EIRP (Effective Isotropic Radiated Power) is the amount of power that a theoretical isotropic antenna (which evenly distributes power in all directions) would emit to produce the peak power density observed in the direction of maximum antenna gain.

The EIRP is often stated in terms of decibels over a reference power emitted by an isotropic radiator with an equivalent signal strength (for example: dBm or dBW).

Following table contains EIRP values for the c band (downlink frequencies 3.4 - 4.2 GHz). The values shown in the table assume having an LNB with noise figure of 20°K:

EIRP [dBW]	Dish diameter [cm]
42.0	110
41.5	120
41.0	130
40.5	140
40.0	150
39.5	160
39.0	170
38.5	180
38.0	190
37.5	200
37.0	210
36.5	220
36.0	230
35.5	240
35.0	250
34.5	260
34.0	270
33.5	280
33.0	290
32.5	300
32.0	310
31.5	320
31.0	330
30.5	340
30.0	350
29.5	360
29.0	370
28.5	380
28.0	390
27.5	400
27.0	410
26.5	420

Example of satellite coverage map with EIRP values in dBW

Intelsat 17 (66ºE) - Global Beam)

source: satbroadcasts.com

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