Trimble Outdoors SPSX51 - Manual (Page 36)

4 Setup Guidelines
34 SPSx51 Modular GPS Receivers User Guide
Cell phone towers can interfere with the base station radio broadcast and can
stop corrections from reaching the rover receiver. High-power signals from a
nearby radio or radar transmitter can overwhelm the receiver circuits. This does
not harm the receiver, but can prevent the receiver electronics from functioning
correctly.
Low-power transmitters, such as those in cell phones and two-way radios, do
not interfere with receiver operations.
• Do not set up the base station 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
• Place the GPS receivers in a protected and secure location. If the base station is
in the center of a jobsite where heavy machinery is operating, place flags around
the base station to warn operators of its existence.
• If you place the SPSx51 Modular GPS receiver in a lock box on the jobsite to
protect the receiver from theft or from the weather, shield the lock box from
direct sunlight and provide ventilation for the receiver through an inlet and
extractor fan. A receiver that has a broadcast radio generates significant heat.
Do not allow the temperature in the box to exceed 50 ºC (122 ºF).
If working in a cold climate, you may need to provide heat to the receiver. Do not
operate the receiver below –40 ºC (–40 ºF).
• Trimble recommends that, wherever possible, you keep GPS receiver equipment
dry. The receivers are designed to withstand wet weather, but keeping them dry
prolongs their life 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. Avoid exposing the GPS receiver to
corrosive liquids and salt water wherever possible.