Radio is a foundation technology. What we call mobile phones are in fact radios that send and receive (duplex) radio signals via relay transmitters in areas broken up into cells.
What makes amateur radio efficient in times of emergency, that the radio signals, especially in 10 and 20 metre bands are not dependent on repeaters like mobile phones, but the signal is bounced along between the curvature of the earth and the ionosphere, a layer of ionised gases in the earth’s upper hemisphere enabling the signal to travel great distances around the earth.
A radio like what is shown in the article, as long as it is powered by a DC power source or plugged into a car cigarette lighter can operate independent of any mainland electrical grid.
Thus communication can be maintained
Amateur radio maybe a dinosaur compared to the modern telecommunications in vogue today, but it is based on the elementary electrical principles that fm, am, shortwave and microwave communications are based
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