26 / 30
User Manual
Rev. 1.2 - 21/01/11
TEX2000LCD
8. Working Principles
The figures below provide an overview of
TEX2000LCD
(fig. 8.1) modules and
connections.
DRIVER
SPLITTER
MAIN BOARD
LPF +
DIRECT. COUPL.
COMBINER
FUSE BOARD
BIAS
INTERFACE
PANEL
TELEMETRY
INTERFACE
ALIM 24V 3A
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 50VDC
4 X VPA (50VDC)
VPA (50VDC)
4 X VPA (50VDC)
FWD PWR
RFL PWR
BIAS
PS ALARM
VOLTAGE REG.
Figure 8.1
Following is a brief description of the different module functions; all diagrams and
board layout diagrams are included in the “Technical Appendix” Vol.2.
8.1 Power supply
TEX2000LCD power supply sections are made up of a surge protection module
and two power supply units:
1. Surge Protection module (see description in sect. 8.1.1): protects the
equipment from possible voltage surge events and electric discharges in the
power mains.
2.
Power amplifier supply unit:
provides adequate power supply for RF power
amplifier modules. It is a switching power supply unit with PFC full range; for
details of the PFC and converter modules, please see sections 8.1.2 and 8.1.3,
respectively.
3. Service power supply unit: provides adequate power supply for all modules
except RF power modules. This is a power supply unit based on switching
technology.
NOTE: Please see section 5.1 for power supply unit settings.
8.1.1 Mains power supply pulse protection (SLSRGPRPJ1KM)
This module is enclosed in a sealed metal case; it features two externally mounted
mains fuses (figure 6.2 - [18] and [33]) and accommodates a bank of surge arresters
