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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).
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Timeline A Marine Corps 2ndLt operates a PRC 119 during...
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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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Frequencies immediately below HF are denoted medium frequency (MF), while the next band of higher frequencies is known as the very high frequency (VHF) band. The HF band is a major part of the shortwave band of frequencies, so communication at these frequencies is often called shortwave radio .
- 100 to 10 m
- 3 to 30 MHz
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.
- 243KB
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Mar 26, 2018 · 1 Answer. Sorted by: 2. High freguency isn't a well defined term. Most of us surely think that HF transformers are complex to design, analyze and make, because several non-idealities grow substantially as the frequency increases.
Jul 1, 2020 · Abstract. With the increasing demand for volume reduction and efficiency improvement, very high frequency (VHF) power converters (30–300 MHz) have attracted great interest. Under such high operating frequency conditions, the value and volume of passive components can be greatly reduced, and the power density can be improved.
Dec 7, 2023 · Key Takeaways. Ferrite cores are pivotal in modern electronics, particularly high-frequency transformers. Their significance lies in several advantages that greatly impact electronic devices. These cores reduce energy loss, enable efficient energy transfer, and manage high frequencies effectively.
