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COMM
PULL
TEST
OFF CHAN PULL 25K PULL OBS
PULL
IDENT TIMER
MODE
STBY
T
NAV STBY
123.50 118.30 113.00 117.80
Active Comm
Frequency
“T” indicates Mic Button is Being Depressed
“R” indicates Squelch Button is Open by Received Signal
Standby Comm
Frequency
Activ Nav
Frequency
On/Off Comm
Volume Knob.
Pull to disable
Comm Receiver
Automatic
Squelch.
Push in for
Automatic Squelch
Comm Frequency
Transfer Button
Channel
Button
Comm Frequency
Select Knobs
Nav Frequency
Transfer Button
Nav Frequency
Select Knobs
Photocell Provides
Automatic Display
Dimming
Nav Mode
Nav Audio Button
Volume Control.
Pull to hear
Morse Code
Nav Ident
Figure 3: Bendix/King KX 155A NAV/COM
Bendix/King KX 165A looks similar
AIRCRAFT
DA 40 Series
AMM
Communications
Doc # 6.02.01
Rev. 5 23-10-00 Page 7
20 Sep 2007
B. KX 155A and 165A NAV/COM
Figure 3 shows the KX 155A/165A NAV/COM unit. It is located in the avionics rack in the
instrument panel, see Chapter 31.
The KX 155A/165A has these functions:
) Two-way voice communication in the frequency range 118 MHz to 136.975 MHz in 25 kHz
increments. This gives 760 communication channel operation.
) Receiving navigation signals in the frequency range 108 MHz to 117.95 MHz in 50 kHz
increments. This gives 200 navigation channel operation.
) Receiving glideslope signals in the frequency range 329.15 MHz to 335 MHz in 150 kHz
increments (KX 165A only).
) VOR/LOC signal converter. The Course Deviation Indicator (CDI) can show VOR headings.
The KX 155A/165A has the communications control on the left and it has the navigation controls
on the right. It has these controls:
) OFF/PULL/TEST knob. Turn the knob fully counter-clockwise to switch the system OFF. Turn
the knob clockwise to switch the unit ON and to set the volume. Pull the knob out to stop the
operation of the automatic squelch and to set the volume. Push the knob in to set automatic
squelch.
) COM FREQUENCY SELECT knobs. The outer knob controls the 3 digits to the left of the
decimal point (1 MHz steps) and the inner knob controls the 2 digits to the right of the decimal
point (50 kHz steps with the knob pushed in and 25 kHz steps with the knob pulled out).
) COM display. The COM display has 4 parts:
) The top left part shows the in-use frequency (USE).
) The top right part shows the standby frequency (STBY).
) The top center part has an indicator. The indicator shows “T” when the transmit operates and
“R” when the set is receiving a signal that is strong enough to open the squelch.
) The lower right part shows the selected channel number (1 - 32), when the system is in the
channel mode of operation.
) COM frequency transfer button. The transfer button moves the active frequency to standby and
the standby frequency to active.
AIRCRAFT
Communications DA 40 Series
AMM
Page 8
20 Sep 2007 23-10-00 Doc # 6.02.01
Rev. 5
) CHAN button. Press the channel button for 2 seconds or more to enter channel programming
mode of operation. Momentarily press the channel button to save the programming information
and return to the normal mode of operation.
) NAV FREQUENCY SELECT knobs. The outer knob controls the 3 digits to the left of the
decimal point (1 MHz steps), and the inner knob controls the 2 digits to the right of the decimal
point (50 kHz steps).
) NAV display. The NAV display has these 4 parts:
) The top left part shows the in-use frequency (ACTIVE).
) The top right part shows this information:
• Standby frequency (STBY), when in ACTIVE/STANDBY format.
• A three-digit Omni Bearing Selector (OBS) course when in ACTIVE/CDI (Course
Deviation Indicator) mode.
• LOC when the active frequency is tuned to a localizer frequency.
• A three-digit bearing, showing ‘Fr’, when in ACTIVE VOR/RADIAL mode.
• A three-digit bearing, showing ‘To’, when in ACTIVE VOR/BEARING mode.
• Elapsed time or countdown time when in TIMER mode.
) The top center part has an indicator which shows ‘OBS’ when the system is in ACTIVE/CDI
mode.
) The lower part shows this information:
• The course deviation indicator when in ACTIVE/CDI mode and the active frequency is
tuned to a VOR or localizer frequency.
• 'FLAG’ when the signal received is too weak for the system to display accurate
information.
) NAV frequency transfer/TIMER button. Push this button to move the active frequency to standby
　
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