1-12 888-2463-001 3/6/08
WARNING: Disconnect primary power prior to servicing.
Diamond Series™
Section 1 Introduction
1.2.5.2 Power Supplies
Up to eight 32 volt power supplies are used to provide the DC voltage to the PA
modules within each PA cabinet. Each power supply provides power to two PA
modules. The power supplies are designed to allow removal and insertion of one unit
while the remaining power supplies are operating. The control system in the PA Cabinet
is powered by redundant low voltage power supplies.
1.2.5.3 Module Combiner
The PA cabinet module combiner is an in-phase design. The combiner utilizes
circulators at each input to provide a good impedance match for the modules during any
combiner imbalance condition caused by module removal, or module failure. The
circulators and their respective terminating loads are rated for continuous operation
with the removal of any quantity of PA modules. Depending on transmitter model,
combiners are installed for 4-way, 6 way, 8-way, 12-way and 16-way applications.
1.2.5.4 Cabinet Combiner
For 2 cabinet transmitters the PA cabinets are driven in quadrature and a hybrid is used
to combine the cabinets. For transmitters utilizing 3 or more PA Cabinets, the cabinets
are driven in-phase and a Geysel style cabinet combiner is used. Up to five PA Cabinets
can be combined.
1.2.5.5 Cooling system
The PA cabinet cooling system is available in two basic versions:
• Internal cooling (standard version)
Each PA cabinet rear door houses a direct-drive fan/motor assembly sized for the
correct amount of airflow for up to 16 PA modules, module power supplies, com-
biner, reject loads and any other components requiring forced air cooling.
• Optional External cooling
The external cooling fan option allows for intake fans to be located external to the
cabinets. This allows locating the intake fan in a remote location and also may
help isolate cooling air from room air. The transmitter is equipped with openings
in the top of each PA cabinet which allows the connection of duct work to move
hot exhaust air out of the building.
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