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band. It also gives audio reception so that the pilot can identify stations and listen to weather
broadcasts in the AM broadcast band.
AIRCRAFT
Navigation
DA 40 Series
AMM
Page 2
20 Sep 2007 34-53-00 Doc # 6.02.01
Rev. 5
IN USE
Frequency
ANT/ADF Mode
Annunciation
Photocell
provides
Automatic
Display
Dimming
ANT/ADF Mode
Button
BFO
Button
Frequency
Transfer Button
Flight Timer/Elapsed
Timer Select Button
Flight Timer/Elapsed
Set/Reset Button
Power/
Audio Volume
Frequency Select
Knobs
BFO mode
Annunciation
Standby Frequency
Mode Annunciation
STANDBY Frequency,
Flight/Elapsed Time
Flight Timer and Elapsed Timer
Mode Annunciation
ANT 323 BFO 650 FLT
ADF
FRQ ET
BENDIX/KING
KR 87 TSO
ADF BFO OFF
VOL
ADF
FRQ/ ET/ SET/ FLT RST
STBY/
TIMER
Figure 1: Bendix/King KR 87 ADF Receiver
AIRCRAFT
DA 40 Series
AMM
Navigation
Doc # 6.02.01
Rev. 5 34-53-00 Page 3
20 Sep 2007
The ADF receiver has a gas-discharge display with automatic dimming that shows the following:
) The left window shows the 'active' frequency.
) The right window shows the 'standby' frequency or the selected readout from the built-in
electronic timer (flight time or elapsed time).
) FRQ/FLT/ET indicators. These indicate which information is being shown in the right window
(see above).
) ANT/ADF mode indicator. It indicates 'antenna' mode (ANT) or 'ADF' mode that is selected with
the ADF button.
) BFO indicator. It indicates that the BFO mode is selected with the BFO button.
The ADF receiver has these controls:
) ON/OFF/VOL rotary switch. This switch controls power to the ADF. It also sets the audio
volume.
) Frequency select knobs. The small knob is pulled out to tune the 1´s. The small knob is pushed
in to tune the 10´s. The outer knob tunes the 100´s with rollover into the 1000´s up to 1799.
When the right window is set to standby frequency (FRQ) mode, then the knobs change the
'standby' frequency. When a timer mode (FLT or ET) is selected, then the knobs change the
'active' frequency.
) ADF button. When the button is in, the ADF mode is selected.
When the button is out, the 'antenna' (ANT) mode is selected. The loop antenna is disabled, and
the unit simply acts as a receiver. The bearing pointer is deactivated and will park in the 90°
relative position.
) BFO (beat frequency oscillator) button. It permits the carrier wave and associated morse code
identifier broadcast on the carrier wave to be heard.
) FRQ (frequency transfer) button. It switches the right window to the 'FRQ' mode and exchanges
the 'active' and 'standby' frequencies.
) FLT/ET (flight timer/elapsed timer mode selector) button. It alternatively selects either 'flight
timer' mode or 'elapsed timer' mode.
) SET/RST (set/reset elapsed timer) button. When pressed, this button resets the elapsed timer
(whether it is being displayed or not).
AIRCRAFT
Navigation
DA 40 Series
AMM
Page 4
20 Sep 2007 34-53-00 Doc # 6.02.01
Rev. 5
HDG
N
6
3
33
30
E
12
15
W
24
21
S
Compass
Card
Heading
Knob
Bearing
Pointer
Symbolic
Aircraft
Lubber
Line
Figure 2: Bendix/King KI 227 ADF Indicator
AIRCRAFT
DA 40 Series
AMM
Navigation
Doc # 6.02.01
Rev. 5 34-53-00 Page 5
20 Sep 2007
B. ADF Indicator
Figure 2 shows the Bendix/King KI 227 ADF indicator. It is located in the left-hand section of the
instrument panel.
The non-slaved ADF indicator has the following features:
) Lubber line. It indicates magnetic heading of the airplane.
) Bearing pointer. It indicates magnetic bearing to the station.
) HDG knob. This knob rotates the compass card.
The slaved ADF indicator has the following additional features:
) Slaved compass card. It derives its heading input from the gyro compass system. Refer to
Section 34-28 for details about the gyro compass system.
) SYNC knob instead of HDG knob. The compass card is synchronized to the HSI compass card
by rotating the SYNC knob until the heading matches that of the HSI.
C. ADF Antenna
The Bendix/King KA 44B ADF antenna is located on the lower side of the fuselage, under the
baggage compartment. It has both loop and sense amplifiers, pre-amplifiers, and modulators. They
combine the loop and sense antenna signals into a single RF signal.
　
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