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 Ku band (downlink frequencies 10.7 - 12.75 GHz). The values shown in the table assume having an Universal LNB with noise figure of 0.7 dB.

EIRP [dBW]	Dish diameter [cm]
64	22
63	24
62	26
61	28
60	30
59	32
58	34
57	36
56	38
55	40
54	45
53	50
52	50
51	55
50	60
49	60
48	60
47	75
46	80
45	90
44	90
43	100
42	110
41	120
40	120
39	135
38	150
37	180
36	240
35	300
34	355
33	400
32	450

Example of satellite beam map with EIRP values in dBW

Amos 2 - European beam

source: satbroadcasts.com

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