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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.
Relay (SPDT) - (Single Pole Double Throw Relay)
an electro-magnetic 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
supllies 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.
Resistance - The opposition to the
flow of AC or DC voltage in an electric
current. Measured in
ohms.
Resistor - An elctrical 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.
RMS - Root Mean Square.
ROM - Read Only Memory. A memory device that one can only read data from.
The data has been pre-programed.
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