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What must be considered when requesting a bearing or heading from a VHF direction-finding station whilst operating at low altitude in the vicinity of high terrain?

Multipath reception may..

  • A
    Cause errors in the VHF voice transmissions to the aircraft.
  • B
    Cause errors in the bearings displayed at the aircraft station.
  • C
    Limit the line of sight range.
  • D

    Cause errors in the bearings displayed at the direction&finding station.

MULTIPATH EFFECT

Multipath propagation phenomenon results in radio signals reaching the receiving antenna by two or more paths. Multipath effects can cause problems in direction-finding due to the nature of VHF signals. When there is a high ground or other orographic irregularities, a transmitted signal can be reflected from objects. Since VDF bearing is detected at the ground station, reflected signals may cause errors in the bearings displayed at the direction finding station (not "at the aircraft station").

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