Glossary - Harris RF-7800W Student Manual

• ANTENNA POWER GAIN — The ratio of radiated power in a given direction to the antenna input power.
• BANDWIDTH — The range of frequencies occupied by a given signal.
• BLOS (Beyond Line-of-Sight) — Communications that occur over a great distance.
• DIRECT WAVES — Travel in straight line, becoming weaker as distance increases.
• DIRECTIONAL ANTENNA — An antenna that receives or sends signals most effectively in a particular direction.
• FREQUENCY — The number of completed cycles per second of a signal, measured in Hertz (Hz).
• FREQUENCY HOPPING — The rapid switching (hopping) of radio system frequency for both the receiver and transceiver
from frequency to frequency in apparently random patterns, using a common timing reference.
• GAIN — The ratio of the value of an output parameter, such as power, to its input level.
Usually expressed in decibels.
• GROUND REFLECTED WAVE — The portion of the propagated wave that is reflected from the surface of the earth between
the transmitter and receiver.
• GROUND WAVE — A radio wave that is propagated over the earth and ordinarily is affected by the presence of the ground.
• Hz (Hertz) — Basic unit for frequency.
• IMPEDANCE — Opposition to current flow of a complex combination of resistance and reactance.
• IONOSPHERE — A region of electrically charged particles or gases in the earth's atmosphere extending from 50 to 600
kilometers (approximately 30 to 375 miles) above the earth's surface.
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