Operation Manual Part 1

Digital Liquid Cooled UHF
TV Equipment
Generale description
9946 V1
45321648.01 104 A E
preliminary
11 / 131
Numéro / Number Doc. Rev. Lan
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16/06/2006
Pa
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Information contained is this document is confidential, is THOMSON property and cannot be disclosed in whatever form without prior written authorization of THOMSON.
Each digital exciter consists of:
• A SIRIUS rack with :
A DVB-T (Europe) modulator board , ATSC (America) modulator board or MédiaFLO modulator
board
a processing signal board,
an RF synthesiser,
a preamplifier,
a Very Low Voltage power supply,
• In the management rack, a RF amplifier (for DVB-T and ATSC modulator only)
♦ a coaxial relay and its 50 Ohms load so that one of the two digital exciters can be switched on RF
amplifier channel.
♦ an RF amplifier way,
♦ a filter unit which filters the RF signal,
♦ a control system as follows:
• A Central Processing Unit (CPU) which supervises the operation of the transmitter electronics
units depending on operator commands and the status conditions in the units.
• the very low voltage power supply for the CPU and the PCL,
• an exciter/CPU interconnection card,
♦ a multiplex card which is the connection unit between the Central Processing Unit and the main
transmitter electronic units,
♦ a Local Control Panel (PCL) which controls the data interchange between the operator and the
transmitter,
♦ a Mains Distribution Panel which provides the mains feeds for the various transmitter power
supplies,
♦ the power supplies for the RF amplifiers,
♦ the cooling system for the Exciter/CPU system.
The following associated external sub-systems for the SD/DD transmitters combine together to form a
complete transmission operation:
♦ an external cooling system to cool the transmitter,
♦ an input three-phase mains supply,
♦ an external changeover system so that the transmitter can be switched between a dummy load and
the antenna,
♦ A remote user interface (optional) with facilities for remote control of the transmitter.
Simple Drive transmitter
The Single Drive version is physically different from the Double Drive version in that it only has one
digital exciter .