User's Manual Part 1

Features - 8 -
®
Affinity LBD-200C-N1 Transmitter
Product Manual
4.2 Affinity® Low Power Transmitter Configurations
There are three basic transmitter configurations available:
Single Drive – One exciter/driver chain drives the power amplifiers in parallel. This configuration
includes options for N+1 power supply.
Dual Drive – Two exciter/driver(s) operating in a main/standby automatic switching mode drives
the power amplifiers in parallel. This configuration includes options for N+1 power supply.
Diversity Transmitter – This configuration can feed four antennas in 90
o
sectors. There are two
independent single drive transmit chains fed by a common exciter with embedded time delays
on each output. The exciter time delay function is defined in the DVB-H standard, EN 300744.
The delay must be within the guard interval defined in the network, and should add a few
microseconds of delay in relation to the other transmitter in the site. The timing information can
be sent to the transmitter via the Megaframe Information Protocol (MIP) or can be adjusted
locally in the modulator.
4.3 Affinity® Family Construction
The Affinity® family of low power solid-state DTV transmitters is designed to provide maximum
flexibility for site layout and installation. All of the transmitter chassis are designed to fit in EIA
standard 19” wide equipment cabinets. Outdoor installations are equipped with high quality front
and rear access enclosures. These enclosures maintain security and protection against external
elements. Transmitter systems are available in several configurations based on output power,
redundancy options, and site system requirements.
Single channel, non-redundant transmitter configurations (SD) are sized as follows:
For 50 to 125 watt average output power levels, the upconverter and amplifier are self-
contained in a single 6 rack unit (RU) chassis. The N+1 capable power supply is housed
in a 3RU chassis, and the Thales DVB- T/H RF exciter is contained in a 2RU chassis.
This 11RU transmitter is the most compact Thales Affinity system.
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For 200 watts average output power levels, three chassis are used (14RU total). The
upconverter assembly is self-contained in a single 3RU chassis. The power amplifiers
are housed in a 6RU chassis. The N+ 1 capable power supply is housed in a 3RU
chassis and the Thales DVB- T/H RF exciter is housed in a 2RU chassis.
For 400 watts average output power levels, four chassis are used (20RU total). The
upconverter assembly is self-contained in a single 3RU chassis. The power amplifiers
are housed in two 6RU chassis. The N+1 capable power supply is housed in a 3RU
chassis and the Thales DVB- T/H RF exciter is housed in a 2RU chassis.
A dual drive transmitter operating in main/standby configuration (DD) is sized as follows:
The Thales DVB-H RF exciter is contained in a19” 9RU chassis that includes: 2RU chassis for
the DVB-H RF exciters, 3RU chassis that house the CPU board with PSU, the DVB-H RF
Exciter/Up Converter, and the amplifiers interface board. 1RU is used for the fan unit and air
inlet, and 1RU for the dedicated front panel that supports the touch screen and bar graph.