Antennas - ProSoft RadioLinx RLXIB-IESC User Manual

RLXIB-IESC ♦ 802.11a, b, g
RadioLinx® Industrial 802.11abg Serial and Ethernet Client
6.2.3 Ethernet Cable Configuration
Note: The standard connector view shown is color-coded for a straight-through cable.
Crossover cable
RJ-45 PIN
1 Rx+
2 Rx-
3 Tx+
6 Tx-
6.3

Antennas

When you are ready to connect antennas to the radio, see Connecting antennas
(page 24).
You must also consider three important electrical characteristics when selecting
antennas:

Antenna pattern (page 84)

Antenna gain (page 85)

Antenna polarity (page 85)

Antenna location, spacing, and mounting (page 90)
6.3.1 Antenna Pattern
Information between two wireless devices is transferred via electromagnetic
energy radiated by one antenna and received by another. The radiated power of
most antennas is not uniform in all directions and has varying intensities. The
radiated power in various directions is called the pattern of the antenna. Each
antenna should be mounted so that its direction of strongest radiation intensity
points toward the other antenna or antennas with which it will exchange signals.
Complete antenna patterns are three-dimensional, although often only a two-
dimensional slice of the pattern is shown when all the antennas of interest are
located in roughly the same horizontal plane, along the ground rather than above
or below one another.
A slice taken in a horizontal plane through the center (or looking down on the
pattern) is called the azimuth pattern. A view from the side reveals a vertical
plane slice called the elevation pattern.
Page 84 of 98
RJ-45 PIN
3 Tx+
6 Tx-
1 Rx+
2 Rx-
Straight- through cable
RJ-45 PIN RJ-45 PIN
1 Rx+ 1 Tx+
2 Rx- 2 Tx-
3 Tx+ 3 Rx+
6 Tx- 6 Rx-
ProSoft Technology, Inc.
May 25, 2010
Reference
User Manual