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Frequency Bands : EHF, SHF, UHF, VHF, HF, MF, LF, VLF and Their Uses


Frequency Bands and Their Uses

1. Extremely High Frequency (EHF) 30 - 300 GHz

Uses

2. Super High Frequency (SHF) 3 - 30 GHz

Uses

3. Ultra High Frequency (UHF) 300 - 3000 MHz

Uses

  • Satellite Communication
  • Television
  • Surveillance
  • Navigation aids

Also, read important wireless communication terms

4. Very High Frequency (VHF) 30 - 300 MHz

Uses

  • Television
  • FM broadcast
  • Navigation aids
  • Air traffic control

5. High Frequency (HF) 3 - 30 MHz

Uses

  • Telephone
  • Telegram and Facsimile
  • Ship to coast / ship to aircraft communication
  • Amateur radio

6. Medium Frequency (MF) 300 - 3000 KHz

Uses

  • Coast guard communication
  • Direction finding
  • AM broadcasting
  • Maritime radio

7. Low Frequency (LF) 30 - 300 KHz

Uses

  • Radio beacons
  • Navigational aids

8. Very Low Frequency (VLF) 3 - 30 KHz

Uses

  • Navigation
  • SONAR

Some Important Questions about Different Frequency Bands

Q. What is -3dB frequency response or -3dB bandwidth?

A. At the circuit level, the phrase -3dB frequency response is frequently used. In short, a -3dB frequency response indicates that the signal's power has decreased to half of what it was initially. The frequency at which the output gain is lowered to 70.71% of its highest value is defined by these -3dB corner frequency points. Then, we can rightly state that the frequency at which the system gain has decreased to 0.707 of its maximum value is at the -3dB point. [Read More]

Further Reading

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