Superpulse

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Superpulse is the name for very strong radio signals, which are transmitted by the VLF transmitter GBZ and by an unidentified station on 17.8 kHz at certain times. The purpose of superpulses is unknown. Superpulses can overdrive the front-end amplifier of a PC several hundred kilometres away from the transmitter, when a PC with an aerial attached to its soundcard is used as a VLF receiver.