User's Manual

Chapter 1: Working with the ER-1000
TR0190 Rev. A1 11
TR-900V-120-13 Vertical Sector
Table 2 Supported Accessory antennas
1.3 Deployment Considerations
The TR-900’s radio operates in either the 2.4 GHz or the 5.8 GHz ISM band, depending on the
model. It is possible that there will be other devices operating in these bands that will interfere
with the TR-900’s radio. Interference from adjacent TR-900s can also degrade performance if
the TR-900s are not configured properly.
It is advisable to carry out a site survey prior to installation to determine what devices are
operating in the band that your TR-900 uses. To detect the presence of other 802.11 devices,
a tool such as Netstumbler (http://www.netstumbler.com/downloads/) can be used. A spectrum
analyzer can be used for further characterization of interference in the band.
1.3.1 AP Channel Selection
A site survey should be conducted to determine which access point channel will provide the
best performance. Some of the 802.11b/g channels that the TR-900HG’s radio can be
configured to use are overlapping. Only channels 1, 6, and 11 are non-overlapping.