Cessna 172SPHUSR05 Pilot Operating Handbook page 335

C ESSNA
MODEL 1 72S
BENDIX/KING KR 87 AUTOMATIC DIRECTION
FINDER (ADF)
The Bendix/King Digital ADF is a panel-mounted, digitally tuned
automatic d i rection finder . It is designed to provide contin uous 1 -
kHz digital tuni ng i n the frequency range of 200-kHz to 1 799-kHz
and elim inates the need for mechanical band switching.
system is comprised of a receiver, a built-in electronics timer, a
bearing i ndicator, and a KA-44B combined loop and sense antenna.
Operating controls and d isplays for the Bendix/King Digital ADF are
shown and described i n Figure 1 . The audio system used i n
conjunction with this radio for speaker-phone selection i s 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
selected "STAN DBY" and "ACTIVE " frequencies by pressing the
frequency transfer button . Both pre-selected frequencies are stored
i n a non-volatile memory circuit (no battery power required) and
displayed in large, easy-to-read , self-dimming gas discharge
n umerics. The active frequency is continuously displayed in the left
window, while the right window wil l 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
u nit is turned on.
m i nutes. An elapsed timer which wil l count up or down for up to 59
m i nutes and 59 seconds. When a preset time interval has been
programmed and the countdown reaches :00, the display will flash
for 1 5 seconds.
operate i ndependently, it is possible to monitor either one without
disrupting the other. The pushbutton controls and the bearing
indicators are internally l ighted. Intensity is controlled by the RADIO
light dimming rheostat.
May 30/00
S U PPLEMENT 6 - FAA APPROVED
SECTION 1
GENERAL
frequ ency display allows switching between pre­
II
This timer functions up to 59 hours and 59
Since both the flight timer and elapsed timer
S ECTION 9 - SUPPLEMENTS
I
The
86-3