Sierra Wireless MP 555, Installation Manual

Page: 19 / 36

Installing the MP 555 GPS Modem in a Vehicle
Note: Tighten cables connected
Antennas
to the MP 555 GPS by hand. Do
not use tools.
SMA
TNC
Figure 2-8: The MP 555 GPS’s SMA connector
for the GPS antenna, and the TNC connector
for the CDMA RF antenna.
The MP 555 GPS requires a CDMA
RF antenna to connect to the CDMA
wireless network. If the built-in GPS
module is used, it requires a
dedicated GPS antenna, or a combi­
nation antenna with cables for both
antenna connectors on the modem.
CDMA RF Antennas
The MP 555 GPS requires an approved CDMA RF (Radio
Frequency) antenna. The antenna must have 50 ohms
impedance and a cable with a male TNC connector, as well as
the following characteristics:
• The total maximum gain, including the cable loss, must
not exceed 5.2 dBi (if the antenna operates on the PCS
band) or 6 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 555 GPS
supports these RF bands:
· 1900 MHz (PCS)
· 800 MHz (Cellular)
A dual-band antenna that supports both frequencies can be
used. If your MP 555 GPS 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 at your reseller or at Sierra
Wireless.
GPS Antennas
If you are installing a GPS antenna, it connects to the
MP 555 GPS modem using a male SMA connector. Contact
your account manager at your reseller or at Sierra Wireless for
more information about compatible GPS antennas.
Rev 2.1 Jan.05 19