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Results tagged with radio-communication
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user 6944
Using radio wavelengths to communicate between multiple spacecraft or between a spacecraft and the Earth.
45
votes
Has any spacecraft ever had the ability to directly communicate with civilian air traffic co...
Yes. The space shuttle could.
I recall in shuttle ascent abort training, when the crew was executing an East Coast Abort Landing to an airbase / airport on the East Coast, the commander would communic …
- 189k
2
votes
Accepted
Interactions between rocket exhaust and radio communications?
Question: Is there any information at all that describes and quantifies the radio opacity of rocket exhaust? Has this (or related interactions) ever been discussed in detail or even measured in the c …
- 189k
1
vote
Accepted
What was the modulation used in the Space Shuttle Ku-band comm system?
I am not very comm literate but hopefully I can parrot this information about TDRSS Ku-band modulation I found and point you to the source so that you can confirm whether or not it actually answers yo …
- 189k
3
votes
Accepted
Radio antenna used to communicate with the Telstar 1 satellite in 1962
I did not find a explicit comparison with a dish, but this quote does contrast the design with "other possible forms"
The communications
antenna
at Andover
is a much enlarged
version
of similar anten …
- 189k
23
votes
Accepted
What happened to Voyager 2's tracking loop capacitor? How did it get damaged? What is it for...
On April 6, 1978, a fault-protection algorithm onboard Voyager 2 automatically switched from the prime to backup receiver. However, the backup receiver's tracking-loop capacitor3 was found to have fa …
- 189k
14
votes
Encryption in radio system
At least for the Space Shuttle, commands to the orbiter from the ground were routinely encrypted.
Communications Security
Communications security (COMSEC) equipment provides the capability
…
- 189k
3
votes
Is it possible for small satellites to orbit in MEO or GEO?
Addendum: Apollo 15 deployed the Particles and Fields Satellite into lunar orbit. It returned data from August 1971 to January 1973.
It weighed 36.3 kilograms.
Source
- 189k
6
votes
Accepted
First Ham Radio contact from space; what frequency, what kind of antenna, and how did they r...
This happened on the first Spacelab flight, STS-9.
For the 1983 ham radio contact mentioned above, what wavelength...
All ham radio operation for STS-9 will be in the
Amateur Radio 2-meter band (144- …
- 189k
20
votes
Accepted
What kind of signals and encodings were used to send tilt/pan commands to TV cameras on the ...
For the Ground-Commanded Television Assembly (GCTA) mounted on the rover that was used to image Apollo liftoffs from the moon:
The real-time command messages consist of three vehicle address bits
(us …
- 189k