DME provides distance information to a VOR or VOR/DME station and uses which type of frequencies?

DME provides distance information to a VOR or VOR/DME station and uses which type of frequencies?

• A. VHF frequencies
• B. VHF and UHF combined
• C. UHF frequencies
• D. HF frequencies

Answer: (C)

DME distance information relies on a two-way exchange that happens in the UHF band. The aircraft’s DME interrogator sends a pulse to the ground-based DME transponder, which replies on a paired UHF channel. By measuring the time between the interrogations and replies, the system calculates the distance to the station. While VOR signals themselves are in VHF, DME uses UHF frequencies (roughly 962 to 1213 MHz) to enable fast, precise two-way timing with minimal interference. That’s why the correct choice is UHF frequencies.

DME distance information relies on a two-way exchange that happens in the UHF band. The aircraft’s DME interrogator sends a pulse to the ground-based DME transponder, which replies on a paired UHF channel. By measuring the time between the interrogations and replies, the system calculates the distance to the station. While VOR signals themselves are in VHF, DME uses UHF frequencies (roughly 962 to 1213 MHz) to enable fast, precise two-way timing with minimal interference. That’s why the correct choice is UHF frequencies.