Standard Horizon HX600S User Manual page 7

The FM broadcast band in the United States extends from 88 to 108 MHz. Channels are
assigned at 100 kHz increments; i.e.: 88.1, 88.2, 88.3, ... , 107.9. The channels from 88.1 to
91.9 are reserved for noncommercial educational stations. Outside the United States and
Canada, the boundaries and channel spacing vary. In Japan, the band starts at 76 MHz. In
Western Europe, the band generally runs from 88-108 MHz, but channels can be irregularly
spaced, i.e.: 101.25 MHz.
AIR (Aircraft) Bands
The AM VHF aeronautical communications band lies between 108.000 MHz and 136.975
MHz. This frequency spectrum can be divided into a lower and upper range. The lower
range between 108.000 MHz and 118.000 MHz is primarily used for navigational aids such
as the ILS - Instrument 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 upper 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 broadcasts. Frequencies within the aeronautical band are designated according to
their usage.
Refer to the page 23 for operation.
AIR (Aircraft) BAND FREQUENCY CHART
Frequency Range
108.000 - 117.975 MHz
118.000 - 121.400 MHz
121.500 MHz
121.600 - 122.900 MHz Ground & Apron Control
122.700 - 123.900 MHz UNICOM Frequencies
123.450 MHz
124.000 - 128.800 MHz Arrivals & Departures
128.825 - 132.000 MHz Company Operations
Communications Usage
Navigational Aids
Control Towers
Int'l Distress Frequency
Air to Air / Pilot chit chat
7/39
FCC ID: K6630193X20
IC ID: 511B-30193X20
Operating Manual
Vertex Standard Co., Ltd.