User's Manual

Innovator CU0TD-1/CU0RD-1 – CU4TD/CU4RD System Description
ATSC Transmitter/Regenerative Translator
Instruction Manual, Rev. 2 15
When configured to operate as a Regenerative Translator (RD), the DTV ON Channel RF
Input at (J1 or J5), (-8 to -79 dBm) connects to the Tuner Input Jack on (A1) the 8 VSB
Demodulator Board (1308275) supplied with the (RD) kit. The 8 VSB Demodulator
Board converts the DTV input to a SMPTE-310 output at (J13), which is connected to the
input jack on the (A12) 8VSB Modulator Board. The output of the 8 VSB modulator
board at the RF output jack X-502 connects to J1 on the (A6) amplifier assembly.
The 8VSB Modulator Board converts the ASI or SMPTE-310M input to a digital RF TV
channel frequency in the range of 470-860 MHz.
The RF on channel signal is fed to J1 on the amplifier assembly that connects to the ALC
Board, Innovator CX Series (1315006), which is used to control the drive power to the
RF amplifier chain in the CU0TD/RD-1, CU0TD/RD-2, CU0TD/RD-3, CU0TD/RD-4 and
CU0TD/RD-5 Transmitter/Translators.
In a CU0TD/RD-1 system, the RF is connected to the (A6) Amplifier Assembly (1316313)
that is made up of (A6-A1) the 1W UHF Amplifier Board (1310282) and (A6-A2) the
BLF881 Single Stage Amplifier Board (1314882). The assembly has approximately 35
dB of gain. The amplified output at approximately +37 dBm connects to the (A7)
Output Detector Board (1312207) which provides forward (2V=100%) and reflected
(2V=25%) power samples to the CU Control Board (1312543) for metering and
monitoring purposes.
In a CU0TD/RD-2 system, the RF is connected to the (A6) Amplifier Assembly (1312566)
that is made up of (A6-A1) the 2 Stage UHF Amplifier Board (1308784) and (A6-A2) the
RF Module Pallet w/Philips transistors (1300116). The assembly has approximately 36
dB of gain. The amplified output at approximately +38 dBm connects to the (A7)
Output Detector Board (1312207) which provides forward (2V=100%) and reflected
(2V=25%) power samples to the CU Control Board (1312543) for metering and
monitoring purposes.
In a CU0TD/RD-3 system, the RF is connected to the (A6) Amplifier Assembly (1316636)
that is made up of (A6-A1) 1W UHF Amplifier Module (1310282), the (A6-A2) single
Stage UHF Amplifier Board (1314882) and (A6-A3) the RF Module Pallet w/Philips
transistors (1316084). The amplified output connects to the (A7) Output Detector Board
(1312207) which provides forward (2V=100%) and reflected (2V=25%) 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 in a CU0TD/RD-3 is approximately 60dB
down from the output power level of the drawer.
The RF output is cabled to J9 the “N” connector RF output jack on the rear panel of the
drawer. In CU0TD/RD-1, CU0TD/RD-2, CU0TD/RD-3, CU0TD/RD-4 and CU0TD/RD-5
systems the output connects to a digital mask filter, low pass filter and then the antenna
for your system. In CU1TD/RD-1, CU1TD/RD-2, and CU1TD/RD-3 systems, the RF
output, from the driver drawer, is connected to J1 on the rear panel of the amplifier
drawer. The RF is cabled to J1 on the Amplifier Heatsink Assembly in the amplifier
drawer. In CU2TD/RD and higher power systems the RF is connected to a splitter and
then to the inputs of the amplifier drawers. In systems with vertically mounted amplifier
drawers, the RF output connects to the High Power Amplifier Assembly RF Input located
on the rear panel of the assembly.