Operation Manual Part 1

Digital Liquid Cooled UHF
TV Equipment
Generale description
9946 V1
45321648.01 104 A E
preliminary
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Numéro / Number Doc. Rev. Lan
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16/06/2006
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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.
1.2. Simplifier description of transmitter
1.2.1. Basic operation
The MPEG-2 input signals are fed to the exciter inputs, they are converted into digital I and Q
components and are then transposed into RF signals and pre-amplified.
The Dual Drive (DD) version of the transmitter contains two identical exciters, one of which can be
switched to air if the other develops a fault; this on-air switch can be performed automatically or by the
manual intervention of the operator.
The Single Drive (SD) transmitter has only one exciter.
The RF signal from the on-air exciter is fed to a RF amplifier channel.
A central control system monitors the operation of the various units, the operational commands, the
transmitter configuration commands and the data exchange with the user interface.
The BRA/DASI function integrated into each digital exciter provides a fail-safe protection system for
the ASI standard Transport Stream source. This functions provides also for bit rate matching at the
input to the integrated DVB-T or MediaFLO encoder.