User's Manual

Innovator CU0TD-1/CU0RD-1 – CU4TD/CU4RD System Description
ATSC Transmitter/Regenerative Translator
Instruction Manual, Rev. 1 16
located on the rear panel of the tray. The 4 way combiner board supplies a
forward and a reflected power sample to the amplifier control board for metering
and monitoring purposes. In a CU500/600, the typical sample value at J6, a 50Ω
BNC jack located on the front panel of the tray, is approximately 65dB down from
the output power level of the tray. The On Channel RF output of the amplifier
tray is connected to the (A32) pre filter coupler that provides a pre filter forward
sample to a coaxial switch located in (A27) the Remote Interface Assembly. The
output of the pre filter coupler connects through the (A36) a low pass filter, to
(A35) the digital mask filter, the (A37) post filter coupler, the (A37) output
coupler and then to the antenna for your system. The post filter coupler provides
forward and reflected post filter power samples that connect to a coaxial switch
located in (A27) the Remote Interface Assembly. The forward and reflected
power samples are directed to the ON Air exciter by using the remote interface
panel to make the selection. Also included in the system is the Signal Routing
Board (1310948) which controls the RS-485 data connections between the dual
Exciter/Driver Assemblies and the power amplifier tray. Using a relay, which is
controlled by the (A27) remote interface module, connections between the
Exciters and the power amplifier tray are made. Exciter 1 can communicate with
the Power Amplifier Tray or Exciter 2 can communicate with the Power Amplifier
Tray both will not communicate at the same time. Each of the CXB exciters has
an Ethernet controller and a separate Ethernet port that will need wired to the
customer's network
Pre-Filter Sample (Non-Linear Distortion)
The pre-filter sample from the (A32) coupler connects to (A27) the remote
interface module which controls to which exciter the sample connects. The
sample connects to J1, on the (A2 or A12) Axciter relay, in the On Air exciter.
The (A2) relay is controlled by the (A4) Axciter Modulator in exciter 1 and the
(A12) relay is controlled by the (A14) Axciter Modulator in exciter 2 through jack
J7 on the tray. The selected output of the relay at J3, either the Pre or Post filter
sample, connects to the rear panel of the (A1 or A11) exciter/driver assembly at
the BNC Jack J4 that is connected to the downconverter board in the tray for use
in the adaptive equalization process in the Axciter system.
Post-Filter Sample (Linear Distortion)
A forward power sample, after-filtering, from the (A37) coupler at the output of
the DTV filter connects to (A27) the remote interface module which controls to
which exciter the sample connects. The forward sample from the selected On Air
exciter connects to the (A5 or A15) 2 way splitter. One output of the splitter
connects to the system metering board (A3 or A13) for use in the metering and
control circuits in the exciter. The other output of the splitter connects the post
filter forward sample to J2 on the (A2 or A12) Axciter relay in the selected On Air
Exciter. The post filter forward power sample is connected to J2, on the (A2 or
A12) Axciter relay located in the exciter that is selected as ON Air. The (A2)
relay is controlled by the (A4) Axciter Modulator and the (A12) relay is controlled
by the (A14) Axciter Modulator through jack J7 on the tray. The selected output
of the relay, either the Pre or Post filter sample, connects to the rear panel of the
(A1 or A11) driver/amplifier chassis assembly at the BNC Jack J4 that is
connected to the downconverter board for use in the adaptive equalization
process in the Axciter system.