Sierra Wireless MP 595 - Manual (Page 27)

Hardware and Software Installation
The built-in GPS module requires a dedicated GPS antenna or
a combination antenna with cables to both the RF and GPS
antenna connectors on the MP modem.
If you already have an MP Modem Combo GPS antenna, you
can re-use it with your new MP modem. This antenna has two
leads—one for RF (TNC connector) and one for GPS (SMA
connector).
RF antennas
Use an approved RF antenna to connect to the wireless
network. The antenna must have 50 ohms impedance and a
cable with a TNC connector (or SMA connector if the antenna
is being used for receive diversity), as well as the following
characteristics:
• The total maximum gain, including cable loss, must not
exceed 4.15 dBi (if the antenna operates on the PCS band)
or 5.1 dBi (if the antenna operates only on the Cellular
band).
• The antenna must transmit and receive on the necessary
frequency bands in your coverage area. The MP 595
modem supports these RF bands:
· 1900 MHz (PCS)
· 800 MHz (Cellular)
You can use a dual-band antenna that supports both fre­
quencies. If your MP modem will only be connected to net­
works that use one of the bands, an appropriate single-
band antenna is sufficient. Contact your service provider
for information about radio bands used in your area.
For more information about antennas for your installation
contact your account manager.
GPS antennas
The GPS antenna connects to the MP modem using a male
SMA connector. Contact your account manager for more infor­
mation about compatible GPS antennas.
Antenna locations
When selecting locations for the RF and GPS antennas:
• Refer to the documentation provided with each antenna to
determine whether it requires a ground plane.
• Ensure that the RF antenna is mounted at least 20 cm
(8 inches) from vehicle occupants and bystanders.
• Ensure that all radio antennas (RF, GPS, CB radio, car
radio) are mounted at least 30 cm (12 inches) or more
apart.
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