T3B09

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 UHF?

A30 to 300 kHz
B30 to 300 MHz
C300 to 3000 kHz
D300 to 3000 MHz

Why The ITU divides the spectrum into decades, each band spanning from X to 10X. Ultra High Frequency (UHF) runs from 300 MHz to 3000 MHz (3 GHz), which corresponds to wavelengths of 1 meter down to 10 centimeters. The ham bands at 70 cm (420-450 MHz), 33 cm, and 23 cm all fall in UHF.

Watch out The 30 to 300 MHz choice is VHF, the band just below UHF that contains the popular 2 meter and 6 meter bands, so watch the units and the decade carefully.

HF 3-30 MHz, VHF 30-300 MHz, UHF 300-3000 MHz: each step multiplies by 10.

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

T3B09

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