Explanation: The typical DME ground based responder beacon has a limit of 2700 interrogations per second. It refers to pulse pairs per second, called pps.

Explanation: The physical distance between the aircraft antenna and the DME transponder antenna is referred to as slant range. It is measured using the DME.

Explanation: False, the spacing of all channels is 1 MHz. Further, it has a signal spectrum width of 100 kHz. There are 126 channels each, for interrogation and reply.

Explanation: 1025 MHz to 1150 MHz are the frequencies are used by an airplane’s DME interrogator. DME frequencies are paired to VHF omnidirectional range frequencies.

Explanation: 962 MHz to 1213 MHz is the range of frequency for the transmitting channel of DME transponders. The range frequency for the receiving channel is between 1025 and 1150 MHz.

Explanation: The difference between a pair of interrogation and reply frequencies is of the magnitude of 63 MHz. Also the band comprises of 126 channels solely for interrogation purpose and another 126 channels for reply purposes.

Explanation: The DME use a 1,350 Hz Morse code in order to identify themselves. This code is in the form of a three letter identity, which when collated with either a VOR or ILS system, will have a similar identity code.

Explanation: Terminal transponders generally work to a minimum height above ground of 12,000 feet. These transponders are usually installed in airport buildings. Such transponders often have a short range and are unable to work in extreme weather conditions.

Explanation: The range of high altitude transponders is 130 nautical miles. They typically provide service to a minimum height of 45,000 feet. These devices are based on wireless communication and can operate in extreme conditions.

Explanation: A total of 252 frequencies are defined for DME interrogations and replies. However, all of them are not used. The frequencies are the same for X and Y channels.

Explanation: True, the X channels have both interrogation and reply pulse pairs spaced by 12 microseconds. This separation is not the same for Y channels.

Explanation: The Y channels interrogation pulse pairs are spaced by 36 microseconds. However, the Y channel reply pulse pairs are spaced by 30 microseconds.