4.1RADIO STATUS INDICATIONS

•RX – When a COM signal is received, a white ‘RX’ appearsby the active COM frequency duringsignal reception.

•TX–WhenaCOMradioistransmitting,awhite‘TX’ indicationappearstotherightofthecorresponding COM frequency.

•ID – When the Morse code identifier is ON for a NAV radio, a white ‘ID’ indication appears to the left of the corresponding active NAV frequency. The Morse code identifier can be heard if the corresponding NAV radio is selected on the audio panel.

Figure 4-5 Radio Status Indications

SECTION 4 – NAV/COM &

TRANSPONDER

Squelch

Indication

Figure 4-7 Squelch Indication

4.4QUICKLY ACTIVATING 121.500 MHZ

Pressing and holding the COM Frequency Transfer Keyforapproximatelytwo(2)secondsautomaticallytunes the selected COM radio to the emergency frequency.

4.5OPTIONAL NAV RADIOS

DME Radio (optional)

The DME Tuning Window is displayed by pressing the

DME Softkey.

4.2VOLUME

‘VOLUME’ is displayed in place of the associated radio name (i.e., ‘COM1’ or ‘NAV2’) for two seconds after the volumelevelislastchanged. Thepercentageofmaximum volume is displayed in place of the standby frequency selected by the tuning box.

Figure 4-6 COM Volume Level

4.3AUTOMATIC SQUELCH

Automatic squelch can be disabled for a COM radio by pressing the COM Knob to place the tuning box on the desired COM’s standby frequency, then by pressing the

VOL/PUSH SQ Knob.

When Automatic Squelch is disabled, a white ‘SQ’ appears next to the COM frequency.

Figure 4-8 Radio Tuning Window

Changing the DME tuning source:

1)From the tuning window, turn the large FMS Knob to highlight the DME source field.

2)Turn the small FMS Knob to display the selection window. Turn the FMS Knob to select the desired mode and press the ENT Key.

Figure 4-9 DME Selection Window