UBS Axcera LU2000AL Compiled Amplifier Manual
INSTRUCTION MANUAL
Innovator
LX Series
Power Amplifier
Assembly
AXCERA, LLC
103 FREEDOM DRIVE P.O. BOX 525 LAWRENCE, PA 15055-0525 USA
(724) 873-8100 • FAX (724) 873-8105
www.axcera.com • info@axcera.com
LX Series Power Amplifier Assembly Table of Contents
TABLE OF CONTENTS
CHAPTER 1 INTRODUCTION
SECTION PAGE
1.1 Manual Overview ............................................................................ 1-1
1.2 Assembly Designation Numbers ......................................................... 1-1
1.3 Safety........................................................................................... 1-1
1.4 Maintenance.................................................................................. 1-2
1.5 Material Return Procedure................................................................. 1-2
1.6 Limited One-Year Warranty for Axcera Products .................................... 1-3
CHAPTER 2 SYSTEM DESCRIPTION & REMOTE CONTROL CONNECTIONS
2.1 LX Series Power Amplifier Assembly Overview ...................................... 2-1
2.1.1 Power Amplifier Module, 250 Watt ............................................. 2-1
2.1.2 Power Supply Module Assembly................................................. 2-3
2.1.3 Front Panel LCD Display Screens ............................................... 2-3
2.2 System Operation ........................................................................... 2-3
2.2.1 Principles of Operation ............................................................. 2-4
2.3 Customer Remote Connections .......................................................... 2-5
CHAPTER 3 SITE CONSIDERATIONS, INSTALLATION AND SETUP PROCEDURES
3.1 Site Considerations.......................................................................... 3-1
3.2 Unpacking the Chassis w/Modules, bandpass and trap filters .................... 3-4
3.3 Installing the Chassis w/Modules and filters.......................................... 3-4
3.4 AC Input ....................................................................................... 3-5
3.5 Setup and Operation........................................................................ 3-5
3.5.1 Input Connections .................................................................. 3-5
3.5.2 Front Panel Screens for the Exciter/Amplifier Chassis Assembly ....... 3-7
3.5.3 Initial Turn On ......................................................................3-14
CHAPTER 4 CIRCUIT DESCRIPTIONS
4.1 Power Amplifier Module .................................................................... 4-1
4.1.1 UHF Phase/Gain Board ............................................................. 4-1
4.1.2 150 Watt Driver Pallet Assembly................................................ 4-1
4.1.3 150 Watt Driver, Dual Output Board........................................... 4-1
4.1.4 UHF Module Assembly, RF Module Pallet, Philips ........................... 4-2
4.1.5 2 Way UHF Combiner Assembly................................................. 4-2
4.1.6 Amplifier Control Board ............................................................ 4-3
4.2 Power Supply Assembly.................................................................... 4-5
CHAPTER 5 DETAILED ALIGNMENT PROCEDURES
5.1 Module Replacement ........................................................................ 5-1
5.1.1 Initial Test Setup .................................................................... 5-1
5.2 Innovator LX Series Exciter/Amplifier Chassis Assembly .......................... 5-2
5.2.1 Linearity Correction Adjustment ................................................ 5-3
5.2.2 Frequency Response Delay Equalization Adjustment ...................... 5-4
5.2.3 Calibration of Forward Output Power Level................................... 5-4
5.2.4 Calibration of Reflected Output Power Level ................................. 5-5
5.3 Bandpass Filter Assembly ................................................................. 5-5
LX Series, Rev. 0 November 25, 2003 i
LX Series Power Amplifier Assembly Table of Contents
TABLE OF CONTENTS - (Continued)
5.4 UHF Trap Filter Assembly .................................................................. 5-5
5.4.1 The Effects of Tuning the Output Trap Filter ................................. 5-6
APPENDICES
APPENDIX A INNOVATOR LX SERIES SPECIFICATIONS
APPENDIX B DRAWINGS AND PARTS LISTS
LX Series, Rev. 0 November 25, 2003 ii
LX Series Power Amplifier Assembly Table of Contents
LIST OF FIGURES
FIGURE PAGE
3-1 1 kW Minimum Ventilation Configuration ....................................... 3-4
3-2 Front and Rear View Reconnection Drawing ................................... 3-5
3-3 Rear View of LX Series Translator................................................ 3-6
4-1 UHF Amplifier Module, 250 Watts................................................. 4-2
5-1 Typical Red Field Spectrum......................................................... 5-4
LX Series, Rev. 0 iii
LX Series Power Amplifier Assembly Table of Contents
LIST OF TABLES
TABLE PAGE
2-1 LX Series Power Amplifier Assemblies ........................................... 2-1
2-2 Power Amplifier Status Indicators ................................................ 2-3
2-3 Power Amplifier Control Adjustments............................................ 2-3
2-4 Power Amplifier Sample ............................................................. 2-3
2-5 Pioneer Chassis Customer Remote Connections ....................... 2-5
3-1 Rear Chassis Connections for LX Series Translator...........................3-6
3-2 Menu 01 Splash Screen #1......................................................... 3-7
3-3 Menu 02 Splash Screen #2......................................................... 3-7
3-4 Menu 10 Main Screen................................................................ 3-7
3-5 Menu 11 Error List Access Screen ................................................ 3-8
3-6 Menu 12 Translator Device Data Access Screen .............................. 3-8
3-7 Menu 13 Translator Configuration Access Screen............................. 3-8
3-8 Menu 20 Error List Display Screen................................................ 3-8
3-9 Menu 30 Translator Device Details Screen ..................................... 3-9
3-10 Menu 30-1 System Details Screens.............................................. 3-9
3-11 Translator Device Parameters Detail Screens..................................3-9
3-12 Menu 40 Translator Set Up: Power Raise/Lower Screen...................3-10
3-13 Menu 40-1 Translator Set Up: Model Select Screen ........................3-10
3-14 Menu 40-2 Translator Set Up: Frequency Select Screen...................3-11
3-15 Menu 40-3 Translator Set Up: Frequency Table Select Screen...........3-11
3-16 Menu 40-4 Translator Set Up: IF Frequency Screen........................3-11
3-17 Menu 40-5 Translator Set Up: Custom Frequency Select Screen........3-11
3-18 Menu 40-6 Translator Set Up: Xmtr. Set Up Serial Address Screen....3-12
3-19 Menu 40-7 Translator Set Up: Station ID Screen............................3-12
3-20 Menu 40-8 Translator Set Up: System Visual Power Cal. Screen........3-12
3-21 Menu 40-9 Translator Set Up: System Aural Power Cal. Screen.........3-12
3-22 Menu 40-10 Translator Set Up: System Rfltd. Power Cal. Screen.......3-13
3-23 Menu 40-11 Translator Set Up: Fwrd Pwr Fault Threshold Screen......3-13
3-24 Menu 40-12 Translator Set Up: Refl Power Fault Threshold Screen ....3-13
3-25 Menu 40-13 Translator Set Up: Remote Commands Control Screen ...3-13
LX Series, Rev. 0 iv
LX Series Power Amplifier Assembly Chapter 1, Introduction
Chapter 1
Introduction
This manual explains the installation,
setup, alignment, and maintenance
procedures for the Power Amplifier
Assembly for the Innovator LX Series
translator. It is important that you read
all of the instructions, especially the
safety information in this chapter, before
you begin to install or operate the unit.
1.1 Manual Overview
This instruction manual is divided into
five chapters and supporting appendices.
Chapter 1, Introduction, contains
information on the assembly numbering
system used in the manual, safety,
maintenance, return procedures, and
warranties. The second chapter describes
the amplifier assembly and includes
discussions on control and status
indicators and remote control
connections. Chapter 3 explains how to
unpack, install, setup, and operate the
power amplifier assembly. Chapter 4
contains circuit -level descriptions for
boards and board-level components in
the power amplifier. Chapter 5, Detailed
Alignment Procedures, provides
information on adjusting the power
amplifier and the system for optimal
operation. The appendices contain
assembly and subassembly drawings and
parts lists and the system specifications.
1.2 Assembly Designators
Axcera has assigned assembly numbers,
such as Ax (x=1,2,3…), to all assemblie s,
trays, and boards that are referenced in
the text of this manual and shown on the
block diagrams and interconnect
drawings provided in the appendices.
These supporting documents are
arranged in increasing numerical order in
the appendices. Section title s in the text
for assembly or tray descriptions or
alignment procedures contain the
associated part number(s) and the
relevant appendix that contains the
drawings for that item.
1.3 Safety
The translators and associated power
amplifier assemblies manufactured by
Axcera are designed to be easy to use
and repair while providing protection
from electrical and mechanical hazards.
Listed throughout the manual are notes,
cautions, and warnings concerning
possible safety hazards that may be
encountered while operating or servicing
the translator. Please review these
warnings and familiarize yourself with the
operation and servicing procedures
before working on the assembly.
Read All Instructions – All of the
operating and safety instructions should
be read and understood before operating
this equipment.
Retain Manuals – The manuals for the
power amplifier assembly and the
translator should be retained at the
translator site for future reference. We
provide two sets of manuals for this
purpose; one set can be le ft at the office
while one set can be kept at the site.
Heed all Notes, Warnings, and
Cautions – All of the notes, warnings,
and cautions listed in this safety section
and throughout the manual must be
followed.
Follow Instructions – All of the
operating and use instructions for the
amplifier assembly should be followed.
Cleaning – Unplug or otherwise
disconnect all power from the equipment
before cleaning. Do not use liquid or
aerosol cleaners. Use a damp cloth for
cleaning.
LX Series, Rev. 0 1-1
LX Series Power Amplifier Assembly Chapter 1, Introduction
Ventilation – Openings in the cabinets
and modules front panels are provided
for ventilation. To ensure the reliable
operation of the amplifier assembly, and
to protect the unit from overheating,
these openings must not be blocked.
Servicing – Do not attempt to service
this product yourself until becoming
familiar with the equipment. If in doubt,
refer all servicing questions to qualified
Axcera service personnel.
Replacement Parts – When
replacement parts are used, be sure that
the parts have the same functional and
performance characteristics as the
original part. Unauthorized substitutions
may result in fire, electric shock, or other
hazards. Please contact the Axcera
Technical Service Department if you have
any questions regarding service or
replacement parts.
1.4 Maintenance
The LX Series Translator is designed with
components that require little or no
periodic maintenance except for the
routine cleaning of the fans and the front
panels of the modules.
The amount of time between cleanings
depends on the conditions within the
translator room. While the electronics
have been designed to function even if
covered with dust, a heavy buildup of
dust, dirt, or insects will affect the
cooling of the components. This could
lead to a thermal shutdown or the
premature failure of the affected
modules.
When the front panels of the modules
become dust covered, the top covers
should be taken off and any accumulated
foreign material should be removed. A
vacuum cleaner, utilizing a small, wandtype attachment, is an excellent way to
suction out the dirt. Alcohol and other
cleaning agents should not be used
unless you are certain that the solvents
will not damage components or the silk-
screened markings on the modules and
boards. Water-based cleaners can be
used, but do not saturate the
components. The fans and heatsinks
should be cleaned of all dust or dirt to
permit the free flow of air for cooling
purposes.
It is recommended that the operating
parameters of the amplifier assembly and
translator be recorded from the LEDs on
the modules and the LCD system
metering on the control/monitoring
module at least once a month. It is
suggested that this data be retained in a
rugged folder or envelope.
1.5 Material Return Procedure
To insure the efficient handling of
equipment or components that have been
returned for repair, Axcera requests that
each returned item be accompanied by a
Material Return Authorization Number
(MRA#).
An MRA# can be obtained from any
Axcera Field Service Engineer by
contacting the Axcera Field Service
Department at (724) 873-8100 or by fax
at (724) 873-8105. This procedure
applies to all items sent to the Field
Service Department regardless of
whether the item was originally
manufactured by Axcera.
When equipment is sent to the field on
loan, an MRA# is included with the unit.
The MRA# is intended to be used when
the unit is returned to Axcera. In
addition, all shipping material should be
retained for the return of the unit to
Axcera.
Replacement assemblies are also sent
with an MRA# to allow for the proper
routing of the exchanged hardware.
Failure to close out this type of MRA# will
normally result in the customer being
invoiced for the value of the loaner item
or the exchange assembly.
LX Series, Rev. 0 1-2
LX Series Power Amplifier Assembly Chapter 1, Introduction
When shipping an item to Axcera, please
include the MRA# on the packing list and
on the shipping container. The packing
slip should also include contact
information and a brief description of why
the unit is being returned.
Please forward all MRA items to:
AXCERA, LLC
103 Freedom Drive
P.O. Box 525
Lawrence, PA 15055-0525 USA
For more information concerning this
procedure, call the Axcera Field Service
Department.
Axcera can also be contacted through email at info@axcera.com and on the
Web at www.axcera.com.
1.6 Limited One-Year Warranty for
Axcera Products
Axcera warrants each new product that
it has manufactured and sold against
defects in material and workmanship
under normal use and service for a
period of one (1) year from the date of
shipment from Axcera's plant, when
operated in accordance with Axcera's
operating instructions. This warranty
shall not apply to tubes, fuses,
batteries, or bulbs.
Warranties are valid only when and if
(a) Axcera receives prompt written
notice of breach within the period of
warranty, (b) the defective product is
properly packed and returned by the
buyer (transportation and insurance
prepaid), and (c) Axcera determines, in
its sole judgment, that the product is
defective and not subject to any misuse,
neglect, improper installation,
negligence, accident, or (unless
authorized in writing by Axcera) repair
or alteration. Axcera's exclusive liability
for any personal and/or property
damage (including direct, consequential,
or incidental) caused by the breach of
any or all warranties, shall be limited to
the following: (a) repairing or replacing
(in Axcera's sole discretion) any
defective parts free of charge (F.O.B.
Axcera’s plant) and/or (b) crediting (in
Axcera's sole discretion) all or a portion
of the purchase price to the buyer.
Equipment furnished by Axcera, but not
bearing its trade name, shall bear no
warranties other than the special hours of-use or other warranties extended by
or enforceable against the manufacturer
at the time of delivery to the buyer.
NO WARRANTIES, WHETHER
STATUTORY, EXPRESSED, OR
IMPLIED, AND NO WARRANTIES OF
MERCHANTABILITY, FITNESS FOR
ANY PARTICULAR PURPOSE, OR
FREEDOM FROM INFRINGEMENT,
OR THE LIKE, OTHER THAN AS
SPECIFIED IN PATENT LIABILITY
ARTICLES, AND IN THIS ARTICLE,
SHALL APPLY TO THE EQUIPMENT
FURNISHED HEREUNDER.
LX Series, Rev. 0 1-3
LX Series Power Amplifier Assembly Chapter 1, Introduction
FF WARNING!!!
×× HIGH VOLTAGE ØØ
DO NOT ATTEMPT TO REPAIR OR TROUBLESHOOT THIS EQUIPMENT UNLESS
YOU ARE FAMILIAR WITH ITS OPERATION AND EXPERIENCED IN
SERVICING HIGH VOLTAGE EQUIPMENT. LETHAL VOLTAGES ARE PRESENT
WHEN POWER IS APPLIED TO THIS SYSTEM. IF POSSIBLE, TURN OFF
POWER BEFORE MAKING ADJUSTMENTS TO THE SYSTEM.
«« RADIO FREQUENCY RADIATION HAZARD ««
MICROWAVE, RF AMPLIFIERS AND TUBES GENERATE HAZARDOUS RF
RADIATION THAT CAN CAUSE SEVERE INJURY INCLUDING CATARACTS,
WHICH CAN RESULT IN BLINDNESS. SOME CARDIAC PACEMAKERS MAY BE
AFFECTED BY THE RF ENERGY EMITTED BY RF AND MICROWAVE
AMPLIFIERS. NEVER OPERATE THE TRANSLATOR SYSTEM WITHOUT A
PROPERLY MATCHED RF ENERGY ABSORBING LOAD ATTACHED. KEEP
PERSONNEL AWAY FROM OPEN WAVEGUIDES AND ANTENNAS. NEVER LOOK
INTO AN OPEN WAVEGUIDE OR ANTENNA. MONITOR ALL PARTS OF THE RF
SYSTEM FOR RADIATION LEAKAGE AT REGULAR INTERVALS.
LX Series, Rev. 0 1-4
LX Series Power Amplifier Assembly Chapter 1, Introduction
EMERGENCY FIRST AID INSTRUCTIONS
Personnel engaged in the installation, operation, or maintenance of this equipment are urged to become
familiar with the following rules both in theory and practice. It is the duty of all operating personnel to be
prepared to give adequate Emergency First Aid and thereby prevent avoidable loss of life.
RESCUE BREATHING
1. Find out if the person is
breathing.
You must find out if the person
has stopped breathing. If you
think he is not breathing, place
him flat on his back. Put your ear
close to his mouth and look at his
chest. If he is breathing you can
feel the air on your cheek. You
can see his chest move up and
down. If you do not feel the air
or see the chest move, he is not
breathing.
2. If he is not breathing, open
the airway by tilting his head
backwards.
Lift up his neck with one hand
and push down on his forehead
with the other. This opens the
airway. Sometimes doing this will
let the person breathe again by
himself.
SKIN REDDENED: Apply ice cold water to burned
area to prevent burn from going deeper into skin
tissue. Cover area with clean sheet or cloth to keep
away air. Consult a physician.
SKIN BLISTERED OR FLESH CHARRED: Apply ice
cold water to burned area to prevent burn from
going deeper into skin tissue.
3. If he is still not breathing,
begin rescue breathing.
-Keep his head tilted backward.
Pinch nose shut.
-Put your mouth tightly over his
mouth.
-Blow into his mouth once every
five seconds
-DO NOT STOP rescue breathing
until help arrives.
LOOSEN CLOTHING - KEEP
WARM
Do this when the victim is
breathing by himself or help is
available. Keep him as quiet as
possible and from becoming
chilled. Otherwise treat him for
shock.
BURNS
Cover area with clean sheet or cloth to keep away
air. Treat victim for shock and take to hospital.
EXTENSIVE BURN - SKIN BROKEN: Cover area with
clean sheet or cloth to keep away air. Treat victim
for shock and take to hospital.
LX Series, Rev. 0 1-5
LX Series Power Amplifier Assembly Chapter 1, Introduction
dBm, dBw, dBmV, dB µµV, & VOLTAGE
EXPRESSED IN WATTS
50 Ohm System
WATTS PREFIX dBm dBw dBm
V
1,000,000,000,000 1 TERAWATT +150 +120
100,000,000,000 100 GIGAWATTS +140 +110
10,000,000,000 10 GIGAWATTS +130 +100
1,000,000,000 1 GIGAWATT +120 + 99
100,000,000 100 MEGAWATTS +110 + 80
10,000,000 10 MEGAWATTS +100 + 70
1,000,000 1 MEGAWATT + 90 + 60
100,000 100 KILOWATTS + 80 + 50
10,000 10 KILOWATTS + 70 + 40
1,000 1 KILOWATT + 60 + 30
100 1 HECTROWATT + 50 + 20
50 + 47 + 17
20 + 43 + 13
10 1 DECAWATT + 40 + 10
1 1 WATT + 30 0 + 77 +137 7.07V
0.1 1 DECIWATT + 20 - 10 + 67 +127 2.24V
0.01 1 CENTIWATT + 10 - 20 + 57 +117 0.707V
0.001 1 MILLIWATT 0 - 30 + 47 +107 224mV
0.0001 100 MICROWATTS - 10 - 40
0.00001 10 MICROWATTS - 20 - 50
0.000001 1 MICROWATT - 30 - 60
0.0000001 100 NANOWATTS - 40 - 70
0.00000001 10 NANOWATTS - 50 - 80
0.000000001 1 NANOWATT - 60 - 90
0.0000000001 100 PICOWATTS - 70 -100
0.00000000001 10 PICOWATTS - 80 -110
0.000000000001 1 PICOWATT - 90 -120
dBµV VOLTAGE
TEMPERATURE CONVERSION
°°F = 32 + [(9/5) °°C]
°°C = [(5/9) (°°F - 32)]
LX Series, Rev. 0 1-6
LX Series Power Amplifier Assembly Chapter 1, Introduction
USEFUL CONVERSION FACTORS
TO CONVERT FROM TO MULTIPLY BY
mile (US statute) kilometer (km) 1.609347
inch (in) millimeter (mm) 25.4
inch (in) centimeter (cm) 2.54
inch (in) meter (m) 0.0254
foot (ft) meter (m) 0.3048
yard (yd) meter (m) 0.9144
mile per hour (mph) kilometer per hour(km/hr) 1.60934
mile per hour (mph) meter per second (m/s) 0.44704
pound (lb) kilogram (kg) 0.4535924
gallon (gal) liter 3.7854118
U.S. liquid
(One U.S. gallon equals 0.8327 Canadian gallon)
fluid ounce (fl oz) milliliters (ml) 29.57353
British Thermal Unit watt (W) 0.2930711
per hour (Btu/hr)
horsepower (hp) watt (W) 746
NOMENCLATURE OF FREQUENCY BANDS
FREQUENCY RANGE DESIGNATION
3 to 30 kHz VLF - Very Low Frequency
30 to 300 kHz LF - Low Frequency
300 to 3000 kHz MF - Medium Frequency
3 to 30 MHz HF - High Frequency
30 to 300 MHz VHF - Very High Frequency
300 to 3000 MHz UHF - Ultrahigh Frequency
3 to 30 GHz SHF - Superhigh Frequency
30 to 300 GHz EHF - Extremely High Frequency
LETTER DESIGNATIONS FOR UPPER FREQUENCY
BANDS
LETTER FREQ. BAND
L 1000 - 2000 MHz
S 2000 - 4000 MHz
C 4000 - 8000 MHz
X 8000 - 12000 MHz
Ku 12 - 18 GHz
K 18 - 27 GHz
Ka 27 - 40 GHz
V 40 - 75 GHz
W 75 - 110 GHz
LX Series, Rev. 0 1-7
LX Series Power Amplifier Assembly Chapter 1, Introduction
ABBREVIATIONS/ACRONYMS
AC Alternating Current
AFC Automatic Frequency Control
ALC Automatic Level Control
AM Amplitude modulation
AGC Automatic Gain Control
AWG American wire gauge
BER Bit Error Rate
BW Bandwidth
DC Direct Current
D/A Digital to analog
dB Decibel
dBm Decibel referenced to 1 milliwatt
dBmV Decibel referenced to 1 millivolt
dBw Decibel referenced to 1 watt
FEC Forward Error Correction
FM Frequency modulation
Hz Hertz
ICPM Incidental Carrier Phase Modulation
I/P Input
IF Intermediate Frequency
LED Light emitting diode
LSB Lower Sideband
MPEG Motion Pictures Expert Group
O/P Output
PLL Phase Locked Loop
PCB Printed circuit board
QAM Quadrature Amplitude Modulation
LX Series, Rev. 0 1-8
LX Series Power Amplifier Assembly Chapter 1, Introduction
N
RETURN LOSS VS. VSWR
0
-10
-20
R
E
T
U
R
L
O
S
S
-30
dB
-40
-50
-60
-70
1.001 1.01 1.1 2.0
VSWR
LX Series, Rev. 0 1-9
LX Series Power Amplifier Assembly Chapter 2, Amplifier Assembly Description
& Remote Control Connections
Chapter 2
Amplifier Assembly Description & Remote Control Connections
2.1 LX Series Power Amplifier
Assembly Overview
The (A3) power amplifier assembly in the
LX Series contains modular television
amplifiers that slide into the assembly.
There is also needed one external Power
Supply Module Assembly for every two
PA modules, which also slide into the
Power amplifier assembly, under the PA
Modules. Four PA modules and two
Power Supply modules are the maximum
number of modules in a Power Amplifier
Assembly. The RF output of the (A2)
exciter/driver at the “N” connector J25
connects to the power amplifier assembly
at the “N” connector J200. A system
serial cable connects from the Power
Amplifier Assembly at J232 to J34 on the
exciter/driver assembly. If more than
two PA modules are used then another
serial port J233 is also connected to the
Table 2-1: LX Series Power Amplifier Assemblies
ASSEMBLY DESIGNATOR ASSEMBLY NAME PART NUMBER
Chassis Assembly CB001274
A3
Power Supply Assembly 1302893
A11 Coupler Assembly
A4 Visual/Aural Metering Board 1265-1309
2.1.1 Power Amplifier Module
Assembly, 250Watt (1302868;
Appendix B)
The Power Amplifier Module Assembly 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)
Power Amplifier Assembly,
250 Watt
exciter/driver. The output of the
amplifier assembly 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 samples to the
exciter/driver for metering purposes.
The RF output for the translator is at J2
the 7/8” EIA connector on the A11
coupler assembly.
The LX Series power amplifier assembly
is made up of the modules and
assemblies listed in Table 2-1.
1302868
two RF Module Pallets, Philips (1300116),
and (A5) a 2-Way Combiner Board
(1303208).
The Power Amplifier Module contains
Broadband LDMOS amplifiers that cover
the entire UHF band with no tuning
required. Each module amplifies the RF
to a nominal 300W output power.
The Power Amplifier assembly is used to
amplify the RF output of the
Translator/Exciter Driver. A cable,
located on the rear chassis, connects the
RF output from the Exciter/Driver at J25
LX Series, Rev. 0 2-1
LX Series Power Amplifier Assembly Chapter 2, Amplifier Assembly Description
& Remote Control Connections
to J200 the RF input to the PA Assembly.
This module contains RF monitoring
circuitry for both an analog and a digital
system. Control and monitoring lines to
the Power Amplifier module are routed
through the floating blind-mate
connector of the Control &
Monitoring/Power Supply module.
The 100 Watt Translator/Exciter Driver
Power Amplifier module and any
External Amplifier modules contain the
same control and monitoring board.
This board monitors RF output power,
RF reflected power, the current draw of
amplifier sections, the supply voltage,
and the temperature of the PA heat sink.
The RF power detector circuit outputs
vary with operating frequency. These
circuits must be calibrated at their
intended operating frequency. Front
panel adjustment potentiometers are
used to calibrate the following:
Table 1: Power Amplifier Calibration
Adjustments in Analog Systems
R201 Reflected Power Cal
R202 Forward Power Cal
R204 Meter Offset Zero
In analo g systems, the Aural power of
an Exciter Driver Power Amplifier and
the Aural power of any external
amplifier will not be reported by the
system Control Monitoring module.
Additionally the Visual power of these
amplifiers, is reported as Forward Power
just like in digital systems. In analog
systems, aural and visual power will only
be reported for the final system RF
output.
In digital systems, the Forward power of
an Exciter Driver Power Amplifier and
the Forward power of any external
amplifier, is re ported by the system
Control Monitoring module.
If the Control Monitoring module is
monitoring a 5-50 Watt Digital or 10100 Watt Analog Translator, system
power is measured in the Power
Amplifier module. The wired
connections are transferred through the
power supply connector to the
backplane board on a five position
header. All four positions of control
board switch SW1 must be set on to
route these lines as the system's RF
power signals. In systems of output
power greater than 50 Watts digital or
100 Watts aural, system power is
monitored by an external module that is
connected to TB31 and control board
SW1 switches must be set off.
The Forward Power of the
Translator/Exciter Driver Power Amplifier
module is routed to the Upconverter
module as AGC #1. A system overdrive condition is detected when this
value rises above 0.9 VDC. When an
over-drive condition is detected, the
Upconverter module reduces its RF
output level. For values less than 0.9
VDC, the Upconverter uses this voltage
for automatic gain.
LX Series, Rev. 0 2-2
LX Series Power Amplifier Assembly Chapter 2, Amplifier Assembly Description
& Remote Control Connections
Table 2-2. Power Amplifier Status Indicator
LED FUNCTION
ENABLED
(Green)
DC OK
(Green)
TEMP
(Green)
MOD OK
(Green)
Table 2-3. Power Amplifier Control Adjustments
POTENTIOMETERS DESCRIPTION
RFL CAL Adjusts the gain of the Reflected Power monitoring circuit
VISUAL CAL Adjusts the gain of the Visual / Forward Power monitoring circuit
METER ZERO Adjusts the offset of the Forward Power monitoring circuit
Table 2-4. Power Amplifier Sample
DISPLAY FUNCTION
FWD SAMPLE RF sample of the amplified signal being sent out the module on J25.
2.1.2 Power Supply Module
Assembly, 1kW LX Series (1302863;
Appendix B)
The Power Supply Module Assembly is
made up of (A1) a +32V/2000W
Switching Power Supply and (A2) a
±12V/40W Switching Power Supply.
The power supply module provides the
+32 VDC and the +12 VDC and –12 VDC
to the power amplifier module assembly .
2.1.3 Front Panel Display Screens
A 4 x 20 display located on the front of
the Control & Monitoring/Power Supply
Module is used in the LX Series
translator for control of the operation
and display of the operating parameters
of the entire translator.
When lit Green, it indicates that the PA is in the Operate Mode. If a
Mute occurs, the PA will remain Enabled, until the input signal is
returned.
When lit Green, it indicates that the fuse protected DC inputs to the
PA module are OK.
When lit Green, it indicates that the temperature of the heatsink
assembly in the module is below 78C.
When lit Green, it indicates that the PA Module is operating and has
no faults.
2.2 System Operation
When the translator is in operate, as set
by the menu screen located on the
Control & Monitoring Module in the
exciter/driver assembly. The IF
Processor will be enabled, the mute
indicator on the front panel will be
extinguished. The +32 VDC stage of the
Power Supply in the Control & Monitoring
Module is enabled, the operate indicator
on the front panel is lit and the DC OK on
the front panel should also be green.
The enable and DC OK indicators on the
PA Module will also be green.
When the translator is in standby. The IF
Processor will be disabled, the mute
indicator on the front panel will be red.
The +32 VDC stage of the Power Supply
in the Control & Monitoring Module is
disabled, the operate indicator on the
front panel will be extinguished and the
DC OK on the front panel should remain
green. The enable indicator on the PA
Module is also extinguished.
LX Series, Rev. 0 2-3
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