Subelement K: K – Aircraft— Topic 68: Distance Measuring Equipment
Question 3-68K1
Element 3 (GROL)What is the frequency range of the Distance Measuring Equipment (DME) used to indicate an aircraft’s slant range distance to a selected ground-based navigation station?
Explanation
Distance Measuring Equipment (DME) operates in the Ultra High Frequency (UHF) spectrum, specifically within the L-band. The designated frequency range for DME interrogation and reply signals is 962 MHz to 1213 MHz. This range allows for precise pulse timing measurements necessary to calculate the slant range distance between an aircraft and a ground station.
Option A (108.00 MHz to 117.95 MHz) and B (108.10 MHz to 111.95 MHz) describe portions of the Very High Frequency (VHF) band used for VOR (VHF Omnidirectional Range) and ILS (Instrument Landing System) Localizer frequencies. Option D (329.15 MHz to 335.00 MHz) is the frequency range for the ILS Glide Slope, which is also a UHF system but distinct from DME.
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