10/6/10 888-2629-200 1-7
WARNING: Disconnect primary power prior to servicing.
Section 1 Introduction
Maxiva ULX COFDM Series
first PA cabinet will assume the role of master controller for the system. The TCU’s in
the remaining PA cabinets will be slaves.
1.2.4 Transmitter RF Power Control
The PA modules operate in open loop mode (no gain or level adjustment). The
transmitter RF power control is done via the Phase and Gain Board located in the
predriver modules. The predrivers are the only components in the drive chain (besides
the exciter) capable of adjusting their RF power based on commands from the TCU.
Each cabinet can also be placed in the "Manual Power Control Mode". In this mode the
automatic level control is disabled.
1.2.4.1 Graphical User Interface
The TCU front panel (in the control PA cabinet on multi-cabinet transmitters) contains
the graphical user interface which is a 5.25" 1/4 VGA, LCD touchscreen display. The
touchscreen display uses software buttons to monitor and control the transmitter.
Hardware buttons for the primary transmitter functions such as ON, OFF, RAISE and
LOWER are provided on the overlay panel next to the display.
TCU’s in additional PA cabinets will not be equipped with GUI screens.
Figure 1-4 TCU Front Control Panel
1.2.5 Control System Communications
The control system uses a serial communications system called a CAN bus. CAN stands
for Controller Area Network. The CAN bus is a closed loop serial network controlled
by the main TCU. The CAN bus connects the main TCU with TCU’s in other cabinets.
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