parabolična antena

parabolična antena

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 focus the weak microwave signal hitting the surface of the dish into a single focal point in front of the dish. It is at this point that the feedhorn is usually located.

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เพิ่มภาพ

ส่วนหนึ่งของคำพูด: noun
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Blossary:
อุตสาหกรรม/ขอบเขต: Aerospace
Category: Satellites
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antena

Astronomy; Planetary science

A conductor by which electromagnetic waves are transmitted or received.

antena

Aerospace; Satellites

A device for transmitting and receiving radio waves. Depending on their use and operating frequency, antennas can take the form of a single piece of wire, a di-pole a grid such as ...

orbitalni period

Aerospace; Satellites

The time that it takes a satellite to complete one circumnavigation of its orbit.

šum

Aerospace; Satellites

Any unwanted and unmodulated energy that is always present to some extent within any signal.

modulator

Aerospace; Satellites

A device which modulates a carrier. Modulators are found as components in broadcasting transmitters and in satellite transponders. Modulators are also used by CATV companies to ...

herc (Hz)

Aerospace; Satellites

The name given to the basic measure of radio frequency characteristics. An electromagnetic wave completes a full oscillation from its positive to its negative pole and back again ...

interferencija

Aerospace; Satellites

Energy which tends to interfere with the reception of the desired signals, such as fading from airline flights, RF interference from adjacent channels, or ghosting from reflecting ...