T3B10

RADIO WAVE PROPAGATION · Electromagnetic wave properties: wavelength vs frequency, nature and velocity of electromagnetic waves, relationship of wavelength and frequency; Electromagnetic spectrum definitions: UHF, VHF, HF

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What frequency range is referred to as HF?

A300 to 3000 MHz
B30 to 300 MHz
C3 to 30 MHz
D300 to 3000 kHz

Why The ITU divides the radio spectrum into decade-wide bands, and HF (high frequency) runs from 3 MHz to 30 MHz. This is the classic shortwave range that includes ham bands such as 80, 40, 20, 15 and 10 meters, where ionospheric refraction gives worldwide skip. Wavelengths there run from 100 meters down to 10 meters.

Watch out The choice covering 30 to 300 MHz is VHF, 300 to 3000 MHz is UHF, and 300 to 3000 kHz is MF, the band that holds AM broadcast and 160 meters.

Each band is a decade: MF 0.3-3, HF 3-30, VHF 30-300, UHF 300-3000, all in MHz.

HamSandwich explanation, first draft. The question and answers are the NCVEC text.

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