Honeywell International Inc. KSN770 사용자 설명서
Draft
Page 2-49
6 Dec 2012
34-70-06
SYSTEM INSTALLATION MANUAL
066-01204 / 066-01213
© Honeywell International Inc. Do not copy without express permission of Honeywell.
2.4.2
COM and NAV Antenna Installation Considerations
2.4.2.1
COM Antenna Location
The VHF COM antenna must be mounted as far away as possible (8.0 feet [244 cm] 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 affecting 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.
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 affecting 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 GND
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 (8.0 feet [244 cm]).
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 (8.0 feet [244 cm]).
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 24.0 inches (610 mm) in every direction.
This provides the GND plane required for the antenna. Any less metallized area will result in reduced
communication range at some bearings around the aircraft and may increase interference to and from
other systems.
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 24.0 inches (610 mm) in every direction.
This provides the GND plane required for the antenna. Any less metallized area will result in reduced
communication range at some bearings around the aircraft and may 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 changed intermittently, noisy
communications may result.
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 changed intermittently, noisy
communications may result.
Connect the antenna to the COM unit with 50-ohm coaxial cable, keeping the cable length to a
minimum and avoiding sharp bends in the cable. Keep the COM antenna cable as far away from other
antenna cables as possible and do not bundle several antenna cables together. Prepare the cable to
the BNC connector as shown in Figure 2-6.
minimum and avoiding sharp bends in the cable. Keep the COM antenna cable as far away from other
antenna cables as possible and do not bundle several antenna cables together. Prepare the cable to
the BNC connector as shown in Figure 2-6.
Use Dow-Corning DC-4, or equivalent, on both inside and outside of the connector and its mate as
an effective barrier against moisture and to prevent corrosion.
an effective barrier against moisture and to prevent corrosion.
2.4.2.2
NAV Antenna Location
The NAV antenna must be well removed from other antennas, projections, engines or propellers. It
must have a clear line of sight area if possible. The antenna must be mounted symmetrically with the
center line of the aircraft. Avoid running other coaxial cables and wires near the NAV antenna cable.
must have a clear line of sight area if possible. The antenna must be mounted symmetrically with the
center line of the aircraft. Avoid running other coaxial cables and wires near the NAV antenna cable.
The VOR/LOC antenna with Glideslope is a two piece dipole with one part mounted on each side of
the vertical stabilizer. It must be installed on the upper section of the vertical stabilizer of single finned
aircraft and be at least 28.0 inches (711 mm) (measured vertically) from the horizontal stabilizer.
the vertical stabilizer. It must be installed on the upper section of the vertical stabilizer of single finned
aircraft and be at least 28.0 inches (711 mm) (measured vertically) from the horizontal stabilizer.
Draft as of 10/15/2012