User's Manual

3 Setting up the Receiver
32 Trimble R7/R8 GPS Receiver User Guide
Trimble R7 GPS Receiver Operation
Figure 3.12 Connecting an external radio
5. Connect an external power source to Port 2 on the receiver.
External rover radios must have their own power source
because the internal Lithium-ion batteries do not supply enough
voltage. Alternatively, supply external power to port 2 of the
receiver, and enable power out on port 3.
Base radios must have their own power source because of their
high power consumption.
Alternatively, you can apply external power directly to the radio,
if it supports it.
You can use a 10 Ah battery, a 6 Ah battery, or camcorder
batteries. The choice of power supply depends on the
application, and whether you are using the radio as a reference
To antenna
To power supply