TB7100 Service Manual Functional Description 19© Tait Electronics Limited October 20053 Functional DescriptionThis section describes some principles of the base station operation.The descriptions are based on a 25W base station.Figure 3.1 below shows the high-level block diagram of the base station.It illustrates the main inputs and outputs for power, RF and control signals,as well as the interconnection between modules.■ program data and audio from the P ROG /M IC socket on the UI board to andfrom the transmitter and receiver modules■ audio and signalling from the S YSTEM connector to and from thetransmitter and receiver modules■ RS-232 data from the serial data connector (IOIOI) to and from thetransmitter and receiver modules■ fan power and control from the SI board■ power distribution from the DC power input connector to thetransmitter and receiver modules, and from the receiver module to theUI board.The circuitry of the individual modules that make up the base station isdescribed in more detail in the following sections.Figure 3.1 Base station high-level block diagramReceiverModuleTransmitterModuleFrontPanel/UI BoardSI BoardFansDC Power connectorSystem Interface connectorSerial Data connectorRx (RF Port)Tx/ANT (RF Port)Internal PowerUI/RxUI/TxRx/SITX/SIPROG/MICconnectorFan ControlTemp.SensorFusedInternalPower
