Dataradio G3 Manual de instalação - Página 12

Procurar online ou descarregar pdf Manual de instalação para Modem Dataradio G3. Dataradio G3 20 páginas. Mobile radiomodem

Imprimir página

2.5

Antenna

The main transmitter antenna must be vehi-

cle-mounted to provide a separation distance

of 50 cm or more from all persons to avoid

radio related effects (see 2.2.1).

2.5.1 Recommended tools and

supplies

•

circle cutter, hole saw or socket punch

for antenna

•

Mini-UHF Crimp tool

2.5.2 Planning

Referring to Figure 4, G3

three separate antennas:

•

"T" - Main transceiver -

Constraints are the limit of 50 cm (see

section 2.5 above) and omni-directional

factors

•

"R" - Auxiliary receiver –

Constraints are the receiver spacing of at

least 5/8 λ (wavelength) from trans-

ceiver antenna and omni-directional re-

quirements

•

"G"

Global Positioning System

(GPS)*

Constraints are TX spacing of at least

24-in/60.96 cm from all transmitting an-

tennas and a clear view of the sky.

For the optimum antenna spacing at the fre-

quency you are using, consult System Engi-

neering.

For installation of ground-plane dependent

antennas, the center of the metal surface

used for mounting is preferable for best

omni-directional pattern.

For ground-plane independent antennas,

installation may be close to the edges of the

surface.

156 90000-508

commonly uses

2.2.1

50cm

19.7in.

≥24in.

Figure 4 - Antenna spacing

Install the antennas in one of the following

positions:

Most preferred for all antennas: center-

line of roof. For transmitter antenna, it is

the ONLY acceptable position.

Less preferred for receiver antenna:

trunk lid, providing distance to transmit-

ting antenna is respected whether lid is

opened or closed.

Much less preferred, but permissible for

receiver antenna: left or right rear fend-

ers, just in back of rear window

Least preferred, but permissible for re-

ceiver antenna: left or right front fend-

ers, ahead of windshield

Note:

Proximity to other vehicle-mounted

antennas may cause mutual inter-

ference especially at higher fre-

quencies.

G3 Installation Guide

≥5/8λ

800MHz: 9"/23cm