Range (Security) The term used to quantify the maximum operating distance that can exist between a vehicle and the remote control transmitter. Range is usually expressed in feet or yards.2

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Rarefaction A state or region of minimum pressure in a medium traversed by compressional waves (sound waves).2

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Receiver A device designed to receive a signal or command from a source such as a transmitter.2

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Rectification A conversionof Alternation Current (AC) into Direct Current (DC) by means of a rectifier.4

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Relay An electromagnetic switch that allows small, relatively low level signals to operate higher amperage devices. Also used when polarity reversal ins necessary.2

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Remote A common name for the remote control transmitter used with a remote security system (Also see Transmitter).2

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Remote Start The feature where a security system of accessory module allows the vehicle operator to start the engine of a vehicle using a remote transmitter without actually being inside the vehicle.2

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Reset The ability of a security system to automatically stop sounding the siren and return to an armed state after being triggered, as long as no further trigger conditions are present.2

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Resistance The electrical term used to describe the property that various materials possess to restrict or inhibit the flow of electricity. Electrical resistance is relatively low in most metals and relatively high in most nonmetallic substances. Electrical resistance is measured in ohms.2

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Resonance The term used to describe the tendency of objects to vibrate at certain frequencies. This can be a useful or undesirable effect, as in planned enclosure or driver resonance, or as in unplanned enclosure resonance or wall resonance.2

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Resonant Frequency The frequency at which a speaker cone vibrates the easiest-the point at which it has the most amplitude.4

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Retriggering See Alarm Retriggering.2

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RF Modulator A device that converts a signal (typically audio and/or video) into a radio frequency.1

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RF Package An add-on audio system comprised of a CD or MD changer, a CD controller, and an RF modulator. Used to add CD or MD playback ability to virtually any car radio.1

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RGB Transfer Video signal broken down into separate Red, Green and Blue components, and transferred as such.1

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Ripple (Amplifier) A train of pulses that occurs when AC is changed to DC via a rectifier. These pulses are left on the DC.4

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Ripple (Speaker) The maximum deviation from flat response, measured in decibels-it indicates the port's effect on woofer output.4

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RMS Root Mean Square.2

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Roll-Off Relates to the attenuation of frequencies, above or below a given point, at a specific rate.2

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Roof-Mount Antenna A permanently-installed antenna located in the center of the vehicle's roof.2

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Rotary Commander Also called driver's remote. An ancillary control interface providing intuitive and safe operation of a car stereo by keeping your eyes on the road.3

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Rotary Encoder A digital control which emulates the function of a "big round volume knob". Also controls additional preamp functions.1

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Rotary Lever A control arm providing easy access to the Seek and AMS functions, positioned beside the rotary encoder.1

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Rotary Scan Head A magnetic pick-up head, typically used in VCR's and DAT machines, which spins as it reads the information from the tape. Higher signal density is possible, providing more accuracy in recording and playback.1

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RS-232 Interface A standard interface, typically found in the computer industry, used to exchange information between peripherals.1