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E. COM 2 Antenna
The COM 2 antenna (Comant DM C63-2) is mounted on the lower surface of the fuselage, aft of the cockpit.
F. NAV Antenna
The NAV (VOR/LOC/GS) antenna (Comant CI 157P) is integrated in the horizontal stabilizer.
G. NAV Antenna Coupler
%  The NAV antenna coupler (Comant CI 505 or CI 1125) is located on the instrument panel floor on
%  a connector mounting behind the avionics rack. It divides the signal which comes from the NAV antenna into individual signals for the NAV 1 receiver, the NAV 2 receiver, and the glideslope receiver.
% H. Ground COM #2 switch
% The ground COM #2 switch is located on the instrument panel directly left of the annunciator panel, % see Chapter 31.
% The ground COM #2 switch is a toggle type switch. When it is set to ON, then the COM #2 % transceiver can be used on the ground without switching the master switch ON. Refer to Chapter % 92 for wiring diagrams.
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Trouble-Shooting
1. General
The table below lists the defects you could have with the speech communication system. Refer to % Section 34-52 for trouble-shooting the VOR/LOC/GS system. Refer to Section 34-58 for trouble-% shooting the GPS system.
If you have the trouble detailed in the Trouble column read across to the Possible Cause column. Then do the repair given in the Repair column.
Trouble  Possible Cause  Repair 
LCD display hard to read.  Contrast adjustment not correct.  Adjust contrast. 
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 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. 
Short range in transmit mode, but reception is ok.  Faulty radio.  Replace the radio. 
No voice modulation when transmitting from one pilot's side. The other pilots side OK.  Audio integrating fault. Head-set defective.  Refer to Section 23-50. Replace head-set. 
Cannot transmit. Transmit annunciator not shown in COM display.  Faulty PTT switch. PTT wiring circuit defective. Faulty radio.  Replace PTT switch. Do a test of the PTT wiring circuit. Refer to Chapter 92 for the wiring diagrams. Replace the radio. 

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Maintenance Practices
1. General
This section tells you how to remove/install the main components of the speech communication system. Refer to the equipment manufacturer's manuals for more data about the equipment.
% 2. Remove/Install the NAV/COM unit or NAV/COM/GPS unit % A. Remove the NAV/COM unit or NAV/COM/GPS unit
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Detail Steps/Work Items  Key Items/References 
(1)  Open the related circuit breaker(s).  NAV/COM circuit breaker for the NAV/COM unit. COM and NAV/GPS circuit breakers for the COM/NAV/GPS unit. 
(2)  Put a 3/32 Allen wrench into the access hole for the locking screw. Engage the wrench into the screw.  Refer to Figure 2 (KX 125), Figure 3 (KX 155A/165A), Figure 4 (GNS 430) or Figure 5 (GNS 530). 
(3)  Turn the screw counter-clockwise until the unit disengages from the mounting rack. 
CAUTION: DO NOT PULL ON THE KNOBS. DO NOT PRY THE FACE-PLATE. YOU CAN DAMAGE THE UNIT. CAUTION: DO NOT TOUCH THE CONNECTOR CARD AT THE REAR OF THE UNIT. THE ELECTROSTATIC CHARGE OF YOUR BODY CAN DAMAGE THE UNIT. 
　
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