Generally use Cable as a media of data transmission. In this post we describe about different types of cable which use in satellite and other communication network.
Co-axial cable: It is a type of cable where available two rounded conductor, an insulator and a jacket. In short, Co-axial s called Coax.
Co-axial cable is two kinds: (i) Thin net and (ii) Thick net
Thick net Co-axial cable is Light and soft. Its Installation process is easy but expensive. Thick net cable is more Fat then Thin net cable. Its breadth is 0.5 inch or 13 mm. It is a hard cable and It can transfer data within 500 Meters. It is also known as Ethernet cable.
Advantages: (i) Its Data transfer rate is more than a parallel wire (ii) Its transmission loss is low then a parallel wire and (iii) It can transfer digital data within one more kilometers
Characters: (i) Its total cost is more than a parallel wire (ii) The Installation process of co-axial cable is easy because it is a hard cable and it may not lost (iii) Its Data transmission speed is up to 20 Mbps and (iv) It has no Electromagnetic interface.
Twisted pair cable: For Low cost, now days its uses is growing up. The cable use in Telephone as a example of twisted pair cable. Twisted pair cable is creating by twisted copper. In every twisted pair cable available conductor, Jacket and insulator. Twisted pair cable is two kinds:
Unshielded twisted pair: In Maximum times it has no shield though it works as a STP. It has many colors coding for its introduction.
Characters: (i) Its Price is too low from other cable (ii) Its installation process is easy (iii) Low price of installation requirements (iv) Data transmission speed is 100 Mbps Maximum (v) Transmission Distance More hundred (vi) Here available EMI Problem.
Shielded twisted pair: This type cable made by Foil wrap or woven. This cable is mainly use in Token ring system.
Characters: (i) Its price is more than a co-axial cable or Unshielded cable (ii) Its installation process mainly complex (iii) Its data transmission speed is 500 Mbps (iv) It can transmit data within 100 meters (v) Here no transmission loss.
Generally a satellite completes the following works: Cartography Monitoring agricultural and forestry, Oceanography, Oceanography, Ice Recognizance, Monitoring oil pollution and air pollution, Snow melt, Mineral and oil exploration.
Measurement of performance characteristics of earth station: (i) By This can tale cast in satellite (ii) It can collect information (iii) It has four subsystem (iv) The Transmission system of Earth stations is high constable (v) On Earth station transmitter here use High speed Amplifier (vi) Earth stations Receiver has low Noise Amplifier and (vii) It is fully transfer data by an Antenna.
Sun Interference:
The orbit satellite transfer data or signal by Light and Dark both sections but Equinox Period satellite only can transfer signal or data by darkness point. In Mid-day, when the sun credit full hits, then the microwave source temperature stays within 6000 to 10,000K. In this system, Satellite communication use 4 to 5 GHz Frequency.
Satellite Earth stations block Diagram:
In the 1st steps here available Input r Base band Signal.Then Send the signal to Encoder, After encoding encoder transfer the signal directly to Modulator, Modulator Receive the signal from amplifier and Modulate it, After complete modulation, Transfer it to Up Converter, Then High power Amplifier, Then Polarized Diplexer Antenna
Then Low Power Antenna, Then down converter works for transfer signal to down from satellite, Then Demodulator. Demodulator collected it and demodulate it carefully, Then send to Decoder for dedicate main signal And Finally complete transmission by output of base band signal.
