High frequency - Wikipedia
High frequency (HF) is the ITU designation [1] for the band of radio waves with frequency between 3 and 30 megahertz (MHz). It is also known as the decameter band or decameter wave as its wavelengths range from one to ten decameters (ten to one hundred meters).
Electromagnetic spectrum - Wikipedia
Gamma rays, at the high-frequency end of the spectrum, have the highest photon energies and the shortest wavelengths—much smaller than an atomic nucleus. Gamma rays, X-rays, and extreme ultraviolet rays are called ionizing radiation because their high photon energy is able to ionize atoms, causing chemical reactions.
Electromagnetic Spectrum - The Physics Hypertextbook
Thus low frequency (LF) is also called long wave (LW), medium frequency (MF) is also called medium wave (MW), and high frequency (HF) is also called short wave (SW). ‡ This designation is not official, but I like it.
24.3: The Electromagnetic Spectrum - Physics LibreTexts
Three rules that apply to electromagnetic waves in general are as follows: High-frequency electromagnetic waves are more energetic and are more able to penetrate than low-frequency waves. High-frequency electromagnetic waves can carry more information per unit time than low-frequency waves.
23.1: The Electromagnetic Spectrum - Physics LibreTexts
Extremely high frequency (EHF) is the highest microwave frequency band. EHF runs the range of frequencies from 30 to 300 gigahertz, above which electromagnetic radiation is considered as far infrared light, also referred to as terahertz radiation.
Use of the HF spectrum to design and implement communications systems that take advantage of the physical properties of the HF Radio Channel. Why use HF for Communications? HF's single greatest value is its ability to provide reliable short AND long-range Beyond Line Of Sight (BLOS) communications.
What is High Frequency (HF)? - Definition from Techopedia
2015年10月29日 · High frequency (HF) is an electromagnetic frequency defined by the International Telecommunications Union (ITU) for radar and radio communications. It operates in a range of three to thirty MHz and as the wavelengths spread over ten to one hundred meters, it is also known as decameter wave and designated as band 7.
HF | frequency band | Britannica
High-frequency (HF) radio is in the 100- to 10-metre wavelength band, extending from 3 megahertz to 30 megahertz. Much of the HF band is allocated to mobile and fixed voice communication services requiring transmission bandwidths of less than 12 kilohertz.
High frequency Definition & Meaning - Merriam-Webster
2024年11月5日 · The meaning of HIGH FREQUENCY is a radio frequency between very high frequency and medium frequency.
HF (High frequency) - Telecom Trainer
2023年4月13日 · High frequency (HF) radio communication is a powerful tool for long-range communication, particularly in remote or inaccessible areas. It allows communication over thousands of miles, even beyond the horizon, and is less susceptible to interference and jamming than other forms of communication.