User Manual

Canopy 900 MHz AP and SM User Guide
Issue 1, Draft 1 June, 2004 Page 13 of 16
Leave the External Filters Delay parameter on the AP Configuration page (see Figure 2: Highlights of 900
MHz AP Configuration Page at the factory default of 0 Nanoseconds, regardless of whether you have filters
installed. (The External Filter Delay was included in the user interface in case it was needed, but turns out
to never be needed – leave it set to 0.)
Important! To remain within the legal regulatory limits for antenna output power, you must not set the
Antenna Gain parameter lower than the actual gain of your antenna. If you have a 10 dBi antenna, do not
enter an Antenna Gain of 8 or 9. This parameter must be set equal to or higher than the actual gain of your
antenna to remain within the legal regulatory limits for antenna output power.
The parameter has a range from 8 dBi to 32 dBi. When set to 8 dBi, the radio will have a power-out of 28
dBm to generate the legal maximum EIRP of 36 dBm (4 W). When set to 32 dBi, the radio will have a
power-out of 4 dBm to again generate the legal maximum EIRP of 36 dBm (4 W).
Note! In some circumstances, it may be advantageous to set the parameter higher than the actual gain of
your antenna. This reduces the power (and range) of the link, and may be useful to control RF emissions
and reduce multi-pathing and jitter in some situations.
Important! When using connectorized antennas, the connector can be a point of failure over time due
to water egress. Accepted industry practices should be used to apply sealant and wrap the connector to
prevent water egress.
The male and female N-type connectors form a gas tight seal with each other, but the point where the cable
enters each connector can be a point for water egress, with eventual corrosion and failure of the connection.
Sealing and wrapping is critical to long-term reliability of the connection.
2.7 Spectrum Analyzer
Description
The Canopy 900 MHz SM provides a spectrum analyzer much like 2.4, 5.2, and 5.7 GHz SMs, as shown in
Figure 5: 900 MHz SM Spectrum Analyzer. Due to the heavy general use of the 900 MHz spectrum, it is
advisable to use the SM’s built-in spectrum analyzer or other equipment to confirm the RF environment
both at AP and at SM locations during site surveys.
Operation
On the SM, click on Expanded Stats, then on Spectrum Analyzer. Click Enable several times to scan and
collect data, then click Disable to return the SM to normal mode.