User's Manual

Installation 2-16
DataNex EMS Wireless, DATA-20 Digital Radio
2.11 Antenna/Feed System
2.11.1 Antenna Installation
For compliance with FCC RF Exposure requirements the following has to be adhered to:-
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 noted below,
ensure the transmitter has be 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 20 to
61watts EIRP. The antenna location should be such that only qualified technical
personnel can access it, and that under normal operating conditions the antenna
separation from the user is required to be located at the distance of 3.5meters or more.
EIRP at the antenna is calculated as follows:-
Transmit power – Cable loss + Antenna Gain = EIRP
Eg.
+31.1dBm – 6dB(for 100m LDF5-50A) +36dBi = 61.1Bmi