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Power, dB, dBm, dBi and dBd — what they mean

Decibels as ratios, dBm/dBW as absolute levels, dBi/dBd as antenna gain, plus ERP and EIRP — with practical examples for radio amateurs.

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Sources

  1. ITU-R V.574-5 — dB, dBm, dBW, dBi, dBd (verified excerpt)

    ITU-R

  2. ITU Radio Regulations 1.160–1.162 — gain, e.i.r.p., e.r.p.

    ITU

  3. ITU-R P.341-7 Table 1 — half-wave dipole 2.15 dBi

    ITU-R