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“T” indicates Mic Button is Being Depressed “R” indicates Squelch Button is Open by Received Signal
Active Comm Standby Comm Activ Nav Standby Nav
Frequency Frequency Frequency Frequency
Photocell Provides
Automatic Display
Dimming
On/Off Comm
Volume Knob.
Pull to disable
Comm Receiver
Automatic
Squelch.
Push in for
Automatic Squelch
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Communications
AMM
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.
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) 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.
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