Effective Isotropic Radiated Power is the apparent power transmitted towards the receiver, if it is assumed that the signal is radiated equally in all directions, such as a spherical wave emanating from a point source; in other words, the arithmetic product of the power supplied to an antenna and its gain.

G: Antenna gain coefficient

g: Antenna gain [dBi]

P: Power [W]

Following table contains values for the C band. The values shown in the table assume having an LNB with noise figure of 20°K:

EIRP Field Intensity Antenna diameter 42.0 dBW 110 cm 41.5 dBW 120 cm 41.0 dBW 130 cm 40.5 dBW 140 cm 40.0 dBW 150 cm 39.5 dBW 160 cm 39.0 dBW 170 cm 38.5 dBW 180 cm 38.0 dBW 190 cm 37.5 dBW 200 cm 37.0 dBW 210 cm 36.5 dBW 220 cm 36.0 dBW 230 cm 35.5 dBW 240 cm 35.0 dBW 250 cm 34.5 dBW 260 cm

EIRP Field Intensity Antenna diameter 34.0 dBW 270 cm 33.5 dBW 280 cm 33.0 dBW 290 cm 32.5 dBW 300 cm 32.0 dBW 310 cm 31.5 dBW 320 cm 31.0 dBW 330 cm 30.5 dBW 340 cm 30.0 dBW 350 cm 29.5 dBW 360 cm 29.0 dBW 370 cm 28.5 dBW 380 cm 28.0 dBW 390 cm 27.5 dBW 400 cm 27.0 dBW 410 cm 26.5 dBW 420 cm

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