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Updated readme and added notes

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README.md
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## satExplore
Repository in which me(LZ1BUK) and LZ1TIN document our amateur radio astronomy projects. Expect pictures, reports, recordings, etc. Only folder you should ignore in this repo is the `assets/` folder
For future plans [check out plans.md](notes/plans.md)
### Hardware we use
We have the HTs needed for VHF/UHF communication, but specifically for satellites we use:
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* SDR++ - an SDR interface
* NOAA APT - a NOAA image decoder
* wxtoimg - a satellite image decoder
* gpredict - Satellite position predictor for linux
* Heavens Above - Satellite position predictor for android

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## Interesting satellites
[Data gathered from here](https://amsat.org)
### FM Repeaters
* [ ] ISS
* [ ] SO-50
* SO-50 carries several experiments, including a mode J FM amateur repeater experiment operating on 145.850 MHz uplink and 436.795 MHz downlink. The repeater is available to amateurs worldwide as power permits, using a 67.0 Hertz PL tone on the uplink, for on-demand activation. SO-50 also has a 10 minute timer that must be armed before use. Transmit a 2 second carrier with a PL tone of 74.4 to arm the timer.
* [ ] AO-91/92
* [ ] EO-80
* FM Voice Repeater
* 435.080 MHz 210.7 HZ PL Tone Uplink
* 145.840 MHz Downlink (also 9k6 FSK data)
* 145.880 MHz 1k2 BPSK or CW Telemetry
### Telemetry
* [ ] Stars-1
* [Info here](https://www.amsat.org/beaconclosed-satellites/stars-1-space-tethered-autonomous-robotic-satellite/)
* Downlink (Mother):
* 437.305 (CW)
* 437.485 (FM AX25)
* Uplink (Mother):
* 144 MHZ (AX25 command only)
* Downlink (Daughter):
* 437.275 (CW)
* 437.465 (FM AX25)
* Uplink
* 144 MHZ (AX25 command only)
* [ ] ShindaiSat
* [Info here](https://www.amsat.org/beaconclosed-satellites/shindaisat-ginrei/)
* Downlink:
* 437.485 (X.251k2 AFSK)
* Downlink:
* 437.305 (CW Beacon)
* [ ] 50SAT
* [Info](https://www.amsat.org/50sat-mo-76/)
* 437.505 MHz
* Modes
* FM slow Morse callsign beacon
* FM fast Morse telemetry
* FSK RTTY telemetry
* 1kbps data
### Weather satellites
* [x] NOAA 19
* [ ] NOAA 15
* [ ] NOAA 18
* [ ] METEOR M2
* [ ] ADEOS II

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