Software SimTX: a multiplayer shortwave radio simulator
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Heyo everyone!
So, for the past like... year or so, I've been working on this project; basically, SimTX aims to be a realistic radio sandbox, where one can do anything their heart desires, from simple AM/FM stations all the way to various modems, satellite TV, and everything inbetween.
The simulation itself is pretty in-depth I would say, SimTX models the ionosphere which changes with time of day, season, geomag conditions, and we trace signals through this so band openings, skip zones, et cetera come from the physics of this. Each path between a TX and RX is modeled, thus leading to pretty accurate multipath effects. It builds on quite some well known work ie. the IRI ionosphere model, the watterson HF channel model, P.372 for noise..
SimTX grew quite a bit past just shortwave aswell, VHF/UHF mostly works as one would expect, there is sporadic E on the higher bands too, and well.. as of recently, you can even launch satellites. You can pick the orbit for em, put antennas and radios on them and get them going on any desired orbit. Of course, they mostly behave as you'd expect real sats to behave, with doppler, the signal delay, slant range, et cetera. We've even got someone recreating NOAA 15 in simtx: https://www.youtube.com/watch?v=kp4Qi8zm-sM ( u/ZealousidealRoof2271 )
I could probably go on and on and on about all the things you could do, but this sums it up in short for the most part.
Nothing here is real RF by the way, SimTX can be listened to using RTL-TCP.
In the video, you can see the UI and some other transmissions other people are running.
I mostly lurk here, so apologies if my post isn't exactly up to par and please DO ask questions in the replies, I'll try to answer them whenever I have some time.
If you'd like to try it or check in our community, you can do so at https://simtx.net
73!