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TB8100 Installation and Operation Manual Appendix 1: 12V PA i

Appendix 1: 12V PA

Boost Regulator Circuit Description

This 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 diagram

Board

Control Board

Boost Regulator

60W

Board

Ambient Air

Temperature

Sensor

Board

Low-Pass

Filter

Directional

Coupler

Board

RF I/P +

PA Key

RF O/P

12VDC

I/P

12VDC O/P

(Reciter)

28VDC28VDC

RF RF

Control &

Monitor

Control &

Monitor

Control &

Monitor

System

Control

Bus

Summary of content (4 pages)

PAGE 1
Appendix 1: 12V PA Boost Regulator Circuit Description This 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. Figure 1.
PAGE 2
Overview of Inputs and Outputs This 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. Figure 1.
PAGE 3
Figure 1.3 5W or 50W base station inputs and outputs - rear view b c i h d g e f reciter b c d e system interface connector external reference frequency input 12VDC input Power Saving control input PA f g h i RF output RF input auxiliary DC input for system interface subrack ground connector DC Power The 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.
PAGE 4
Figure 1.4 Recommended DC power connection Circuit Breaker or Fuse PMU Battery The pin allocations for the 2-way DC input connector are shown below.