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The GNS430W has these controls:
(a) Left-Hand Keys and Knobs
COM Power/Volume Knob - controls unit power and communications radio volume. To
override the squelch function, press the COM power/volume knob.
VLOC Volume Knob – controls audio volume for the selected VOR/Localizer frequency.
Large (Outer) Left Knob – is use to tune the MHz value of the standby frequency for the
communications transceiver (COM) or the VLOC receiver.
Small (Inner) Left Knob – is use to tune kHz value of the standby frequency for the
communications transceiver (COM) or the VLOC receiver.
COMM Flip-Flop Key – is use to swap the active and standby COM frequencies.
VLOC Flip-Flop Key – is use to swap the active and standby VLOC frequencies.
(b) Right Hand Keys and Knobs.
Refer to Chapter 34-50 for the GPS functions
To operate the unit set the GEN/BAT switch and AVIONICS MASTER switch to ON. The
related circuit-breakers must be closed. Turn the COM Power/Volume knob clockwise from
the OFF position. The display will show the frequency last stored in the non-volatile memory.
The DIM/BRIGHT switch (located on the instrument panel) controls the brightness of the
display.
Refer to the operators handbook provided with the equipment for additional information.
Communications
DA20-C1 AMM
Page 10
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Rev. 15
Figure 6: Bendix\King KX 155 NAV COMM
DA20-C1 AMM
Communications
Doc # DA201-C1
Rev. 15 23-10-00 Page 11
30 Apr 2009
3. Bendix\King KX 155 NAV COM
Figure 6 shows the KX 155 NAV COM. The KX 155 is a VHF communications transceiver and a
NAV receiver (See Chapter 34-50 for the NAV functions). The equipment can receive COMM
signals from 118.00 MHz to 136.975 MHz in 25 kHz increments. This gives 760 channel
operation.
The left hand display panel shows COMM frequency data. The left side shows the COMM USE
frequency. The right side shows the STBY frequency. When the equipment transmits, a T
annunciator comes on between the COMM USE frequency and the STBY frequency.
When the power is off, a non-volatile memory holds the frequency that was last used. A photocell
in the display controls the display brightness.
The KX 155 has these controls:
− An OFF/PULL TEST switch.
− COMM frequency selector knobs.
− A COMM frequency transfer button.
The press-to-transmit buttons on the pilot’s control sticks (or hand mic) control the transmitter.
The OFF/PULL TEST rotary switch controls power to the equipment. The full counter-clockwise
position is OFF. Movement clockwise gives volume control. The KX 155 has automatic squelch.
Pull the switch to cancel the squelch for test purposes.
To operate the unit set the GEN/BAT switch and AVIONICS MASTER switch to ON. The related
circuit-breakers must be closed. Turn the COMM OFF/PULL TEST knob clockwise from the
OFF position
To change the frequency, turn the large frequency selector knob for 1 MHz increments. Turn the
small frequency selector knob for 50 kHz increments. Pull the small knob out to set 25 kHz
increments. When you turn the selector knobs, the STBY frequency changes. Push the COMM
frequency transfer button to toggle the USE and STBY frequencies.
If the equipment finds an in-valid frequency in the non-volatile memory, both USE and STBY
frequencies show 120.00 when power is applied.
Communications
DA20-C1 AMM
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Rev. 15
Intentionally left blank
DA20-C1 AMM
Communications
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TROUBLE-SHOOTING
1. General
Use the data below to trouble-shoot the communications systems.
Complaint Possible Cause Remedy
Note : For the faults shown below: use the hand mic, set the intercom to OFF, listen
to the speaker or pilot’s headphones:
LCD display hard to read
(KX 125, GNS430W, AND
GNS530W only).
Contrast adjustment too low. Adjust the contrast.
(See Figures 2, 4, and 5)
Radio check reports readability
good, strength poor due to low
modulation.
Mic output low.
Faulty radio.
Replace the defective mic.
Replace the radio.
Radio check reports readability
poor, strength good.
Faulty radio.
Faulty mic.
Replace the radio.
Replace the defective mic.
Radio check reports readability
poor, strength poor.
Received audio is poor.
Co-ax connector faulty.
Faulty radio.
Faulty antenna.
Examine the co-ax and
connections for condition and
security.
Replace the radio.
Replace the antenna.
　
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