Record a local radio system and share it with the world. If you have a spare computer, it is easy to get started. With a $25 SDR or two, you can capture an entire system.

The radio spectrum is the part of the electromagnetic spectrum with frequencies from 3 Hz to 3,000 GHz (3 THz). Electromagnetic waves in this frequency range, called radio waves, are widely used in modern technology, particularly in telecommunication.

Radio frequency (RF) is the oscillation rate of an alternating electric current or voltage or of a magnetic, electric or electromagnetic field or mechanical system in the frequency [1] range from around 20 kHz to around 300 GHz.

2023年4月10日 · Most radios that you see in your everyday life are single-purpose radios. For example, an AM radio can listen to any AM radio station in the frequency band from 535 kilohertz to 1.7 megahertz, but nothing else. An FM radio can listen to any FM radio station in the band from 88 to 108 megahertz and nothing else.

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2024年5月5日 · 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.

Frequencies above 30 MHz are referred to as Very High Frequency (VHF) region and those above 300 MHz are called Ultra High Frequency (UHF). The allocated bands for amateurs are many megahertz wide, allowing for high-fidelity audio transmission modes ( FM ) and very fast data transmission modes that are unfeasible for the kilohertz -wide ...

Now you can listen to the live broadcast of all FM and AM radio stations from major cities around the world. Just select a city on the map, review the full frequency list and click on the station name to listen online. Happy listening! Selected stations - listen live right now!

In ham radio, understanding the relationship between frequency and wavelength is essential for effective radio operating. The frequency of a radio wave is the number of cycles it completes per second, measured in hertz (Hz). Wavelength, on the other hand, is the physical length of one cycle, measured in meters.

2017年5月13日 · The radio spectrum from 100 kHz to 30 MHz . For easy printing: This list can be downloaded as a PDF file here. A typical tuning range on most HF Communication Receivers sold today is from about 100 kHz to 30 MHz. By international agreement, the radio spectrum has been divided up among various users.