25 Radio Propagation
The Broadcast Range of Frequencies
Effective Isotropically Radiated Power (EIRP)
This is the product of power fed to the actual antenna multiplied by the antenna gain with respect to an isotropic antenna which radiates uniformly in all directions. Figure 135 shows how the power density varies with distance for an EIRP of 1 kW.
Figure 135 Variation of power density with distance for an EIRP of 1 kW.The reference (0 dB) at 1 km is approximately 7.96 × 10−5 W/m
Reference Field Strength
This is 1 μV/m. Other fields are usually ...
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