User Manual

SNB900 Radio Modem User Guide 19
Configuration and Installation 3
The repeater should now be in operation. When the repeater
receives data broadcast from the base, RPT (Repeat) flashes in
the top right corner of the SNB900 display.
30.1 Installing antennas
Safety
You must maintain a minimum separation distance of 20 cm
(approximately 8 in) between yourself and the radiating antenna for
this device to satisfy the RF Exposure requirements of the FCC. For
mobile operation, the maximum gain of the antenna must not exceed 0
dBi.
Height
When installing and locating antennas, place them as high as legally
possible above the ground and surrounding obstructions, such as trees,
vehicles, buildings, and hills.
Note – Antenna height is the most important factor in achieving
maximum range with radio modems. Doubling the antenna height
results in a 40% increase in line-of-sight range. Use low loss cable if
you have to increase the length of the antenna cable to accommodate
your installation. Consult your license for the legal limits on antenna
height.
Line-of-sight obstructions
If you place an antenna near an object, especially a metal object, you
can severely limit its efficiency. When an antenna is mounted on an
antenna mast, try to make sure that the radiating element of the
antenna is above any possible obstruction.