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HX600SPage 8
AIR
(
Aircraft
)
BAND FREQUENCY CHART
Frequency Range Communications Usage
108.000 - 117.975 MHz Navigational Aids
118.000 - 121.400 MHz Control Towers
121.500 MHz Int’l Distress Frequency
121.600 - 122.900 MHz Ground & Apron Control
122.700 - 123.900 MHz UNICOM Frequencies
123.450 MHz Air to Air / Pilot chit chat
124.000 - 128.800 MHz Arrivals & Departures
128.825 - 132.000 MHz Company Operations
132.000 - 135.975 MHz Area Control center (Enroute)
136.000 - 136.975 MHz Shared ATC/Company Ops & DataLink
AIR (Aircraft) Bands
The AM VHF aeronautical communications band lies
between 108.000 MHz and 136.975 MHz. This fre-
quency spectrum can be divided into a lower and up-
per range. The lower range between 108.000 MHz and
118.000 MHz is primarily used for navigational aids such as the ILS - Instru-
ment Landing Systems, DME - Distance Measuring Equipment, and VOR’s -
Very High Frequency Omni Range. The lower range offers very little in the way
of voice communications, it does however provide someone with a working
knowledge of Morse code the opportunity to identify various beacons. The up-
per range of the aeronautical band 118.000 MHz to 136.975 MHz is where the
majority of voice communications can be monitored. Communications in the
VHF band are transmitted in AM mode and most if not all compatible receivers
automatically default to this mode. Frequencies within the aeronautical range
are spaced in increments of 25 kHz, as such you will find transmissions at
118.000, 118.025, 118.050 MHz etc.
The frequency(s) you monitor will determine the nature of traffic you will hear.
As previously mentioned frequencies in the lower range of the aeronautical
band are mostly occupied by navigational equipment and transmit non-voice
signals in Morse code. If you select a frequency in the upper range the air is
suddenly filled with conversations between pilots and air traffic controllers,
pilots and their company dispatchers, flight service stations, and ATIS broad-
casts. Frequencies within the aeronautical band are designated according to
their usage.
Refer to page 18 for operation.