SkyTrac Systems Ltd.
Document Rev. 02.010 ISAT-100-OPD-SOI Page 16 of 26
Restricted Proprietary and Confidential Information
4.5 Antenna Installation
Active L1 GPS Passive Iridium Antenna (P/N: STS0021
1
)
The standard ISAT-100 installation will use a combination, active L1 GPS/Passive
low profile, molded radome, Iridium antenna (P/N: STS0021
1
). This recommended
system antenna is only available directly from SkyTrac Systems Ltd. Please contact
SkyTrac Systems to discuss the feasibility of using alternate antenna, if required.
The combination antenna must be installed at least three feet away
from any
other GPS antenna. It is imperative that the antenna be mounted outside, as high as
possible and in a horizontal position on the aircraft, attempting to achieve a 360-
degree view of the sky with minimal obstructions.
IMPORTANT NOTE: This antenna uses SMA connectors for the GPS jack and
TNC connectors for the L-Band or Iridium jack. Immediate damage will occur to
the ISAT-100 if either cable is connected to the wrong jack.
The use of RG-400 low-loss coaxial cable restricts the maximum length of the cable
to 18 ft. If a longer run is required, use lower loss coax cable like ECS 310801,
311601, 311501, 311201 and refer to manufacturers specs for attenuation at 1.6
GHz. Attenuation of equal or less than 3dB is required. The bond between the
airframe and the antenna needs to be 10 milliohms or less.
Prepare the mounting location by drilling holes in the aircraft skin or through a
mounting plate. Use a doubler plate of 4 x 6 inches if antenna is installed on a non-
metallic aircraft surface to create a ground plane. The plate must have an electrical
connection to the antenna ground.
Installation of an antenna on the aircraft should be performed only as defined by the
aircraft manufacturer or in accordance with TC or FAA approved engineering data.
Special caution must be observed when installing antennae in pressurized aircraft.
Note: The ISAT combination antenna includes a rubber seal that must be
properly installed into the groove on the underside of the antenna prior to
mounting the antenna. This seal acts as an environmental seal from the
outside atmosphere. Any connections that are not protected from the outside
atmosphere by the rubber antenna seal should have an environmental seal
applied to them during installation.
1
STS0021 is the new part number for STS-ISAT-ANT
The document reference is online, please check the correspondence between the online documentation and the printed version.
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