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Results tagged with radio-communication
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user 15906
Using radio wavelengths to communicate between multiple spacecraft or between a spacecraft and the Earth.
1
vote
How much power do missions to other planets use for radio transmissions?
The transmitters used in the spaceships were small to save weight and power. The HF output power was small, about 20 W.
For downlink to earth this was compensated by using very large antenna dishes an …
- 49.5k
4
votes
Accepted
How does the signal strength from the Voyager probe change with distance?
The signal strength decreases proportional to the inverse square of the distance.
For double distance the strength is only 25 %. For 10 % more distance 17.36 % less signal.
- 49.5k
1
vote
How many stations could one hear with an AM/FM radio in front of the ISS' cupola window?
The power of FM transmitters and the sensitivity of FM recivers are optimized for a range of some 10 km for local transmitters and up to 200 km for transmitters on a mountain. But if a wave goes horiz …
- 49.5k
6
votes
Which satellites can hear emergency signals from Scott Kelley's watch?
The answer is given within the question, the emergency signals are received by the the International Cospas-Sarsat Programme satellites.
From wikipedia:
Space segment
The Cospas-Sarsat syste …
- 49.5k
0
votes
How would the Voyagers finally die if allowed to transmit to the bitter end?
We could not know for sure. There may be a failure of the transmitter, of the computer or of the attitude control. Or a malfunction caused by decreasing temperature when heaters must be switched off. …
- 49.5k
4
votes
Why are minimum three artificial satellites required for radio-communication all around the ...
That is a very simple geometric problem. Imagine a globe on your desk and two table tennis balls. You hold one ball at one side of the globe and the other ball on exactly the opposite side of the glob …
- 49.5k
1
vote
How will the closure of the Arecibo dish impact deep space communications?
It is too late now to think about a repair. The instrument platform crashed into the dish at the first day of December.
- 49.5k
4
votes
When scientific and engineering data are sent from space probes, are the signals repeated to...
Just a single repetition would not help. If there is a single error within those two data blocks, you do not know where the error is and have no chance to correct the error.
If the data is transmitte …
- 49.5k