User's Manual

Innovator CU0TD-1/CU0RD-1 – CU4TD/CU4RD Board Descriptions
ATSC Transmitter/Regenerative Translator
Instruction Manual, Rev. 1 67
of 470 to 860 MHz. The pallets operate Class AB and generate approximately 230 Watts
ATSC with an input of 8 Watts ATSC.
(A6) 2 Way Combiner Board (1313155), in amplifier drawer w/two Dual 888A
Pallets
The 2 way combiner board takes the two RF Inputs at J4 & J5 (≈230Watts ATSC) on the
board and combines them to a single output (≈375Watts) at J1 that connects to J2 the
7/16” (1.1cm) Din RF output jack of the drawer.
(A6) 4 Way Combiner Board (1312368), in two pallet amplifier drawer
The 4 way combiner board takes the four RF Inputs at J4, J5, J6 & J7 (≈150Watts ATSC)
on the board and combines them to a single output (≈500Watts/600Watts) at J1 that
connects to J2 the 7/16” (1.1cm) Din RF output jack of the drawer.
(A8 & A9) One, two & three pallet Amplifier Drawer Power Supplies
The 230VAC, needed to operate the drawer, connects through the AC power cord at J3,
the power entry module located on the rear panel of the drawer. The AC lines are
connected to a terminal block TB1 to which the circuit breaker(s) connect. In a N+1 one
pallet amplifier drawer and all multiple pallet amplifier drawers, there are two On/Off
20A/250VAC circuit breakers that are mounted on the back panel of the drawer on either
side of J3 the AC input jack. With the circuit breakers switched On, the AC is distributed
to the two (A8 and A9) DC power supplies. In a standard one pallet amplifier drawer
one 20 Amp circuit breaker CB1 connects the AC to the (A8) DC power supply. TB1 has
three varistors (VR1-VR3) connected across the AC input lines for surge and over
voltage protection. The AC input from TB1 also connects to through 2 amp fuses to the
two fans (A11 & A12) mounted in the drawer. Both fans will run immediately when AC
is applied to the drawer.
The +5VDC for the operation of the amplifier control board in the drawer is generated by
the (A8 & A9) power supplies at J1-9 on each power supply. The +5VDC from the (A8)
power supply connects to J4-8 and the +5VDC from the (A9) power supply connects to
J5-8 on the control board. The +5VDC is produced when AC is connected to the drawer
and the CB1 and/or the CB2 circuit breakers are turned On. Either or both power
supplies provides the +5VDC for use by the control board.
The +48VDC needed by the amplifier modules on the heatsink assembly is generated by
the (A8 & A9) power supplies in the amplifier drawer. In a standard single pallet
amplifier drawer there is only the (A8) power supply. The power supplies will operate
when AC is connected to the drawer, the CB1 circuit breaker for the (A8) power supply
and the CB2 circuit breaker for the (A9) power supply, are turned On and a Low is
provided on the Inhibit Line that connects to J1-6 on the power supplies from the control
board. The CB1 circuit breaker supplies the AC to the (A8) power supply which provides
the +48VDC to the (A1) and (A2) 878 amplifier pallets. The CB2 circuit breaker supplies
the AC to the (A9) power supply which provides the +48VDC to the (A3) and (A4) 878A
amplifier pallets.