Tait TBAB1A Base Station Tranceiver User Manual Exhibit D Users Manual per 2 1033 c3

Tait Limited Base Station Tranceiver Exhibit D Users Manual per 2 1033 c3

Exhibit D Users Manual per 2 1033 c3

TB8100 Installation and Operation Manual Appendix 1: 12V PA i© Tait Electronics Limited December 2004Appendix 1: 12V PABoost Regulator Circuit DescriptionThis section provides a brief description of the circuitry on the boost regulator board. Figure 1.1 below shows the configuration for a 5W or 50W PA, along with the main inputs and outputs for power, RF and control signals. Note that the 60W board is only fitted to the 50W PA. The circuit description for the rest of the PA is provided in the “Circuit Description” chapter.The boost regulator board accepts an input of 12VDC nominal. The input is firstly fed through the DC input filter, and is then fed through an output filter to provide the 12VDC (nominal) output for the reciter. The output from the DC input filter is also fed to the power stage where the voltage is boosted to 28VDC, and is then fed through an output filter to provide the 28VDC output for the PA circuit boards. The battery control circuitry monitors the DC input voltage from the battery. Protection is provided against the wrong input voltage being supplied. The battery control circuitry also prevents deep discharge of the battery.Figure 1.1 5W or 50W PA high level block diagram6WBoardControl BoardBoost Regulator60WBoardAmbient AirTemperatureSensorBoardLow-PassFilter&DirectionalCouplerBoardRF I/P +PA Key RF O/P12VDCI/P12VDC O/P(Reciter)DC28VDC28VDCRF RFControl &MonitorControl &MonitorControl &MonitorSystemControlBus
ii Appendix 1: 12V PA TB8100 Installation and Operation Manual© Tait Electronics Limited December 2004Overview of Inputs and OutputsThis section identifies the main input and output connections for the TB8100 BSS with 12V PA. Figure 1.2 below identifies the connections at the front of the base station, and Figure 1.3 on page iii identifies those at the rear. Refer to the “Connection” chapter for more details.Important The system control bus terminating circuitry board must be connected to the system control bus at all times. If the board is disconnected, the state of much of the bus will be undefined. This may cause corrupted data to be present on the bus when the reciter reads the states of the switches on the control panel. This in turn may result in random actu-ations of microphone PTT, carrier, or speaker key, causing the BSS to transmit or the speaker to be actuated incor-rectly.Figure 1.2 5W or 50W base station inputs and outputs - front viewbRF input from reciter fterminating circuitry for system control busc12VDC low current output for reciter gsystem control busdRF output to PA hDC output (for optional reciter fan only)e12VDC low current input from PAbdecgfghPA reciter
TB8100 Installation and Operation Manual Appendix 1: 12V PA iii© Tait Electronics Limited December 2004DC PowerThe TB8100 12V PA is designed to accept a nominal 12VDC input with negative ground. There is a minimum DC start-up threshold to prevent damaging a battery which has little capacity left.You must connect the DC supply from the battery to the PA via a fuse or DC-rated circuit breaker with the appropriate rating, as shown in the table below. The DC input leads should be of a suitable gauge to ensure less than 0.2V drop at maximum load over the required length of lead. Figure 1.3 5W or 50W base station inputs and outputs - rear viewbsystem interface connector fRF outputcexternal reference frequency input gRF inputd12VDC input hauxiliary DC input for system interfaceePower Saving control input isubrack ground connectorcd efghPAreciterbiNominal Supply VoltageInput Voltage RangeCircuit Breaker/Fuse RatingRecommended Wire Gaugeaa. For a length of 1.5m to 2m (5ft to 6.5ft) (typical).12VDC 10.6VDC to 16.8VDC 20A 2AWG / 35mm2
iv Appendix 1: 12V PA TB8100 Installation and Operation Manual© Tait Electronics Limited December 2004The pin allocations for the 2-way DC input connector are shown below.Figure 1.4 Recommended DC power connectionPin Description1 +V input2groundBatteryPMUCircuit Breakeror Fuse2-way connector - external viewbc

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