What is the correct unit for an ILS frequency?

What is the correct unit for an ILS frequency?

• A. Hz
• B. KHz
• C. MHz
• D. GHz

Answer: (C)

ILS frequencies sit in the megahertz range because the navigation signals operate in the VHF/UHF bands. Localizer signals are placed around 108 to 112 MHz, while glide slope signals are around 330 MHz. These frequencies are described in megahertz since they involve millions of cycles per second, and using hertz would yield unwieldy numbers, kilohertz would be far too small, and gigahertz would misrepresent the typical aviation usage. So, megahertz is the appropriate unit.

ILS frequencies sit in the megahertz range because the navigation signals operate in the VHF/UHF bands. Localizer signals are placed around 108 to 112 MHz, while glide slope signals are around 330 MHz. These frequencies are described in megahertz since they involve millions of cycles per second, and using hertz would yield unwieldy numbers, kilohertz would be far too small, and gigahertz would misrepresent the typical aviation usage. So, megahertz is the appropriate unit.