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User Manual
Rev. 2.0 - 27/01/20
TEX3500LCD
7. Working Principles
The figures below provide an overview of
TEX3500LCD
(fig. 7.1) modules and
connections.
DRIVER
SPLITTER
MAIN BOARD
LPF +
DIRECT. COUPL.
COMBINER
FUSE BOARD
BIAS
INTERFACE
PANEL
TELEMETRY
INTERFACE
POWER SUPPLY
SURGE
PROT.
PFC
LED CARD
INPUT
(AUDIO/RDS)
R.F.
OUTPUT
RF MODULES
MAINS
R.F.
R.F.
4 X R.F.
4 X R.F.
R.F.
DC
4 X 46VDC
4 X VPA (46VDC)
VPA (46VDC)
4 X VPA (46VDC)
FWD PWR
RFL PWR
BIAS
PS ALARM
VOLTAGE REG.
Figure 7.1
Following is a brief description of the different module functions; all diagrams and
board layout diagrams are included in the “Technical Schedule” Vol.2.
7.1 Power supply
The
TEX3500LCD
power supply can be divided into two basic sections: Services
and Power Supply, which provide adequate power to the RF power amplifier
modules.
The unit has a rectifier (PFC) able to ensure a cos φ of 0.998 and a switching
power supplies that allow an efficiency of 90%.
7.2 Interface board
This board performs the following tasks:
•
It uses AC voltage to generate and distribute service power supply over the
panel card.
•
It controls and provides interfacing of the power amplifier supply module.
•
It processes and provides interfacing of the control signals to/from the Bias
card.
•
It processes and provides interfacing of the control signals to/from the Panel
card.
•
It feeds and operates the cooling fans.
