Wireless radio and signals

Wireless radio and signals: the invisible infrastructure

Radio is not a relic of the past nor a marginal hobby.
It is one of the most critical and least visible infrastructures of the modern world.
Emergency communications, navigation, sensors, radars and civil networks
depend on wireless signals functioning continuously.

In this TechLab section articles related to
Radio, amateur radio, CB, SDR, radio spectrum
and signal-based technologies are grouped.
It is not a chronological list, but a thematic entry point
to understand how the physical layer of the connected world works.