User's Manual

Innovator CU5-1800BTD/BRD ATSC Transmitter/ System Description
Regenerative Translator
Instruction Manual, Rev. 0 37
connected to the (A6) Amplifier Assembly (1312566) that is made up of (A6-A1) the 2
Stage UHF Amplifier Board, CU30 (1308784) and (A6-A2) the RF Module Pallet w/Philips
transistors (1300116). The assembly has approximately 36 dB of gain. The amplified
output at approximately +38 dBm connects to the (A7) Output Detector Board (1308685
or 1312207) which provides forward (2V=100%) and reflected (2V=25%) power
samples to the CU Control Board (1312543) for metering and monitoring purposes. An
output power sample is also supplied to the front panel sample jack J15, which is a 50
Ohm BNC type. The typical sample value in a CU50 is approximately 60dB down from
the output power level of the tray. The RF output is cabled to J2 the “N” connector RF
output jack on the rear panel of the tray. In CU5, CU30, CU50, CU100 and CU125
systems the output connects to a digital mask filter and then the antenna for your
system. In CU250 and CU500 systems, the RF input, from the CU50 driver tray, is
connected to J1 on the rear panel of the amplifier tray. The RF is cabled to J1 on the
Amplifier Heatsink Assembly in the CU250 or CU500 amplifier tray. In CU1000 and
higher power systems the RF is connected to a splitter and then to the inputs of the
CU500 amplifier trays.
The CU250 ATSC system is made up of a CU50 Tray and a 250 Watt ATSC Amplifier
Tray. The CU50 is used as a driver that connects to the 250 Watt Amplifier tray and
supplies the needed drive level to produce the 250 Watts output of the system. The
control and operating parameters of the 250 Watt Amplifier Tray are displayed on the
LCD Screen on the CU50 Tray. In the CU250, the RF input signal at J1 on the amplifier
heatsink assembly is fed to J3 on the LDMOS amplifier pallet. The amplified output of
the pallet, which has approximately 15 dB gain, is connected to the coupler board before
it is cabled to J2 the RF output jack of the Amplifier Heatsink Assembly. The coupler
board supplies a forward and a reflected power sample to the amplifier control board for
metering and monitoring purposes.
The CU500 ATSC system is made up of a CU50 Tray and a 500 Watt Amplifier Tray. The
CU50 is used as a driver that connects to the CU500 Amplifier tray and supplies the
needed drive level to produce the 500 Watts output of the system. The control and
operating parameters of the 500 Watt Amplifier Tray are displayed on the LCD Screen on
the CU50 Tray. In the CU500, the input RF signal at J1, located on the rear panel of the
tray, is fed to J1 on the 4 Way Splitter Board, which supplies four outputs, one to each
878 amplifier pallet. Each amplifier pallet has approximately 14 dB gain. The amplified
outputs of the pallets are combined in the 4 Way combiner board whose output is at J1.
The RF is connected to J2 the 7/16” (1.1cm) Din RF output jack 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, 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.
In higher power systems, multiple amplifier trays are used along with splitters and
combiners to produce the desired output. The CU1000 is made up of a CU50 driver tray,
a two way splitter, two CU500 amplifier trays and a two way combiner. The CU1500 is
made up of a CU50 driver tray, a three way splitter, three CU500 amplifier trays and a
three way combiner. The CU1800 is made up of a CU50 driver tray, a four way splitter,
four CU500 amplifier trays and a four way combiner.
The On Channel RF output of the amplifier tray either connects directly to the low pass
filter and the digital mask filter then to the antenna in single amplifier systems or to a
combiner, the low pass filter and a digital mask filter and finally to the antenna in
multiple amplifier systems.