CALAMP WIRELESS NETWORKS INC. GPDA Manual Do Utilizador

Referring to Figure 4, G3 commonly uses 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 transceiver antenna and

omni-directional requirements

•

  “G” - Global Positioning System (GPS)

Constraints are TX spacing of at least 24-in/60.96 cm from all transmitting antennas and a clear view
of the sky.

For the optimum antenna spacing at the frequency you are using, consult System Engineering.

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.

Install the antennas in one of the following positions:

•

 

Most preferred for all antennas: centerline of roof. For transmitter antenna, it is the ONLY accept-
able position.

•

 

Less preferred for receiver antenna: trunk lid, providing distance to transmitting antenna is respected
whether lid is opened or closed.

•

 

Much less preferred, but permissible for receiver antenna: left or right rear fenders, just in back of
rear window

•

 

Least preferred, but permissible for receiver antenna: left or right front fenders, ahead of windshield

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