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A transmitter has an output power of 200 watts. The coaxial and connector losses are 3 dB in total, and the antenna gain is 9 dBd. What is the approximate Effective Radiated Power of this system?
800 watts
Transmitter power = 200W. Line loss = 3dB (power ratio 0.5). Power to antenna = 200W * 0.5 = 100W. Antenna gain = 9dBd (power ratio approx 8, since 3dB=x2, 6dB=x4, 9dB=x8). ERP = 100W * 8 = 800W. Or in dB: 10log(200) - 3dB + 9dB = 23dBW - 3dB + 9dB = 29dBW. 10^(29/10) = 10^2.9 ≈ 794W ≈ 800W.
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