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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