dme frequencies are paired to vhf omnidirectional range (vor) frequencies and a dme interrogator is designed to automatically tune to the corresponding dme frequency when the associated vor frequency is selected. an airplane's dme interrogator uses frequencies from 1025 to 1150 mhz. dme transponders transmit on a channel in the 962 to 1213 mhz range and receive on a corresponding channel between 1025 and 1150 mhz.