[[File:CB radio modem2.jpg|600px]]
[[File:CB radio modem3.jpg|600px]]
== Packet Radio ==
Packet Radio is a digital radio protocol that evolved from previous digital radio protocols like Morse code or Teleprinter. Packet Radio is frequently used by amateur radio operators.
See: [https://youtu.be/ZC-RXBuUatA Demonstration of Packet Radio transmission with an Amstrad CPC]
== FM radio diffusion ==