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Very high frequency (VHF) is the ITU designation for the range of radio frequency electromagnetic waves (radio waves) from 30 to 300 megahertz (MHz), with corresponding wavelengths of ten meters to one meter. Frequencies immediately below VHF are denoted high frequency (HF), and the next higher frequencies are known as ultra high frequency (UHF).
- Marine VHF Radio
A standard handheld marine VHF, mandatory on larger seagoing...
- Sincgars
Single Channel Ground and Airborne Radio System (SINCGARS)...
- Marine VHF Radio
High-frequency transformers operating in the tens to hundreds of kilohertz often have windings made of braided Litz wire to minimize the skin-effect and proximity effect losses. Large power transformers use multiple-stranded conductors as well, since even at low power frequencies non-uniform distribution of current would otherwise exist in high ...
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Flyback transformer. A flyback transformer (FBT), also called a line output transformer (LOPT), is a special type of electrical transformer. It was initially designed to generate high-voltage sawtooth signals at a relatively high frequency.
10 3 –100 km: Ultra low frequency: ULF — 3–30 kHz 100–10 km: Very low frequency: VLF — 30–300 kHz 10–1 km: Low frequency: LF — 300 kHz – 3 MHz 1 km – 100 m: Medium frequency: MF — 3–30 MHz 100–10 m: High frequency: HF: HF: 30–300 MHz 10–1 m: Very high frequency: VHF: VHF: 300 MHz – 3 GHz 1 m – 100 mm: Ultra ...
Skin effect. Distribution of current flow in a cylindrical conductor, shown in cross section. For alternating current, current density decreases exponentially from the surface towards the inside. Skin depth, δ, is defined as the depth where the current density is just 1/e (about 37%) of the value at the surface; it depends on the frequency of ...
A Tesla coil is an electrical resonant transformer circuit designed by inventor Nikola Tesla in 1891. [1] . It is used to produce high- voltage, low- current, high- frequency alternating-current electricity.
In 1897 he patented a device called the high-voltage, resonant transformer or "Tesla coil." Transferring electrical energy from the primary coil to the secondary coil by resonant induction, a Tesla coil is capable of producing very high voltages at high frequency. The improved design allowed for the safe production and utilization of high ...
