Textron 172R180HP, Pilot Operating Handbook

Page: 335 / 396

CESSNA
MODEL 172R
SECTION 9 - SUPPLEMENTS
SUPPLEMENT 6 - FAA APPROVED
SUPPLEMENT
BENDIX/KING KR 87 ADFAUTOMATIC DIRECTION
FINDER
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-448 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
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.
Dec 2/96 S6-3