Trimble Outdoors 5700 - Manual (Page 22)

1 Overview
6 5700 GPS Receiver User Guide
Op
eration
1.3
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 or limit its longevity.
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.
1.4
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.
Immediate access to satellite measurements and navigation results is
disabled when the receiver’s velocity is computed to be greater than
1000 knots, or its altitude is computed to be above 18,000 meters. The
receiver continuously resets until the COCOM situation is cleared.