888-2408-002 4-1
WARNING: Disconnect primary power prior to servicing.
Overall System
Theory
4.1 Introduction
This section contains theory of operation and circuit descriptions of the Platinum
Z5™ FM Broadcast Transmitter.
The Platinum Z5™ has two possible designations:
• Z5CD, which is a 5kW FM transmitter supplied with the DIGIT, digital FM
exciter. CD stands for Clearly Digital.
• Z5FM which is a 5kW FM transmitter supplied with the SuperCiter, analog FM
exciter.
4.2 RF Flow Block Diagram Description
Figure 4-1 is a block diagram of RF flow of the Platinum Z5 transmitter. Not shown
on this diagram is the control and monitoring associated with the advanced
Controller and Diagnostics system.
4.2.1 Exciters
It starts with the built in dual exciter option (in other words the switching
components are present but the exciter is optional). The RF output of both exciters
(if present) connect in to the Exciter/IPA Backplane board. The exciter RF switch
shown on this board is activated by the controller if Exciter A were to fail, placing
Exciter B on the air automatically. This fault and all other transmitter faults are
stored in the Fault Log in the Diagnostics Display System. The active exciter output
is selected by the first RF switch and directed to the active IPA by the second RF
switch. Both RF switches are controlled by the Master Controller.
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