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SYSTEM DESCRIPTION, INSTALLATION, AND MAINTENANCE MANUAL
1.
General
A.
Prior to Installation
(1)
Upon receipt of the terminal, the components should be confirmed present against the
enclosed parts list and inspected for any damage.
(2)
The UAV satcom system's environmental parameters should be reviewed to ensure that the
intended usage is within its envelope.
(3)
An acceptable antenna mounting point should be identified and any UAV specific mounting
parts procured or fabricated.
(4)
A weight distribution analysis should be performed to demonstrate safe operation of the UAV
subject to the mounting constraints outlined in the following sections.
(5)
An electrical load analysis should be performed to ensure that the UAV can safely carry the
additional electrical load. This is a maximum of 65 W.
(6)
The terminal should be powered from a fused distribution board with voltage of 28V DC (27 to
30V DC). The fuse protecting the terminal supply circuit should be a 4A Fast Acting type, with a
minimum interruption rating of 1000A. A recommended model is Littelfuse 0297004.WXNV
which can be used in conjunction with the associated in-line holder Littelfuse 0FHM0001ZXJ.
(7)
There should be a power isolation switch that can be operated without approaching within
3.517 ft (1.07 m) of the antenna.
(8)
Safety precautions should be observed during installation and UAV maintenance.
(9)
Integration with the avionic systems should be such that failure of terminals function should
have no effect on the UAV's operational capability, safety or flying operator's workload.
2.
Mechanical Installation
A.
Antenna Mounting
(1)
The safety distance between operator and antenna is 3.517 ft (1.07 m).
(2)
The antenna should be mounted so that it is in a horizontal plane when the UAV is flying
straight and level. Refer to Figure 5 for antenna dimensions.
(3)
The antenna should be positioned on the upper surface of the fuselage, near the centre-line
of the UAV so that it has an unobstructed view of elevations above 5° for all azimuths. The
connective performance for elevations below 20° will be degraded.
(4)
The antenna should not adversely affect the control surfaces of the UAV.
(5)
Separation resulting in greater than 42 dB isolation should be provided between the antenna
and any other GPS antennas on the UAV at 1559 to 1605 MHz and 1626.5 to 1675.0 MHz
(Satcom band), 32 inch is typically required. If GLONASS is being used, the separation between
the antenna and the GLONASS antenna should be sufficient to provide 50 dB isolation
between them at 1559 to 1610 MHz and 1626.5 to 1675.0 MHz (Satcom band), 83 inch
is typically required.
(6)
GNSS antennas on the UAV should be compliant on DO-229D or later.
Honeywell International Inc. Do not copy without express permission of Honeywell.
SMALL SATCOM
SECTION 2 – INSTALLATION
Page 11
18 Feb 2021
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