Assertion: radio wave's amplitude | /r/HasProperty | interspersed with gaps of no signal
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Source sentences:
text: In order to transmit information, the continuous wave must be turned off and on with a telegraph key to produce the different length pulses, "dots" and "dashes", that spell out text messages in Morse code, so a "continuous wave" radiotelegraphy signal consists of pulses of sine waves with a constant amplitude interspersed with gaps of no signal.