Satellite Characteristics

Satellite Characteristics
How satellite systems work conventionally:
Namely by sending signals from computers and relayed by satellites without processing in satellites. Weaknesses of this method, computers that are connected directly to the satellite must work for 24 hours. If one computer is turned off then the connection to the computer will be disconnected. The advantage is that conventional communication satellites can be used without modification. Computers in satellites function to temporarily store information that can automatically be done.

How data transmission works via satellite:
The use of satellite communication systems has provided the ability for humans to communicate and obtain information from various parts of the world simultaneously without regard to their relative distance. The basic components of satellite transmission are:

Earth station, used to send and receive data
Satellite, also called transponder
PCs that use internet networks with satellite networks are categorized as wireless networks using microwaves. These microwaves will be transmitted and processed by earth satellite stations which are then transmitted to satellites in outer space, and subsequently will be received again by the destination earth satay station.
How it works to transmit data via satellite by paying attention to these components, namely the satellite receives a signal from the earth station (up-link) then strengthens the signal, changes the frequency and retransmits the data to another receiving earth station (down-link). In satellite transmission there is a delay because the signal must move towards space and back to earth, a time lag of about 0.5 seconds. Satellites use different frequencies to receive and transmit data. Satellite frequency range is:
4-6 giga hertz, called C-band
12-14 giga hertz, called Ku-Band
20 giga hertz.

Various Kinds of Satellites
1. Natural Satellite
Natural satellite is one of the extraterrestrials that already exists (not made by humans) orbiting a planet. Earth's natural satellite, the moon. During the moon around the planet Earth, the moon undergoes three movements at once, namely rotation, revolution, the moon around the earth and the revolution of the moon around the sun.

Natural Satellite Function
Indirectly natural satellites to protect a planet orbitered from a hit by other celestial bodies such as comets and asteroids
To control a rotational speed on a planet because of its effect gravitational tidal wave
in order to balance a sea water cycle which results in tides in sea water
In order to reduce an effect caused by an ultraviolet radiation
As lighting at night
Examples of natural satellites

The moon, which is a natural satellite owned by planet Earth
Callisto
Ganymede
Io satellite, which surrounds the planet Jupiter
Titan satellites that orbit the planet Saturn

2. Artificial Satellite
An artificial satellite is one of man-made space objects orbiting a planet that in its manufacture has certain types and functions with a purpose for the benefit of humans. Here are the types of satellites based on their functions:
Navigation satellites, which is one type of man-made satellite that has functions for the world of aviation and shipping. This navigation satellite can provide an information about the position of aircraft and ships that are in transit.