ARRL Technician Practice Exam

What are the frequency limits of the UHF spectrum?

1. 30 to 300 MHz

2. 300 to 3000 MHz

3. 3 to 30 MHz

4. 300 to 300 MHz

The correct answer is: 300 to 3000 MHz

The UHF (Ultra High Frequency) spectrum is defined by its range of frequencies, which extends from 300 MHz to 3000 MHz. This band is commonly utilized for various forms of communication, including television broadcasts, mobile phones, and two-way radios. Understanding this frequency range helps grasp the applications and propagation characteristics unique to UHF. For instance, higher frequencies within the UHF range are particularly effective for line-of-sight communication, and the shorter wavelengths allow for compact antennas, making UHF a popular choice for many modern communication devices. The other choices misrepresent the UHF spectrum's frequency limits. Frequencies such as 30 to 300 MHz fall within the VHF (Very High Frequency) range, while the range from 3 to 30 MHz pertains to the HF (High Frequency) band. The last option incorrectly states a frequency range that isn't valid within standard nomenclature for UHF. Recognizing these distinctions is essential for understanding radio communications and the technology that operates within these bands.