Oxford, Air Navigation
Distance Measuring Equipment: DGCA Air Navigation questions
Distance measuring equipment, or DME, gives range from a ground beacon. The aircraft sends pulse pairs, the beacon replies 63 MHz away after a fixed delay, and the airborne set times the round trip in the UHF band.
The 12 questions mix definitions and short workings: radar type and band, the frequency split, beacon saturation, VOR and DME pairing, accuracy and line of sight range. 1 of them featured in DGCA exam sessions.
DME measures slant range, so overhead the beacon it reads your height in nautical miles, not zero. For line of sight range, take 1.23 times the square root of each height in feet, aircraft and beacon, then add the two.
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Question 1 of 5
A DME beacon having a transmit frequency of 962 MHz would have a receive frequency of:
Question 2 of 5
Distance Measuring Equipment (DME) is an example of ______ radar operating on a frequency of ______ in the ______ band.
Question 3 of 5
A DME transponder does not respond to pulses received from radars other than DME because:
Question 4 of 5
When a DME transponder becomes saturated:
Question 5 of 5
An aircraft flying at FL250 wishes to interrogate a DME beacon situated 400 ft AMSL. What is the maximum range likely to be achieved?
7 more questions in this chapter
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