Occupied bandwidth

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The frequency bandwidth such that, below its lower and above its upper frequency limits, the mean powers radiated are each equal to 0.5% of the total mean power radiated by a given emission. In some cases, for example multi-channel frequency-division systems, the percentage of 0.5% may lead to certain difficulties in the practical application of the definitions of occupied and necessary bandwidth; in such cases a different percentage may prove useful.

Reference: I.T.U.

Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)


charge current


Time period

roll period


International Association of Marine Aids to Navigation and Lighthouse Authorities - AISM