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IMPORTANT:The locking rod is located close to one side of the KTR 2280A. As the
locking rod is tightened, use the opposite hand to press the opposite side of the KTR
2280A into the installation rack. This will ensure that the KTR 2280A is
fully inserted within the mounting rack.
The KTR 2280A must use the internal fans or a part of the mounting rack for air cooling.
The mounting racks and other objects will be installed as per the instructions in the in-
stallations in the installation drawing to allow air flow through the chassis.
CAUTION:
(2)
Using a 3/32 inch allen wrench, turn the locking rod clockwise until it has drawn the unit
into the rack and mating connectors and is tight.
CAUTION:
To remove the unit, turn the securing rod counter clockwise until it disengages from the mounting tray. Then,
pull the unit out of the mounting rack.
The KTR 2280A can be installed in any orientation. For additional KTR 2280A installation information, refer to
Figure 2-21 (KTR 2280A Installation Drawing).
2.3.4
Antenna Mechanical Installation
2.3.4.1
VHF COM Antennas
The VHF COM antenna must be mounted as far away as possible (8 feet, minimum) from other similar antennas
and the vertical stabilizer. Mounting the COM antenna as far away as possible from the navigation antenna will
help reduce COM to NAV interference. The COM antenna must also be mounted as far away as possible from
an ELT antenna to prevent distortion of the radiated pattern and to prevent radiated broadband noise from the
ELT when excited by the COM transmissions. Radiated broadband noise from an ELT is a common cause of
COM-to-COM and COM-to-NAV interference. Mounting one antenna on top of the fuselage at the highest
location to ensure a good radiation pattern and the other on the bottom of the fuselage offers good separation
with a minimum of interaction.
It is recommended that one COM transceiver be connected to the top antenna for good ground communication
and that the other COM transceiver be connected to the bottom antenna to provide good airborne
communications. If mounting antennas on the same side of the aircraft is unavoidable, maintain the minimum
allowable separation (8 feet).
The antenna must be mounted on a section of the aircraft that is horizontal during cruise flight. The base of the
antenna must be well bonded to the metal aircraft skin. Remove any paint from around the mounting holes to
ensure a good connection between the antenna and the skin. The metal aircraft skin at the base of the antenna
must extend a minimum of twenty-four inches in every direction. This provides the ground plane required for the
antenna. Any less metallized area will result in reduced communication range at some bearings around the
aircraft and can increase interference to and from other systems.
The COM transceiver performance depends heavily on the integrity of the electrical bonding to the airframe and
also the electrical integrity of the aircraft structure. If the electrical resistance between an antenna and the
aircraft or between adjacent skin panels change intermittently, noisy communications can result.
© Honeywell International Inc. Do not copy without express permission of Honeywell.
SYSTEM INSTALLATION MANUAL
KTR 2280A
DO NOT OVERTIGHTEN THE LOCKING ROD.
DO NOT USE BALL END ALLEN WRENCHES.
Page 2-3
15 May 2017
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