мегахерц (MHz)

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

航空宇宙; 衛星

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 ...

децибел (dB)

航空宇宙; 衛星

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.

сателит

航空宇宙; 衛星

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

航空宇宙; 衛星

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 ...

килохерц (kHz)

航空宇宙; 衛星

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

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産業/ドメイン歴史カテゴリ世界史

Новгород

Водећи град Русије и комерцијални центар који је био у процвату током средњег века, постао је главни уред Ханза. На врхунцу своје моћи под Александром ...