Mounting considerations
98-145168-A Chapter 4: Installation 4-5
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4.2.4 LGA-5005 HELGA
Refer to the LGA-5005 HELGA Installation Manual [8] for instructions and details on the
installation of the antenna. Make sure all requirements in the antenna mounting
instructions are met. Place the antenna with unobstructed view to the satellite. The outline
drawing is shown in Figure 3-4: Outline Drawing: HELGA (1/2).
An AVIATOR 200S System can only be used with the LGA-5005 HELGA.
Coaxial cable between the CSDU and the antenna
1. Do not bend the cables to a radius smaller than the minimum bend radius stated for the
cables.
2. Measure all RF losses at 1.6 GHz.
1
3. As the installation is designed to allow power on a coaxial cable, make sure that the DC
resistance is no more than 0.6 Ohms.
4. Make sure that the system meets its requirements with the following RF cable loss
ranges:
For further information on cables, see To wire the antenna on page 4-10 and
Recommended RF cables on page 4-29.
The antenna installation must be in accordance with the aircraft manufacturers
requirements and/or FAA AC 43.13 - 1B/2A and approved by the appropriate Civil
Aviation Authorities.
WARNING! Keep a safety distance of minimum 60 cm (2 ft) to the antenna
when the system is transmitting, unless the antenna manual or the specific
system configuration presents different requirements. This safety distance
ensures that a maximum radiation power density of 5 mW/cm
2
is not
exceeded (Recommended by the American National Standards Institute,
ANSI/IEEE C95.1-1999).
CAUTION! The system contains items that are sensitive to electrostatic
discharge. Use approved industry precautions to keep the risk of damage to a
minimum when you touch, remove or insert parts or assemblies.
1. Cable losses from ARINC 781-7, Attachment 7, section 2.2.6.
Cable Loss (dB)
Tx/Rx cable, CSDU to ELGA 0 to 18 dB
Table 4-1: RF cable loss range
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