11-01-2011, 12:04 PM
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By:- RAJAT RAVI PALIWAL
ABOUT NTPC
NTPC has installed capacity of 29,394 MW.
15 coal based power stations (23,395 MW)
7 gas based power stations (3,955 MW)
4 power stations in Joint Ventures (1,794 MW).
The company has power generating facilities in all major regions of the country.
NTPC, was setup in 1975 world’s largest .
In Forbes list of World’s 2000 Largest Companies for the year 2007, NTPC occupies 411th place.
VISION:-
A world class integrated power major, powering India’s growth, with increasing global presence"
MISSION:-
"Develop and provide reliable power, related products and services at competitive prices, integrating multiple energy sources with innovative and eco – friendly technologies and contribute to society"
ABOUT NTPC NOIDA
SATELLITE COMMUNICATION DEP.
RND DEP.
HR DEP.
QUALITY CHECK DEP.
SATELLITE COMMUNICATION SYSTEM
It is also possible for satellites to communicate with other satellites
Communication can be by microwave or by optical laser
Communication frequencies
Microwave band terminology
L band 800 MHz - 2 GHz
S band 2-3 GHz
C band 3-6 GHz
X band 7-9 GHz
Ku band 10-17 GHz
Ka band 18-22 GHz
Basics: Advantages of Satellites
The advantages of satellite communication over terrestrial communication are:
The coverage area of a satellite greatly exceeds that of a terrestrial system.
Transmission cost of a satellite is independent of the distance from the center of the coverage area.
Satellite to Satellite communication is very precise.
Higher Bandwidths are available for use.
Basics: Disadvantages of Satellites
The disadvantages of satellite communication:
Launching satellites into orbit is costly.
Satellite bandwidth is gradually becoming used up.
There is a larger propagation delay in satellite communication than in terrestrial communication.
Major problems for satellites
Positioning in orbit
Stability
Power
Communications
Harsh environment
