> not trivial or cheap From your previous comment, it sounds like your experience may have been from a while ago? In 2022, it is fairly trivial and cheap: http

> not trivial or cheap From your previous comment, it sounds like your experience may have been from a while ago? In 2022, it is fairly trivial and cheap: https://github.com/osqzss/gps-sdr-sim https://github.com/osqzss/gps-sdr-sim I can not ;^) personally confirm that this works with a HackRF, which is like $300, but probably also with any other reasonable tx-capable sdr.