User's Manual

13 Setting up the Receiver
110 Trimble R7/R8 GPS Receiver User Guide
Trimble R8 GPS Receiver Operation
Each port or connector on the Trimble R8 receiver is marked with an
icon to indicate its main function, as shown in Table 13.1.
Port 1 is a 7-pin 0-shell Lemo connector that supports RS-232 comms
and external power input. Port 1 has no power outputs.
Port 2 is a DB-9 male connector that allows for full 9-pin RS-232
comms. Port 2 does not support power in or out. For more information,
see Chapter 18, Default Settings and Chapter 19, Cables and
Connectors.
The TNC connector is for connecting a radio antenna to the Trimble R8
internal radio. A whip “rubber duck” antenna is supplied with the
system for units with internal UHF or 900 MHz radios. This connector
is not used if you are using an external UHF radio or GSM.
External UHF or GSM antenna
Depending on which module you have purchased, use this TNC
connection for an external antenna to enhance the UHF or GSM.
The UHF antenna is approximately 16.5 cm (6.5 inches) long, and
round. The GSM antenna is approximately 16.5 cm (6.5 inches), and
flatter than the UHF antenna. Make sure that you use the correct
antenna or the signal will be degraded.
For more information on connecting the Trimble R8 receiver, see the
following sections in this chapter.
Table 13.1 Trimble R8 receiver ports
Icon Name Connections
Port 1 Device, computer, external radio, power in
Port 2 Device, computer, external radio
RADIO Radio communications antenna