Major Subsystems And Their Functions; Introduction; Description; Unit Major Components - Advantech AWMT Installation And Operation Manual

Hub-mount solid state transceivers

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4. MAJOR SUBSYSTEMS AND THEIR FUNCTIONS

This Section describes how the hub-mount (outdoors) solid state transceiver functions.

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.

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.

AWMT

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