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Which statement about the range of VHF waves is correct ?
  • A
    It depends on the altitude of the aircraft and the elevation of the ground antenna.
  • B
    It does not depend on the elevation of the antenna of the transmitter.
  • C
    It does not depend on the altitude of the aircraft but only on the power of the transmitter.
  • D
    Obstacles like mountains between transmitter and aircraft do not affect the range.

Max range at which you will receive a signal/indication of a VOR station will depend on trasmitter power, altitude, receiver sensitivity, atmospheric conditions and various other intangible factors.

The range and altitude within which a reliable signal will be received is defined by the Deisignated Operational Coverage (DOC) as published for the specific VOR (they vary depending on what the aid is there for).

The max theoretical range in nautical miles was always worked out thus:

R = 1.23 (√ H1 + √ H2)

Where:

H1 = Altitude/ Height of the reciver in ft
H2 = Elevation of the ground facility in ft

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