3-2
GTN 625/635/650 Pilot’s Guide
190-01004-03 Rev. P
Foreword
Getting
Started
Audio &
Xpdr Ctrl
Com/Nav
FPL
Direct-To
Proc
Wpt Info
Map
Traffic
Terrain
Weather
Nearest
Services/
Music
Utilities
System
Messages
Symbols
Appendix
Index
3.1 Volume
Com radio volume is adjusted using the Volume knob. Turn the Volume
knob clockwise to increase volume, or counterclockwise to decrease volume.
The level will be maintained until changed.
1. Turn the Volume knob to set the Com volume.
Percent of
Maximum Volume
Graphic Scale Showing Volume
Figure 3-3 Com Volume Setting
2. A bar graph showing the relative volume level will indicate the
selected level and will disappear a few seconds after releasing
the Volume knob.
3.2 Squelch
The Com radio features an automatic squelch to reject many localized noise
sources. You may override the squelch function by pressing the Volume knob.
This facilitates listening to a distant station or setting the desired volume level.
To override the automatic squelch, press the Volume knob momentarily.
Press the Volume knob again to return to automatic squelch operation. A “SQ”
indication appears above the active Com frequency window in the upper left
corner of the display when automatic squelch is overridden.
Turn to Select MHz
Turn to Select kHz
Active Com Frequency
(Touch to Flip/Flop)
Standby Com
Frequency
Com Control Text
Com Volume and
Squelch Control
Squelch Annunciation
Receive Annunciation
Figure 3-4 Com Controls
While receiving a transmission, an “RX” indication appears in the
Com
frequency
window to the immediate right of “
Com.
” A “TX” indication appears
at this location while you are transmitting.
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