55 lines
1.8 KiB
Markdown
55 lines
1.8 KiB
Markdown
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## Quickstart
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### Different types of orbit
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* LEO
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* Low Earth Orbit (160-2000km) -> A couple of minutes
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* MEO
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* Medium -""-(2000-35785 km) -> GPS
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* GEO
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* Geostationary orbit (above) -> Seems stationary but is actually moving with us
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### Satellite types
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* FM Repeaters
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* uplink on one band and downlink on another, so most optimally you need two antennas
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* SO-50, AO-91, AO-92
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* Linear transponders - Usually SSB and CW
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* Transmit LSB and receive USB
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* OSCAR-7, FO-29, AO-73
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* Digital relay
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* Like BBS
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* FalconSAT-3
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### Doppler shift
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* Upward shift when approaching
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* Downward shift when departing
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### Terminology
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| Abbreviation/Term | Translation |
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| ----------------------------- | ------------------------------------------------------------ |
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| AOS (Acquisition of Signal) | Time that a satellite rises above the horizon |
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| TCA(Time of closest apporach) | Time when the satellite is closest and Doppler shift is zero. Maximum elevation. |
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| LOS(Loss of signal) | When satellite is no longer reachable |
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| Footprint | Ground area - coverage |
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| Uplink | Earth to Space |
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| Downlink | Space to Earth |
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### [AMSAT satellites info](https://www.amsat.org/status/)
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### ISS info
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* [SSTV Cards](https://ariss-sstv.blogspot.com/)
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* [Certificate application](https://www.spaceflightsoftware.com/ARISS_SSTV/submit.php)
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* [Certificate #2](https://ariss.pzk.org.pl/sstv/#award_rules_en)
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* [Repeater information](https://www.ariss.org/current-status-of-iss-stations.html)
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