EIRP values for C band (EIRP vs dish size comparison) - satbroadcasts.com
EIRP values for C band (EIRP vs dish size comparison)
Effective Isotropic Radiated Power vs antena diameter values for C Band.
 
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).
 
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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 20K:

EIRP [dBW]Dish diameter [cm]
42.0110
41.5120
41.0130
40.5140
40.0150
39.5160
39.0170
38.5180
38.0190
37.5200
37.0210
36.5220
36.0230
35.5240
35.0250
34.5260
34.0270
33.5280
33.0290
32.5300
32.0310
31.5320
31.0330
30.5340
30.0350
29.5360
29.0370
28.5380
28.0390
27.5400
27.0410
26.5420

Example of satellite coverage map with EIRP values in dBW

Intelsat 17 (66E) - Global Beam)
 
source: satbroadcasts.com
 
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