Monitoring
a
Comm
Frequency
The
Comm
Frequency
Monitoring
function
allows
you
to
monitor
the
S
tandby
Comm
frequency
for
activity
,
while
listening
to
the
Active
frequency
.
Press
the
COM
key
while
in
the
Comm
function
to
listen
to
the
S
tandby
frequency
.
A
small
“m”
will
replace
the
“s”
in
front
of
the
S
tandby
frequency
.
Press
the
COM
key
a
second
time
to
exit.
Note
that
changing
modes
(NA
V,
SYS,
etc.)
will
not
disable
the
Comm
frequency
monitoring.
Monitoring
a
Nav
Frequency
The
Nav
radio
provides
a
monitor
function
for
VORs
in
the
S
tandby
channel
similar
to
the
Comm
radio.
The
monitor
function
is
activated
or
deactivated
by
pressing
the
NA
V
button
while
in
the
Nav
function.
The
From
radial
for
the
S
tandby
channel
is
shown
in
p
arentheses
when
the
VOR
monitor
mode
is
activated.
This
replaces
the
st
ation
identifier
,
OBS
course,
or
VOR/LOC
indicator
.
The
S
tandby
VOR
radial
is
updated
once
per
second.
Y
o
u
cannot
monitor
a
Localizer
channel
and
the
Nav
audio
is
temporarily
disabled
while
the
system
is
monitoring
the
S
tandby
VOR.
If
no
signal
can
be
tracked
on
the
S
tandby
channel,
then
it
will
be
dashed
out.
The
VOR
Monitor
function
is
turned
of
f
when
you
flip/flop
frequencies,
recall
a
frequency
,
o
r
press
NA
V
again.
Monitoring
is
not
canceled
by
switching
to
Comm.
A
small
“m”
will
replace
the
“s”
in
front
of
the
S
tandby
frequency
.
The
audio
for
the
active
Nav
channel
is
toggled
between
modes
using
the
ID
button.
The
annunciator
above
the
button
will
light
while
the
Nav
audio
is
activated,
and
the
detected
audio
signal
will
be
sent
to
the
Nav
audio
output
circuit.
Nav
audio
may
also
be
mixed
with
the
Comm
audio
output,
if
selected
in
the
System
mode.
This
feature
is
used
for
inst
allations
that
do
not
use
an
external
audio
p
anel.
When
you
are
monitoring
a
VOR,
Nav
audio
is
suspended.
There
are
three
modes
for
the
Nav
audio
(Ident
code,
voice
Ident,
no
Ident).
Press
the
ID
button
to
st
art
the
ID
mode.
“IDENT”
will
be
displayed
for
three
seconds.
The
Morse
code
tones
sent
over
the
VOR/Localizer
channels
will
be
heard.
If
the
ID
button
is
pressed
a
second
time.
“VOICE”
will
be
displayed
for
three
seconds.
The
Morse
code
tone
volume
will
be
reduced
so
you
can
hear
the
voice
transmission
more
clearly
.
Press
ID
again
to
turn
the
audio
and
ID
annunciator
of
f.
The
last
audio
output
selection
is
kept
in
memory
until
you
change
it,
even
when
the
SL30
is
powered
of
f.
Using
this
feature,
you
may
leave
the
audio
enabled
and
then
control
it
by
an
external
audio
p
anel.
Listening
to
the
Audio
Channel
010º
Radial
0
9
27
18
3
6
12
15
21
24
33
30
030º
Radial
FA
F
MAP
VOR
ABC
1
16.00
XYZ
ILS
1
1
1.10
111.10
m116.00
(010)
bc
+
}}
Graphic
CDI
Fly
right
Active
Channel
ILS
XYZ
S
tandby
Channel
Monitors
VOR
ABC
S
tandby
Channel
Radial
Display
at
the
F
AF
111.10
m116.00
(030)
bc
+
}
Display
at
the
MAP
1.
Press
NA
V
to
select
the
Nav
receiver
.
2.
Set
the
Localizer
frequency
of
your
approach
as
the
Active
channel.
3.
Press
SEL.
The
display
will
prompt
you
to
enable
the
Back
Course.
Press
ENT
to
enable
the
Back
Course.
Press
SEL
and
ENT
again
to
disable
the
back
course
when
it
’s
appropriate.
When
Back
Course
is
enabled,
it
is
noted
by
“bc”
on
the
display
.
Y
ou
may
also
have
a
“bc”
annunciation
on
the
external
CDI.
4.
Set
the
S
tandby
channel
to
the
appropriate
VOR
and
note
where
a
radial
crosses
the
F
AF
and
MAP
for
your
approach.
Press
NA
V
a
second
time
to
“monitor”
the
S
tandby
channel.
A
small
“m”
will
replace
the
“s”.
5.
The
internal
CDI
(on
the
right
side
of
the
display)
and
the
external
CDI,
if
inst
alled,
will
guide
you
along
the
course
to
the
runway
.
6.
The
radial
of
the
S
tandby
channel
you
are
monitoring
will
be
shown
in
p
arentheses
to
the
right
of
the
S
tandby
channel.
7.
Use
the
monitored
S
tandby
channel
to
note
your
location
along
the
approach.
Example
Back
Course
and
Monitoring
a
S
tandby
VOR
