Altair » February 4th, 2017, 5:30 pm wrote:Oops... just doing some more research I've found this vid of the Hispasat launch, a recent one from Jan 27th 2017.
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An Indian teenager has built what is thought could be the world's lightest satellite, which will be put into orbit at a Nasa facility in the US in June.
Rifath Shaarook's 64-gram (0.14 lb) device was selected as the winner in a competition co-sponsored by Nasa.
The 18-year-old says its main purpose was to demonstrate the performance of 3-D printed carbon fibre.
Rifath told local media his invention will go on a four-hour mission for a sub-orbital flight.
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During that time, the lightweight satellite will operate for around 12 minutes in a micro-gravity environment of space.
"We designed it completely from scratch," he said. "It will have a new kind of on-board computer and eight indigenous built-in sensors to measure acceleration, rotation and the magnetosphere of the earth."
The satellite has been named KalamSat after former Indian president Abdul Kalam, a pioneer for the country's aeronautical science ambitions.
His project was selected in a challenge called Cubes in Space, organised by NASA and education company idoodle.
Newcomer scientist Rifath comes from a small town in Tamil Nadu and now works as lead scientist at Chennai-based Space Kidz India, an organisation promoting science and education for Indian children and teenagers.
The KalamSat is not his first invention: at the age of 15, he built a helium weather balloon as a part of nationwide competition for young scientists.
molodyets » May 17th, 2017, 1:50 pm wrote:I've been reading this thread and haven't found an answer to the following question: If radio signals bounce off the ionosphere from land based transmitters, how does the signal from space penetrate the ionosphere? If anyone has the answer to this question, please let me know. Or, if the answer is within this thread, please tell me where because I missed it.
molodyets » May 17th, 2017, 1:50 pm wrote:Another question I've always had is about signal strength. What type of transmission signal would be required for a satellite in Geostationary orbit (~ 35,000km away) to communicate with Earth? Since the signal strength decreases with the inverse square of the distance, a rough calculation shows the signal to be too weak. If we say a satellite can send a signal of 5kw, the signal strength at Earth would be on the order of 1E-12watts. I know different frequencies have different penetrating power so I know it's not as simple. Not even the military has the capability to resolve such a weak signal so they would need a complicated relay pathway with signal booster satellites and such. Hmm, kind of funny, for satellites to be useful, you need more satellites.
Or, the above could just mean that they use modulated laser signals? But then you need to consider beam divergence which is pretty significant at such a long distance.
Peter » May 17th, 2017, 3:38 pm wrote:
Is there honestly not enough info already in this thread, and the rocketry thread, to end the satellite myth for you?
agraposo » May 18th, 2017, 11:15 am wrote:molodyets,
no manmade device or spacecraft has ever gone into space. Period. For people that think the contrary, NASA has a special science to explain all their missions. All they have to do is apply the physic laws that work in the Earth to space. Nobody can demonstrate that they are wrong.
As hoi says, a lot of time can be wasted easily trying to find the answers. But I give you a short reply to your questions.
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