Which spectrum range spans 3-30 MHz?

Which spectrum range spans 3-30 MHz?

• A. HE
• B. LF
• C. MF
• D. VHF

Answer: (A)

Spectrum ranges are defined by standard named bands. From bottom to top, LF covers about 30 kHz to 300 kHz, MF is about 300 kHz to 3 MHz, and HF spans roughly 3 to 30 MHz. The 3–30 MHz range sits squarely in the High Frequency band, which is why it’s the correct label for that span. The lower bands end below 3 MHz (LF and MF), while VHF starts at 30 MHz, so they don’t match this interval. Some sources may label it differently, but the widely used designation for 3–30 MHz is High Frequency (HF).

Spectrum ranges are defined by standard named bands. From bottom to top, LF covers about 30 kHz to 300 kHz, MF is about 300 kHz to 3 MHz, and HF spans roughly 3 to 30 MHz. The 3–30 MHz range sits squarely in the High Frequency band, which is why it’s the correct label for that span. The lower bands end below 3 MHz (LF and MF), while VHF starts at 30 MHz, so they don’t match this interval. Some sources may label it differently, but the widely used designation for 3–30 MHz is High Frequency (HF).