GBZ is the callsign of a British VLF transmitter, which transmits on 19.6 kHz from Anthorn (at earlier time Criggion) cooded signals to submarines. Although the signals of GBZ cannot be decoded by common means, is its reception - if its signal is hown in form of spectrograms - very interesting, because the signals of GBZ show on the spectrograms figures looking like fishes, garlands and ornaments. At certain times these signals are also transmitted as strong pulses, such called superpulses, which can oversteer the amplifier of a PC-soundcard in distances of hundred kilometres away from transmission site.
http://www.vlf.it/harald/strangerec.htm
http://www.vlf.it/trond2/15-20khz.html
Spectrogram of superpulse (http://www.lwca.org/mbarchiv/pix/19600_2b.jpg)
GBZ is the callsign of a British VLF transmitter, which transmits on 19.6 kHz from Anthorn (formerly Criggion) encoded signals to submarines.
Although the signals of GBZ cannot be decoded by common means, its reception - if its signal is shown in form of spectrograms - is very interesting, because the signals of GBZ show figures looking like fishes, garlands and ornaments on the spectrograms.
At certain times these signals are also transmitted as strong pulses, so-called superpulses, which can oversteer the amplifier of a PC soundcard at distances of a hundred kilometres away from transmission site.
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