WHAT ARE RADIO FREQUENCIES?

What are radio frequencies?


Radiofrequency (RF) is a measurement that represents the electromagnetic radiation spectrum, or oscillation rate of electromagnetic radio waves, with radio frequencies ranging from low frequencies from 300 GHz to 9 kHz. With the use of antennas and transmitters, an RF field can be used for various types of wireless transmissions and communications.


Radiofrequency is being used in many areas, but in terms of information and communication technology, it refers to the frequency band over which wireless telecommunications signals are being transmitted. The frequency band is being divided into different parts, which will later be assigned to different technical industries, this is known as the radio spectrum.


For example, the VHF (Very High Frequency) band, ranging from 30–300 MHz, is being used for FM radio, TV broadcasting, and amateur radio. For many electronic communication devices, ultra-high frequency (UHF) bands are being used. It is a location used by mobile phones, wireless LANs, Bluetooth and TVs, and land radios.


RADIO FREQUENCIES

How Radio Frequency Work


Radio frequencies are measured in units called Hertz, which represent the number of cycles per second when a radio wave is transmitted. One hertz is equal to one cycle per second; Radio waves range from thousands (kHz) to millions (megahertz) to billions (gigahertz) per second. A microwave is a type of radio wave that has high frequencies. Radiofrequency is not visible to the human eye.


In a radio wave, the wavelength is inversely proportional to the frequency. If f is the frequency in megahertz and s is the wavelength in meters, then


S=300/f


Radiofrequency technology


Many types of wireless devices use RF fields. Cordless cell phones, radio and television broadcasting stations, Wi-Fi and Bluetooth, satellite communications systems, and two-way radios all operate across the RF spectrum. In addition, other equipment outside of communications, including microwave ovens and garage door openers, operate at radio frequencies. Some wireless devices, such as TV remote controls, some cordless computer keyboards, and computer icons, operate at IR frequencies that have electromagnetic wavelengths.


Features of radiofrequency


The characteristics of RF include the following


  1. Low power (usually transmit less than 1mW)
  2. RF has a good operating range (3 to 30 meters)
  3. It supports data rates from 1 to 2Mbps
  4. It penetrates the walls
  5. It does not require live broadcasting

Applications of radiofrequency


  1. Vehicle monitoring
  2. remote controlled
  3. Telemetry
  4. Wireless meter reading
  5. Access control systems
  6. Small range wireless network
  7. Wireless home security system
  8. Industrial data acquisition system
  9. Wireless data terminal
  10. Wireless data transmission
  11. Biological signal acquisition
  12. Robot remote control
  13. Digital Audio / Video Broadcasting
  14. Digital home automation such as remote lights or remote switches
  15. Industrial remote control, remote sensing, and telemetry
  16. Wireless transmission of alarm systems and various types of low-rate digital signals
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