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3.1.2
VHF NAV Controls and Displays
A.
Frequency Selectors: An active frequency (channel) and a standby frequency (channel)
selector. A "swap" or "flip-flop" button may be available for swapping the active and standby
frequencies. The KTR 2280A responds to high speed ARINC 429 labels 034 and 053 for the
active and standby selections respectively. These labels appear only when a frequency
(channel) change is made.
B.
Volume Control: A rotational knob or up/down pushbutton to adjust the volume of the NAV
audio output. The KTR 2280A responds to high speed ARINC 429 label 265 for the volume
control setting. This label appears only when a volume change is made.
C.
Ident Tone Control: A means to defeat the Ident Tone notch filter in the NAV audio so the 1020
Hz Ident Tone can be heard. The KTR 2280A responds to high speed ARINC 429 label 265 for
ident filter control. This label only occurs when a status change is made.
D.
The NAV Station Ident is Output on Label 242 and 244.
E.
KTR 2280A responds to high speed ARINC 429 label 033 for VDB mode selection. This label
only occurs when a mode change is made.
3.1.3
ADF Controls and Displays
A.
Frequency Selectors: An active frequency (channel) and a standby frequency (channel)
selector. A "swap" or "flip-flop" button may be available for swapping the active and standby
frequencies. The KTR 2280A responds to high speed ARINC 429 label 032 for frequency
selection. This label only occurs when a frequency (channel) change is made.
B.
Volume Control: A rotational knob or up/down pushbutton to adjust the volume of the ADF audio
output. The KTR 2280A responds to high speed ARINC 429 label 262 for volume setting. This
label only occurs when a change is made.
C.
Mode Control: A means to select the following ADF operating modes:
ADF Mode - The normal ADF operating mode.
ANT Mode - The mode in which ADF bearing information is defeated and receiver sensitivity
and bandwidth are optimized for audio reception only.
BFO Mode - The mode required in order to use first generation NDB facilities that used on/off
carrier keying for identification.
The KTR 2280A responds to high speed ARINC 429 label 032 for mode selection. This label
only occurs when a change is made.
3.1.4
VDL Mode A and VDL Mode 2
A.
VDL Mode A
Mode A allows the KTR 2280A to exchange downlink and uplink POA data messages with a
CMF through a transmit/receive pair of 100 Kbps ARINC 429 digital interfaces.
© Honeywell International Inc. Do not copy without express permission of Honeywell.
SYSTEM INSTALLATION MANUAL
KTR 2280A
Page 3-2
15 May 2017
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