VLF - определение. Что такое VLF
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Что (кто) такое VLF - определение

THE 3-30 KHZ RANGE OF THE ELECTROMAGNETIC SPECTRUM
VLF; Very Low Frequency; Vlf; VLF Receiver
  • A "triatic" or "flattop" antenna, another common VLF transmitting antenna. It consists of vertical radiator wires each connected at top to parallel horizontal capacitive topload wires stretching up to a kilometer, supported on tall towers. The transverse support cables suspending the horizontal wires are called "triatics".
  • Timing diagram of a frequency-shift keyed 18.1 kHz VLF signal, picked up using a small [[loop antenna]] and a sound card. The Morse code says "..33376.."; the vertical stripes are distant lightning strikes.
  • A VLF receiving antenna at [[Palmer Station]], Antarctica, operated by [[Stanford University]]

VLF         
Very-Low-Frequency Band
VLF         
¦ abbreviation very low frequency (denoting radio waves of frequency 3-30 kHz and wavelength 10-100 km).
VLF         
Virtual Lookaside Facility (Reference: IBM)

Википедия

Very low frequency

Very low frequency or VLF is the ITU designation for radio frequencies (RF) in the range of 3–30 kHz, corresponding to wavelengths from 100 to 10 km, respectively. The band is also known as the myriameter band or myriameter wave as the wavelengths range from one to ten myriameters (an obsolete metric unit equal to 10 kilometers). Due to its limited bandwidth, audio (voice) transmission is highly impractical in this band, and therefore only low data rate coded signals are used. The VLF band is used for a few radio navigation services, government time radio stations (broadcasting time signals to set radio clocks) and for secure military communication. Since VLF waves can penetrate at least 40 meters (131 ft) into saltwater, they are used for military communication with submarines.