User Manual

LX Series Power Am plifier Assem bly Chapt er 2, Am plifier Assem bly Descript ion
& Rem ot e Cont rol Connect ions
LX Series, Rev. 0 2- 1
Cha pt er 2
Am plifie r Asse m bly De scription & Rem ot e Cont rol Connect ions
2 .1 LX Serie s Pow e r Am plifie r
Assem bly Overview
The (A3) power am plifier assem bly in the
LX Series contains m odular television
am plifiers that slide into the assembly.
There is also needed one external Power
Supply Module Assembly for every two
PA m odules, which also slide into the
Power am plifier assem bly, under the PA
Modules. Four PA m odules and two
Power Supply m odules are the maximum
number of modules in a Power Amplifier
Assem b ly. The RF output of the (A2)
exciter/ driver at the “N” connector J25
connects to the power am plifier assem bly
at the “N” connector J200. A system
serial cable connects from the Power
Am plifier Assem bly at J232 to J34 on the
exciter/ driver assem bly. If more than
two PA modules are used then another
serial port J233 is also connected to the
exciter/ driver. The output of the
am plifier assem bly at the “N” connector
J205 is cabled to A9 the bandpass filter
for the system . The filtered output can
connect to (A10) the Optional 1 section
or 2 section trap filter that provides even
more filtering as needed. The filtered
output is connected to A11 a coupler
assembly that supplies a forward and
reflected sample to the A4 Visual/ Aural
Metering Board. The Visual/ Aural
Metering Board supplies reflected, visual
and aural output power sam ples to the
exciter/ driver for m etering purposes.
The RF output for the transm itter is at J2
the 7/ 8” EIA connector on the A11
coupler assem bly.
The LX Series power amplifier assembly
is m ade up of the m odules and
assemblies listed in Table 2- 1.
Table 2-1: LX Series Power Am plifier Assem blies
ASSEMBLY D ESI GN ATOR ASSEM BLY N AM E PART N UMBER
Chassis Assembly CB001274
A3
Power Am plifier Assembly,
250 Watt
1302868
Power Supply Assem bly 1302893
A11 Coupler Assem bly
A4 Visual/ Aural Metering Board 1265- 1309
2 .1 .1 Pow e r Am plifier M odule
Assem bly, 2 5 0 W a t t ( 1 3 0 2 8 6 8 ;
Appendix B)
The Power Am plifier Module Assem bly is
made up of (A6) an Amplifier Control
Board (1301962), (A1) a UHF Phase/ Gain
Board (1303213), (A2) a 150 Watt Driver
Pallet Assembly (1303293), (A3 & A4)
two RF Module Pallets, Philips (1300116),
and (A5) a 2- Way Combiner Board
(1303208).
The Power Am plifier Module contains
Broadband LDMOS am plifiers that cover
the entire UHF band with no tuning
required. Each module am plifies the RF
to a nominal 300W output power.
The Power Am plifier assem bly is used to
am plify the RF output of the
Transm itter/ Exciter Driver. A cable,
located on the rear chassis, connects the
RF output from the Exciter/ Driver at J25