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User Manual
Rev. 3.0 - 21/03/18
PJ5000U-K
The splitter is used to divide input power from PWR Input Measure card and to
supply a part of it to every RF module. The combiner is used to combine output
power from every RF module so as to have total power amplifier.
Splitter, amplifier and combiner are plans so that powers generated from the
amplifiers add its in phase, diminishing the loss of balance and therefore the
dissipation of useful power.
All RF section is placed on a fin that supplies to the cooling through forced
ventilation.
Every RF module supplies 850 watts and is supplied from own switching supply.
The active device used in the amplifier modules is a single LD Mosfet.
The task of the low-pass filter is to reduce the harmonic emissions of the amplifier
to below the levels allowed by standards.
7.2.3 Bias Board
The task of this card is to measure the current drawn by the RF modules, and the
several input and output power, providing for fault reporting and the management
of their guards.
This card also carries the signals to the DB15 connector, located on the rear panel
of the equipment, in RS485 standard for uses in multiple amplifiers systems
The card also manages the
/LD-PJ
option, if it were installed in the machine.
7.2.4 Directional Coupler
The task of this card is to take a part of RF signal and send it to the interface card,
where it will be straightened and measured.
The directional coupler is an integral part of output connector.
