Textron Cessna 172R - Page 383

CESSNA
MODEL
172R
SECTION
9
-
SUPPLEMENTS
SUPPLEMENT
6
-
FAA
APPROVED
SUPPLEMENT
JP*.
BENDIX/KING
KR
87
AUTOMATIC
DIRECTION
t
FINDER
(ADF)
SECTION
1
GENERAL
\
The
Bendix/King
Digital
ADF
is
a
panel-mounted,
digitally
tuned
automatic
direction
finder.
It
is
designed
to
provide
continuous
1-
kHz
digital
tuning
in
the
frequency
range
of
200-kHz
to
1799-kHz
and
eliminates
the need
for
mechanical band
switching.
The
system
is
comprised
of
a
receiver,
a
built-in
electronics
timer,
a
bearing
indicator,
and
a
KA-44B
combined
loop
and
sense
antenna.
Operating
controls
and
displays
for
the
Bendix/King
Digital
ADF
are
shown
and
described
in
Figure
1.
The
audio
system
used
in
conjunction
with
this radio
for
speaker-phone
selection
is
shown
and
described
in
Supplement
3
of
this
handbook.
The
Bendix/King
Digital
ADF
can
be used
for
position
plotting
and
homing
procedures,
and
for
aural
reception
of
amplitude-
modulated
(AM)
signals.
The
"flip-flop"
frequency
display
allows
switching
between
pre¬
selected
"STANDBY"
and
"ACTIVE"
frequencies
by
pressing
the
frequency
transfer
button. Both
pre-selected
frequencies
are
stored
in
a
non-volatile
memory
circuit
(no
battery
power
required)
and
displayed
in
large,
easy-to-read,
self-dimming
gas
discharge
numerics. The
active
frequency
is
continuously
displayed
in
the
left
window,
while
the
right
window
will
display
either the
standby
frequency
or
the
selected
readout
from
the built-in
electronic
timer.
The
built-in
electronic timer
has
two
separate
and
independent
timing
functions.
An
automatic
flight
timer that
starts
whenever the
unit
is turned
on.
This
timer
functions
up
to
59
hours
and
59
minutes.
An
elapsed
timer
which
will
count
up
or
down
for
up
to
59
r
minutes
and
59
seconds. When
a
preset
time interval has been
programmed
and
the
countdown
reaches
:00,
the
display
will
flash
for
15
seconds.
Since
both
the
flight
timer
and
elapsed
timer
operate
independently,
it is
possible
to
monitor either
one
without
disrupting
the
other. The
pushbutton
controls
and
the
bearing
indicators
are
internally
lighted.
Intensity
is controlled
by
the
RADIO
light dimming
rheostat.
Feb
28/00
S6-3
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