Modes to operate a radio

The frequencies also depend on the type of communications: voice, morse code, packet, APRS, RTTY, ATV, SSTV, EME Lunar Reflection, Satellite Television and many others are used, depending on each one’s preferences.

Because it’s almost impossible defining each of these in detail in this project, I’ll just make a brief comment about each one:

Voice: The most used type because it’s the simplest to use. It uses only the voice and the radio.

Morse Code: Still used by many stations that like this mode, it’s based on sending audible tones using the signs described above ( - , .) to make words becoming a message.

Packet: Digital way of communication, it uses a computer, a modem and a radio. Through these, bits are sent and received to form a message, just like our well-known Internet, but of course wireless.

APRS: “Automatic Positioning Report System”. Once again a computer allied to a radio and a GPS (Global Positioning System), are capable of projecting in a map all the amateur radios that use the same system.

RTTY: “Radio Tele-Type”. This mode uses again a computer to send and receive characters just like morse but informatized.

EME: “Echo Moon Emission”. Just as the name indicates, the moon is used as a mirror and the signal can reach the other side of the world.

Satellite Amateur Television: Through a satellite, a parabolic antenna and a receiver we don’t only listen each other but also see everything that is happening on the other side