IFD400 Series Pilot Guide
1-18 System Overview
COM-NAV †
The VHF system consists of a communications transceiver that
covers the frequency band from 118.0 MHz to 136.990 MHz and
a navigation receiver that covers the frequency band from 108.0
MHz to 117.95 MHz. Both 25 kHz and 8.33 kHz spacing are
supported. The IFD comes standard with a 10 watt transmitter,
with an option to upgrade to a 16 watt transmitter.
Display
The active com frequency is the frequency that the radio will
transmit on when the Push-To-Talk button is pressed. The
standby frequency is the frequency that will become the active
com frequency when the bezel Frequency Swap button is
pressed. The active com frequency is displayed in green and the
standby frequency is displayed in white.
COOL FEATURE
Decoded Facility Identifier
The facility (e.g. Ground, Tower, Approach) for the
Active and Standby com frequencies are displayed
in each com frequency slot. This is a handy
reminder of the facility that is tuned in each slot.
Similarly, if the frequency displayed is a navigation
frequency, then the identifier decoded from Morse
code will be displayed, which serves as a means to
Tune-Identify-Monitor.
If a slot is receiving a voice transmission, a “RX” indication will be
displayed along the right edge of the given communications slot.
When the active frequency is transmitting, a “TX” indication will
be displayed along the right edge of the Active com slot.
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