General Installation Instructions; Antenna Placement - EMS Sky Connect Series Installation Manual

3.6

GENERAL INSTALLATION INSTRUCTIONS

3.6.1 ANTENNA PLACEMENT

The Aero-Antenna AT2775 L-Band antenna should be placed as far as practical from
other transmitting antenna. A minimum of 30 inches is recommended to other
L-Band transmitting antenna. The Iridium antenna is itself a transmitting antenna,
and as such, an eighteen inch minimum spacing to G.P.S. antennae is recommended.
The Iridium antenna requires full view of the sky above. Shadowing and
interference can occur when mounted near vertical stabilizers, and other structures
inherent to aircraft. When used in conjunction with an internal G.P.S. for Tracker, a
separate active Sensor S67-1575-39 G.P.S. antenna is supplied. See Figure 4 for
antenna dimensions.
Note: Inmarsat systems (commonly referred to as Satcom) will greatly interfere
with the performance of the Iridium antenna. This interference may appear
to be intermittent with aircraft position as the Inmarsat transmitting antenna
array is electrically steer able depending on azimuth to satellite. Inmarsat
will disrupt Iridium communications whenever active. Inmarsat should be
disabled when Iridium is in use, alternatively, filters are available for
Inmarsat systems which essentially act as an Iridium bandpass filter. Consult
Sky Connect for more information.
The antenna should be mounted in accordance with the manufacturer's instructions
and reference FAA AC43.13-2A. The antenna should be properly bonded to the
aircraft ground plane to aid in eliminating unwanted interference. Surface
preparation should include the use of Alodine 1001 or similar. The antennae listed
above, as well as the Sensor S67-1575-109 Iridium antenna are all TSO'd and
approved for mounting on pressurized vessels.
Antenna installations on pressurized vessels require FAA approved design and
engineering data whenever a pressure vessel requires penetration due to
connector/mounting holes. Approved designs can be obtained from aircraft
manufacturers, STC data specific to the antenna, or DERs. Seal antenna in
accordance with FAA AC43.13-2A.
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1616-964-12
Date: 7/27/2011
Rev. 2.1