Satellite Glossary

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• Antenna

A device for transmitting and/or receiving radio waves. Usually a parabolic- shaped dish.

• Analog

Continuous variations in frequency/amplitude. The signals vary continuously instead of in discrete steps (digital). Most current audio/visual machines are analog. Spelt "analogue" in the UK.

• Aperture

A cross sectional area of the antenna which is exposed to the satellite signal.

• Attenuation

Power loss of electromagnetic signals between transmission and reception points.

• Azimuth

The horizontal angle from true north (0 degrees) to a Thaicom satellite in a clockwise direction.