Sierra Wireless MP 875 - Manual (Page 29)

Hardware and Software Installation
Rev 1.5 Jul.08 29
You can also use a ground screw on the connector panel of the
MP modem. Use a 16‐gauge wire if you choose to use a ground
screw. A ground screw is not required as long as the power
harness is properly grounded.
Figure 3-4: The ground screw connector on the connector panel.
Note: Tighten cables connected
to the MP modem by hand. Do
not use tools.
Step 2 — Mount the antennas and install
the cables
The MP 875 modem has one Main RF antenna connector and
one GPS antenna connector. The MP 595W has an additional
RF antenna connector for an AP antenna. The MP modem
requires an RF antenna to connect to the wireless network.
The built‐in GPS module requires a dedicated GPS antenna or
a combination antenna with cables to both the Main RF and
GPS antenna connectors on the MP modem.
If you already have an MP modem combination GPS antenna,
you can re‐use it with your new MP modem. This antenna has
two leads — one for Main RF (TNC connector) and one for GPS
(SMA connector).
Main RF antenna
Use an approved Main RF antenna to connect to the wireless
network. The antenna must have 50 ohms impedance and a
cable with a TNC connector, as well as the following character‐
istics:
• The total maximum gain, including cable loss, must not
exceed 4 dBi (if the antenna operates on the PCS band) or
5 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 modem
supports these RF bands:
· HSUPA and UMTS networks:
· 850 MHz
· 1900 MHz
If you are using a ground screw,
Power
I/O
insert it here.