Port Locations; Power Supply; Figure 2-7 Housing Ports - Motorola STARLINE SERIES Installation And Operation Manual

2-6 Overview

Port Locations

Five port plugs in the cover enable access to internal test points. The input and output ports
provide connection for coaxial cables and are protected by factory-inserted threaded plugs or
plastic cap plugs. Discard the plastic cap plugs when you install the cable connectors.
Figure 2-7 illustrates the housing port locations:
Figure 2-7
Housing ports
Port 1
Port 3

Power Supply

The cover of the amplifier houses the model MPPS-II 60/90 power pack. It provides a regulated
24 Vdc output at 1.8 amps maximum over an ac input voltage range from 38 Vac to 90 Vac rms.
The input voltage waveshape is either a squarewave or a sinewave. The surge protector and the
EMI filter protect the power pack and amplifier from transient spikes. An integral fast-acting
zener diode provides additional surge protection.
The preregulator is a fixed frequency switching regulator that presents a near perfect power
factor to the input line and provides overvoltage and overcurrent protection. A precision output
regulator provides a precise output voltage and is also protected against overcurrent and short
circuits. If a short circuit is detected, the power supply shuts down and the regulator initiates a
sequence of line test pulses at approximately one-half second intervals. The regulator continues
these pulses for the duration of the short circuit but returns to normal operation when the fault
is cleared.
MB*/* Installation and Operation Manual
Messenger
clamp bolts
Lid
Port 2
Port 4