SWLz Dictionary

radio: The transmission of signals by modulation of electromagnetic waves with frequencies below those of visible light.

Radio Regulations: An intergovernmental treaty text of the International Telecommunication Union, the Geneva-based specialized agency of the United Nations that coordinates and standardizes the telecommunication networks and services. It also helps advance the development of communications technology.

shack: Named after the small enclosures added to the upperworks of ships to hold the first radio equipment and their batteries, a "shack" is a slang term for the location of radio equipment.

shortwave radio: Radio that operates between the frequencies of 3 MHz (3,000 kHz) and 30 MHz (30,000 kHz).

Single-Sideband Modulation (SSB): A refinement of amplitude modulation that more efficiently uses electrical power and bandwith.