S800A GNSS Receiver – User Manual
38
Unauthorized modification of the units voids already got approvals, the
warranty time and the operational licenses of the instrument.
UHF 410-470 MHz Data transceiver
General Antenna Installation Warning
1. All antenna installation and servicing is to be performed by qualified
technical personnel only. When servicing the antenna, or working at
distances closer than those listed below, ensure the transmitter has been
disabled.
2. Typically, the antenna connected to the transmitter is a directional (high
gain) antenna, fixed-mounted on the side or top of a building, or on a tower.
Depending upon the application and the gain of the antenna, the total
composite power could exceed 90 watts ERP. The antenna location should be
such that only qualified technical personnel can access it, and that under
normal operating conditions no other person can touch the antenna or
approach within 0.6 meters of the antenna.
You can see below a table showing the Antenna Gain versus Recommended
Safety Distance:
Antenna Gain
0-5 dBi
5-10 dBi
10-16.5 dBi
Minimum RF safety distance
0.6 meters
1.06 meters
2.3 meters
For USA: The FCC has adopted a safety standard for human exposure to
radio frequency electromagnetic energy. Proper use of this radio modem
results in exposure below government limits. The following precautions are
recommended:
DO NOT operate the transmitter when someone is located less than 20 cm
(7.8 inches) of the antenna.
DO NOT collocate (place within 20 cm) the radio antenna with any other
transmitting instruments.
DO NOT operate the transmitter unless all RF connectors are secure and any
open connectors are properly terminated.
