User's Manual

CHAPTER 8
ANTENNA SETUPS
Revised: 2 Jul 08 8-4 EST P/N AA107G
ANTENNA DIVERSITY
The dual diversity antenna configuration on the ESTeem Model 195Eg allows the radio to operate more efficiently in areas with
high reflections (such as indoors or in a city) and without direct line of sight (LOS) between the antennas. One of the most difficult
conditions to control in a radio system is the effect of a destructive reflected radio signal called mutipathing. Multipathing occurs
when waves emitted by the transmitter travel along a different path and interfere destructively with waves traveling on a direct line-
of-site path. The phenomenon occurs because waves traveling along different paths may be completely out of phase when they
reach the antenna, thereby canceling each other out. The dual diversity antenna configuration places a physical distance between the
antennas where one reflected signal will be out of phase, but the second will be not. The ESTeem Model 195Eg will sample both
antennas and select the best receive signal.
ANTENNA PORT SELECTION
The antenna ports on the Model 195Eg must be configured for either a single receive antenna (external mount antennas) or dual
diversity antenna setup. To access the port configuration open ESTeem Web page using your computer’s Web Browser as per
instructions in Chapter 4. Select Advanced from the menu items and Radio Settings-wlan0 device (Figure 1).
Figure 1: Advanced Settings Menu