Nick Szabo: if you want to help and you are smart... Me: uh - smart standing next to who? Found a free book online from 1965 on ionospheric radio propagation 498 pages - which is fine, but I wonder if there have been advances in the study that might make this obsolete (checking)https://twitter.com/NickSzabo4/status/1102314969792565248 …
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You can buy packet radio modems and software that packetizes and broadcasts over radio bouncing off the ionosphere. I've seen packet radio BBS in the early 90s using these setups. https://kantronics.com/ .
Good stuff. These days though I strongly recommend SDR, it's a huge advance in the state of the radio art, and all the stuff I've seen being developed in this space is based on it.
