User's Manual

Innovator CU0TD-1/CU0RD-1 – CU4TD/CU4RD System Description
ATSC Transmitter/Regenerative Translator
Instruction Manual, Rev. 1 15
NOTE: Information and drawings on the Axciter Modulator Drawer are
contained in the separate Axciter Instruction Manual.
Exciter 1 consists of the (A4) Axciter Modulator Tray, the (A2) Axciter Relay, the
(A1) Exciter/Driver Assembly Exciter 1, the (A3) system metering board and the
(A5) 2 way splitter.
Exciter 2 consists of the (A14) Axciter Modulator Tray, the (A12) Axciter Relay,
the (A11) Exciter/Driver Assembly Exciter 2, the (A13) system metering board
and the (A15) 2 way splitter.
Each of the exciter/driver assemblies typically contains (A3) the Downconverter
Board (1311103), (A4) the Frequency Agile Upconverter board (1309695), (A6)
the Amplifier Assembly (1315008), (A7) the Output Metering Detector Board
(1312207), (A8) the Innovator CX Control Board (1312543), (A9) the +5V, ±12V
Power Supply and (A10) the +48VDC Power Supply. NOTE: If your system
contains 888A amplifier devices, the Amplifier Assembly may be (1315381).
The SMPTE-310 inputs connect to the rear panels of the (A4 & A14) Axciter
modulator Drawers at the BNC connectors J27. The ASI Inputs, if option is
present, connect to the ASI BNC input jacks J33 on the rear panels of the
Drawers. The Optional External 10MHz reference inputs connect to J9 on the rear
panels of the Axciter modulator trays. The Axciter modulator tray converts the
ASI input into a digital IF signal at 44 MHz. The IF is connected to the digital
upconverter board (1309695) that takes the 44 MHz IF signal and converts it to a
TV channel frequency in the range of 54-860 MHz. The RF on channel signal is
fed to the ALC Board, Innovator CXB Series (1308570), which is used to control
the drive power to the RF amplifier chain in the Transmitter. The RF is connected
to the (A6) Amplifier Assembly (1315008) that is made up of (A6-A1) the 2 Stage
UHF Amplifier Board (1308784) and the (A6-A2) the RF Module Pallet (1309580).
The assembly also contains the (A6-A3) ALC Board (1315006). In systems that
contain 888A amplifier devices, the RF is connected to the (A6) Amplifier
Assembly (1315381) that is made up of (A6-A1) the 1 Watt Amplifier Board
(1315730), and the (A6-A2) the BLF881 Amplifier Board (1314882) and (A6-A3)
the Dual 888A Amplifier Pallet (1315347). The assembly also contains the (A6-
A3) ALC Board (1315006 for systems that contain an Axciter or 1308570 for all
other systems). The assembly has approximately 40 dB of gain. The amplified
output at approximately +50 dBm connects to the (A7) Output Detector Board
(1312207) which provides forward and reflected power samples to the CU Control
Board (1312543) for metering and monitoring purposes. An output power
sample is also supplied to the front panel sample jack J15, which is a 50 Ohm
BNC type. The typical sample value is approximately 60dB down from the output
power level of the tray. The RF output is cabled to J9 the “N” connector RF
output jack on the rear panel of the tray. The RF outputs of the Exciter/driver
trays connect to (A20) the Exciter Output Routing Switch. The control panel
selects which exciter/driver output is connected to J1 on the Power Amplifier
Tray. The control and operating parameters of the Amplifier Tray are displayed
on the LCD Screen located on the selected ON Air exciter/driver tray. In the
CU500/600 tray, the input RF signal at J1, located on the rear panel of the tray,
is fed to J1 on the 4 Way Splitter Board, which supplies four outputs, one to each
amplifier pallet. Each amplifier pallet has approximately 14 dB gain. The
amplified outputs of the pallets are combined in the 4 Way combiner board whose
output is at J1. The RF is connected to J2 the 7/16” (1.1cm) Din RF output jack