User's Manual

SPSx50 Modular GPS Receiver User Guide 39
Setup Guidelines 4
– Alternators and generators
– Electric motors
–Equipment with DC-to-AC converters
– Fluorescent lights
–Switching power supplies
• Trimble recommends that wherever possible all GPS receiver equipment is
protected from rain or water ingress. The receivers are designed to withstand all
wet weather conditions, however keeping the receivers dry prolongs the life of
the equipment and reduces the effects of corrosion on ports and connectors. If
the equipment does get wet, dry the equipment with a dry cloth, and leave the
equipment open to the air to dry. Do not lock wet equipment in a transport case
for prolonged periods. Avoid exposing the GPS receiver to corrosive liquids and
salt water wherever possible.
• When using the rover receiver in open spaces, Trimble recommends that you
stop work during electrical storms where the risk of lightning strike is high.
• Where cables are involved, Trimble recommends that you use cable ties to
secure the cables to the rod or other equipment to avoid inadvertent snagging
while moving about the jobsite. Be careful not to kink, twist, or unnecessarily
extend cables, and avoid trapping them in car doors or windows. Damage to
cables can reduce the performance of GPS equipment.
Internal radio setup for rover operations
The internal radio of the SPS GPS receiver is delivered with the TX radio frequencies
preprogrammed into the receiver. To add more RX radio frequencies, use the WinFlash
utility (see Appendix C, Adding Internal Radio Frequencies).
Once the radio frequencies are configured, use the SCS900 software to select channel
frequencies during base station or rover setup operations.
For more information, refer to the the WinFlash Help, or the SCS900 User Guide.
External radio setup
To use an external radio with the SPS770 GPS receiver, you need an external power
source for the radio.
To set up the receiver using an external radio:
1. Connect one end of the yellow GPS antenna cable to the yellow TNC port on the
receiver.
2. Connect the other end of the GPS antenna cable to a Zephyr or Zephyr Geodetic
antenna.
3. Connect the external radio to Port 3 on the receiver.