Space station — An amateur station located more than 50 km above the Earth’s surface.

Splatter — See Out-of-band emission.

Spread Spectrum — A technology, originated during World War II, which distributes or spreads a radio signal over a broad frequency range. This spreading prevents narrow band signals and noise sources from interfering with the spread spectrum signal. The spread spectrum signal is heard as noise to the traditional narrow band receiver. Also, emissions using bandwidth-expansion modulation emissions having designators with A, C, D, F, G, H, J or R as the first symbol; X as the second symbol; X as the third symbol.

Spurious emission — An emission, on frequencies outside the necessary bandwidth of a transmission, the level of which may be reduced without affecting the information being transmitted. They include harmonic emissions, intermodulation products and frequency conversion products, but exclude out-of-band emissions.

SSB (Single sideband) — A common mode of voice operation on the amateur bands.

SSTV (Slow-scan television) — A mode of operation in which ham radio operators exchange still pictures from their stations.

SWL (Shortwave listener) — A person who enjoys listening to shortwave radio broadcasts or Amateur Radio conversations.

Telecommand — A one-way transmission to initiate, modify, or terminate functions of a device at a distance.

Telecommand station — An amateur station that transmits communication to initiate, modify, or terminate functions of a space station.

Telemetry — A one-way transmission of measurements at a distance from the measuring instrument.

Test — Emissions containing no information having the designators with N as the third symbol. Test does not include pulse emissions with no information or modulation unless pulse emissions are also authorized in the frequency band.

TIS (Technical Information Service)— A service of the ARRL that helps hams solve technical problems.

Transceiver — A radio transmitter and receiver combined in one unit.

Transmitter — A device that produces radio-frequency signals.

UHF (Ultra-high frequencies) — The radio frequencies from 300 to 3000 MHz.

VE (Volunteer Examiners) — Amateur Radio operators who give Amateur Radio licensing examinations.

VHF (Very-high frequencies) — The radio frequencies from 30 to 300 MHz.

WAS (Worked All States) — An ARRL award that is earned when an Amateur Radio operator talks to and exchanges QSL cards with a ham in each of the 50 states in the US.

WAVE (Worked All VE) — An award that is earned when a ham talks to and exchanges QSL cards with a ham in each Canadian province.

Wavelength — A means of designating a frequency band, such as the 80-meter band.

Work — To contact another ham.

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