Motorola MSAT-G2 설치 매뉴얼 - 페이지 16

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The Antenna Unit (AU)

The antenna unit is composed of the antenna element array, necessary high power and low

noise amplifier systems and a tracking system.

Two AU versions exist: a 2-axis unit intended for land-mobile and fixed-site installations and

a 3-axis unit for the maritime environment.

Connection to both AUs is made by a TNC connector. The single co-axial cable carries RX,

TX, power and tracking information.

The radio has been type approved for use with the following cable lengths and types:

WARNING: Avoid exposure to microwave radiation. Keep a safe distance of minimum

one 1 meter (39 inches) to the side and above the antenna. Always power the MSAT-G2

down prior to disconnecting or connecting the antenna.

The antenna port is a 50 Ohm female TNC. This line carries RF, signaling, and DC power for

the antenna. Note: Grounding the center conductor while power is applied to the transceiver

can cause the transceiver's fuse and/or a fuse in the vehicle to blow. No modifications should

be made to the RF cable under any circumstance.

Keep a clear line-of-sight to the satellite. Preferably, avoid all obstructions within three (3)

meters of the antenna. Obstructions less than 15 cm (6 inches) in diameter can be ignored

beyond this distance.

If the antenna is being mounted on a vehicle it is important to ensure there is a clear line-of-

site to the satellite(s) in all directions. After the radio is commissioned and operational it is

recommended that the signal strength be checked while the vehicle is slowly driven in a 360º

circle. The signal strength should not vary significantly or be degraded in any particular direction.

MSAT-G2 Installation Guide

Cable Length

Antenna to Radio

20 ft

60 ft

150 ft

Figure 15 – Antenna Cable Lengths and Types

Cable Type

RG223/U

LMR240 (Equiv.)

LMR600 (Equiv.)