User Manual

1: Introduction
APCD-LM047-1.1 5
• Power Supply on page 6
1.3.2 EUM3005 Active Diversity Indoor Antenna
The EUM3005 Active Diversity Indoor Antenna uses switched-beam diversity. This antenna,
shown in Figure 2, performs very well in cases where the radio path to the CCU is obstructed
and/or where there is significant multipath. The antenna comes with a mounting bracket and is
designed to mount vertically on walls (using drywall screws), or horizontally (on desks, for
example, using the suction cups). The concave surface of the antenna is the front.
Figure 2 WaveRider Indoor Antenna with Switched-beam Diversity
The EUM3005 Active Diversity Indoor Antenna contains two vertical antenna elements
mounted inside and on either side of the antenna housing. The phasing between these
elements, which modifies the antenna pattern, is controlled by a DC voltage from the
EUM3005. It produces two patterns, one perpendicular to the face of the antenna, which has a
gain of about 6 dBi (not including cable loss), and the other, a dual-beam pattern off both
sides, offering about 3 dBi gain for each beam. These beam patterns are illustrated in Figure
3.
The EUM3005 samples the signal strength from both antenna patterns during the preamble of
every received packet and automatically selects the best signal. When the EUM3005
transmits, it sends on the antenna pattern that was last used to receive a signal. Since most of
the traffic comes from the CCU, the EUM3005 samples the signal strength often—typically
faster than once every 5 ms.
Antenna
Front