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- "Right at 1,200 Hz, signal tones can be detected if they have sound pressure levels of 57 dB or larger. This is 3dB below the noise. This means that Morese Code can be received when the signal power is comparable to the noise power within the critical bandwidth. By contract, an AM or TV boadcaster aims at 50-dB signal-to-noise ratios over much larger bandwidths to provide a clear sound and picture. This means that the NorCal* 40A can communicate at distances of thousands of mile with a transmitter power of 2 W, whereas a broadcaster might use 50 kW for coverage in a single city."
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