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...

Extremely low frequency (ELF) is the ITU designation for electromagnetic radiation (radio waves) with frequencies from 3 to 30 Hz, and corresponding wavelengths...

Low frequency (LF) is the ITU designation for radio frequencies (RF) in the range of 30–300 kHz. Since its wavelengths range from 10–1 km, respectively...

in the 3–120 Hz frequency range. This track is normally sent to a subwoofer—a loudspeaker designed to reproduce very low frequencies. LFE channels originated...

various types of slow earthquake: low frequency earthquakes (LFE) very low frequency earthquakes (VLF) and deep-low-frequency earthquakes slow slip events...

infrared, microwave, radio waves, and low-frequency radio frequency (very low frequency, extremely low frequency) are all examples of non-ionizing radiation...

frequency or wavelength. The spectrum is divided into separate bands, with different names for the electromagnetic waves within each band. From low to...

beam. Some of the main capabilities of HAARP include: Generating very low frequency (VLF) radio waves by modulated heating of the auroral electrojet,...

wavelengths bend or reflect very little and travel along the line of sight. Very low frequency (VLF) refers to a frequency range of 30 Hz to 3 kHz which...

Transmitting messages to these submarines is an active area of research. Very low frequency (VLF) radio waves can penetrate seawater just over one hundred feet...

A whistler is a very low frequency (VLF) electromagnetic (radio) wave generated by lightning. Frequencies of terrestrial whistlers are 1 kHz to 30 kHz...

during and after a nuclear attack. The system used both very low frequency (VLF), and low frequency (LF) radio bands. SLFCS was used for United States nuclear...

very few radio systems use frequencies below this. A second limit is the decreasing bandwidth available at low frequencies, which limits the data rate...

name often given to widespread reports of a persistent and invasive low-frequency humming, rumbling, or droning noise audible to many but not all people...

A rotary woofer is a subwoofer-style loudspeaker which reproduces very low frequency content by using a conventional speaker voice coil's motion to change...

The Low-Frequency Array (LOFAR) is a large radio telescope, with an antenna network located mainly in the Netherlands, and spreading across 7 other European...

Radio frequency (RF) is the oscillation rate of an alternating electric current or voltage or of a magnetic, electric or electromagnetic field or mechanical...

Low-frequency oscillation (LFO) is an electronic frequency that is usually below 20 Hz and creates a rhythmic pulse or sweep. This is used to modulate...

the world to have developed the Very low frequency communication capability. On 31 July 2014, a new Very low frequency facility was inaugurated at INS...

As the frequency drops, the losses decrease and the achievable range increases. Military very low frequency (VLF) and extremely low frequency (ELF) communication...

Very high frequency (VHF) is the ITU designation for the range of radio frequency electromagnetic waves (radio waves) from 30 to 300 megahertz (MHz),...

Super low frequency (SLF) is the ITU designation for electromagnetic waves (radio waves) in the frequency range between 30 hertz and 300 hertz. They have...

air to bubble through slowly with a popping or rattling sound of a very low frequency. During this phonation, the arytenoid cartilages in the larynx are...

Infrasound, sometimes referred to as low frequency sound, describes sound waves with a frequency below the lower limit of human audibility (generally...

communicate on virtually every radio frequency band from very low frequency (VLF) up through super high frequency (SHF) using a variety of modulations...

loudspeaker designed to reproduce low-pitched audio frequencies, known as bass and sub-bass, that are lower in frequency than those which can be (optimally)...

e. frequencies up to 300 kilohertz (kHz), including the International Telecommunication Union's (ITU's) low frequency (LF, 30–300 kHz) and very low frequency...

out the very-low frequency signal, so that it can be sent to a subwoofer, and then sending the remaining low-, mid- and high-range frequencies to five...

VLF cable testing (Very Low Frequency) is a technique for testing of medium and high voltage (MV and HV) cables. VLF systems are advantageous in that they...

enabling ships and aircraft to determine their position by receiving very low frequency (VLF) radio signals in the range 10 to 14 kHz, transmitted by a global...