Radio
Frequency Spectrum
Radio waves are measured in
units called Hertz ( Hz ) . One cycle of
electric current is equal to one complete
radio wave. How many of these
waves are generated in one
second determines its frequency.
The radio frequency spectrum has
been subdivided into a number of
frequency bands ; these are given
below :-
| Frequency band |
Classification |
Abbreviation |
| Below 300 Hz |
Extremely low |
ELF |
| 300 Hz-3 kHz |
Infra low |
ILF |
| 3 kHz-30 kHz |
Very low |
VLF |
| 30 kHz-300 kHz |
Low |
LF |
| 300 kHz-3 MHz |
Medium |
MF |
| 3 MHz-30 MHz |
High |
HF |
| 30 MHz-300 MHz |
Very high |
VHF |
| 300 MHz-3 GHz |
Ultra high |
UHF |
| 3 GHz-30 GHz |
Super high |
SHF |
| 30 GHz-300 GHz |
Extremely high |
EHF |
| 300 GHz-3000 GHz |
Tremendously high |
THF |
INDEX