Assembly Instructions Chapter 3

3-kW UHF Transmitter Chapter 3, Installation and Setup Procedures
835-3, Rev. 0 3-5
coaxial cables with BNC connectors on both ends. Connect these cables from the (A9-
A1) splitter to RF input jack J1 on each 600-watt amplifier tray. Also in the installation
material, should be six equal lengths of ½-inch superflex cable with N connectors on
each end. Connect the cables from the output of each amplifier tray at J2 to the 6-way
combiner. Connect the D connector jacks to J3 and J4 on the rear of each 600-watt
amplifier tray.
Caution: After installation, each 600-watt UHF amplifier tray will have a
hardline coaxial cable connected to the rear panel. The tray will not slide out
unless this
connection is first removed.
To pull out the tray for testing, use the extender coaxial cable included in the
installation material kit to connect the tray to the output cable
.
Adjustments to the position of the trays may be necessary and are accomplished by
loosening the cabinet slide mounting bolts that hold the front of the slide to the
mounting frame of the cabinet. Move the trays up or down, as needed, to correct for any
rubbing.
3.4 Main AC Input Connection
Once the cabinets and the trays are in place, the main AC hookup is ready to be made.
Caution: Before connecting the 230 VAC, make certain that all of the circuit
breakers associated with the transmitter are switched off. There are two AC
input circuits to the 3-kW transmitter: one 40 amp to the exciter and one 100
amp to the amplifier cabinet.
The 40-amp, 230-VAC input connections to the exciter cabinet are made to terminal
block TB1 in the AC distribution panel: connect line 1 to TB1-1A, line 2 to TB1-2A, and
ground to TB1-3A. Connect an AC power plug to an unused jack on the AC distribution
panel and connect the other end to J14 on the rear of the exciter tray. The AC to the
UHF exciter tray can be switched off and on using the circuit breaker that is part of the
power entry module on the rear of the tray.
Connect the 100-amp, 230-VAC input to terminal block A10-TB1. This terminal block is
part of the AC distribution assembly, 3-kW amplifier assembly (1245-1300), located
near the center, right-hand side, rear portion of the cabinet. Connect line 1 to TB1-1,
ground to TB1-2, and line 2 to TB1-3. Connect the AC power plugs to an unused jacks
on the AC distribution panel and connect the other end to J4 on the rear of each 600-
watt amplifier tray. The AC to each tray can be switched off and on using the circuit
breakers on the AC distribution panel.
The output of the amplifier assembly connects through (A5) a 1-5/8-inch to 3-1/8-inch
adapter to (A9) a bandpass filter and (A10) an output trap filter assembly. The filtered
output connects through (A11) the output coupler assembly (1020-1002) to the
transmission line that is connected to the antenna system.
This completes the unpacking and installation of the 835-3 3-kW UHF transmitter. Refer
to the operation and setup procedures in the following section before applying power to
the transmitter.