User's Manual

Innovator CU0TD-1/CU0RD-1 – CU4TD/CU4RD System Description
ATSC Transmitter/Regenerative Translator
Instruction Manual, Rev. 2 14
System Description
Product Architecture
The Innovator CX Series Systems can be configured as DTV Transmitters (i.e CU3TD) or
Regenerative Translators (i.e CU3RD). The DTV Transmitter (TD) takes an ASI input
and converts it to an On-Channel DTV RF output signal. The Regenerative Translator
(RD) accepts an On-Channel RF signal (-79 to –8 dBm) and converts it to an On-Channel
DTV RF output signal. If an optional preamp is present in the system, it is connected to
the output of the receive antenna and amplifies the weak signal approximately 20 dB.
In single drawer systems (CU0TD/RD-1 through CU0TD/RD-5), the CX drawer is
configured as a transmitter/repeater with an output power level of 5, 30, 50, 100 or 150
Watts ATSC. In multi drawer systems, the CX drawer is configured as an exciter/driver
used to drive additional power amplifier drawers; a single amplifier drawer can operate
at 250, 400 or 750 Watts ATSC; two amplifier drawers can operate at 1400 Watts ATSC;
three amplifier drawers can operate at 2100 Watts ATSC; and four amplifier drawers can
operate at 2500 Watts ATSC.
The Innovator CX Series system provides Adaptive Linear and Non-linear correction
capability for the transmission path as well as internal test sources that are used during
initial system installation. If your system contains the Optional Internal GPS Kit, the
output of the GPS Antenna connects to the J5 TNC connector on the rear panel of the CX
drawer. This kit supplies 10 MHz and 1 PPS references for use in the CX drawer.
CX Drawers
The CX drawer contains the (A12) 8VSB ATSC Digital Modulator (1316294), the (A15)
Downconverter (1316715) and the (A16) Capture Board (1316716). The drawer also
contains the (A6) the Amplifier Assembly, (A7) Output Detector Board (1312207), (A8)
the Innovator CX Control Board (1312543), (A10) the +28V/+32V/+42V/+48VDC Power
Supply and (A9) the +5V, ±12V Power Supply. To make the system a regenerative
translator, the RD kit (1310182) supplies the (A1) 8 VSB Demodulator Board (1308275)
for the drawer.
The type of (A6) Amplifier Assembly used in the drawer changes as the output power of
the system changes. The Amplifier Assembly (1316313) is used in CU0TD/RD-1
systems, the Amplifier Assembly (1312566) is used in CU0TD/RD-2 systems, the
Amplifier Assembly (1316636) is used in the CU0TD/RD-3 systems and the Amplifier
Assembly (1316035) is used in CU0TD/RD-4 and CU0TD/RD-5 systems.
The (A10) Power Supply Assembly also changes as the output power of the system
changes. A +48V/300W Power Supply is used in CU0TD/RD-1 systems, a +28V/300W
Power Supply is used in CU0TD/RD-2 Systems, a +48V/1100W Power Supply is used in
CU0TD/RD-3 systems and a +48V/1100W Power Supply is used in CU0TD/RD-4 and
CU0TD/RD-5 systems.
When configured as an ATSC Transmitter (TD), the ASI “A” input at (J1) connects
directly to the input jack (J30 or ASI IN1), and the ASI “B” input at (J2) connects
directly to the input jack (J31 or ASI IN2), on the (A12) 8VSB Modulator Board.
The 8VSB Modulator Board automatically selects the ASI “A” or “B” input depending on
which input is present.