Morse code, SOS signal transmission:
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Morse code, reception, transfer
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Brown noise
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Interference Broadcasting
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Radar, location alert
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High frequency signal
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High frequency pulsating electronic signal
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Police radio
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Energy buildup, Electronic signal
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Low frequency pulsing and humming signal
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Geiger counter
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Electronic signal
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High-frequency squeak, Low-frequency rumble
★★★★★