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Flashcards

11. DME

Ella Davies RNAV English 63 cards

Cards in this deck (63)

  1. 1what is the basic principle of the DMEtime measurement between an interrogation and a reply (secondary system)
  2. 2how do on board DMEs interrogate the ground beaconby sending pairs of pulses with a random interval between each set of pairs
  3. 3what is this known asjittering
  4. 4why do we use jittered pulsesto differentiate answers to each aircraft as the ground beacon answered to exact same jittered pulses pattern
  5. 5what is the reply delay of the ground beacon50 micro seconds
  6. 6what is the frequency shift between the interrogation and the reply63 MHz
  7. 7why do we have this frequency shiftto combat multipath errors
  8. 8what are the DME modessearch mode
    tracking mode
    memory mode
  9. 9when is the search mode usedwhen it is first selected
  10. 10when do you use tracking modewhen it is in use
  11. 11when do you use memory modewhen the signal is lost
  12. 12what is the interrogation rate associated with the search modefast up to 150 pps
  13. 13when will the search mode switchuntil the reception of a DME reply or 15'000 pairs of pulses
  14. 14what is the mode that the DME goes into if lock on is not achievedreduced search mode
  15. 15what is the new rate of interrogation when in reduced search mode60 pps
  16. 16describe tracking modewhen lock on is achieved, interrogation rate decreases to around 24-30 pps
  17. 17describe the memory modedisplay of the distance is based on the last rate of change during 10 s
  18. 18what is ground beacon saturationground beacon is designed to transmit a max 2700 pps
  19. 19how many aircraft can the ground beacon transmit to when in ground beacon saturationapprox 100 aircraft
  20. 20what is the band of frequency of the DME960 - 1215 Mhz
  21. 21how many channels are associated with the band frequency of the DME126 X channels
    127 Y channels
  22. 22how many pulse pair spacing is associated with the X channel12 micro seconds
  23. 23how many pulse pair spacing is associated with the Y channel36 micro seconds
  24. 24when will a DME and en-route VOR be co-locatedless than 600 m (2000 ft)
  25. 25when will a DME and Terminal VOR be co-locatedless than 30 m (100 ft)
  26. 26describe the DME ident when they are co located1 every 30 seconds
  27. 27describe a DME ident when they are isolated1 every 40 seconds
  28. 28what frequency is the ident transmitted on1350 Hz
  29. 29what are DME squitterstransmission from the ground beacon to "wake up" on board DME on auto-standby
  30. 30what is a TACANa military VOR/DME
  31. 31what part of a TACAN can be used by civiliansonly the DME part
  32. 32what is VOR/DME pairingautomatic association VOR frequency and DME channel pairing
  33. 33what distance from the AC is measuredthe slant range of the AC
  34. 34when is the GS read out correctwhen the AC is flying directly to or from the DME
  35. 35what is a DME position linea circle with a ground beacon at its centre
  36. 36when can we consider the slant range as a ground distancewhen the slant range is more than 3 times the height of the aircraft
  37. 37what is the DME accuracy of the beacons pre 19890.25 +/- 1.25% nm
  38. 38what is the DME accuracy of the beacons post 19890.2 nm
  39. 39what is the beacon saturation in search mode18
  40. 40what is the beacon saturation in reduced search mode45
  41. 41what is the beacon saturation in tracking mode120
  42. 42how long will the radio be in memory mode forapproximately 10 seconds, then if no reply will go back to search mode
  43. 43DMEDistance Measuring Equiptment
  44. 44what does the AC do in the DME systemInterrogates
  45. 45what frequency band is usedUHF band
  46. 46what can you say about the distance between each pulse in a pairit is always constant
  47. 47what can you say about the distance between two pulse pairsit changes
  48. 48what is the delay between receiving and replying50 micro seconds
  49. 49why is the pause 50 micro secondsto receive and prepare answer is less than 50 micro seconds so ensures it can be very accurate and always sent after 50 micro seconds
  50. 50what is the max rangeapproximately 200 nm
  51. 51what is the equation for rangerange (nm) = (time-delay) / 12.36
  52. 52which interrogations does the DME answerthey answer the strongest interrogation
  53. 53what can you say about the setting of DME channelsyou don't set DME channels they are set automatically, as VOR and ILS frequencies have associated DME frequencies
  54. 54what happens to the ident when the DME and VOR are not co-located but are serving the same area (UNDER 6NM APART)you will have a Z ADDED to the end of the ident
  55. 55what happens when the ILS and VOR are more than 6 nm apartdifferent call sign and are not paired
  56. 56how can the ground beacon ensure that the signals from the closer AC take priorityby reducing the ground receiver gain
  57. 57what does the ground beacon do if there are no AC in the areasquitters
  58. 58what is the RDMIradio distance magnetic indicator
  59. 59what displays the GSVHF nav control panel
  60. 60when do you have the most errorwhen you are directly above the ground beacon
  61. 61what can be said about the GS displayed compared to actual GSthe GS displayed is always less than the actual ground speed
  62. 62what is one of the main limitations of the DMEline of sight
  63. 63what is one of the advantages of the DMEmore accurate than the VOR or ADF

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Description
RNAV Flashcards on 11. DME, created by Ella Davies on 16/05/2018.
Created by
Ella Davies · May 2018
Updated
May 16, 2018
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