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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
Power transformer overexcitation condition caused by decreased frequency; flux (green), iron core's magnetic characteristics (red) and magnetizing current (blue). Operation of a transformer at its designed voltage but at a higher frequency than intended will lead to reduced magnetizing current.
There are three primary types of voltage transformers (VT): electromagnetic, capacitor, and optical. The electromagnetic voltage transformer is a wire-wound transformer. The capacitor voltage transformer uses a capacitance potential divider and is used at higher voltages due to a lower cost than an electromagnetic VT.
High-frequency insertion loss is attributed to interwinding capacitance, series (leakage) inductance, and core and conductor losses. At high temperature it tends to become greater due to increase in the loss component of core permeability. Figure 3. Typical Frequency Response of an RF Transformer.
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1 LECTURE 34 HIGH FREQUENCY TRANSFORMER A. Transformer Basics 1. Geometry of Cu Wire Windings and Core Wire Winding Window 2. Single Wire Skin Effect and Multi-wire Proximity Effects Alter Both Primary and Secondary R(wire coil) via Effective A cu (wire) Changes 3. Transformer Inductance’s: L m and L l a. Magnetizing Inductance, L m: Core Flux b.
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difference, Eq. 1 and 2 can be used to find the voltage gain and phase shift at each single frequency. The frequency response is obtained by plotting the voltage gain and phase shift on the y-axis12) verses the frequency on the x-axis using any graphing tool.
Jul 1, 2020 · There are two choices for high-frequency inductors or transformers, i.e. with a magnetic core and without magnetic core (air core). With the help of the magnetic core, the volume can be greatly reduced compared with the air core one under the same inductance in ideal condition, as well as the magnetic field can be well controlled.
