The frequency spectrum for HE is which range?

The frequency spectrum for HE is which range?

• A. 3-30 MHz
• B. 30-300 MHz
• C. 300-3000 kHz
• D. 30-3000 kHz

Answer: (A)

The range for High Frequency is 3 to 30 MHz. This band is known for long-distance communications because radio waves in this range can reflect off the ionosphere (skywave propagation), allowing signals to travel beyond the horizon with relatively compact antennas. The other options belong to different bands: 30–300 MHz is VHF, which is mainly line-of-sight; 300–3000 kHz is 0.3–3 MHz (MF), and 30–3000 kHz spans LF through MF. So, 3–30 MHz best fits the HE range.

The range for High Frequency is 3 to 30 MHz. This band is known for long-distance communications because radio waves in this range can reflect off the ionosphere (skywave propagation), allowing signals to travel beyond the horizon with relatively compact antennas. The other options belong to different bands: 30–300 MHz is VHF, which is mainly line-of-sight; 300–3000 kHz is 0.3–3 MHz (MF), and 30–3000 kHz spans LF through MF. So, 3–30 MHz best fits the HE range.