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The band of frequencies which is modulated onto or from the carrier in a wideband radio relay system and which is occupied by television, multichannel telephony, telegraphy, or similar signals and any pilot or other associated signals.

Reference: Icharge currentIntensity.EIlluminanceEnergy.CContrastCelsius (previously Centigrade)Capacitance.

Please note that this is the term as it stands in the original IALAInternational Association of Marine Aids to Navigation and Lighthouse Authorities - AISM Dictionary edition (1970-1989)