Elenco FM Wireless Microphone Kit - Manual (Page 11)

SCHEMATIC DIAGRAM
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GLOSSARY
Amplitude Modulation To modify the amplitude of the carrier
wave in accordance with the desired
signal, often abbreviated as AM.
Amplify To enlarge; increase in scope or
volume.
Antenna A device by which radio waves are
released or received.
Audio Sounds that are capable of being
heard by the human ear.
Buffer Stage A circuit used to insulate signals
from other circuits.
Capacitor A device that is capable of holding
an electric charge.
Capture The capacity of an FM receiver to
pick only the strongest signal and
thus reduce co-channel
interference.
Carrier Wave The unmodulated wave radiated by
a broadcast station.
Deviation The change in frequency away from
the carrier wave due to FM
modulation.
Efficiency The ratio of energy expended to
power produced.
Frequency Modulation To modify the frequency of the carrier
wave in accordance with the desired
signal, often abbreviated as FM.
FM Broadcast Band The range of frequency where
commercial frequency modulation
is allowed by the Federal
Communications Commission
(FCC).
FM Transmitter The sending apparatus of a radio
wave in which the message is
contained in the frequency of the
carrier wave.
Hertz A term used to indicate the number
of cycles per second.
High Fidelity A term used to indicate total
coverage of the hearing system.
Inductor A device capable of storing
electrical energy in the form of a
magnetic field.
MHz or Megahertz A million cycles per second.
Microphone A device used for producing an
electrical current corresponding in
its variations in air pressure of
sound.
Modulate To modify a characteristic of a
carrier wave in accordance with the
characteristics of a desired signal.
Noise In electronics, noise is usually the
random electrical signal produced
by the thermal agitation of atoms or
static discharges.
Oscillator A device that continually swings
back and forth between two fixed
points.
Peak Detector A device used to recover the
modulated signal from an amplitude
modulated wave.
Pendulum A body suspended from a fixed
point so that it may swing freely.
Resistor An electric device used to restrict
the flow of electrical current.
RF Carrier The radio frequency wave used to
“carry” the desired signal.
Saturate Completely charged or at its limit of
operation.
Standing Wave Ratio A term used in electronics to
describe the amount of power
reflected back as a ratio of the
amount of power radiated.
Tuned Circuit A collection of components used to
select a single or small group of
frequencies.