DME

Airborne DME equipment is able to discriminate between pulses intended for itself and pulses intended for other aircraft because : Aircraft transmit and receive on different frequencies. Aircraft will only accept unique twin pulses. Aircraft reject pulses not synchronized with its own random pulse recurrence rate. Each aircraft has its own frequency.

A DME beacon having a transmit frequency of 962 MHZ would have a receive frequency of : 1030 MHZ. 902 MHZ. 1025 MHZ. 962 MHZ.

A VOR/DME share the same first two letters of their respective identifiers; the last identifying letter of the DME is a Z. This means that : They are co-located. They are more than 600m apart but serve the same location. They are widely separated and do not serve the location. They are a maximum distance of 30m apart.

The distance measuring equipment is an example of ____ radar operating on a frequency of ____ in the ____ band. primary 8800 mhz SHF. secondary 1030 mhz UHF. secondary 962 mhz UHF. primary 9375 mhz SHF.

A DME transponder does not respond to pulses received from radars other than DME because : each aircraft transmits pulses at a random rate. DME transmits and receives on different frequencies. It will only accet the unique twin DME pulses. DME only responds to the strongest 100 interrogators.

The range indicated by DME is considered to be accurate to within : 3% range. 1.25 % range. 0.5 nm. +/- 0.25nm +/- 1.25% of range.

A DME receiver is able to distinguish between replies to its own interrogations and replies to other aircraft because : DME is secondary radar and each aircraft transmits and receives on a different frequency. DME transponders reply to interrogations with twin pulses and the airborne equipment ejects all other pulses. Each aircraft transmits pulses at a random rate and will only accept synchronzied replies. When DME is in the search mode it will only accept pulses giving the correct range.

When a DME transponder becomes saturated : It reverts to standby. It increases the number of pulse pairs to meet the demand. It increases the receiver threshold to remove weaker signals. It goes into a selective response mode of operation.

An aircraft flying at FL250 wishes to interrogate a DME beacon situated 400ft AMSL. What is the maximum range likely to be achieved?. 210 nm. 198 nm. 175 nm. 222 nm.

For a DME and a VOR to be said to be associated it is necessary for : The DME to transmit on the same VHF frequency. The aerial separation not to exceed 100 feet in a TMA or 2000 feet outside a TMA. The aerial separation not to exceed 100 metres in a TMA or 2000 M outside a TMA. Both beacons to have the same first two letters for their ident but the last letter of the DME to be a Z.

The transmission frequency of a DME beacon is 63 MHZ removed from the aircraft interrogator frequency to prevent : interference from other radars. the airborne receiver locking on to primary returns from its own transmissions. static interference. receiver accepting replies intended for other interrogators.

The accuracy associated with DME is : + or - 3% of range, or 0.5nm, whichever is greater. + or - 1.25% of range. + or - 3% of range. +/-0.25 nm +/-1.25% of range.

For a VOR and a DME beacon to be said to be associated the aerial separation must not exceed _____ in a terminal area and ____ outside a terminal area. 100m 2000m. 50 feet 200 feet. 30m 600m. 50m 200m.

DME is a ____ radar operating in the ____ band and uses ____ in order to obtain range information. The correct words to complete the statement above are : Primary SHF CW signals. Secondary UHF twin pulses. Secondary SHF "jittered pulses". Primary UHF pulse pairs.

The receiver of airborne DME equipment is able to "lock on" to its own "reply pulses" because : each aircraft has its own unique transmitter frequency and the receiver only accepts reply pulses having this frequency. the reply pulses from the ground transmitter have the same frequency as the incoming interrogation pulses from the aircraft. the aircraft receiver only accepts reply pulses which have the same time interval between successive pulses as the pulses being transmitted by its own transmitter. the aircraft receiver only accepts reply pulses which arrive at a constant time interval.

The VOR in an aircraft is correctly tuned and set to define the centre line of an airway within UK airspace which you intend to fly. The indication received on the VOR/ILS deviation indicator is shown in the diagram alongside : 042 radial. 048 radial. 228 radial. 222 radial.

The VOR in an aircraft is correctly tuned and set to define the centre line of an airway within UK airspace which you intend to fly. The indication received on the VOR/ILS deviation indicator is shown in the diagram alongside : left onto 045. right onto 048. left onto 225. right onto 225.

DME operates in the frequency band, it transmits which give it the emission designator of. SHF double size pulses PO1. UHF twin pulses PON. EHF twin pulses A9F. UHF double pulses J3E.

Referring to DME during the initial stage of the "search" pattern before "lock on" : the airborne receiver checks 150 pulses each second. the airborne transmitter transmits 150 pulses each second. the ground receiver maintains the ground transmitter pulse transmission rate at no more than 150 per second. the aircraft transmits 24 pulses per second and the receiver checks a maximum of 150 pulses per second.

DME and VOR are "frequency paired" because : the same receiver can be used for both aids. the VOR transmitter is easily converted to the required DME frequency. cockpit workload is reduced. both ground transmitter aerials can be placed on the same site if required.

A DME receiver is able to distinguish between replies to its own interrogation pulses and those intended for other aircraft using the same transponder because : DME is a secondary radar and each aircraft transmits and receives on a different frequency. DME transponders reply to interrogations by means of twin pulses and the airborne equipment rejects all single pulses. each aircraft transmits pulses at a random rate ("jittering") and will only accept replies that match this randomization. when DME is in the range search mode it will accept only pulses separated by + or - 63 mhz from the interrogation frequency.