I see that 5cm is available for satcom in amateur radio. Are there any active satellites for that?
If so, what satellites and are their TLE's available?
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SatNOGS is a pretty cool crowdsourced satellite observation / recording system, and they have a database of known satellites. By the way, if you're using GPredict, the
transmitters.json that describes all transponders is just a SatNOGS database dump.
Since remote stations (and what could be more remote than a satellite in space?) need to be registered, the "official" way would be going through all relevant national registries (FCC, OFCom, BNetzA, …) and looking for amateur radio satellite registratiobs, but a) seems like work, b) "registered", especially in the era of self-built micro-satellites is not overly indicative for "operational".
typically, yes. NORAD will have data, and for that satellite,you can display its position through the TLEs downloaded from www.celestrak.com in Gpredict. Nifty! (for some reason, Gpredict doesn't show the ground path, I don't know why exactly)
The orbit, rendering curtesy of celestrak, is polar: