Standard Horizon HX600S, Руководство пользователя

Страница: 10 / 56

HX600S Page 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
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 bea-
cons. The upper range of the aeronautical band 118.000 MHz to 136.975
MHz is where the majority of voice communications can be monitored. Com-
munications 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.