Trimble Outdoors 5700/5800 - Manual (Page 19)

5700/5800 GPS Receiver User Guide 7
Overview 2
5700 GPS Receiver Oper
ation
• Three RS-232 serial ports for:
– NMEA output
– RTCM SC-104 input and output
– Trimble Format (CMR) input and output
• Two TNC ports for connecting to the GPS and radio antennas
2.2
Use and Care
The 5700 receiver is designed to withstand the rough treatment that
typically occurs in the field. However, the receiver is a high-precision
electronic instrument and should be treated with reasonable care.
C
WARNING – Operating or storing the 5700 receiver outside the specified
temperature range can damage it. For more information, see Physical
specifications, page 74.
High-power signals from a nearby radio or radar transmitter can
overwhelm the receiver circuits. This does not harm the instrument,
but it can prevent the receiver electronics from functioning correctly.
Avoid using the receiver within 400 meters of powerful radar, television,
or other transmitters. Low-power transmitters such as those used in
cellphones and two-way radios normally do not interfere with 5700
receiver operations.
For more information, see the Trimble technical note Using Radio
Communication Systems with GPS Surveying Receivers.
2.3
COCOM Limits
The U.S. Department of Commerce requires that all exportable GPS
products contain performance limitations so that they cannot be used
in a manner that could threaten the security of the United States. The
following limitations are implemented on the 5700 receiver.