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There is a system of formal designation of the region of the electromagnetic

spectrum that we know how to generate and modulate for communication.

The naming system differentiates among arbitrary sections of "radio" based

on slices of decades (10 times) of frequency and wavelength. You'll recognize

some of the abbreviations, like VHF and UHF:

Very Low Frequency (VLF)

3 - 30 KHz

100,000 - 10,000 meters

Low Frequency (LF)

30 - 300 KHz

10,000 - 1,000 meters

Medium Frequency (MF)

300 KHz - 3 MHz

1,000 - 100 meters

High Frequency (HF)

3 - 30 MHz

100 - 10 meters

Very High Frequency (VHF)

30 - 300 MHz

10 - 1 meter

Ultra High Frequency (UHF)

300 MHz - 3 GHz

1 meter - 10 cm

Super High Frequency (SHF)

3 - 30 GHz

10 - 1 cm

Extreme High Frequency (EHF)

30 - 300 GHz

1 cm - 1 mm

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