User's Manual

Provisioning
40 SkyZhone 45 Installation Guide
DR
A
FT
of interference for the specific azimuth and deployment. Seventeen
overlapping channels are available for each of the A and B type systems.
Provisioning the secondary frequency
The secondary frequency is used as a backup if the primary channel become
unusable due to interference. Before choosing this frequency, perform an
interference analysis using a spectrum analyzer. The channel should be clear
of interference for the specific azimuth and deployment. Choose one of the
seventeen channels in the channel plan.
Provisioning transmitter power
Transmitter power is regulated by controlling the value of an attenuator in the
transmit portion of the ODU. There are 32 values from 00 (minimum) to 1F
(maximum). Each HEX step changes the attenuation by 1 dB. The default
system transmit attenuation is 15 dB.
Provisioning the receive attenuator setting
The receive attenuator controls the signal level to the receiver input. Most
systems operating over path lengths greater than one mile will require no
extra attenuation in the receive path. Some installations, including those with
large antennas, may require additional receive attenuation. There are 16
values from 00 (minimum) to 1F (maximum). Each HEX step changes the
attenuation by 2 dB. The default receive attenuation is 0 dB.
Provisioning the transmit overlimit regulator
The SkyZhone 45 is equipped with a detector that monitors the actual transmit
output level after the transmitter power amplifier. This enables the system to
detect saturation of the power amplifier, which could cause the transmitter to
exceed FCC maximum emission levels. If the ODU CPU detects the
transmitter exceeding this level, the transmitter power amplifier will be shut
down. There are three HEX settings for this detector that depend upon the
antenna size.
Enabling the RF power amplifier and LNA
This step in the provisioning initiates the RF transmission. The RF power
amplifier and receive Low Noise Amplifier (LNA) are controlled by this
command. Do not enable these amplifiers until the system is fully installed,
the antennas are properly positioned, and there are no people in front of the
radiating area of the antenna.