How does Packet Radio work?

Packet radio is a digital mode in amateur radio that allows data packets to be sent and received in a similar way to the Internet. The data is divided into small packets and sent with address and error correction information. Each packet is forwarded to its destination through a series of amateur radio stations that act as nodes. This technology makes it possible to transmit text messages, position data and simple telemetry data over long distances, even when there is no direct radio contact between end users. Transmission usually takes place on frequencies in the VHF/UHF range, less often on shortwave. The AX.25 protocol is used. Packet radio was a popular method of forming amateur radio networks, especially before the Internet was widely available.