GBZ
Encyclopedia
GBZ is the call sign of a British
VLF
transmitter on 19.6 kHz from Anthorn, Cumbria
(formerly from Criggion
, Powys
), which is involved with transmitting encrypted signals to submarines. Although the signals of GBZ cannot be decrypted by common means, its reception - if its signal is shown in the form of spectrograms - is very interesting, because the signals of GBZ show figures looking like fishes, garlands and ornaments on the spectrogram
s. At certain times these signals are also transmitted as strong pulses, so-called superpulse
s, which can oversteer the amplifier of a PC
soundcard at distances of a hundred kilometres away from transmission site.
United Kingdom
The United Kingdom of Great Britain and Northern IrelandIn the United Kingdom and Dependencies, other languages have been officially recognised as legitimate autochthonous languages under the European Charter for Regional or Minority Languages...
VLF
Very low frequency
225px|thumb|right|A VLF receiving antenna at [[Palmer Station]], Antarctica, operated by Stanford UniversityVery low frequency or VLF refers to radio frequencies in the range of 3 kHz to 30 kHz. Since there is not much bandwidth in this band of the radio spectrum, only the very simplest signals...
transmitter on 19.6 kHz from Anthorn, Cumbria
Cumbria
Cumbria , is a non-metropolitan county in North West England. The county and Cumbria County Council, its local authority, came into existence in 1974 after the passage of the Local Government Act 1972. Cumbria's largest settlement and county town is Carlisle. It consists of six districts, and in...
(formerly from Criggion
Criggion VLF transmitter
Criggion radio station was a transmitter site latterly operated by BT on behalf of the UK Ministry of Defence. It was located near the village of Criggion in the parish of Bausley with Criggion, which lies in the county of Powys, Wales...
, Powys
Powys
Powys is a local-government county and preserved county in Wales.-Geography:Powys covers the historic counties of Montgomeryshire and Radnorshire, most of Brecknockshire , and a small part of Denbighshire — an area of 5,179 km², making it the largest county in Wales by land area.It is...
), which is involved with transmitting encrypted signals to submarines. Although the signals of GBZ cannot be decrypted by common means, its reception - if its signal is shown in the form of spectrograms - is very interesting, because the signals of GBZ show figures looking like fishes, garlands and ornaments on the spectrogram
Spectrogram
A spectrogram is a time-varying spectral representation that shows how the spectral density of a signal varies with time. Also known as spectral waterfalls, sonograms, voiceprints, or voicegrams, spectrograms are used to identify phonetic sounds, to analyse the cries of animals; they were also...
s. At certain times these signals are also transmitted as strong pulses, so-called superpulse
Superpulse
Superpulse is a term for very strong man-made radio signals. The two most common instances of superpulses are those transmitted by the VLF transmitter GBZ, and occasionally by an unidentified station on 17.8 kHz....
s, which can oversteer the amplifier of a PC
Personal computer
A personal computer is any general-purpose computer whose size, capabilities, and original sales price make it useful for individuals, and which is intended to be operated directly by an end-user with no intervening computer operator...
soundcard at distances of a hundred kilometres away from transmission site.
External links
- http://www.vlf.it/trond2/15-20khz.html
- Spectrogram of superpulse
