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Flashcards

5. VHF Omnidirectional Range (VOR)

Ella Davies RNAV English 99 cards

Cards in this deck (99)

  1. 1VORVHF Omnidirectional Range
  2. 2how is the VOR different to the ADFthe VOR operates in the VHF Range so is unaffected by errors such as static interference or night effect
  3. 3how many different channels does the VOR operate on160
  4. 4what is the frequency range that the 160 different frequencies occur in108.0 and 117.975 MHZ
  5. 5what is the main principle of the VORbearing by phase comparison
  6. 6what types of modulation are associated with the VORamplitude and frequency modulation
  7. 7what are the two main types of VOR transmittersdoppler VOR
    conventional VOR
  8. 8TVORTerminal VOR
  9. 9what is a TVORlow powered short range VOR
  10. 10what are the three different types of VOR signals-enroute vor
    - terminal VOR
    - test VOR
  11. 11VOTTest VOR
  12. 12What is the frequency bands allocated to the TVOR and ILS108.0 - 111.975 MHz
  13. 13how can you tell if it is an TVOR or ILS in the range between 108.0 - 111.975 Mhzif the first decimal is even - TVOR
    if the first decimal is odd - ILS
  14. 14what is the frequency range for the En-route VOR112.0-117.975 MHZ
  15. 15what does 30VAR meanVariable signal at 30 hz
  16. 16describe the 30VAR radiation pattern of a CVORa limacon rotating clockwise at 1800 rpm creates an amplitude modulation at 30 hz in a given direction
  17. 17what is the typical spacing between the VOR Channels50 khz
  18. 18How many ILS channels are there40
  19. 19how many TVOR channels are there40
  20. 20what the typical spacing of the En-route VOR channels50 khz
  21. 21how many en-route VOR channels are there120 channels
  22. 22what does the CVOR signal transmitted consist ofa reference signal
    a variable signal
  23. 23how can the reference phase be describedomni-directional
  24. 24how is the reference phase transmittedon a subcarrier of the main VHF carrier wave
  25. 25how is the reference phase on the subcarrier modulated in CVORFrequency modulated at 30 hz rate
  26. 26how is the directional variphase signal transmittedon the main VHF carrier, rotating 1800 RPM, 30 hz, giving the appearance of amplitude modualtion
  27. 27what can be said about the reference signal if at an equidistance rangethe phase of the transmitted wave would be equal on all bearings from the ground beacon
  28. 28what can be seen from the rotating variphase signalthe phase will be different at different bearings, giving the appearance of changes in amplitude, hence appears to be amplitude modulated
  29. 29at a bearing of 0˚ what is the phase difference000˚
  30. 30at a bearing of 90˚ what is the phase difference of the reference phase and variphase090˚
  31. 31what is the phase difference between the reference phase and the variphase at a bearing of 180˚180˚
  32. 32the name given to the emitting radio wave from the VOR is called..A Radial
  33. 33in what direction does the transmitter send out a radialin all directions
  34. 34what inaccuracy is CVOR subject tosite error
  35. 35DVORDoppler VOR
  36. 36why are doppler VORs usedto overcome the problem of site error
  37. 37how do doppler VORs stop the site error that is common in CVORreversing the roles of the AM and FM components and using a bigger aerial
  38. 38in DVOR what component is the reference signalamplitude modulated
  39. 39why is the reference signal amplitude modulated in a DVORas it is required to be the same on all bearings
  40. 40in a DVOR what component is the vari-phase signalthe frequency modulated signal
  41. 41how is the phase difference on different bearings achieved using a DVORthe doppler technique is applied
  42. 42in DVOR what signal is on the sub-carrierthe vari-phase signal
  43. 43how is the vari-phase signal transmittedin turn by each one of the 50 aerials sited in a circular pattern around the central aerial transmitting the AM reference signal
  44. 44how does the doppler shift occur in DVORbecause the distance between the point of transmission and the aircraft receiver is increasing and decreasing as the aerials are switched
  45. 45at what frequency does the doppler shift seem to be occurring in a DVOR30 Hertz
  46. 46what does the airborne VOR equipment consist of?receiver
    control unit
    aerial
    indicator
  47. 47what are the three different indicators that supply VOR bearing informationCDI
    RMI
    HSI
  48. 48CDIcourse deviation indicator
  49. 49RMIradio magnetic indicator
  50. 50HSIHorizontal situation Indicator
  51. 51what should be set on the OBS control of a CDI knob when heading to the VORthe reciprocal
  52. 52what should be set on the OBS control knob of a CDI when flying from the VORthe radial
  53. 53what is important to remember about the to / from indicatorit is independent of heading
  54. 54what does the L/R deviation indicator showangular displacement of an ac from the OBS course
  55. 55when will an off flag appear on the indicator- failure of the aircrafts receiver
    - failure of the VOR transmitter
    - failure of the indicator
    - received signals are too weak or the aircraft is out of range
  56. 56what is the deviation scale on an OBI2˚ per dot
  57. 57what are the steps in obtaining a VOR-switch on
    - check it is in the DOC of the VOR
    - set frequency
    - check ident
    - check no off flag
    - turn the OBS to centralise the needle
  58. 58with an OBI with FROM shown, what is displayedthe magnetic RADIAL
  59. 59with an OBI with TO shown, what is displayedthe magnetic TRACK
  60. 60define IDENT3 letter morse code group (1020 hz AM) transmitted from a VOR once every ten seconds
    may also carry an ATIS broadcaast
  61. 61how is a VOR monitoredtransmissions from VOR stations are monitored for accuracy and signal strength
  62. 62what mishaps cause action to be taken by the monitoring system in the VOR monitor- a change in bearing greater than 1˚
    - a reduction in signal strength of more than 15%
    - failure of the monitor itself
  63. 63what will the monitor do if any errors are detectedremove the IDENT and navigation components from the transmission or switch of the radiation altogether
  64. 64what can you say about the FM and AM componentsthey are phase locked, meaning any equipment in the aircraft should only receive a 000˚ or 180˚ bearing when receiving a test signal
  65. 65when will you receive a 000˚ bearing from a test VORin the FROM sector
  66. 66when will you receive a 180˚ bearing from a test VORwhen in the TO sector
  67. 67what should the accuracy of the TVOR bearing be within±4˚
  68. 68what is the area above the VOR where no signal will be received called?the cone of confusion
  69. 69what are the four indications of station passage-L/R needle swings from side to side
    - OFF flag displays temporarily (many VOR receivers have delay to combat this)
    - TO may show TO/FROM before switching to FROM
    - RMI needle fluctuates then rotates
  70. 70what are the main factors affecting the VOR range (4)transmitting power
    line of sight
    DOC
    nature of terrain
  71. 71DOCDesignated Operational coverage
  72. 72what is range proportional to√power
  73. 73what is the approximate power outage and range of an en-route VOR200 watts
    200 nm
  74. 74what is the approximate power outage and range of an terminal VOR50 Watts
    100 nm
  75. 75what is the maximum range for a VOR300 nm
  76. 76what is the formula for the line of sightrange (nm) = 1.23 (√h1 + √h2)
  77. 77define the issue of DOCsame frequency may be allocated to two VORs in a given region and lead to mutual interference
  78. 78what can DOC interference result in- garbled identification
    - bearing or range errors
    - inability to require a navigation signal
    - acquiring the wrong signal
  79. 79why can the nature of terrain affect the range of a VORbecause it can cause site and propagation errors
  80. 80what factors affect VOR accuracysite error
    propagation errors
    airborne equipment errors
    interference errors
  81. 81what two oscillation movements are associated with propagation errorsscalloping
    bends
  82. 82define bendsslow oscillations of the VOR indication needle
  83. 83define scallopingfast oscillations of the VOR indication needle
  84. 84what is the overall accuracy of a VOR± 5 ˚
  85. 85if magnetic bearing needs to be converted to true, which variation is used for ADFVariation at aircraft position
  86. 86if magnetic bearing needs to be converted to true, which variation is used for VORvariation at ground beacon position
  87. 87from which equipment does the RMI display information fromthe ADF and the VOR
  88. 88what rotates on the RMIthe compass card
  89. 89what is the orientation of the pointers determined by on a RMIThe relative bearing
  90. 90what is read by the pointer on a RMIthe QDM if variation is the same
  91. 91what does the tail of a pointer read on an RMIQDR always
  92. 92what is the HSIan alternative indicator displaying VOR deviation information
  93. 93what part of a HSI rotatesthe inner CDI card
  94. 94CDIcourse deviation indicator
  95. 95what is the influence of a heading on the OBInothing
  96. 96regarding VOR what variation is used to convert a QDR to a QTEvariation at the VOR position
  97. 97in what direction does the Limacon rotatealways clockwise
  98. 98how many different types of modulation are there5
  99. 99what are the five different types of modulationIDENT
    ATIS
    FM
    AM
    AM at subcarrier

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RNAV Flashcards on 5. VHF Omnidirectional Range (VOR), created by Ella Davies on 17/03/2018.
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Ella Davies
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