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A local amateur reports your 100W 2M simplex VHF transmission as 30 dB over S9. To reduce your signal to S9, you would reduce your power to ______ watts.
100 mW
To reduce the signal by 30 dB, you need to decrease the power by a factor of 1000 (since 10 dB = x10, 20 dB = x100, 30 dB = x1000). Power = 100 W / 1000 = 0.1 W = 100 mW.
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