User's Manual

Powerwave Fiber Optics
VM100 56/EN – User’s Manual Rev. P1A9-Draft 2004-11 1 - 3
Human Exposure of RF Radiation
This section contains a few words about repeater antennas and prescriptions for
installaton and maintenance of antenna systems. Also, it describes how to calculate
safety distances needed for RF radiation at different antenna power and frequencies.
Repeater Antennas
To be able to receive and transmit signals as described in the first bulleted paragraph on
page 1-1, a repeater is connected to a donor antenna directed towards the base station,
and a service antenna directed towards the coverage area. A fiber optic cable from the
base station might, however, be substituted for the donor antenna.
Installation and Maintenance of Antenna Systems
Installation and maintenance of all repeater antenna systems must be performed with
respect to the radiation exposure limits for public areas.
The antenna radiation level is affected by the repeater output power, the antenna gain,
and by transmission devices such as cables, connectors, splitters and feeders.
Have also in mind that the system minimum coupling loss, typical between 25dB and
35dB, is determined by a standard with the purpose to protect base stations from noise
and other performance dropping effects.