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Results tagged with radio-communication
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user 25
Using radio wavelengths to communicate between multiple spacecraft or between a spacecraft and the Earth.
9
votes
Accepted
Do you need a "wire" on a Europa submarine to phone home?
A wire would be needed to get any real amount of data out. Wikipedia has the state of the art communication with submarines. There are basically 2 ways to communicate with them. Using sound waves coul …
- 122k
5
votes
Are and should satellites use wireless communication internally, rather than cables?
There's another reason that makes this a bad idea. Many satellites are communications satellites of some kind, receiving communication data from a long distance and rebroadcasting it. Those depend on …
- 122k
8
votes
What's stopping space probe communication from being jammed?
So, first of all, what does it take to send the signal in the first place? Each of the Deep Space Network sites has a 34m antenna that is typically used for inner solar system communications. The powe …
- 122k
62
votes
Why would GPS availability be reduced by high demand (or solar eclipse)?
GPS isn't affected by demand, as it is transmitting only from satellites, and the receivers only receive, they do no transmit to the satellite at all. At best, there is a slight degradation by having …
- 122k
2
votes
What kind of signal Voyager 1 is sending to us?
Voyager uses a type of modulation known as biphase modulation. It's rather complex to explain, but basically the phase of the signal can change rapidly. You can see a picture from Wikipedia that shows …
- 122k
12
votes
Hijacked space data, notable instances of recovering images or other goodies from someone el...
Two items of note: Luna 9's initially released pictures came from scientists at Jodrell Bank Observatory in England, which could be received because they were in a standard format. This came ahead of …
- 122k
14
votes
Accepted
Do satellite uplink/downlink signals spread or leak into space?
They have to spread their signal. Also, it requires a really big dish to not spread your signal at all.
Imagine that there was no spreading at all. The dish would have to be pointed exactly at the sa …
- 122k
32
votes
Apollo communication between the Earth and Moon
It can be seen through this Wikipedia article that all communication with the Apollo missions was done at about 2.2 GHz, which is well above the frequency that reflects on the Ionosphere (No higher th …
- 122k