Comtech EF Data PCB-4300 - Manual (Page 31)

3–1
Chapter 3. OPERATION
AND
ADJUSTMENT PROCEDURES
IMPORTANT
Before attempting any of the procedures featured in this chapter, the user is strongly
advised to read Chapter 1. INTRODUCTION to become familiar with system terminology
and Theory of Operation, and Chapter 2. EXTERNAL CONNECTORS to become familiar
with the PCCB’s connectors and their functionality.
3.1 Overview
As indicated in Chapter 1. INTRODUCTION, the PCB-4300 1:2 Phase Combiner system has
adjustments made, using a network analyzer in the factory, to the amplifier gains and phase
shifters. As these in-factory adjustments are based on the specific arrangement of the SSPAs
within the system, in order to ensure proper system operation and performance it is mandatory
that the components are installed in the same positions as was done in the factory. See Section
3.2 in this chapter for the steps needed for the proper assembly and installation of a typical 1:2
Phase Combiner System.
As the factory alignment/adjustment of the system facilitates easy adjustment and setting of the
phase shifter for optimum output power combining over the full amplifier bandwidth, alignment
in the field is generally not required and the user is strongly cautioned against making
unneeded adjustments.
However, if an amplifier or other critical system component (e.g., the PCB-4300 unit) is replaced,
the procedures provided in this chapter explain the steps necessary to restore proper system
operation. Procedures for both single frequency and full bandwidth operation are provided in this
chapter, as well as a verification procedure that is furnished for the user who simply wants to
confirm that the system is working properly.
IMPORTANT
It is recommended that only qualified personnel familiar with high-power
amplifiers, test equipment, and phase combined systems attempt these
procedures.