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Hobbyist Feeds RTL-SDR ADS-B Reception Into Terminal Globe Instead of OpenSky Data

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A developer wanted to receive aircraft radio signals directly rather than relying on OpenSky Network's public feed for their terminal-based globe, ttymap. They bought a low-cost RTL-SDR dongle and dipole antenna, which needs no radio license for receive-only use. The dongle's chip was originally sold as a TV tuner, so the kernel's TV driver had to be blacklisted before it could be used as a software-defined radio. Running rtl_adsb picked up raw Mode-S frames from several aircraft, but converting them to coordinates requires CPR decoding, which the author handles with the pyModeS library using their home position as a reference.

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