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A transmitter has a power output of 100 watts. There is a loss of 1.30 dB in the transmission line, a loss of 0.2 dB through the antenna tuner, and a gain of 4.50 dBd in the antenna. The Effective Radiated Power (ERP) is:
200 watts
Total system gain/loss = -1.30 dB (line) - 0.2 dB (tuner) + 4.50 dB (antenna) = +3.0 dB. A 3 dB net gain means the power is doubled. ERP = 100W * 2 = 200W.
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