User's Manual

Innovator CU0TD-1/CU0RD-1 – CU4TD/CU4RD ATSC Board Descriptions
Transmitter/Regenerative Translator
Instruction Manual, Rev. 2 120
The other half of the split is connected to the peak calibration pot R18, analog, which
adjusts the level of the signal connected to Pin 8 on U2. U2 is a Bilateral Switch IC whose
output, digital or analog, is controlled by the selection of the modulation type in the
exciter/driver drawer. In this BTC transmitter the average, digital, output connects to the
amplifier IC U3A that is wired to the SYS_FWD and RMT_FWD Power Metering Outputs. A
reading of 2 VDC measured at TP1 is equal to a 100% Forward Power reading on the
meter. The SYS_FWD level connects to J9 on the board that is cabled to J11 on the
exciter/driver drawer for use in the control monitoring assembly. The RMT_FWD level
connects to J10 on the board for use by remote control and monitoring.
A sample of the reflected output power, from the external (A11) output coupler, enters
the board at the SMA jack J8. The signal is filtered and connected to resistors R26, R22
and R27 that form an input impedance-matching network to Pin 3 on U6. The reflected
power signal is detected by the RF detector IC U6. The detected output at pin 7 is
connected to the reflected calibration pot R25, which adjusts the level of the signal
connected to the amplifier IC U3B that is wired to the SYS_RFLD and RMT_RFLD Power
Metering Outputs. A reading of 2 VDC measured at TP2 is equal to a 25% Reflected
Power reading on the meter. The SYS_RFLD level connects to J9 on the board that is
cabled to J11 on the exciter/driver drawer for use in the control monitoring assembly. The
RMT_RFLD level connects to J10 on the board for use by remote control and monitoring.
+12 VDC enters the board at J9-1, from the exciter/driver drawer and is connected
through a filter and isolation circuit consisting of C31, C14 and L5 before it is connected to
the regulator IC U5. U5 supplies the +5 VDC needed for operation of the ICs on the
board. The +5 VDC is connected through a filter circuit consisting of C15, C19 and C21
before it is connected to the rest of the board.
(Optional) ASI to S310 Converter Module
NOTE: The ASI to S310 Converter Modules is only used with STL ASI feed inputs.
The ASI to SMPTE 310M converter takes the STL ASI feed input, if present in your system,
and converts it to a SMPTE 310M output which connects to the input to the UBS-Axcera
system. The converter contains an ASI Motherboard (1311179), an ASI to 310
Conversion Board, Non-SFN (1311219) or ASI to 310 Conversion Board, SFN (1309764),
and a 120 VAC to +12 VDC converter module.
ASI Motherboard (1311179)
The ASI motherboard takes the +12 VDC, from the 120 VAC to 12 VDC converter
module, and converts it to +5 VDC and +3.3 VDC which are used by the ASI to S310
conversion board.
U1 is a regulator IC that supplies an output of +5 VDC at J2-7 that connects to the ASI
to 310 converter board. U2 is a regulator IC that supplies an output of +3.3 VDC at J2-
11 that connects to the ASI to 310 converter board. Also +12 VDC is wired to J2-3 that
connects to the ASI to 310 converter board.
The ASI motherboard is the mounting platform for the four LEDs that are displayed on
the front of the module. The LEDs will be Green if everything is OK or Red if the
indicated function is malfunctioning.