AUTOMATIC DIRECTION FINDER (ADF) Flashcards

1
Q
  1. The phenomenon of coastal refraction which affects the accuracy of ADF bearings:
A

can be minimised by taking bearings where the signal crosses the coastline at right angles

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2
Q
  1. An aircraft is intending to track from NDB ‘A’ to NDB ‘B’ on a track of 050° (T), heading 060° (T). If the RBI shows the relative bearing of ‘A’ to be 180° and the relative bearing of ‘B’ to be 330° then the aircraft is:
A

starboard of track and nearer ‘B’

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3
Q
  1. ADF Quadrantal Error is caused by:
A

the aircraft’s major electrical axis, the fuselage, reflecting and re-radiating the incoming
NDB transmissions

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4
Q
  1. The overall accuracy of ADF bearings by day within the Promulgated Range (DOC) is:
A

±5°

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5
Q
  1. In order to Tune, Identify and Monitor N0N A1A NDB emissions the BFO should be used as follows:
A

Tune ON
Identify ON
Monitor ON

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6
Q
  1. The magnitude of the error in position lines derived from ADF bearings that are affected by coastal refraction may be reduced by:
A

choosing beacons on or near the coast

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7
Q
  1. The BFO facility on ADF equipment should be used as follows when an NDB having N0N A1A type emission is to be used:
A

BFO should be switched on for tuning, ident and monitoring

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8
Q
  1. The Protection Ratio of 3:1 that is provided within the Promulgated range/Designated Operational Coverage of an NDB by day cannot be guaranteed at night because of:
A

long range skywave interference from other transmitters

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9
Q
  1. Each NDB has a range promulgated in the COMM section of the Air Pilot. Within this range interference from other NDBs should not cause bearing errors in excess of:
A

day ± 5°

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10
Q
  1. In order to resolve the 180° directional ambiguity of a directional LOOP aerial its polar diagram is combined with that of a SENSE aerial ………………………….. to produce a ………….. whose single null ensures the ADF needle moves the shortest distance to indicate the correct……………
A

at the aircraft, cardioid, bearing

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11
Q
  1. The phenomena of coastal refraction affecting ADF bearings is caused by the signal …………… when it reaches the coastline and bending ……………. the normal to the coast:
A

accelerating / away from

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12
Q
  1. In an ADF system, night effect is most pronounced:
A

at dusk and dawn

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13
Q
  1. When the induced signals from the loop and the sense antenna are combined in an ADF receiver, the resultant polar diagram is:
A

a cardioid

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14
Q
  1. When flying over the sea and using an inland NDB to fix position with a series of position lines, the plotted position in relation to the aircraft’s actual position will be:
A

closer to the coast

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15
Q
  1. An aircraft on a heading of 235°(M) shows an RMI reading of 090° with respect to an NDB. Any quadrantal error which is affecting the accuracy of this bearing is likely to be:
A

a maximum value

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16
Q
  1. The principal propagation path employed in an NDB/ADF system is:
A

surface wave

17
Q
  1. The ADF of an aircraft on a heading of 189°(T) will experience the greatest effect due to Quadrantal Error if the NDB bears:
A

234°(T)