децибел (dB)

децибел (dB)

The standard unit used to express the ratio of two power levels. It is used in communications to express either a gain or loss in power between the input and output devices.

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Ngành nghề/Lĩnh vực: Aerospace
Category: Satellites
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децибел( dB)

Energy; Wind energy

is a unit of measurement that is used to indicate the relative amplitude of a sound or the ratio of the signal level such as sound pressure. Sound levels in decibels are ...

децибел

Physics; Acoustics

A logarithmic scale applied to any parameter, including for measuring sound level.

децибел

Physics; General physics

Unit of sound level, if P1 & P2 are two amounts of power, the first is said to be n decibels greater, where n = 10 log10 (P1/P2)

децибел

Natural environment; Coral reefs

Unit for measuring sound intensity.

гигахерц (GHz)

Aerospace; Satellites

One billion cycles per second. Signals operating above 3 Gigahertz are known as microwaves. above 30 GHz they are know as millimeter waves. As one moves above the millimeter waves ...

фреквенција

Aerospace; Satellites

The number of times that an alternating current goes through its complete cycle in one second of time. One cycle per second is also referred to as one hertz; 1000 cycles per ...

сателит

Aerospace; Satellites

A sophisticated electronic communications relay station orbiting 22,237 miles above the equator moving in a fixed orbit at the same speed and direction of the earth (about 7,000 ...

параболична антенаме

Aerospace; Satellites

The most frequently found satellite TV antenna, it takes its name from the shape of the dish described mathematically as a parabola. The function of the parabolic shape is to ...

мегахерц (MHz)

Aerospace; Satellites

Refers to a frequency equal to one million Hertz, or cycles per second.

килохерц (kHz)

Aerospace; Satellites

Refers to a unit of frequency equal to 1,000 Hertz.

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Ngành nghề/Lĩnh vực: Animals Category: Birds

црвени северни фликер

The Red-shafted Northern Flicker (Colaptes auratus) is a medium-sized member of the woodpecker family. Native to western North America, it's one of ...