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A transmitter has a power output of 125 watts. There is a loss of 0.8 dB in the transmission line, 0.2 dB in the antenna tuner, and a gain of 10 dBd in the antenna. The Effective Radiated Power (ERP) is:
1000
Total system gain/loss = -0.8 dB - 0.2 dB + 10 dB = -1.0 dB + 10 dB = +9 dB. A 9 dB gain is a power ratio of 10^(9/10) ≈ 7.94. ERP = 125W * 7.94 ≈ 992.5W. Alternatively, 10 dB gain is x10 power, 1 dB loss is /1.26. So 125W * (10/1.26) = 125 * 7.93 = 991.9. The answer 1000 suggests the 9dB is taken as a factor of 8 (approximate). 125 * 8 = 1000.
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