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HGA-6000 High Gain Antenna
Installation Manual
4.2.3 Co-location with other Antennas
The systems most likely to be affected by the HGA-6000 system are GPS, Iridium, and other
SATCOM systems, such as Ku-Band equipment. The installer needs to take this into account when
planning an installation. For each new combination of equipment, empirical verification may be
required.
4.2.4 Grounding
1)
Although not required for correct operation of the antenna, grounding resistance between the
HGA-6000 and the aircraft is often specified by the airframe manufacturer. Typical values fall
in a range between 2.5 m and 20 m. This can be calculated by the difference in resistance
between the RF cable connector screen and one of the mounting points, and the same point
on the cable and the airframe close to the mounting point.
2)
Grounding between the HGA and the mounting plate will be by means of the 4 mounting
screws at the base of the antenna.
manufacturer (e.g. no paint or other insulating substances should be present at these contact
points).
3)
Grounding between the mounting plate and the aircraft can be by means of the 4 mounting
bolts and grounded aircraft anchor nuts. If a separate mounting plate is used, a ground strap
screwed to one of the grounding holes on the plate can provide alternative grounding.
4.3 Mounting Procedure
1) If a separate mounting plate is utilized, mount the HGA-6000 to the mounting plate prior to
aircraft installation. Otherwise, mount directly onto aircraft mounting structure. Four ¼ inch
28UNF screws need to be used for this purpose. Torque the screws to 5.2 ft-lb (7 Nm).
2) Align the HGA-6000 mounting plate holes with the mounting holes on the aircraft. Insert the
mounting bolts and torque down evenly. (Refer to hole tolerances given in Figure 7 in case
Cobham mounting plate is not used)
3) Verify the ground resistance to the antenna is within a suitable range.
4) Install a cable loom as applicable to your installation into the Aircraft.
connector of the loom is within the required length from the HGA-6000.
5) Install the coaxial feed from the DLNA to within 12 inches of the HGA-6000 and connect the
antenna's TNC connector. Tighten to a maximum of 0.7 ft-lb (1 Nm).
NOTE: Correct installation can only be verified when final system checkout is conducted.
Retain access to antenna installation for this purpose
6) Connect a PC to the HGA-6000 maintenance port. This step is not required if you are using the
SDU-73XX or the BSU-7100. The offset angles may be programmed in the Antenna or the
BSU/SDU, which is preferable.
7) Power up the system.
8) Enter the mounting angles (into the SDU, BSU or Antenna) that have been recorded previously
as described in Section 4.2.2.2.
Document: 862-A0059_IM issue 1.7
Electrical contact may be required by the airframe
Ensure that the
COMPANY CONFIDENTIAL
Page 22 of 37
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