The Distance Measuring Equipment (DME) ground station has a built-in delay between reception of an interrogation and transmission of the reply to allow:

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Multiple Choice

The Distance Measuring Equipment (DME) ground station has a built-in delay between reception of an interrogation and transmission of the reply to allow:

DME measures distance from the time it takes for an interrogation to travel to the ground station and for the corresponding reply to come back. The ground station inserts a fixed delay between receiving the interrogation and transmitting the reply to create a predictable timing window. That timing must be preserved even when the aircraft is very close, so the reply arrives in a time frame that the aircraft’s receiver can correctly process without confusion or overlap with other signals. In short, the delay makes reliable operation possible at close range by ensuring proper timing separation. The other options don’t relate to how DME timing works.

DME measures distance from the time it takes for an interrogation to travel to the ground station and for the corresponding reply to come back. The ground station inserts a fixed delay between receiving the interrogation and transmitting the reply to create a predictable timing window. That timing must be preserved even when the aircraft is very close, so the reply arrives in a time frame that the aircraft’s receiver can correctly process without confusion or overlap with other signals. In short, the delay makes reliable operation possible at close range by ensuring proper timing separation. The other options don’t relate to how DME timing works.

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