Garmin Apollo SL40, User Manual, Page: 16 / 24

System Functions
The SL40 includes a number of System Functions that
give you more information about your communication
equipment. Press and hold the
MON
button for about
three seconds to reach the System Function. Turn the
Large,
outer knob to display the available functions.
Adjustments are made with the
Small
, inner knob.
Software
Version
The Software version is available for reference when
you contact Technical Support.
10
System Functions
SW VER x.xx
Software
Version
RF
Level
Noise
Level
Turn LARGE Knob
MON
Press for about two sec.
Headphone
Level
000
255
Low
Display
Level
00
50
Mic1
Squelch
000
127
Intercom
Level
000
255
Sidetone
Level
000
255
High
Display
Level
00
50
Mic2
Squelch
000
127
Transmit
Mic1+2
Mic1 Only
Mic2 Only