User's Manual

Innovator CU0TD-1/CU0RD-1 – CU4TD/CU4RD ATSC Board Descriptions
Transmitter/Regenerative Translator
Instruction Manual, Rev. 2 115
(A7) Output Detector Board (1312207)
The (A7) Output Detector Board provides forward (2V=100%) and reflected (2V=25%)
power samples to the CU Control Board for metering and monitoring purposes. R7 is the
reflected power calibration pot and R23 is the forward power calibration pot. A Forward
power sample, -10 dBm, connects to J4 on the board, which is cabled to the front panel
sample jack of the drawer. The RF output of the board, typically +46 dBm, is at J2,
which is cabled to J9 the RF Output Jack of the drawer. The (1312207) output detector
board can be used as either an average, for digital, or peak, for analog, detector board
using jumpers on J5 and J6.
(A8) Control Card, Innovator CX (1312543)
The Innovator CX control board provides the overall system control for the CX system.
There are two main elements of the board, U7 and U9. U7 is a programmable logic
device that is loaded with firmware, which provides the overall system control. It
decides whether or not to allow the system to generate RF output power, and turns the
+40 VDC power supply on and off depending on whether or not it is receiving any faults,
either faults generated on board, or faults generated externally. The second major
component of the board is the microcontroller U9, which controls the front panel
indications and drives the display. The U9 microcontroller is not involved in the decision
making process, U7 does that. Rather, it is layered on top of U7 and is the EPLD's
interface to the outside world. Information is passed between the microcontroller and
the EPLD. The microcontroller communicates information to and from the front panel
and sends the EPLD the information it needs to decide whether or not to allow the
system to turn on. The front panel viewable LEDs DS3 for Operate/Standby and DS4 for
Status indicate the current operating condition of the system are mounted on and
controlled by this board. The U9 microcontroller can also communicate, using the
Optional Ethernet Kit, with a daughter card that allows the user to view remote control
parameters via a web Ethernet interface.
The ±12 VDC and +5 VDC from the (A9) power supply and the 39-42 VDC from the
(A10) power supply are routed to the other boards in the drawer through this board.
The +40 VDC power supply operates all the time, and connects the 39-42 VDC to the
board at J19-1, 2, & 3 with 5 common. Q13 on the control board is turned on and off to
gate the 39-42 VDC, which connects through J19-6, 7 & 8, to the RF output stages.
The ±12 VDC and +5 VDC input voltages to this board is connected through J21 and
filtered before being connected to the rest of the board. +12 VDC connects through
J21-1, +5VDC through J21-2 & 3, and -12 VDC through J21-6. Common connections for
the input voltages are connected to J21-4 & 5. The ±12 VDC and +5 VDC are used on
this board and also routed to the other boards in the drawer through this board. The
+3.3 VDC for the microcontroller and programmable logic array, mounted on the board,
is provided by the voltage regulator IC U6 from the filtered +5 VDC input. The output of
U6 can be adjusted to +3.3 VDC using R120.