Instruction Manual
6X Series Liquid-Cooled Transmitter Chapter 4, Circuit Descriptions
Instruction Manual, Rev. 0 4-6
4.3.4 (A8) Interface Board (1312562)
The RF output of the phase/gain board connects to the SMB connector J1 on the
interface board. The RF is fed though solder track to J4 the output pad on the board.
A wire jumper is soldered from the J4 pad to the J1 input pad, (≈.6Watts ATSC), on
the driver pallet assembly. A wire jumper is soldered from the J3 pad to the J3 Data
pad on the driver pallet assembly. A wire jumper is soldered from the J5 pad to the
J5 Slot location pad on the driver pallet assembly.
Refer to section 4.3.7 for the description of the (A7) 878 Driver Amplifier Pallet.
4.3.5 (A5) 4 Way Splitter Board, Top (1312033)
The Top 4 way splitter board takes the RF from the 878 Amplifier Pallet driver at J1
(≈45Watts ATSC) on the board and connects it to a coupler U2. One output of the
coupler is fed to a two way splitter. The other output of the coupler is wired to a Log
Amplifier IC U5 which produces a voltage reference of the RF input level to the top
splitter board, which connects to the U4 microcontroller. R15 is a thermistor
mounted on the heat sink for the splitter, which generates a voltage reference of the
temperature of the heat sink that is connected to the U4 microcontroller. The
microcontroller takes the inputs and supplies a serial data output that is buffered by
U3 before it is wired to the Serial Data Line connections at J6-2 and J7-2. Serial
Data is also connected to the amplifier pallets through Jacks J9 to amplifier pallet 1,
J10 to amplifier pallet 2, J11 to amplifier pallet 3, and J12 to amplifier pallet 4. J15
is the programming port which is initially used to program the U4 microcontroller and
is not used by the customer.
One output of the two way splitter connects to the output jack J8 which is cabled to
the input of the bottom 4 Way splitter. The other output of the two way splitter is
connected to a four way splitter. The four equal outputs (≈4.5 Watts) connect at J2
to amplifier pallet 1, J3 to amplifier pallet 2, J4 to amplifier pallet 3, and J5 to
amplifier pallet 4.
The final amplifier Pallet Slot location identification is achieved using the resistor,
each one a different value, connected to J16 for pallet 1, J17 for pallet 2, J18 for
pallet 3, and J19 for pallet 4.
+5 VDC is supplied to the top splitter board thru J6-3 & 1 from the bottom splitter
board. The +5 VDC connects to U5 on the board and to the 3.3V regulator IC U6.
The regulator IC takes the +5 VDC input and generates the regulated +3.3VDC that
is used by the ICs U3 and U4. The Green LED DS1 is lit if the +3.3VDC is present on
the board.
4.3.6 (A6) 4 Way Splitter Board, Bottom (1310448)
The Bottom 4 way splitter board takes the RF from the top 4 way splitter board at J1
(≈45Watts ATSC) on the board and connects it to a four way splitter. The four equal
outputs (≈4.5 Watts) of the splitter connect at J2 to amplifier pallet 5, J3 to amplifier
pallet 6, J4 to amplifier pallet 7, and J5 to amplifier pallet 8.
R15 is a thermistor mounted on the heat sink for the splitter, which generates a
voltage reference of the temperature of the heat sink that is connected to the U4
microcontroller. The microcontroller takes this input and supplies a serial data
output that is buffered by U3 before it is wired to the Serial Data Line connections at
J6-2 and J7-2. Serial Data is also connected to the amplifier pallets through Jacks J9