Textron Cessna 172R - Page 385

CESSNA
MODEL
172R
SECTION
9
-
SUPPLEMENTS
SUPPLEMENT
6
-
FAA
APPROVED
r
1.
ANT/ADF
MODE
ANNUNCIATOR
-
Antenna
(ANT)
is
selected
by
the
"out"
position
of
the
ADF
button. This
mode
improves
the
audio
reception
and is
usually
used
for
station
identification.
The
bearing
pointer
is
deactivated
and
will
park
in
the
90°
relative
position.
Automatic Direction
Finder
(ADF)
mode
is
selected
by
the
depressed
position
of
the
ADF
button.
This
mode
activates
the
bearing
pointer.
The
bearing
pointer
will
point
in
the
direction
of
the
station
relative
to
the
aircraft
heading.
2.
IN-USE
FREQUENCY
DISPLAY
-
The
frequency
to
which the
ADF
is
tuned
is
displayed
here.
The active
ADF
frequency
can
be
changed
directly
when
either
of
the
timer
functions
is
selected.
3.
BFO
(Beat
Frequency
Oscillator)
ANNUNCIATOR
-
The
BFO
mode,
activated
and
annunciated when
the
"BFO"
button is
depressed,
permits
the
carrier
wave
and associated
morse
code
identifier
broadcast
on
the carrier
wave
to
be
heard.
NOTE
CW
signals
(Morse Code)
are
unmodulated and
no
audio
will
be heard
without
use
of
BFO.
This
type
of
signal
is
not
used
in
the
United
States
air
navigation.
It
is used
in
some
foreign
countries and
marine
beacons.
4.
STANDBY
FREQUENCY/FLIGHT
TIME
OR
ELAPSED
TIME
ANNUNCIATION
-
When
FRQ
is
displayed
the
STANDBY
frequency
is
displayed
in
the
right
hand
display.
The
STANDBY
frequency
is
selected
using
the
frequency
select
knobs.
The
selected
STANDBY
frequency
is
put
into the
ACTIVE
frequency
windows
by pressing
the
frequency
transfer
button.
Either
the
standby
frequency,
the
flight
timer,
or
the
elapsed
time
is
displayed
in
this
position.
The
flight
timer
and
elapsed
timer
are
displayed
replacing
the
standby
frequency
which
goes
into
"blind"
memory
to
be called back
at
any
time
by
depressing
the
FRQ
button.
Flight
time
or
elapsed
time
are
displayed
and annunciated
alternatively by depressing
the
FLT/ET
button.
Figure
1
.
KR
87
Automatic
Direction Finder
(ADF)
(Sheet
2
of
4)
Dec
2/96
S6-5
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