Discussion
Which quantity would you use to compare two transmitting stations of different power and antenna?
Answer: B
EIRP combines transmitter power and antenna gain into the single number that determines the field a distant receiver sees in the main beam, so it is the correct basis for comparison and the quantity regulators limit. Radiation resistance is a circuit property, standing wave ratio describes the match rather than the output, and beamwidth describes coverage. Choosing the right figure of merit is half the work in any system level comparison.
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