User's Manual

4 Setup Guidelines

40 SPSx50 Modular GPS Receiver User Guide

4. Connect a radio antenna to the external radio as shown in the following figure..

Figure 4.2 Connecting an external radio

5. Connect an external power source to Port 2 on the receiver.

Note – 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.

Cellular modem and external radio

Instead of the internal radio, you can use a cellular modem or an external radio as your

data communications link.

To connect a cellular modem to an SPSx80 Smart GPS antenna, you need the following:

• SPSx80 Smart GPS antenna.

• One of the following:

– TSC2 controller with CompactFlash card cellular modem, for example, a

Audiovox modem card

– Cellular modem or a cellphone that can transmit data

• Serial (cellphone to DB9) cable (supplied with the cellular modem or phone).

• Port 2 of the SPSx80 supports full RS-232 protocol, and should function properly

with most cellular phone cables. Some cellular units may require custom

cabling.

Alternatively, the receiver also supports a cable-free Bluetooth connection with

Bluetooth enabled cell phones.

For more information on using a cellular modem as a data link, refer to the SCS900 User

Guide.

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SPS770