extremely low frequency การใช้

• Extremely low frequency waves have a wavelength of ~ 10, 000km-100, 000km.
• Omega stations used very extensive antennas to transmit their extremely low frequencies.
• Shortwave radio uses extremely low frequencies of the electromagnetic band.
• Becker believed that extrasensory perception could occur from extremely low frequency ( ELF ) waves.
• It was designed to be a proof-of-concept for collecting extremely low frequency earthquake precursor signals from space.
• The currents are extremely low frequency and travel over large areas at or near the surface of the Earth.
• Haplogroup G2a1 has an extremely low frequency in almost all populations except in the area of the Caucasus Mountains.
• The term " "'super "'extremely low frequency " has been used to describe electromagnetic radiation below the 3 Hz threshold.
• Haplogroup G1 has an extremely low frequency in almost all countries except Iran and the countries adjoining Iran on the west.
• The technique is not very precise but it will measure any waveform at any frequency ( except for extremely low frequencies ).
• At extremely low frequencies, below about 1 kHz, the wavelength is long enough for long-distance communication, although at a slow data rate.
• This airborne communications capability largely replaced the land-based extremely low frequency ( ELF ) broadcast sites that became vulnerable to nuclear strike.
• And the pacemakers responded to only one brand of magnetic audio-frequency systems, which use extremely low frequencies and create a moderate magnetic field.
• Home bases can then use extremely low frequency radio signals, able to penetrate the ocean's surface, to reach submarines wherever they might be.
• The Schumann resonance is a set of spectrum peaks in the extremely low frequency ( ELF ) portion of the Earth's electromagnetic field spectrum.
• He imagined a system specifically for medium-accuracy global navigation, and thus selected the extremely low frequency of 10 kHz as the basis for the signal.
• During a positive lightning strike, huge quantities of extremely low frequency ( ELF ) and very low frequency ( VLF ) radio waves are generated.
• Project ELF, named for its extremely low frequency radio waves, uses an antenna network to transmit coded messages to submarines in deep waters around the world.
• The earth is continuously vibrating, although at extremely low frequencies ( on the order of once every couple of hundred seconds or so ) and amplitudes.
• Clam Lake is the site of a U . S . Navy extremely low frequency ( ELF ) transmitter site, used to communicate with deeply submerged submarines.