You do not understand satellite technology. During a launch, there should only be one or two satellites on board. Modern satellites weigh 5,000kg or 10,000 pounds and operate for 15 years. Launching four satellites or more during a single launch means that Indian satellite technology is far below the world standard.
I will illustrate my point by contrasting a Chinese launch with a modern satellite and the launch of inferior multiple Indian satellites.
China launches 5,000kg modern DFH-4 satellites.
India launches high-school projects with 83kg to 630kg satellites (see third citation below). All ten Indian satellites combined weighed a mere 824kg. This is a far cry from a modern 5,000kg Chinese satellite.
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China's DFH-4 matches Western standards for modern communication satellites
The characteristics of a modern communications satellite are:
1. It is the size of a city bus and weighs about 10,000 pounds.
2. It lasts for 15 years.
3. It has approximately 32 transponders.
China's DFH-4 satellite bus (or platform) designed and built by CGWIC (i.e. China Great Wall Industrial Corporation)
DFH-4 satellite technical specifications
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A typical satellite has 32 transponders. Transponders each work on a specific radio frequency wavelength, or band.
Satellite communications work on three primary bands: C, Ku and Ka. C was the first band used and, as a longer wavelength, requires a larger antenna. Ku is the band used by most current VSAT systems. Ka is a new band allocation that isnt yet in wide use. Of the three, it has the smallest wavelength and can use the smallest antenna." (Source:
Beyond line of sight communications)
Western satellite specifications look identical to China's DFH-4 satellite. (Source:
User:Bhamer/sandbox - Wikipedia, the free encyclopedia)
China's DFH-4 is comparable to Western satellites. Its 30 transponders (or perhaps the Pakistanis weren't willing to buy more than 30 transponders) are very close to the average of 32 transponders on a modern satellite. At 5,200 kg or 11,440 pounds, it is approximately the same weight as Western satellites in the 10,000-pound class. The DFH-4 uses the "three primary bands: C, Ku, Ka," and L bands. Its solar panels generate the standard 8 kW of power.
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http://www.spacenews.com/archive/archive06...nadfh_1016.html
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China Looks To Boost Satellite Manufacturing With DFH-4 Line
By PETER B. de SELDING
Space News Staff Writer
posted: 18 October
2006
03:30 pm ET
...
PARIS -- The first of a new line of high-power telecommunications satellites produced in China and already sold to two export customers is scheduled for launch in late October for China's Sinosat direct-broadcast television provider, Chinese space officials said.
The Sinosat-2 satellite, the first of the DFH-4 spacecraft built by the China Academy of Space Technology (CAST), has faced several delays but is now expected to be launched in the coming weeks by a Chinese Long March 3B rocket from China's Xichang Satellite Launch Center in southwest China's Sichuan Province.
If it functions as planned, the DFH-4 satellite design will bring China's domestic satellite manufacturing industry closer to the level of its U.S., European and Japanese counterparts.
DFH-4 is the third generation of China-built telecommunications spacecraft and carries some 800 kilograms of payload -- four times the capacity of the previous Chinese product, the DFH-3. Weighing up to 5,300 kilograms at launch, the DFH-4 platform is built to operate for 15 years -- double the DFH-3's life expectancy -- and provide up to 10 kilowatts of power at the end of its service life.
...
Wang said CAST has tested the DFH-4 design to a maximum capacity of 54 transponders, 38 in Ku-band and 16 in C-band. The satellite's upper limit would be around 5,600 kilograms, he said in the presentation. (article continues)"
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India sets world record, launches 10 satellites at one go - Times Of India
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India sets world record, launches 10 satellites at one go
PTI Apr 28, 2008, 11.04am IST
PSLV-C9 blasts off from the Satish Dhawan Space Centre at Sriharikota (AP Photo)SRIHARIKOTA: Setting a world record, India's Polar rocket on Monday successfully placed ten satellites, including the country's remote sensing satellite, into orbit in a single mission. ( Watch )
The ten pack launch of the Indian Space Research Organisation (ISRO) saw the 230-tonne Polar Satellite launch Vehicle (PSLV-C9) carry the heaviest luggage--824 kgs--and put into orbit an Indian Mini Satellite and eight foreign nano satellites besides the Cartosat-2A remote sensing satellite.
At the end of the 52-hour countdown, the PSLV-C9, with a lift-off mass of 230 tonne, blasted off from the launch pad at the Satish Dhawan Space Centre and soared into the clear sky in a textbook launch. (Watch)
Fourteen minutes after lift off, the fourth stage of the ISRO's workhorse launch vehicle, in its 13th flight, injected the ten satellites, into the 635 km polar Sun Synchronous Orbit (SSO).
This is for the first time that ISRO has put ten satellites in orbit in a single launch. This is also PSLV's twelfth successful flight.
It is for the first time in the world that ten satellites were launched in a single mission. Russia had earlier launched eight satellites together.
Besides the 690 kg Indian remote sensing satellite CARTOSAT-2A and the 83 kg Indian Mini Satellite (IMS-1), the rest eight Nano Satellites were from abroad.
This is the third time, the PSLV has been launched in the core alone version, without the six solid propellant first stage strap-on motors.
Terming the launch "satisfactory", ISRO Chairman G Madhavan Nair said "all parameters worked wonderfully well."
Congratulate ISRO
for successfully placing ten satellites into orbit in a single mission."
