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Results tagged with radio-communication
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user 23354
Using radio wavelengths to communicate between multiple spacecraft or between a spacecraft and the Earth.
6
votes
Accepted
What "gap" could have caused the Starliner instructions to be delayed?
This was briefly discussed in the Dec 21 press briefing.
It wasn’t a gap in the sense of “no radio waves here”. Rather, since the craft was confused about what time it was and hence what attitude i …
- 12.9k
2
votes
Accepted
What is the highest non-optical frequency used or tested for use in deep space communication?
In the case of Earth-space and space-Earth (i.e. not space-space) communications, there's a V band window of interest above the current bands:
(that presentation might be interesting to reading it's …
- 12.9k
1
vote
Accepted
Will there be "Near Space" Ka-band allocations for TESS?
The ITU does the allocations in this area. There's been some recent activity to increase allocations for "space research communication" in these bands, but that's not worked it's way through the chai …
- 12.9k
7
votes
Accepted
What was the transmitting power of the Apollo astronauts' PLSS VHF radio transmitters?
This is a bit of a breadcrumb trail, but page 2-99 of NASA MSC-01372-1 "Apollo Operations Handbook Extra Vehicular Mobility Unit" (March 1971) discusses the power used for Apollo 15-17:
The dual m …
- 12.9k
4
votes
Accepted
How does SpaceX transmit the video feed from the first and second stage cameras back to Earth?
You can get some information from SpaceX's FCC filings for "Special Temporary Authority". There aren't always individual ones for specific launches, because certain approvals cover larger times, and t …
- 12.9k
27
votes
Accepted
What is carrier lock and bit lock?
First you lock on to energy at (or near) the expected frequency. That’s carrier lock.
Then you start to look for patterns in how the phase changes. The transmitter is coding groups of bits as phase- …
- 12.9k