User's Manual

Innovator CU0TD-1/CU0RD-1 – CU4TD/CU4RD System Description
ATSC Transmitter/Regenerative Translator
Instruction Manual, Rev. 2 16
Amplifier Drawers
The CU1TD/RD-1 ATSC system is made up of a CX driver drawer and a 250 Watt ATSC
amplifier drawer. The driver drawer connects to the 250 Watt amplifier drawer and
supplies the needed drive level to produce the 250 Watts output of the system.
The control and operating parameters of the 250 Watt amplifier drawer are displayed on
the LCD Screen on the driver drawer. In the 250 Watt amplifier drawer, the RF input
signal is at J1 on the rear panel of the drawer that is cabled to J1 on the amplifier pallet.
In a standard 250 Watt amplifier drawer, a single +42VDC power supply provides the
operating voltages, through the current metering board, to the amplifier pallet.
In a N+1 250 Watt amplifier drawer, two +42VDC power supplies are diode “ored” and
provide the operating voltages, through the current metering board, to the amplifier
pallet. If one power supply should malfunction, the other power supply will maintain the
necessary voltage to provide the 250 Watts output. The amplified output of the pallet,
which has approximately 15 dB gain, is connected to J2 the 7/16” (1.1cm) Din RF output
jack of the drawer. An output detector board supplies a forward and a reflected power
sample to the amplifier control board for metering and monitoring purposes.
The standard CU1TD/RD-2 ATSC system is made up of a CX driver drawer and a 400
Watt amplifier drawer. The driver drawer output connects to the 400 Watt amplifier
drawer and supplies the needed drive level to produce the 400 Watts output of the
system. The control and operating parameters of the 400 Watt amplifier drawer are
displayed on the LCD Screen on the driver drawer. In the 400 Watt amplifier drawer,
the input RF signal at J1, located on the rear panel of the drawer, is fed to J1 on the
Splitter Board, which supplies two outputs, one to each 888 amplifier pallet. Each
amplifier pallet has approximately 14 dB gain. The amplified outputs of the pallets are
combined in the 2 Way combiner board whose output is at J1. The RF is connected to J2
the 7/16” (1.1cm) Din RF output jack located on the rear panel of the drawer. The 2
way combiner board supplies a forward and a reflected power sample to the amplifier
control board for metering and monitoring purposes. In a 400 Watt amplifier drawer,
the typical sample value at J6, a 50Ω BNC jack located on the front panel of the drawer,
is approximately 65dB down from the output power level of the drawer.
The CU1TD/RD-1 ATSC system w/two dual 888 pallets is made up of a CU0TD/RD-2
drawer and a 500 Watt Amplifier Drawer w/two dual 888 pallets. The CU0TD/RD-1 is
used as a driver that connects to the external Amplifier drawer and supplies the needed
drive level to produce the 500 Watts output of the system. The control and operating
parameters of the 500 Watt Amplifier Drawer are displayed on the LCD Screen on the
CU0TD/RD-1 drawer. In the CU1TD/RD-1, the input RF signal at J1 located on the rear
panel of the drawer, is fed to J1 on the 2 Way Splitter Board which supplies two outputs;
one to each 888A amplifier pallet. Each amplifier pallet has approximately 17 dB gain.
The amplified outputs of the pallets are combined in the 2 Way combiner board whose
output is at J1. The RF is connected to J2 the 7/16” (1.1cm) Din RF output jack located
on the rear panel of the drawer. The 2 way combiner board supplies a forward and a
reflected power sample to the amplifier control board for metering and monitoring
purposes. In a CU500, the typical sample value at J6, a 50Ω BNC jack located on the
front panel of the drawer, is approximately 65dB down from the output power level of
the drawer.