User's Manual
Table Of Contents
- Your Feedback Please
- How to Contact Us
- ProSoft Technology® Product Documentation
- Important Safety Information
- Recommended Antennas
- Antenna spacing requirements for user safety
- 1 Start Here
- 2 RLX2 Quick Setup
- 3 Planning the Network
- 4 Installing the Radios
- 5 Diagnostics and Troubleshooting
- 6 Detailed Radio Configuration / Diagnostics
- 7 RadioLinx Industrial Hotspot Browser
- 8 Reference
- 8.1 Product Overview
- 8.2 Compatibility with ProSoft RLXIB Series Radios
- 8.3 Dimensional Drawings
- Master Channel-Frequency Table
- 8.4 FCC Emission Regulations
- 8.5 Radio hardware
- 8.6 RLX2-IHA Detailed Specifications
- 8.7 RLX2-IHG Detailed Specifications
- 8.8 RLX2-IHNF Detailed Specifications
- 8.9 RLX2-IHW Detailed Specifications
- 9 Antenna Configuration
- 10 Support, Service & Warranty
- Glossary of Terms
- 802.11
- 802.11a
- 802.11b
- 802.11g
- 802.11i
- 802.11n
- Access Point
- Ad hoc Mode
- AES
- Amplifier
- Antenna
- ASCII
- Association
- Authenticate
- Authentication Server
- Band
- Bandwidth
- Base Station
- Baud Rate
- bps
- CACT
- Channel
- Channel Move Time
- Client, Radio Mode
- Client, Software
- Configuration PC
- dBi
- dBm
- DCE
- Decibel (dB)
- Default Gateway
- Device-to-Device Network (Peer-to-Peer Network)
- DFS
- DHCP
- Direct Sequence Spread Spectrum
- Directional Antenna
- Diversity Antenna
- DTE
- Dual Band
- EAP
- EIRP
- Encryption
- ESD
- ESSID
- Firmware
- Frequency Hopping
- Frequency Hopping Spread Spectrum
- Fresnel Zone
- Full-Duplex
- Gain
- Gateway
- Guard Interval (GI)
- Half-Duplex
- Hz
- IEEE
- IP Address
- Key
- LAN
- LED
- Line of Sight (LoS)
- Link point
- MAC ID
- Master device
- Mbps
- Megahertz
- MIC
- MIMO
- Modbus
- Modem
- Network
- Node
- Non-Occupancy Period
- Null Modem Cable
- Panel Antenna
- Parabolic Antenna
- Peer-to-Peer Network
- Point-Multipoint (Broadcast) Network
- Point-Multipoint (Modbus) Network
- Point-to-Multipoint
- Point-to-Point Network
- Poll
- Power Supply
- Protocol
- QoS
- Range
- Remote Access Point
- Remote device
- Repeater
- Repeater, Radio Mode
- RS-232
- RTU (Remote Terminal Unit)
- Sector Antenna
- Signal Diversity
- Signal Loss
- Signal Strength
- Simplex
- Site Survey
- Spectrum
- Spread Spectrum
- SSI
- Subnet Mask
- TKIP
- UART
- WAP
- WDS
- WEP
- Wi-Fi
- Wi-Fi CERTIFIED™
- Wi-Fi Interoperability Certificate
- Wi-Fi Protected Setup
- Wireless Gateway
- Wireless Network
- WLAN
- WPA
- WPA2
- Yagi Antenna
- Index
Antenna Configuration RLX2 Series ♦ 802.11a, b, g, n
User Manual Industrial Hotspot
9.1.2 Antenna Gain
Antenna gain is a measure of how strongly an antenna radiates in its direction of
maximum radiation intensity compared to how strong the radiation would be if the
same power were applied to an antenna that radiated all of its power equally in
all directions. Using the antenna pattern, the gain is the distance to the furthest
point on the pattern from the origin. For an omnidirectional pattern, the gain is 1,
or equivalently 0 dB. The higher the antenna gain is, the narrower the
beamwidth, and vice versa.
The amount of power received by the receiving antenna is proportional to the
transmitter power multiplied by the transmit antenna gain, multiplied by the
receiving antenna gain. Therefore, the antenna gains and transmitting power can
be traded off. For example, doubling one antenna gain has the same effect as
doubling the transmitting power. Doubling both antenna gains has the same
effect as quadrupling the transmitting power.
9.1.3 Antenna Polarity
Antenna polarization refers to the direction in which the electromagnetic field
lines point as energy radiates away from the antenna. In general, the polarization
is elliptical. The simplest and most common form of this elliptical polarization is a
straight line, or linear polarization. Of the transmitted power that reaches the
receiving antenna, only the portion that has the same polarization as the
receiving antenna polarization is actually received. For example, if the
transmitting antenna polarization is pointed in the vertical direction (vertical
polarization, for short), and the receiving antenna also has vertical polarization,
the maximum amount of power possible will be received. On the other hand, if
the transmit antenna has vertical polarization and the receiving antenna has
horizontal polarization, no power should be received. If the two antennas have
linear polarizations oriented at 45° to each other, half of the possible maximum
power will be received.
9.1.4 Whip antennas
Use a 1/2 wave straight whip or 1/2 wave articulating whip (2 dBi) antenna with
RLX2 radios. These antennas are the most common type in use today. Such
antennas are approximately 5 inches long, and are likely to be connected to a
client radio (connected directly to the radio enclosure). These antennas do not
require a ground plane. Articulating antennas and non-articulating antennas work
in the same way. An articulating antenna bends at the connection.
Page 136 of 161 ProSoft Technology, Inc.
November 29, 2012