Trimble SPSX51 User Manual

SPSx51 Modular GPS Receivers User Guide     

Setup Guidelines     

Do not locate the receiver or antenna within 400 meters (about 1,300 ft) of 
powerful radar, television, cellular communications tower, or other transmitters 
or GPS antennas. Low-power transmitters, such as those in cellular phones and 
two-way radios, normally do not interfere with receiver operations. Cellular 
communication towers can interfere with the radio and can interfere with GPS 
signals entering the receiver. This does not harm the receiver, but it can prevent 
the receiver electronics from functioning correctly.

Do not use the rover receiver directly beneath or close to overhead power lines 
or electrical generation facilities. The electromagnetic fields associated with 
these utilities can interfere with GPS receiver operation. Other sources of 
electromagnetic interference include:

–

gasoline engines (spark plugs)

–

televisions and computer monitors

–

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. Although, the receivers are designed to withstand 
all wet weather conditions, keeping the receivers dry prolongs the life of the 
equipment and reduces the effects of corrosion on ports and connectors. If the 
equipment gets wet, use a clean dry cloth to dry the equipment and then leave 
the equipment open to the air to dry. Do not lock wet equipment in a transport 
case for prolonged periods. Wherever possible, avoid exposing the GPS receiver 
to corrosive liquids and salt water.

If you are 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 vehicle doors or windows. Damage to 
cables can reduce the performance of GPS equipment.

The internal radio of the SPS GPS receiver is delivered with the transmit (Tx) radio 
frequencies preprogrammed into the receiver. To add receive (Rx) radio frequencies to 
450 MHz radios, use the WinFlash utility or web interface (see 

). Network channels can be selected for the 900 MHz 

radios.