High frequency (HF) is the ITU designation [1] [2] 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).

2023年9月18日 · The HF frequency range, also known as the high-frequency range, refers to the portion of the electromagnetic spectrum that encompasses frequencies between 3 and 30 MHz. This range is widely used in various communication systems due to its unique characteristics.

2024年5月5日 · Very High Frequency (VHF) Very high frequency is one of the most commonly used RF bands, with an operating range from 30 MHz to 300 MHz. VHF frequency has been widely used in analog TV broadcasting since it started a few decades ago. FM radio broadcasting from 88 to 108 MHz operates in the VHF frequency band.

2024年4月30日 · High frequency refers to electromagnetic wave frequencies that are higher than other specific frequency ranges, usually between MHz and GHz. The shorter wavelengths and higher energies of electromagnetic waves in this range are suitable for applications such as wireless communications, radar, and medical imaging.

Extremely high frequency (EHF) is the International Telecommunication Union designation for the band of radio frequencies in the electromagnetic spectrum from 30 to 300 gigahertz (GHz). [1] [2] It is in the microwave part of the radio spectrum, between the …

2021年6月1日 · What is HF radio? Known as the decameter band or decameter wave, high frequency (HF) is the ITU designation[1] for the range of radio frequency electromagnetic waves (radio waves) between 3 and 30 megahertz (MHz). The HF band is a major part of the shortwave band of frequencies, so communication at these frequencies

High frequency (HF) is the ITU designation 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).

High Frequency Communications – An Introductory Overview - Who, What, and Why? Abstract: Over the past 60+ years the use and interest in the High Frequency (HF -> covers 1.8 – 30 MHz) band as a means to provide reliable global communications has come and gone

2025年3月8日 · Understanding High-Frequency Sound. To explain high-frequency sound, I want to start by stepping into the world of ultrasound. Again, these are sound waves that vibrate at frequencies higher than 20,000 Hz (or 20 kHz). You’ve probably heard the term “ultrasound” before, usually in the context of medical imaging, where doctors use it to ...

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.