Senao Co SL-2011CD-ANT Users Manual

SL-2011CD-GP SL-2011CD-FP

SL-2011CD-DP

Antenna User Guide

Before operating the unit, please read this manual thoroughly,
and retain it for future reference.

1

Installing the Antenna

1. Introduction
The Senao access point is designed to perform in a variety of

environments. Implementing the antenna system can greatly improve
coverage and performance. A good communication can only be
achieved with the right antenna. The antenna kits com prise numerous
components, including the antenna, connectors, mounting hardware,
antenna cabling, and in certain product boxes.

2. Type of Antennas
The Senao access point may be bundled with several different

styles of antennas f or use in the 2.4GHz ra nge. Each type of antenna
will offer different coverage capabilities. As the gain of an antenna
increases, there is some tradeoff to its coverage area. Us ually high gain
antennas offer longer cover age d istances, but onl y in a certain direc tion.
The radiation patterns bel ow show the coverage area s of the styles of
omni-directional and uni-directional antennas.

◆Omni-Directional Antennas
An omni-directio na l a nte nn a is designed to pr ov id e a 360- de gree

radiation pattern. This type of antenna is used when coverag e in all
directions from the antenna is required.

Figure 1-1: Omni-Directional Antenna (top-view)

◆Directional Flat Panel Antennas
Directional antenn as have many different st yles and shapes. By

redirecting this energ y, it has the effect of providing more energy in
one direction, and less ene rgy in all other dir ections. As the gain of a
directional antenna increases, the angle of radiation usually
decreases, providing a gr eater coverage distanc e, but with a r educed
coverage angle.

2

IMPORTANT NOTE:
FCC RF Radiation Exposure Statement:
This equipment complies with FCC RF radiation exposure limits set forth
for an uncontrolled environment. This equipment should be installed and
operated with a minimum distance of 20 centimeters between the
radiator and your body.
This transmitter must not be co-located or operating in conjunction with
any other antenna or transmitter.

Figure 1-2: Directional Flat Panel Antenna (side view)

3. Antenna placement
The advices below are basic concepts to install an antenna.

 The distance between the ante nna and transce iver should be

kept to a minimum to reduce signal loss.

 To operate at optimum efficiency, antenna cable should be

kept as short as possible.

3

4

4. Installing the 3dBi omni-directional antenna

4-1. Hardware Description

The 3dBi omni-directional antenna is a broadband antenna for the

2.4GHz frequency band featuring an omni-directional pattern with a
normal gain of 3dBi. Before you start installing the antenna, verify the
following items in the antenna kits or in the product package.

◆ Elements list (Figure 1-3)
Element Description Quantity Item

Omni-directional Antenna 1 A
Ferrules 1 B
Nut 2 C
Screw (Long) 3 D
Screw (medium) 2 E
Screw (short) 1 F
Lock-washers 5 G
Bracket 1 H
Cable 1 I
Jack 1 J

5

Figure 1-3 Elements list

4-2. Mounting the Omni-directional Antenna

You can mount the 3dBi antenna to a ceiling for indoor use. This
antenna uses vertical polarization that is the most common type of
polarization for omni-directional antennas.

◆ Mounting to a ceiling

In most cases, these installations require a large coverage area.
Experience has shown that an omni-directional antenna mounting at
about 6 to 8 m eter (20 to 26 feet) will typicall y provide the best overall
coverage. Of cours e this also depends upon the height of the ceiling ,
material on the cei ling and ability to locate the antenna at this height.
The antenna should be placed in the center of the desired coverage
area. An open area will provide the best performance.

To mount the antenna to a ceiling proceed following steps：

1. Position the fer rule (item B in Figure 2-11) to the front of the brack et

(item H).

2. Place antenna m ounting scr ews (item F) through the s crew hole on

the bracket.

3. Use the lock – washers (item G) and nuts (item C) to secure the

bracket to the ferrule (item B).
Use a wrench to tight en t he nuts a nd ens ure t he ferrule will be f ixed