Advantech AWMT, Installation And Operation Manual

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AWMT
11
4. MAJOR SUBSYSTEMS AND THEIR FUNCTIONS
4.1 INTRODUCTION
This Section describes how the hub-mount (outdoors) solid state transceiver functions.
4.2 DESCRIPTION
The AWMT is an outdoor unit intended for mounting near the hub of an antenna (see
Figure 1 at
page 12 and Figure 2 at page 13). The unit incorporates a weather resistant enclosure that houses
several electronic modules and a cooling system that protects the electronic components from
overheating. For low power models, the cooling system consists of conduction from the module
enclosure to the case. For high power models, the cooling system is forced-air, using one or more
cooling fans.
Built-in monitoring and control features indicate the current status of the AWMT and provide
fault detection and protection when operating outside its normal operating conditions. The
AWMT also allows the user access to the monitoring and control functions by using a discrete
interface, the RS-232 serial interface or the RS-485 serial interface.
A functional block diagram of a single unit is shown in
Figure 3 at page 14.
The AWMT can be combined with a second unit to form a 1:1 redundant system. A redundancy
kit by ADVANTECH AMT
™
is available as an option.
4.3 UNIT MAJOR COMPONENTS
The AWMT transceiver consists of the following major components:
•
IF to L-Band Up-Converter Module,
•
L-Band to RF Up-Converter Module,
•
Power Amplifier Module,
•
L-Band to IF Down-Converter Module,
•
RF-Band Low Noise Block
•
Waveguide Assembly,
•
10 MHz Reference Oscillator,
•
Main Controller Board,
•
Power Supply,
•
Current Sensor, and
•
Power Monitor Board.
These components are interconnected using dedicated wiring harnesses and coaxial cables. To
clarify the explanation of the components in the following paragraphs, refer to the block diagram
in
Figure 3 at page 14.