Embraer EMB145 Operation Manual page 2272

NAVIGATION AND
COMMUNICATION
10 - DIMMING BUTTON
− The RMU features an automatic screen brightness adjustment,
within a limited range, to keep the display visibility optimized.
The Dimming Button enables RMU brightness to be controlled
manually through the Frequency Tuning Outer Knob. The
manual dimming control can be disabled by pressing the
Dimming Button again or any Line Select Button.
11 - TRANSPONDER IDENTIFICATION MODE BUTTON
− Selects the Transponder Identification Response Mode. The
ident squawk will stop after 18 seconds.
12 - SQUELCH CONTROL BUTTON
− Causes the COM radio to open its squelch allowing any noise
or signal present in the radio to be heard in the Audio System.
The label SQ is displayed on the top line of the COM window
when the squelch is open. When pressed a second time the
Squelch Control Button closes the squelch.
Page
14
2-18-11
AIRPLANE
OPERATIONS
MANUAL
Code
01
REVISION 31