ABSTRACT
VOR is a short/medium-range navigation system
operating in the 108-117.95 MHz range of
frequencies. This means that the radio waves are
now propagated as space waves. The problems
that were encountered with ground and sky waves
in the LF and MF ranges are no longer present
with a VHF system. VOR navigation aids are
identified by unique three-letter codes (derived
from their name, e.g. London VOR is called
LON, Dover VOR is called DVR etc.). The code
is modulated onto the carrier wave as a 1020 Hz
tone that the crew can listen to as a Morse code
signal. Some VOR navigation aids have an
automatic voice identification announcement that
provides the name of the station; this alternates
with the Morse code signal. The location of the
VOR navigation aids (specified by latitude and
longitude) together with their carrier wave
frequencies is provided on navigation charts as
with ADF.
