UBS Axcera LHV60ATD 60-Watt VHF High Band Digital Transmitter User Manual TITLE PAGE

Download:
Mirror Download [FCC.gov]
Document ID	885294
Application ID	vBdQRFJqz/QzFKlgLOSAeA==
Document Description	Driver Users Manual
Short Term Confidential	No
Permanent Confidential	No
Supercede	No
Document Type	User Manual
Display Format	Adobe Acrobat PDF - pdf
Filesize	131.18kB (1639780 bits)
Date Submitted	2008-01-02 00:00:00
Date Available	2008-02-11 00:00:00
Creation Date	2007-12-20 13:57:57
Producing Software	Acrobat PDFWriter 4.05 for Windows NT
Document Lastmod	2008-01-02 14:18:38
Document Title	TITLE PAGE.PDF
Document Creator	TITLE PAGE.doc - Microsoft Word
Document Author:	mountsj

Preliminary Instruction Manual
Innovator,
LX Series
Digital VHF High Band
Driver/Transmitter
w/Axciter Modulator
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
Digital VHF HB Driver/Transmitter
w/Axciter Modulator
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 ..................................................................................................1-2
1.4 Contact Information ......................................................................... 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
2.0 System Overview ..................................................................................2-1
2.1 Exciter Amplifier Chassis Assembly..........................................................2-1
2.1.1 Control & Monitoring/Power Supply Module .....................................2-2
2.1.2 Driver Power Amplifier Module, VHF, DTV .......................................2-3
2.1.2.1 Power Amplifier Module, DTV/DVB, VHF.................................2-5
2.2 RF Output Assemblies ............................................................................2-6
2.2.1 Pre-Filter Sample and Post-Filter Sample ........................................2-7
2.3 Control and Status.................................................................................2-7
2.3.1 Front Panel LCD Display Screen .....................................................2-7
2.4 System Operation..................................................................................2-7
2.4.1 Principles of Operation ..................................................................2-7
2.5 Maintenance .........................................................................................2-8
2.6 Customer Remote Connections ......................................................... 2-9
CHAPTER 3 SITE CONSIDERATIONS, INSTALLATION AND SETUP PROCEDURES
3.1
3.2
3.3
3.4
3.5
Site Considerations................................................................................3-1
Unpacking the Chassis w/Modules ...........................................................3-5
Installing the Chassis w/Modules.............................................................3-5
AC Input...............................................................................................3-6
Setup and Operation..............................................................................3-7
3.5.1 Input Connections ........................................................................3-7
3.5.2 Initial Turn On .............................................................................3-8
3.5.2.1 Axciter Upconverter Module LEDs on Front Panel ....................3-8
3.5.2.2 Controller Module LEDs on Front Panel ..................................3-9
3.5.2.3 Driver Power Amplifier Module LEDs on Front Panel ................3-9
3.5.3 Front Panel Screens for the Driver/Amplifier Chassis Assembly..........3-9
3.5.4 Operational Procedure ................................................................ 3-15
CHAPTER 4 CIRCUIT DESCRIPTIONS
4.1 Control Monitoring/Power Supply Module .................................................4-1
4.1.1 Power Protection Board .................................................................4-1
4.1.2 Control Board ..............................................................................4-2
4.1.2.1 Schematic Page 1................................................................4-2
4.1.2.2 Schematic Page 2................................................................4-3
4.1.2.3 Schematic Page 3................................................................4-3
4.1.2.4 Schematic Page 4................................................................4-3
4.1.2.5 Schematic Page 5................................................................4-3
4.1.3 Switch Board ...............................................................................4-4
LX Series, Digital, Rev. 0
November 15, 2007
Digital VHF HB Driver/Transmitter
w/Axciter Modulator
Table of Contents
TABLE OF CONTENTS - (Continued)
SECTION
PAGE
4.1.4 Switching Power Supply Assembly..................................................4-4
4.2 Driver Power Amplifier Module Assembly, VHF, DTV ..................................4-4
4.2.1 25 Watt VHF Pallet Assembly.........................................................4-5
4.2.2 200 Watt VHF Amplifier Pallet Assembly .........................................4-5
4.2.3 Coupler Board Assembly ...............................................................4-5
4.2.4 VHF Amplifier Control Board ..........................................................4-5
4.2.4.1 Schematic Page 1................................................................4-6
4.2.4.2 Schematic Page 2................................................................4-6
4.2.4.3 Schematic PG 2, Current Monitoring Sections of the Board ......4-7
4.2.4.4 Schematic Page 3................................................................4-7
4.3 Power Amplifier Module Assembly, DTV/DVB, VHF ....................................4-8
4.3.1 25 Watt VHF Pallet Assembly.........................................................4-8
4.3.2 200 Watt VHF Amplifier Pallet Assembly .........................................4-8
4.3.3 Coupler Board Assembly ...............................................................4-8
4.3.4 VHF, DVB Amplifier Control Board ..................................................4-8
4.3.4.1 Schematic Page 1................................................................4-9
4.3.4.2 Schematic Page 2................................................................4-9
4.3.4.3 Schematic PG 2, Current Monitoring Sections of the Board .... 4-10
4.3.4.4 Schematic Page 3.............................................................. 4-10
CHAPTER 5 DETAILED ALIGNMENT PROCEDURES
5.1 System Preparation ...............................................................................5-1
5.1.1 Module Replacement.....................................................................5-1
5.2 Initial Test Set Up of the Transmitter .......................................................5-1
5.3 Setting Up the Output Power of the Transmitter using Axciter ....................5-2
5.3.1 Adjusting Forward Power Readings.................................................5-2
5.3.2 Setting Up of AGC ........................................................................5-2
5.3.2.1 Setting Up of AGC 1 ............................................................5-2
5.3.2.2 Setting Up of AGC 2 ............................................................5-3
5.3.3 Setting Up of Overdrive Threshold..................................................5-3
5.3.4 Axciter Relay Sample Values .........................................................5-3
5.3.5 Upconverter/Downconverter Adjustment ........................................5-4
5.4 System Calibration of Forward & Reflected w/Driver/Amplifier LCD Display ..5-4
5.4.1 Forward Power Calibration.............................................................5-4
5.4.2 Reflected Power Calibration ...........................................................5-4
APPENDIX
APPENDIX A DRAWINGS
APPENDIX B SPECIFICATIONS
LX Series, Digital, Rev. 0
ii
November 15, 2007
Digital VHF HB Driver/Transmitter
w/Axciter Modulator
Table of Contents
LIST OF FIGURES
FIGURE
1-1
PAGE
Brady Marker Identification Drawing.................................................1-1
2-1
2-2
Digital LX Series Driver/Amplifier Front View Modules.........................2-1
Rear View LX Series Chassis Assembly..............................................2-9
3-1
3-2
3-3
3-4
3-5
500 Minimum Ventilation Configuration.............................................3-4
Tray Slide Cabinet Mounting Diagram ...............................................3-6
Front and Rear View Reconnection Drawing.......................................3-6
AC Input Box Assembly...................................................................3-7
Rear View of LX Driver/Amplifier Chassis Assembly ............................3-7
5-1
Axciter Upconverter/Downconverter Main Screen...............................5-3
LX Series, Digital, Rev. 0
iii
Digital VHF HB Driver/Transmitter
w/Axciter Modulator
Table of Contents
LIST OF TABLES
TABLE
2-1
2-2
2-3
2-4
2-5
2-6
2-7
2-8
2-9
2-10
2-11
PAGE
Digital LX Series Driver/Amplifier Assembly and Modules ....................2-1
Controller/Power Supply Front Panel Display .....................................2-2
Controller/Power Supply Front Panel Status Indicators .......................2-2
Controller/Power Supply Front Panel Control Adjustments...................2-2
Driver Power Amplifier Front Panel Status Indicators ..........................2-4
Driver Power Amplifier Front Panel Control Adjustments .....................2-4
Driver Power Amplifier Front Panel Sample........................................2-4
Power Amplifier Front Panel Status Indicators....................................2-6
Power Amplifier Front Panel Control Adjustments...............................2-6
Power Amplifier Front Panel Sample .................................................2-6
LX Series Driver/Amplifier Customer Remote Connections ..... 2-10
3-1
LX Series Digital Transmitters AC Input and Current Requirements......3-1
3-2
Rear Chassis Connections for LX Series Digital Driver/Amplifier ...........3-8
Digital Driver/Amplifier System Controller Screens
3-3
Menu 01 Splash Screen #1..............................................................3-9
3-4
Menu 02 Splash Screen #2............................................................ 3-10
3-5
Menu 10 Main Screen ................................................................... 3-10
3-6
Menu 11 Error List Screen ............................................................. 3-10
3-7
Menu 12 Transmitter Device Data Access Screen ............................. 3-10
3-8
Menu 13 Transmitter Configuration Access Screen ........................... 3-11
3-9
Menu 20 Error List Display Screen .................................................. 3-11
3-10
Menu 30 Transmitter Device Details Screen .................................... 3-11
3-11
Menu 30-1 System Details Screen.................................................. 3-11
3-12
Transmitter Device Parameters Detail Screens................................. 3-12
3-13
Menu 40 Authorized Personnel Screen ............................................ 3-12
3-14
Menu 40-1 Transmitter Set-Up: Power Control Screen...................... 3-13
3-15
Menu 40-3 Transmitter Set-Up: Model Select Screen ....................... 3-13
3-16
Menu 40-5 Transmitter Set-Up: Serial Address Screen ..................... 3-14
3-17
Menu 40-6 Transmitter Set-Up: System Forward Power Calibration ... 3-14
3-18
Menu 40-9 Transmitter Set-Up: System Reflected Power Calibration.. 3-14
3-19
Menu 40-13 Transmitter Set-Up: Min Forward Power Fault Threshold 3-14
3-20
Menu 40-14 Transmitter Set-Up: Max Reflected Pwr Fault Threshold . 3-14
3-21
Menu 40-19 Transmitter Set-Up: Amplifier Output Power Warning..... 3-15
3-22
Menu 40-19 Transmitter Set-Up: Remote Commands Control Screen. 3-15
LX Series, Digital, Rev. 0
iv
Digital VHF HB Driver/Transmitter
w/Axciter Modulator
Chapter 1, Introduction
Chapter 1
Introduction
1.1: Manual Overview
This manual explains the installation,
setup, alignment, and maintenance
procedures for the LX Series modular
Digital VHF High Band driver/transmitter.
If your transmitter contains external
power amplifier assemblies, then
information and drawings on the external
amplifier assemblies are contained in
Volume 2. NOTE: Information on the
Axciter Modulator, the Upconverter Sled
and the Downconverter Sled are
contained in the separate Axciter Manual.
This instruction manual is divided into five
chapters and supporting appendix.
Chapter 1, Introduction, contains
information on the assembly numbering
system used in the manual, safety,
maintenance, return procedures, and
warranties. Chapter 2, system
description, maintenance and remote
control connections, describes the
transmitter and includes discussions on
system control and status indicators,
maintenance and remote control
connections. Chapter 3, site
considerations, installation and setup
procedures, explains how to unpack,
install, setup, and operate the transmitter.
Chapter 4, circuit descriptions, contains
circuit-level descriptions for boards and
board-level components in the
transmitter. Chapter 5, Detailed
Alignment Procedures, provides
information on adjusting the system
assemblies for optimal operation.
Appendix A contains drawings and parts
lists.
and boards in the system. These
designations are referenced in the text of
this manual and shown on the block
diagrams and interconnect drawings
provided in the appendices. The Block
Diagrams, Interconnects, Schematics,
Assembly Drawings and Parts Lists are
arranged in increasing numerical order in
the appendices. Section titles in the text
for assembly or module descriptions or
alignment procedures contain the
associated part number(s) and the
relevant appendix that contains the
drawings for that item.
The cables that connect between the
boards within a tray or assembly and
that connect between the trays, racks
and cabinets are labeled using Brady
markers. Figure 1-1 is an example of a
Brady marked cable. There may be as
few as two or as many as four Markers
on any one cable. These Brady markers
are read starting furthest from the
connector. If there are four Brady
Markers, this marker is the transmitter
number such as transmitter 1 or
transmitter 2. The next or the furthest
Brady Marker is the rack or cabinet
number on an interconnect cable or the
board number within a tray. The next
number on an interconnect cable is the
Tray location or number. The Brady
marker closest to the connector is the
jack or connector number on an
interconnect cable or the jack or
connector number on the board within a
tray.
1.2: Assembly Designators
Figure 1-1: Brady Marker Identification
Drawing
Axcera has assigned assembly numbers,
Ax designations such as A1, where
x=1,2,3…etc, to all assemblies, modules,
LX Series, Digital, Rev. 0
1-1
Digital VHF HB Driver/Transmitter
w/Axciter Modulator
Chapter 1, Introduction
1.3: Safety
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.
The VHF transmitter systems
manufactured by Axcera are designed to
be easy to use and repair while providing
protection from electrical and mechanical
hazards. Please review the following
warnings and familiarize yourself with the
operation and servicing procedures
before working on the transmitter
system.
1.4: Contact Information
Read All safety Instructions – All of
the safety instructions should be read
and understood before operating this
equipment.
The Axcera Field Service Department can
be contacted by phone at (724) 8738100 or by fax at (724) 873-8105.
Retain Manuals – The manuals for the
transmitter should be retained at the
transmitter site for future reference.
Axcera provides two sets of manuals for
this purpose; one set can be left at the
office while one set can be kept at the
site.
Before calling Axcera, please be prepared
to supply the Axcera technician with
answers to the following questions. This
will save time and help ensure the most
direct resolution to the problem.
1. What are the Customers’ Name
and call letters?
2. What are the model number and
type of transmitter?
3. Is the transmitter digital or
analog?
4. How long has the transmitter
been on the air? (Approximately
when was the transmitter
installed.)
5. What are the symptoms being
exhibited by the transmitter?
Include the current control/power
supply LCD readings and the
status of LEDs on the front
panels of the modules. If
possible, include the
control/power supply LCD
readings before the problem
occurred.
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 Operating Instructions – All of
the operating and use instructions for the
transmitter 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.
Ventilation – Openings in the cabinet
and module front panels are provided for
ventilation. To ensure the reliable
operation of the driver/transmitter, and
to protect the unit from overheating,
these openings must not be blocked.
1.5: Return Material 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
Return Material Authorization Number
(RMA#).
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.
LX Series, Digital, Rev. 0
1-2
Digital VHF HB Driver/Transmitter
w/Axciter Modulator
Chapter 1, Introduction
The RMA# 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.
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, bulbs or LEDs.
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.
When equipment is sent to the field on
loan, an RMA# is included with the unit.
The RMA# 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 RMA# to allow for the proper
routing of the exchanged hardware.
Failure to close out this type of RMA# will
normally result in the customer being
invoiced for the value of the loaner item
or the exchanged assembly.
When shipping an item to Axcera, please
include the RMA# 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 RMA items to:
Equipment furnished by Axcera, but not
bearing its trade name, shall bear no
warranties other than the special hoursof-use or other warranties extended by
or enforceable against the manufacturer
at the time of delivery to the buyer.
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 @ (724) 873-8100.
Axcera can also be contacted through email at info@axcera.com and on the
Web at www.axcera.com.
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.
1.6: Limited One Year Warranty for
Axcera Products
Axcera warrants each new product that
it has manufactured and sold against
LX Series, Digital, Rev. 0
1-3
Digital VHF HB Driver/Transmitter
w/Axciter Modulator
Chapter 1, Introduction
F WARNING!!!
× HIGH VOLTAGE Ø
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 TRANSMITTER 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, Digital, Rev. 0
1-4
Digital VHF HB Driver/Transmitter
w/Axciter Modulator
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.
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
WARM
CLOTHING
KEEP
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
SKIN REDDENED: Apply ice cold water to burned
area to prevent burn from going deeper into skin
tissue. Cover area with a 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.
LX Series, Digital, Rev. 0
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.
1-5
Digital VHF HB Driver/Transmitter
w/Axciter Modulator
Chapter 1, Introduction
dBm, dBw, dBmV, dBµV, & VOLTAGE
EXPRESSED IN WATTS
50 Ohm System
WATTS
1,000,000,000,000
100,000,000,000
10,000,000,000
1,000,000,000
100,000,000
10,000,000
1,000,000
100,000
10,000
1,000
100
50
20
10
0.1
0.01
0.001
0.0001
0.00001
0.000001
0.0000001
0.00000001
0.000000001
0.0000000001
0.00000000001
0.000000000001
PREFIX
1 TERAWATT
100 GIGAWATTS
10 GIGAWATTS
1 GIGAWATT
100 MEGAWATTS
10 MEGAWATTS
1 MEGAWATT
100 KILOWATTS
10 KILOWATTS
1 KILOWATT
1 HECTROWATT
1 DECAWATT
1 WATT
1 DECIWATT
1 CENTIWATT
1 MILLIWATT
100 MICROWATTS
10 MICROWATTS
1 MICROWATT
100 NANOWATTS
10 NANOWATTS
1 NANOWATT
100 PICOWATTS
10 PICOWATTS
1 PICOWATT
dBm
+150
+140
+130
+120
+110
+100
+ 90
+ 80
+ 70
+ 60
+ 50
+ 47
+ 43
+ 40
+ 30
+ 20
+ 10
- 10
- 20
- 30
- 40
- 50
- 60
- 70
- 80
- 90
dBw
+120
+110
+100
+ 99
+ 80
+ 70
+ 60
+ 50
+ 40
+ 30
+ 20
+ 17
+ 13
+ 10
- 10
- 20
- 30
- 40
- 50
- 60
- 70
- 80
- 90
-100
-110
-120
dBmV
dBµV
VOLTAGE
+137
+127
+117
+107
7.07V
2.24V
0.707V
224mV
77
67
57
47
TEMPERATURE CONVERSION
°F = 32 + [(9/5) °C]
°C = [(5/9) (°F - 32)]
LX Series, Digital, Rev. 0
1-6
Digital VHF HB Driver/Transmitter
w/Axciter Modulator
Chapter 1, Introduction
USEFUL CONVERSION FACTORS
TO CONVERT FROM
TO
MULTIPLY BY
mile (US statute)
kilometer (km)
inch (in)
millimeter (mm)
inch (in)
centimeter (cm)
inch (in)
meter (m)
foot (ft)
meter (m)
yard (yd)
meter (m)
mile per hour (mph)
kilometer per hour(km/hr)
mile per hour (mph)
meter per second (m/s)
pound (lb)
kilogram (kg)
gallon (gal)
liter
U.S. liquid
(One U.S. gallon equals 0.8327 Canadian gallon)
fluid ounce (fl oz)
milliliters (ml)
British Thermal Unit
watt (W)
horsepower (hp)
watt (W)
1.609347
25.4
2.54
0.0254
0.3048
0.9144
1.60934
0.44704
0.4535924
3.7854118
29.57353
0.2930711
per hour (Btu/hr)
746
NOMENCLATURE OF FREQUENCY BANDS
FREQUENCY RANGE
DESIGNATION
3 to 30 kHz
30 to 300 kHz
300 to 3000 kHz
3 to 30 MHz
30 to 300 MHz
300 to 3000 MHz
3 to 30 GHz
30 to 300 GHz
VLF
LF
MF
HF
VHF
UHF
SHF
EHF
Very Low Frequency
Low Frequency
Medium Frequency
High Frequency
Very High Frequency
Ultrahigh Frequency
Superhigh Frequency
Extremely High Frequency
LETTER DESIGNATIONS FOR UPPER FREQUENCY
BANDS
LETTER
FREQ. BAND
Ku
Ka
LX Series, Digital, Rev. 0
1000 - 2000 MHz
2000 - 4000 MHz
4000 - 8000 MHz
8000 - 12000 MHz
12 - 18 GHz
18 - 27 GHz
27 - 40 GHz
40 - 75 GHz
75 - 110 GHz
1-7
Digital VHF HB Driver/Transmitter
w/Axciter Modulator
Chapter 1, Introduction
RETURN LOSS VS. VSWR
-10
-20
-30
N dB
-40
-50
-60
-70
1.001
1.01
1.1
VSWR
LX Series, Digital, Rev. 0
1-8
2.0
Digital VHF HB Driver/Transmitter
w/Axciter Modulator
Chapter 1, Introduction
ABBREVIATIONS/ACRONYMS
AC
Alternating Current
FEC
Forward Error Correction
AFC
Automatic Frequency Control
FM
Frequency modulation
ALC
Automatic Level Control
FPGA
Field Programmable Gate Array
AM
Amplitude modulation
Hz
Hertz
AGC
Automatic Gain Control
ICPM
Incidental Carrier Phase Modulation
AWG
American wire gauge
I/P
Input
BER
Bit Error Rate
IF
Intermediate Frequency
BW
Bandwidth
LED
Light emitting diode
DC
Direct Current
LSB
Lower Sideband
D/A
Digital to analog
MPEG
Motion Pictures Expert Group
DSP
Digital Signal Processing
O/P
Output
DTV
Digital Television
PLL
Phase Locked Loop
dB
Decibel
PCB
Printed circuit board
dBm
Decibel referenced to 1 milliwatt
QAM
Quadrature Amplitude Modulation
dBmV
Decibel referenced to 1 millivolt
SMPTE Society of Motion Picture and
Television Engineers
dBw
Decibel referenced to 1 watt
LX Series, Digital, Rev. 0
VSB
1-9
Vestigial Side Band
Digital VHF HB Driver/Transmitter
w/Axciter Modulator
Chapter 2, System Description &
Remote Control Connections
Chapter 2
System Description & Remote Control Connections
A1
A5
A4
A6
Figure 2-1: Driver/Amplifier Chassis Assembly w/external Axciter Front View Modules
Table 2-1: Digital Driver/Amplifier Chassis Modules w/external Axciter
ASSEMBLY DESIGNATOR
MODULE/ASSEMBLY NAME
PART NUMBER
Chassis Assembly, HX-E
1307716 (220 VAC)
A1
Axciter Downconverter Module
1306852
Control & Monitoring/Power Supply
A4
1303229 (220 VAC)
Module
A5
Axciter Upconverter Module
1306850
Driver Amplifier Module, VHF (Used
A6
1305822
with High Power transmitter)
Power Amplifier Module, VHF (Used
Or A6
1309218
with LHV50/60ATD)
A11
Backplane Board, HX Series
1307307
2.0: System Overview
listed in Table 2-1 and shown in Figure
2-1.
The LX Series systems are complete
Digital VHF modular television
transmitters that operate at an average
output power of 5 Watts to 60 Watts, but
they can also be used as a driver. When
used as a driver, it operates at the
needed drive level to produce the
desired output power level of the
external PA Assembly or Assemblies.
2.1: Exciter Amplifier Chassis
Assembly, HX-E, 220 VAC (1307716;
Appendix A)
The chassis assembly is factory set for
operation using 220 VAC. All of the
modules, except the power amplifier
module and the power supply section of
the Control & Monitoring/Power Supply
Module, plug directly into a backplane
board. The backplane board (1307307)
provides module to module
interconnection as well as interconnection
to remote command and control
connectors.
The model number scheme for a
Innovator LX Series transmitter is as
follows (where #### = power in
watts):
LHV####ATD - LX Series VHF Digital
Xmtr
(Example): LHV50ATD is a 50 Watt
Digital VHF High Band Xmtr
NOTE: Description of the Axciter
Downconverter Module, Upconverter
Module and Axciter Modulator Tray are
found in the separate Axciter Manual.
The LX Series digital transmitter is made
up of the modules and assemblies as
LX Series, Digital, Rev. 0
2-1
Digital VHF HB Driver/Transmitter
w/Axciter Modulator
Chapter 2, System Description &
Remote Control Connections
2.1.1: (A4) Control & Monitoring/
Power Supply Module Assembly,
220VAC (1303229; Appendix A)
Board (1302837) and a Switch Board
(1527-1406). The Assembly also
contains a switching power supply that
provides ±12 VDC to the rest of the
modules in the chassis and +32 VDC to
the Power Amplifier module.
The Assembly provides all transmitter
control and monitoring functions. The
Front panel LCD allows monitoring of
system parameters, including forward
and reflected power, transistor currents,
module temperatures and power supply
voltages.
The (A4) Control & Monitoring/Power
Supply Assembly is made up of a Control
Board (1302021), a Power Protection
Table 2-2: Controller/Power Supply Display
DISPLAY
FUNCTION
A 4 x 20 display providing a four-line readout of the internal
LCD
functions, external inputs, and status. See Chapter 3,
Controller/Power Supply Display Screens, for a listing of displays.
Table 2-3: Controller/Power Supply Status Indicator
LED
FUNCTION
When lit it indicates that the transmitter is in the Operate Mode. If
OPERATE
transmitter is Muted the Operate LED will stay lit, the transmitter
( green )
will remain in Operate, until the input signal is returned.
Red indicates that a problem has occurred in the transmitter. The
FAULT
transmitter will be Muted or placed in Standby until the problem is
( red or green )
corrected.
DC OK
Green indicates that the switchable fuse protected DC outputs that
( red or green )
connect to the modules in the transmitter are OK.
Table 2-4: Controller/Power Supply Control Adjustments
DESCRIPTION
POTENTIOMETERS
DISPLAY CONTRAST Adjusts the contrast of the display for desired viewing of screen.
LX Series, Digital, Rev. 0
2-2
Digital VHF HB Driver/Transmitter
w/Axciter Modulator
Chapter 2, System Description &
Remote Control Connections
2.1.2: (A6) Driver Power Amplifier
Module Assembly, VHF, DTV
(1305822; Appendix A)
the LO/Upconverter at J23 to J24 the RF
input to the PA Assembly.
The Power Amplifier module contains an
amplifier control and monitoring board.
This board monitors the RF output
power, RF reflected power, the current
draw of amplifier sections, the supply
voltage, and the temperature of the PA
heat sink. The Control and monitoring
lines to the Power Amplifier module are
routed through the floating blind-mate
connector of the Control &
Monitoring/Power Supply module.
NOTE: The 1305822 Driver PA
Assembly is used as a driver for high
power transmitters. Refer to the
1309218 PA Assembly, which follows
in the next section, for the PA used
in the LHV50ATD & LHV60ATD
transmitters.
The RF power detector circuit outputs
vary with operating frequency. These
circuits must be calibrated at their
intended operating frequency. Front
panel adjustment potentiometers, R201
for Reflected Power and R202 for
Forward Power, are used for calibration.
The (A6) Power Amplifier Module
Assembly is made up of a VHF Coupler
Board Assembly (1308258), an Amplifier
Control Board (1308260), a Delta RF 25
Watt VHF Driver Assembly (1305820)
and a Delta RF 200 Watt VHF Amplifier
Assembly (1300167).
The Aural power of the Power Amplifier
assembly is not reported by the system
Control Monitoring module. Additionally
the Visual power of the amplifier is
reported as Forward Power.
The Forward Power of the Power
Amplifier module is routed to the
Upconverter module as AGC #1. A
system over-drive condition is detected
when this value rises above 1.6 VDC on
the Axciter’s Upconverter Screen. When
an over-drive condition is detected, the
Upconverter module reduces its RF
output level. For values less than 1.6
VDC, the Upconverter uses this voltage
for automatic gain.
The Power Amplifier Module contains
Broadband LDMOS amplifiers that cover
the VHF High Band with no tuning
required. They amplify the RF to the
output power of the transmitter.
The Power Amplifier is used to amplify
the RF output of the Upconverter
module. A jumper cable, located on the
rear chassis, connects the RF output from
LX Series, Digital, Rev. 0
2-3
Digital VHF HB Driver/Transmitter
w/Axciter Modulator
Chapter 2, System Description &
Remote Control Connections
Table 2-5: Power Amplifier Status Indicator
LED
FUNCTION
When lit Green, it indicates that the PA is in the Operate Mode. If a
ENABLED
Mute occurs, the PA will remain Enabled, until the input signal is
(Green)
returned.
DC OK
When lit Green, it indicates that the fuse protected DC inputs to the
(Green)
PA module are OK.
TEMP
When lit Green, it indicates that the temperature of the heatsink
(GREEN)
assembly in the module is below 78°C.
MOD OK
When lit Green, it indicates that the PA Module is operating and has
(Green)
no faults.
If the Module OK LED is Red and blinking a fault is present. The
meaning of the blinking LED is as follows.
MOD OK
(RED)
MOD OK
(Amber)
1 Blink indicates Amplifier Current Fault.
2 Blinks indicate Temperature Fault.
3 Blinks indicate +32V Power Supply Over Voltage Fault.
4 Blinks indicate +32V Power Supply Under Voltage Fault.
5 Blinks indicate Reflected Power Fault.
6 Blinks indicate +12V or –12V Power Supply Fault
A blinking Amber Mod OK LED indicates the power output of the
amplifier module is below 65%. (NOTE: Only in Amplifier Code
Versions 3.7A or later & System Controller Code Versions 3.9C or
later.)
Table 2-6: Power Amplifier Control Adjustments
POTENTIOMETERS
DESCRIPTION
RFL CAL
Adjusts the gain of the Reflected Power monitoring circuit
FORWARD CAL
Adjusts the gain of the Forward Power monitoring circuit
AURAL CAL
(NOT USED) Adjusts the gain of the Aural Power monitoring circuit
(NOT USED) Adjusts the offset of the Forward Power monitoring
AURAL NULL
circuit based on the Aural signal level..
Table 2-7: Power Amplifier Sample
DISPLAY
FUNCTION
FWD SAMPLE
RF sample of the amplified signal being sent out the module on J25.
LX Series, Digital, Rev. 0
2-4
Digital VHF HB Driver/Transmitter
w/Axciter Modulator
Chapter 2, System Description &
Remote Control Connections
2.1.2.1: (A6) Power Amplifier
Assembly, DTV/DVB, VHF
(1309218; Appendix A)
The Power Amplifier module contains an
amplifier control and monitoring board.
This board monitors the RF output
power, RF reflected power, the current
draw of amplifier sections, the supply
voltage, and the temperature of the PA
heat sink. The 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 RF power detector circuit outputs
vary with operating frequency. These
circuits must be calibrated at their
intended operating frequency. Front
panel adjustment potentiometers, R201
for Reflected Power and R202 for
Forward Power, are used for calibration.
NOTE: The 1309218 PA Assembly is
used in the LHV50ATD & LHV60ATD
Transmitters. Refer to the 1305822
Driver PA Assembly, which is in the
previous section, for the driver PA
used in high power transmitters.
The Aural power of the Power Amplifier
assembly is not reported by the system
Control Monitoring module. Additionally
the Visual power of the amplifier is
reported as Forward Power.
The (A6) Power Amplifier Module
Assembly is made up of a VHF HB
Coupler Board Assembly (1308258), an
Amplifier Control Board (1309216), a
Delta RF 25 Watt VHF Driver Assembly
(1305820) and a Delta RF 200 Watt VHF
Amplifier Assembly (1300167).
The Forward Power of the Power
Amplifier module is routed to the
Upconverter module as AGC #1. A
system over-drive condition is detected
when this value rises above 1.6 VDC on
the Axciter’s Upconverter Screen. When
an over-drive condition is detected, the
Upconverter module reduces its RF
output level. For values less than 1.6
VDC, the Upconverter uses this voltage
for automatic gain.
The Power Amplifier Module contains
Broadband LDMOS amplifiers that cover
the VHF High Band with no tuning
required. They amplify the RF to the
output power of the transmitter.
The Power Amplifier is used to amplify
the RF output of the Upconverter
module. A jumper cable, located on the
rear chassis, connects the RF output from
the LO/Upconverter at J23 to J24 the RF
input to the PA Assembly.
LX Series, Digital, Rev. 0
2-5
Digital VHF HB Driver/Transmitter
w/Axciter Modulator
Chapter 2, System Description &
Remote Control Connections
Table 2-8: Power Amplifier Status Indicator
LED
FUNCTION
When lit Green, it indicates that the PA is in the Operate Mode. If a
ENABLED
Mute occurs, the PA will remain Enabled, until the input signal is
(Green)
returned.
DC OK
When lit Green, it indicates that the fuse protected DC inputs to the
(Green)
PA module are OK.
TEMP
When lit Green, it indicates that the temperature of the heatsink
(GREEN)
assembly in the module is below 78°C.
MOD OK
When lit Green, it indicates that the PA Module is operating and has
(Green)
no faults.
If the Module OK LED is Red and blinking a fault is present. The
meaning of the blinking LED is as follows.
MOD OK
(RED)
MOD OK
(Amber)
1 Blink indicates Amplifier Current Fault.
2 Blinks indicate Temperature Fault.
3 Blinks indicate +32V Power Supply Over Voltage Fault.
4 Blinks indicate +32V Power Supply Under Voltage Fault.
5 Blinks indicate Reflected Power Fault.
6 Blinks indicate +12V or –12V Power Supply Fault
A blinking Amber Mod OK LED indicates the power output of the
amplifier module is below 65%. (NOTE: Only in Amplifier Code
Versions 3.7A or later & System Controller Code Versions 3.9C or
later.)
Table 2-9: Power Amplifier Control Adjustments
POTENTIOMETERS
DESCRIPTION
RFL CAL
Adjusts the gain of the Reflected Power monitoring circuit
FORWARD CAL
Adjusts the gain of the Forward Power monitoring circuit
AURAL CAL
(NOT USED) Adjusts the gain of the Aural Power monitoring circuit
(NOT USED) Adjusts the offset of the Forward Power monitoring
AURAL NULL
circuit based on the Aural signal level..
Table 2-10: Power Amplifier Sample
DISPLAY
FUNCTION
FWD SAMPLE
RF sample of the amplified signal being sent out the module on J25.
2.2: RF Output Assemblies
filter and then to J1, the RF input jack,
on (A8) the DTV bandpass filter. The
low pass and bandpass filtered output
connects to the (A9) coupler and then to
(A11) the post-filter coupler assembly.
The driver/power amplifier RF output jack
is at an “N” connector J25, PA RF Output.
The RF output of the driver/amplifier
chassis assembly is connected to the
input of the (A6) circulator and then to
the (A7) pre-filter coupler assembly.
The post-filter coupler supplies a
forward sample, Linear Distortion, which
is cabled to J2 on the (K2) Axciter relay.
The pre-filter coupler supplies a forward,
pre-filter power sample at J3, NonLinear Distortion, which is cabled to J1
on (K2) the Axciter relay mounted on
the left side toward the rear of the
cabinet. The output of the pre-filter
coupler connects to the (A10) low pass
LX Series, Digital, Rev. 0
The RF output of the post-filter coupler
assembly at the J2 “N” connector,
connects to the antenna for your
system.
2-6
Digital VHF HB Driver/Transmitter
w/Axciter Modulator
Chapter 2, System Description &
Remote Control Connections
2.2.1: Pre-Filter Sample (Non-Linear
Distortion) and Post-Filter Sample
(Linear Distortion)
2.4: System Operation
When the transmitter is in operate, as set
by the menu screen located on the
Control & Monitoring Module. 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 is
green. The enable and DC OK indicators
on the PA Module will also be turned to
green.
A forward power sample, pre-filtering,
(Non-Linear Distortion), of the output of
the power amplifier assembly, from (A7)
the pre-filter coupler connects to J1, on
the K2 relay. (-10 to 0 dBm, Typical
level –5 dBm but must be within .5 dB of
the J2 sample level.)
A forward power sample, post-filtering
(Linear Distortion), of the output of the
transmitter is provided from (A11) the
post-filter coupler. The post-filter sample
connects to J2, on the K2 relay. (-10 to
0 dBm, Typical level –5 dBm but must be
within .5 dB of the J1 sample level.)
When the transmitter is in standby, 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 and indicator on the
PA Module is also extinguished.
The switching of the relay between the
two samples is controlled by the Axciter
Modulator tray through J7. The selected
output of the relay at J3, either the Pre
or Post filter sample, connects to the rear
of the driver/ amplifier chassis assembly
at the SMA Jack J41. This sample is
connected to the downconverter module,
which is part of the Axciter system for
use in the adaptive equalization process.
If the transmitter does not switch to
Operate when the operate menu is
switched to Operate, check that all faults
are cleared and that the remote control
terminal block stand-by signal is not
active.
2.4.1: Principles of Operation
Operating Modes
2.3: Control and Status
This transmitter is either operating or in
standby mode. The sections below
discuss the characteristics of each of
these modes.
The control and status of the driver/
amplifier chassis assembly is found by
operating the front panel display screen on
the assembly. Detailed information on the
use of the screen is found in Chapter 3 of
this manual.
Operate Mode
Operate mode is the normal mode for
the transmitter when it is providing RF
power output.
2.3.1: Front Panel Display Screen
A 4 x 20 display located on the front of
the Control & Monitoring/Power Supply
Module is used in the LX Series
transmitter for control of the operation
and display of the operating parameters
of the transmitter.
LX Series, Digital, Rev. 0
Entering Operate Mode
Entering the operate mode can be
initiated a few different ways by the
transmitter control board. A list of the
actions that cause the operate mode to
be entered is given below:
2-7
Digital VHF HB Driver/Transmitter
w/Axciter Modulator
•
•
•
Chapter 2, System Description &
Remote Control Connections
A low on the Remote Transmitter
Operate line.
User selects "OPR" using switches
and menus of the front panel.
Receipt of an “Operate CMD” over
the serial interface.
feature is implemented in transmitter
software version 1.4 and above.
Operating Frequency
The transmitter controller is designed to
operate on VHF frequencies. The exact
output frequency of the transmitter can
be set to one of the standard VHF
frequencies, or to a custom frequency
using the software channel set-up menu
on the Controller Module. Since RF
performance of the transmitter requires
different hardware for different
frequency bands, not all frequency
configurations are valid for a specific
transmitter. The Power detectors in the
transmitter are frequency dependent,
therefore detectors of power amplifiers
are calibrated at their frequency of use.
The detectors for System RF monitoring
are also calibrated at the desired
frequency of use.
There are several fault or interlock
conditions that may exist in the
transmitter that will prevent the
transmitter from entering the operate
mode. These conditions are:
•
•
Power Amplifier heat sink
temperature greater than 78°C.
Power Amplifier Interlock is high
indicating that the amplifier is not
installed.
Standby Mode
The standby mode in the transmitter
indicates that the transmitters output
amplifier is disabled.
Entering Standby Mode
2.5: Maintenance
Similar to the operate mode, the
standby mode is entered various
different ways. These are:
The Innovator LX Series Driver/
Transmitter 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 and the periodic check of
general tightness of hardware.
•
•
•
A low on the Remote Transmitter
Stand-By line.
Depressing the “STB” key on
selected front panel menus.
Receipt of a “Standby CMD” over the
serial interface.
It is recommended that periodically, the
time interval depends on the amount of
movement the cabinet receives, all
mounting hardware holding tray slides,
shelving and mounting plates inside the
cabinet are checked for tightness. All
screws and bolts that are accessible
should be tightened initially when the
transmitter is received and periodically
thereafter if the transmitter is moved by
vehicle. All coaxial connectors, hard-line
connections and hardware holding
combiners, splitters, or any other
mounted items should be checked and
tightened. Check the front panel
thumbscrews that hold the Exciter/Driver
Sleds, Amplifier Module and Power
Supply Sleds in place are tight. This is
RF System Interlock
A RF System Interlock signal is provided
through TB30-5. When this signal's
circuit is completed to ground such as
through a wire between TB30-5 and
TB30-15, the transmitter is allowed to
operate. If this circuit is opened, the
transmitter switches to a Mute condition.
This circuit may be completed through
coax relay contacts and reject load
contact closures to assure the RF output
system is available to receive the
transmitter's output RF signal. This
LX Series, Digital, Rev. 0
2-8
Digital VHF HB Driver/Transmitter
w/Axciter Modulator
Chapter 2, System Description &
Remote Control Connections
especially important after the transmitter
has been transported
permit the free flow of air for cooling
purposes.
The amount of time between cleanings
depends on the conditions within the
transmitter 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.
It is recommended that the operating
parameters of the amplifier assembly and
transmitter 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.
2.6: Customer Remote Connections
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 silkscreened 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
The remote monitoring and operation of
the transmitter is provided through jack
TB30 located on the rear of the chassis
assembly. If remote connections are
made to the transmitter, they must be
made through the plug TB30 at the
positions noted on the transmitter
interconnect drawing and Table 2-11.
TB30 is an 18 position terminal block that
is removable from its sockets to make
connections easier. Just grasp and pull
the connector straight out. After
connections are made, replace the
connector and push firmly to seat the
connector in the socket.
TB30
TB31
Figure 2-2: Rear View LX Series Chassis Assembly
LX Series, Digital, Rev. 0
2-9
Digital VHF HB Driver/Transmitter
w/Axciter Modulator
Chapter 2, System Description &
Remote Control Connections
Table 2-11: LX Series Chassis Assembly Hard Wired Remote Interface Connections to
TB30 or TB31, 18 pos. Terminal Blocks Located on the Rear of the Assembly
Pin
Signal Name
Signal Type/Description
Designations
RMT
Discrete Open Collector Output - A low indicates that
Transmitter
TB30-1
the transmitter is in the operate mode.
State
Discrete Open Collector Output - A low indicated the
RMT
transmitter is OK or completes a interlock daisy chain.
Transmitter
TB30-2
When the transmitter is not faulted, the interlock circuit
Interlock
is completed.
Ground - Configurable ground return which can be
RMT
either jumpered directly to ground or it can be the
Transmitter
TB30-3
“source” pin of a FET so that the transmitter interlock
Interlock
can be daisy chained with other transmitters. This
Isolated Return
signal does not directly interface to the microcontroller.
Discrete Open Collector Inputs, Discrete Open Drain
Outputs, or 0 - 5 VDC Analog Input - When used as an
output, this line is pulled to +5 VDC with a 1.0 kO
resistor for logic high and pulled to ground for a low. A
RMT AUX IO 1
TB30-4
diode allows this line to be pulled up to 12 VDC. When
used as a digital input, this line considers all values over
2 Volts as high and those under 1 volt as low. As an
analog input, this line is protected by a 5.1 Zener diode.
When this signal's circuit is completed to ground such as
through a wire between TB30-5 and TB30-15, the
RMT RF System
transmitter is allowed to operate. If this circuit is
TB30-5
Interlock
opened, the transmitter switches to a Mute condition.
Implemented in transmitter software version 1.4 and
above.
RMT
Transmitter
Discrete Open Collector Input - A pull down to ground
TB30-6
on this line indicates that the transmitter is to be placed
Operate
Command
into the operate mode.
RMT
Discrete Open Collector Input - A pull down to ground
Transmitter
TB30-7
Stand-By
on this line indicates that the transmitter is to be placed
Command
into the standby mode.
RMT Power
Discrete Open Collector Input - A pull down to ground
Raise
TB30-8
on this line indicates that the transmitter power is to be
Command
raised.
RMT Power
Discrete Open Collector Input - A pull down to ground
Lower
TB30-9
on this line indicates that the transmitter power is to be
Command
lowered.
Analog Output - 0 to 4.0 V- This is a buffered loop
RMT
through of the calibrated “System Reflected Power ” and
System Reflect
TB30-10
indicates the transmitter's reflected output power. The
Power
scale factor is 25 % / 3.2V.
Analog Output - 0 to 4.0 V- This is a buffered loop
RMT System
through of the calibrated “System Average Power ”.
TB30-11
Forward Power
Indicates the transmitter's Average power. Scale factor
is 100 % / 3.2V.
LX Series, Digital, Rev. 0
2-10
Digital VHF HB Driver/Transmitter
w/Axciter Modulator
RMT Spare 1
RMT Spare 2
Pin
Designations
TB30-13
TB30-14
RMT +12 VDC
TB30-16
RMT -12 VDC
TB30-18
RMT Ground
TB30-15, and
17
Signal Name
LX Series, Digital, Rev. 0
Chapter 2, System Description &
Remote Control Connections
Signal Type/Description
Remote connection to spare module - Use is TBD.
Remote connection to spare module - Use is TBD.
+12 VDC available through Remote w/ 2 Amp
re-settable fuse
-12 VDC available through Remote w/ 2 Amp
re-settable fuse
Ground pins available through Remote
2-11
Digital VHF HB Driver/Transmitter
w/Axciter Modulator
Chapter 3, Site Considerations,
Installation and Setup Procedures
Chapter 3
Site Considerations, Installation and Setup Procedures
Table 3-1: LX Series Digital Transmitters/Drivers AC Input and Current Requirements.
Transmitter/
Voltage
Current
Driver
5 Watt
117/220 VAC
5 Amps
50/60 Watt
117/220 VAC
10 Amps
125 Watt
220 VAC
10 Amps to the Exciter/Amplifier Cabinet
250 Watt
220 VAC
15 Amps to the Exciter/Amplifier Cabinet
500 Watt
220 VAC
25 Amps to the Exciter/Amplifier Cabinet
1000 Watt
220 VAC
45 Amps to the Exciter/Amplifier Cabinet
1500 Watt
220 VAC
65 Amps to the Exciter/Amplifier Cabinet
220 VAC
45 Amps to the Exciter/Amplifier Cabinet
2000 Watt
220 VAC
40 Amps to the Amplifier Cabinet
220 VAC
45 Amps to the Exciter/Amplifier Cabinet
2500 Watt
220 VAC
60 Amps to the Amplifier Cabinet
220 VAC
65 Amp to the Exciter/Amplifier Cabinet
3000 Watt
220 VAC
60 Amps to the Amplifier Cabinet
3.1: Site Considerations
environment in which they are placed is
important and certain precautions must
be taken. The three greatest dangers to
the transmitter are heat, dirt, and
moisture. Heat is usually the greatest
problem, followed by dirt, and then
moisture. Over-temperature can cause
heat-related problems such as thermal
runaway and component failure. Each
amplifier module in the transmitter
contains a thermal interlock protection
circuit that will shut down that module
until the temperature drops to an
acceptable level.
There are special considerations that
need to be taken into account before the
LX Series digital driver/transmitter can
be installed. For example, if the
installation is completed during cool
weather, a heat-related problem may not
surface for many months, suddenly
appearing during the heat of summer.
This section provides planning
information for the installation and set up
of the transmitter.
The AC input and current requirements
for LX Series digital transmitter/drivers
are shown in Table 3-1.
A suitable environment for the
transmitter can enhance the overall
performance and reliability of the
transmitter and maximize revenues by
minimizing downtime. A properly
designed facility will have an adequate
supply of cool, clean air, free of airborne
particulates of any kind, and no
excessive humidity. An ideal environment
will require temperature in the range of
40° F to 70° F throughout the year,
reasonably low humidity, and a dust-free
room. It should be noted that this is
rarely if ever attainable in the real world.
However, the closer the environment is
NOTES: The transmitter is factory set
for either 110 VAC or 220 VAC
operation as directed by customer.
Transmitters above 125 Watts use
220 VAC Input only.
Transmitters 2000 Watts and above
require two 220 VAC Inputs, one to
each cabinet.
The LX Series Digital Transmitters are
designed and built to provide long life
with a minimum of maintenance. The
LX Series, Digital, Rev. 0
3-1
Digital VHF HB Driver/Transmitter
w/Axciter Modulator
Chapter 3, Site Considerations,
Installation and Setup Procedures
to this design, the greater the operating
capacity of the transmitter.
method and is the only way to create
anything close to an ideal environment.
The fans are designed and built into the
transmitter will remove the heat from
within the modules, but additional means
are required for removing this heat from
the building. To achieve this, a few issues
need to be resolved. The first step is to
determine the amount of heat to be
removed from the transmitter room.
There are generally three sources of heat
that must be considered. The first and
most obvious is the heat from the
transmitter itself. This amount can be
determined for a 50W digital transmitter
by subtracting the average power to the
antenna (50 watts) from the AC input
power (650 watts) and taking this
number in watts (600) and then
multiplying it by 3.41. This gives a result
of 2,046, the BTUs to be removed every
hour. 12,000 BTUs per hour equals one
ton. Therefore, a 1/4-ton air conditioner
will easily cool a 50W digital transmitter.
Ventilation will work quite well if the
ambient air temperature is below 100° F,
or about 38° C, and the humidity is kept
at a reasonable level. In addition, the air
stream must be adequately filtered to
ensure that no airborne particulates of
any kind will be carried into the
transmitter. The combination of air
conditioning for summer and ventilation
during the cooler months is acceptable
when the proper cooling cannot be
obtained through the use of ventilation
alone and using air conditioning
throughout the year is not feasible.
Caution: The use of air conditioning
and ventilation simultaneously is not
recommended. This can cause
condensation in the transmitters.
The following precautions should be
observed regarding air conditioning
systems:
The second source of heat is other
equipment in the same room. This
number is calculated in the same way as
the equation for BTUs. The third source
of heat is equally obvious but not as
simple to calculate. This is the heat
coming through the walls, roof, and
windows on a hot summer day. Unless
the underside is exposed, the floor is
usually not a problem. Determining this
number is usually best left up to a
qualified HVAC technician. There are far
too many variables to even estimate this
number without reviewing the detailed
drawings of the site that show all of the
construction details. The sum of these
three sources is the bulk of the heat that
must be removed. There may be other
sources of heat, such as personnel, and
all should be taken into account.
Now that the amount of heat that must
be removed is known, the next step is to
determine how to accomplish this. The
options are air conditioning, ventilation,
or a combination of the two. Air
conditioning is always the preferred
LX Series, Digital, Rev. 0
3-2
1.
Air conditioners have an ARI
nominal cooling capacity rating. In
selecting an air conditioner, do not
assume that this number can be
equated to the requirements of
the site. Make certain that the
contractor uses the actual
conditions that are to be
maintained at the site in
determining the size of the air
conditioning unit.
2.
Do not have the air conditioner
blowing directly onto the
transmitter. Under certain
conditions, condensation may
occur on, or worse in, the
transmitter.
3.
Do not separate the front of the
transmitter from the back with the
thought of air conditioning only
the front of the unit. Cooling air is
drawn in at the front of all
transmitters and in the front and
back of others. Any attempt to
Digital VHF HB Driver/Transmitter
w/Axciter Modulator
Chapter 3, Site Considerations,
Installation and Setup Procedures
separate the front of the
transmitter from the rear of the
unit will adversely affect the flow
of cooling air.
4.
5.
velocity of 300 feet per minute
through the filter. This is not a
conservative number but a neverexceed number. In a dusty or
remote location, this number
should be reduced to 150 CFM.
Interlocking the transmitter with
the air conditioner is
recommended to keep the
transmitter from operating without
the necessary cooling.
The periodic cleaning of all filters
is a must.
7.
The inlet and outlet(s) must have
automatic dampers that close any
time the ventilation blower is off.
8.
In those cases in which
transmitters are regularly off for a
portion of each day, a
temperature-differential sensor
that controls a small heater must
be installed. This sensor will
monitor inside and outside
temperatures simultaneously. If
the inside temperature falls to
within 5° F of the outside
temperature, the heater will come
on. This will prevent condensation
when the ventilation blower comes
on and should be used even in the
summer.
9.
A controlled-air bypass system
must be installed to prevent the
temperature in the room from
falling below 40° F during
transmitter operation.
10.
The blower should have two
speeds, which are thermostatically
controlled, and be interlocked with
the transmitter.
11.
The blower on high speed must be
capable of moving the required
volume of air into a half inch of
water pressure at the required
elevation. The free air delivery
method must not be used.
12.
Regular maintenance of the filters,
if used, can not be
overemphasized.
13.
Above 4000 feet, for external
venting, the air vent on the
cabinet top must be increased to
an 8-inch diameter for a 1-kW
When using ventilation alone, the
following general statements apply:
1.
The blower, with attendant filters,
should be on the inlet, thereby
pressurizing the room and
preventing dirt from entering the
transmitter.
2.
The inlet and outlet vents should
be on the same side of the
building, preferably the leeward
side. As a result, the pressure
differential created by wind will be
minimized. Only the outlet vent
may be released through the roof.
3.
4.
5.
6.
The inlet and outlet vents should
be screened with 1/8-inch
hardware cloth (preferred) or
galvanized hardware cloth
(acceptable).
Cooling air should enter the room
as low as practical but in no case
higher than four feet above the
floor. The inlet must be located
where dirt, leaves, snow, etc., will
not be carried in with the cooling
air.
The exhaust should be located as
high as possible. Some ducting is
usually required to insure the
complete flushing of heated air
with no stagnant areas.
The filter area must be large
enough to insure a maximum air
LX Series, Digital, Rev. 0
3-3
Digital VHF HB Driver/Transmitter
w/Axciter Modulator
Chapter 3, Site Considerations,
Installation and Setup Procedures
transmitter and to a 10-inch
diameter for 5-kW and 6-kW
transmitters. An equivalent
rectangular duct may be used but,
in all cases, the outlet must be
increased by 50% through the
outlet screen.
14.
locations, for each 5000 watts or 17,000
BTUs. The exhaust must be at least four
square feet at the exhaust screen for
each 5000 watts or 17,000 BTUs.
The information presented in this section
is intended to serve only as a general
guide and may need to be modified for
unusually severe conditions. A
combination of air conditioning and
ventilation should not be difficult to
design (see Figure 3-1).
It is recommended that a site plan
be submitted to Axcera for
comments before installation
begins.
In calculating the blower requirements,
filter size, and exhaust size, if the total
load is known in watts, 2000 CFM into ½
inch of water will be required for each
5000 watts. If the load is known in BTUs,
2000 CFM into ½ inch of water will be
required for each 17,000 BTUs. The inlet
filter must be a minimum of seven
square feet, larger for dusty and remote
System interlocking and thermostat
settings should be reviewed with Axcera.
As with any equipment installation, it is
always good practice to consult the
manufacturer when questions arise.
Axcera can be contacted at (724) 8738100.
Figure 3-1: 500 Watt Minimum Ventilation Configuration
LX Series, Digital, Rev. 0
3-4
Digital VHF HB Driver/Transmitter
w/Axciter Modulator
Chapter 3, Site Considerations,
Installation and Setup Procedures
3.2: Unpacking the Chassis
w/modules, circulator, low pass
filter, Digital Mask filter and coupler
assemblies
3.3: Installing the Chassis w/modules,
circulator, low pass filter, Digital
Mask filter, and pre and post filter
coupler assemblies
Thoroughly inspect the chassis with
modules and all other materials upon
their arrival. Axcera certifies that upon
leaving our facility the equipment was
undamaged and in proper working order.
The shipping containers should be
inspected for obvious damage that
indicates rough handling.
The chassis assembly is made to mount in
a standard 19” rack. The chassis assembly
mounts using the four #10 clearance
mounting holes on the ends. The chassis
should be positioned to provide the
following: adequate air intake into the front
and the air exhaust of the fan in the rear;
the ability to slide the modules out for
replacement purposes; the installation of
the circulator, low pass and digital mask
filters, the pre and post filter couplers and
the output transmission line. The chassis
or cabinet in which it is mounted should be
grounded using copper strapping material.
Remove the chassis and modules, the
circulator, low pass and digital mask
filters and the directional couplers from
the crates and boxes.
Check for dents and scratches or broken
connectors, switches or display. Any
claims against in-transit damage should
be directed to the carrier. Inform Axcera
as to the extent of any damage as soon
as possible.
NOTE: To remove the driver/power
amplifier module, mounted in the
exciter/driver assembly, the input and
output cables must be removed from the
rear of the module and also a 6/32” x ½”
Philips screw, mounted between the two
connectors, needs to be removed before
the module will pull out. After removal of
the screw, which is used to hold the
module in place during shipping, it does
not need to be replaced.
The modules are mounted to the chassis
assembly with slides that are on the top
and the bottom of the modules. There
are two thumb screws on the front panel
that hold each of the modules in place.
The chassis assembly is mounted in the
cabinet using Chassis Trak cabinet slides.
The tray slides are on the side of the
assembly. Inspect the assembly for any
loose hardware or connectors, tightening
where needed.
Check that the (A6) circulator, the (A7)
pre-filter coupler, the low pass and digital
mask filters, and the (A9) post-filter
coupler assembly are connected to the
output of the power amplifier assembly.
Connect the transmission line for the
antenna system to the “N” jack at the
output of the (A11) post-filter coupler.
Check that J3 the SMA forward sample jack
of the (A7) pre-filter coupler is connected
to J1 on the K2 Axciter Relay. Check that
the forward SMA jack of the (A11) postfilter coupler is connected to J2 on the K2
Axciter Relay.
LX Series, Digital, Rev. 0
3-5
Digital VHF HB Driver/Transmitter
w/Axciter Modulator
Chapter 3, Site Considerations,
Installation and Setup Procedures
Figure 3-2: Tray Slides Cabinet Mounting Diagram
Figure 3-3: Front and Rear View Reconnection Drawing
3.4: AC Input
Once the chassis and output
connections are in place, connect the
AC power cord from the chassis
assembly of the 5W or 60W digital
transmitter/driver to an AC outlet
The AC input and current requirements
for LX Series digital transmitter/drivers
are indicated in the Table 3-1 located
at the beginning of this chapter.
NOTES: 1) The transmitter is
factory set for either 110 VAC or
220 VAC operation as directed by
customer.
3) Transmitters 2000 Watts and
above require two 220 VAC Inputs,
one to each cabinet.
The AC Input to the high power
transmitter connects to the terminal
block mounted in the AC input box
located toward the rear, right side near
the top of the cabinet. Connect the AC
Input Line 1 to Line 1 on the terminal
block, the AC Input Line 2 to Line 2 on
the terminal block and the AC Input
Ground to Ground on the terminal
block. See Figure 3-4.
2) Transmitters above 125 Watts
use 220 VAC Input only.
LX Series, Digital, Rev. 0
3-6
Digital VHF HB Driver/Transmitter
w/Axciter Modulator
Chapter 3, Site Considerations,
Installation and Setup Procedures
load is not available, check that the
output of the coupler assembly is
connected to the antenna for your
system.
3.5.1: Input Connections
Figure 3-4: AC Input Box Assembly
NOTE: An AC On/Off Circuit Breaker is
located on the rear of the Exciter/Driver
Chassis Assembly, near the AC input
jack. In high power transmitters, there
is one On/Off Circuit Breaker, located
on the rear of the Power Amplifier
Assembly, for each power supply
assembly.
This completes the unpacking and
installation of the LX Series VHF
television transmitter. Refer to the
setup and operation procedures that
follow before applying power to the
transmitter.
3.5: Set Up and Operation
Initially, the transmitter should be
turned on with the RF output at the
coupler assembly terminated into a
dummy load of a value dependent on
the power rating of the transmitter. If a
The input connections to the
transmitter are made to jacks mounted
on the rear of the driver/amplifier
chassis assembly.
The Axciter System accepts an SMPTE
MPEG-2 transport stream input that
connects to J27 on the rear of the
Axciter Modulator. The external 10
MHz reference, if used, connects to J9
on the Axciter modulator tray. The IF
output of the Axciter modulator tray at
J40 is cabled to J15, the Digital IF
input jack, located on the rear of the
Driver/Amplifier Chassis Assembly.
Check that J2 on the Axciter connects
to J13 on the Driver/Amplifier Chassis.
Check that J15 on the Axciter connects
to J40 on the Driver/Amplifier Chassis.
Check that J12 on the Axciter connects
to J10 on the Driver/Amplifier Chassis.
Refer to the table 3-2 that follows for
detailed information.
Figure 3-5: Rear View of Exciter Driver Chassis Assembly
J25
J40
J41
TB30
TB02
TB31
J9
J15
J24
J18
J6
J23
J1
J32
J34
J33
LX Series, Digital, Rev. 0
3-7
J13
J4
J8
J19
J10
J3
J7
J17
J12
J5
Digital VHF HB Driver/Transmitter
w/Axciter Modulator
Table 3-2: Rear Chassis
Port
Type
J1
IEC
TB02 Term
J3
BNC
J4
BNC
J5
BNC
J6
BNC
J7
BNC
J8
BNC
J9
BNC
J10
BNC
J12
BNC
J13
BNC
J15
BNC
J17
BNC
J18
BNC
J19
BNC
J23
BNC
J24
BNC
J25
Chapter 3, Site Considerations,
Installation and Setup Procedures
Connections for the LX Series Digital Driver/Amplifier.
Function
AC Input
(NOT USED) Base Band Audio Input
(NOT USED) Composite Audio Input
(NOT USED) SAP / PRO Audio Input
(NOT USED) CW IF Input
(NOT USED) Digital IF Input
(NOT USED) Video Input (Isolated)
(NOT USED) Visual IF Loop-Thru Output
(NOT USED) Aural IF Loop-Thru Output
Ext. 10 MHz Reference Input (From Axciter J12)
(NOT USED) MPEG Input
Downconverter IF Output (To Axciter J2)
Digital IF I/P (From Axciter J40)
(NOT USED) Video Loop-Thru (Isolated)
(NOT USED) Visual IF Loop-Thru Input
(NOT USED) Aural IF Loop-Thru Input
Upconverter RF Output (Jumpered to J24)
PA RF Input (Jumpered from J23)
PA RF Output
Impedance
N/A
600O
75O
50O
50O
50O
75O
50O
50O
50O
50O
50O
50O
75O
50O
50O
50O
50O
50O
J32
J33
J34
RJ-45
RJ-45
RJ-45
SCADA (Input / Loop-Thru)
SCADA (Input / Loop-Thru)
System RS-485 Serial (From/To Axciter J4)
CAT5
CAT5
CAT5
J40
J41
SMA
SMA
1GHz Input (From Axciter J15)
Downconverter RF Input (From K2 Relay J3)
50O
50O
Termination
Termination
Remote Control & Monitoring
Remote Control & Monitoring
N/A
N/A
TB30
TB31
3.5.2: Initial Turn On
the rear of each Power Amplifier
Assembly is On.
Once the unit has been installed and all
connections have been made, the
process of turning on the equipment can
begin. First, verify that AC power is
present and connected to the
transmitter. Verify all cables are properly
connected and are the correct type.
Once things are completed, the unit is
ready to be turned on following the
procedures below.
3.5.2.1: Axciter Upconverter Sled
Module LEDs on Front Panel
Status Indicators:
PLL: This illuminates Green when the
phase lock loop circuit is closed, Red if
unlocked.
STATUS: This illuminates Green if no
faults, Red when a fault has occurred in
the upconverter.
Turn on the main AC power source that
supplies the AC to the transmitter. Check
that the AC power plug is connected to
the AC Input jack on the back of the
assembly and that the On/Off circuit
breaker located on the rear chassis is
On. In high power transmitters, check
that the On/Off circuit breaker located on
LX Series, Digital, Rev. 0
AGC: This illuminates Green when in
Auto, Amber when in Manual.
3-8
Digital VHF HB Driver/Transmitter
w/Axciter Modulator
Chapter 3, Site Considerations,
Installation and Setup Procedures
3.5.2.2: Controller Module LEDs on
Front Panel
2 Blinks indicate Temperature Fault.
3 Blinks indicate +32V Power Supply
Over Voltage Fault.
4 Blinks indicate +32V Power Supply
Under Voltage Fault.
5 Blinks indicate Reflected Power Fault.
6 Blinks indicate +12V or –12V Power
Supply Fault
Status Indicators:
OPERATE - This illuminates Green when
transmitter is in operate.
FAULT - This illuminates Red when a
fault has occurred in the transmitter.
If the Module OK LED is Amber and
blinking, it indicates the power output of
the amplifier has dropped below 65%.
(NOTE: Only in Amplifier Code Versions
3.7A or later and System Controller Code
Versions 3.9C or later.).
DC OK - This illuminates Green when the
DC outputs that connect to the modules
in the transmitter are present.
3.5.2.3: Driver Power Amplifier
Module LEDs on Front Panel
3.5.3: Front Panel Screens for the
Driver/Amplifier Chassis Assembly
NOTE: Both the IPA Module and PA
Module have the same front panel LEDs.
A 4 x 20 display located on the front of
the Control & Monitoring/Power Supply
Module is used in the LX Series exciter
for control of the operation and display
of the operating parameters of the
transmitter. Below are the display
screens for the system. The ↑ and ↓
characters are special characters used to
navigate up or down through the menu
screens. Display text flashes on discrete
fault conditions for all screens that
display a fault condition. When the
transmitter is in operate mode, the STB
menu appears. When the transmitter is
in standby mode, the OPR menu
appears.
Status Indicators:
ENABLED - This illuminates Green when
the PA is in operate.
DC OK - This illuminates Green when the
DC inputs to the PA module are present.
TEMP - This illuminates Green when the
temperature of the heatsink in the PA is
below 78°C.
MOD OK - This illuminates Green when
the PA module is operating and has no
faults.
NOTE: The following screens are typical
and may be different from the screens in
your system.
If the Module OK LED is Red and blinking,
a fault is present. The meaning of the
blinking LED is as follows.
1 Blink indicates Amplifier Current Fault.
Display Menu Screens for the LX Series Driver/Amplifier
Table 3-3: Menu 01 - Splash Screen #1
This is the first of the two transmitter splash screens that is shown for the first few
seconds after reset or after pushing the SPL button on the Main Screen. This screen will
automatically switch to the second splash screen.
LX Series, Digital, Rev. 0
3-9
Digital VHF HB Driver/Transmitter
w/Axciter Modulator
Chapter 3, Site Considerations,
Installation and Setup Procedures
Table 3-4: Menu 02- Splash Screen #2
This is the second of the two transmitter splash screens. This screen will automatically
switch to the Main Screen. The Model Number, Code Version Number and Firmware
Number for your system are displayed on this screen. Make note of these two numbers
when conferring with Axcera on software problems.
Table 3-5: Menu 10 - Main Screen:
This is the default main screen of the transmitter. When the transmitter is in
Standby, the 'OPR' characters appear in the lower right. By pushing the right most
button located under the display, the operator will place the Transmitter in Operate.
When the transmitter is in Operate the 'SBY' characters are displayed, the “OFF” is
replaced with 'ON' and the forward power values are displayed. Pushing the SPL button
will display the two splash screens.
If the ↓ key is activated the display changes to Menu 11, the System Error List Access
Screen. If the ↑ key is activated the display changes to Menu 13, the Transmitter
Configurations Access Screen.
Table 3-6: Menu 11 - Error List Access Screen
This screen of the transmitter shows the current number of errors, displayed in upper,
right of screen (0), and provides operator access to view Menu 20, the error list screens,
by pushing the ENT button. When ENT is pushed, Menu 20, the Error List Display Screen
is displayed. If the ↓ key is pushed the display changes to Menu 12, Table 3-7, the
Transmitter Device Data Access Screen. If the ↑ key is activated the display returns to
Menu 10, the Main Screen.
Table 3-7: Menu 12 - Transmitter Device Data Access Screen
This screen of the transmitter allows access to various parameters of the transmitter
system. This is the entry point to Menu 30, the System Details Screens, by pausing the
ENT button. When the ENT button is pushed, Menu 30 is accessed. Go to Menu 30, Table
3-12 for set up details. Before pushing the ENT button: if the ↓ key is activated the
display changes to Menu 13, Transmitter Configurations Access Screen. If the ↑ key is
activated the display returns to Menu 11, the Error List Access Screen.
LX Series, Digital, Rev. 0
3-10
Digital VHF HB Driver/Transmitter
w/Axciter Modulator
Chapter 3, Site Considerations,
Installation and Setup Procedures
Table 3-8: Menu 13 - Transmitter Configuration Access Screen
This screen of the transmitter allows access to various software settings of the
transmitter system. If ENT is pushed, go to Menu 40, Table 3-13, the access to
transmitter configuration and set up. Before pushing the ENT button: if the ↓ key is
activated the display returns to Menu 10, Main Screen. If the ↑ key is activated the
display returns to Menu 12, the Transmitter Device Data Access Screen.
Table 3-9: Menu 20 - Error List Display Screen
This screen of the transmitter allows access to the system faults screens. Fault logging is
stored in non-volatile memory. The transmitter's operating state can not be changed in
this screen. The 'CLR' switch is used to clear previously detected faults that are no
longer active. The ↑ key and ↓ key allow an operator to scroll through the list of errors
that have occurred. The ESC button is used to leave this screen and return to Menu 11,
Table 3-6, the Error List Access Screen. NOTE: Shown is example of a typical screen.
Menu 30 is entered by selecting ENT at Menu 12, Table 3-7.
Table 3-10: Menu 30 - Transmitter Device Details Screen
This screen allows access to the transmitter parameters of installed devices. The system
is configured to know which devices are present. Current values for all installed devices
are shown. If a module is not installed, only a "MODULE NOT PRESENT" message will be
displayed. The first screen displayed is Menu 30-1, Table 3-11, the System Details
Screen.
Table 3-11: Menu 30-1 – System Details Screen
This is first screen of the details screens. The ↓ and ↑ arrows allow you to scroll through
the different parameters of each device as shown in Table 3-12. Each System
Component is a different screen. The proper modules will be programmed for your
system.
LX Series, Digital, Rev. 0
3-11
Digital VHF HB Driver/Transmitter
w/Axciter Modulator
Chapter 3, Site Considerations,
Installation and Setup Procedures
Table 3-12: Transmitter Device Parameters Detail Screens
System
Component
Parameter
Normal
Faulted
(Blinking)
D/C PIN ATTEN VOLTAGE
OVERDRIVE FAULT
AGC MODE
ADAPTIVE EQUALIZATION
STATUS
MEASURED SIGNAL TO NOISE
PLL STATUS
SMTE310 INPUT STATUS
DEMOD FUNCTION STATUS
FX VERSION
NB VERSION
D/C PIN ATTEN VOLTAGE
U/C PIN ATTEN VOLTAGE
AFC 1 LEVEL
INPUT STATUS
OUTPUT STATUS
AGC 1 LEVEL
AGC 2 LEVEL
PLL
PLL STATUS
OVERDRIVE LEVEL STATUS
CODE VERSION
˜ .6V
˜ 1.6V
AUTOMATIC
N/A
N/A
N/A
RUNNING
˜ 32.6dB
LOCKED
OK
OK
˜ 1.013
˜ 0.029
˜ 0.0
˜ 1.6V
˜ 0.06V
OK
ON
˜ 0.32V
˜ 0.00V
XXXMHz
OK
OK
1.6h or higher
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
FAULT
FAULT
N/A
System Control
Details
SUPPLY ENABLED FOR
xxx HOURS
N/A
Driver or PA
Details
POWER SUPPLY STATE, 32V
±12V SUPPLY
FORWARD POWER
REFL POWER
AMP 1 CURRENT
AMP 2 CURRENT
TEMPERATURE
CODE VERSION
PA HAS OPERATED FOR
˜ 32 VDC
OK
xxx%
xxx%
xx.xA
xx.xA
xxC
3.6x
x.x HRS
N/A
FAULT
N/A
N/A
N/A
N/A
N/A
N/A
N/A
Axciter Details
Upconverter
Details
Pushing the ↓ Down Arrow, after scrolling through all of the detail screens, will put you
back to Menu 30, Table 3-10. Push the ESC button to exit the Transmitter Device
Parameter Screens to Menu 12, Table 3-7, the Transmitter Device Parameter Access
Screen.
Menu 40 (Table 3-13) is entered by selecting ENT at Menu 13.
Table 3-13: Menu 40 - Authorized Personnel Screen
This screen of the transmitter notifies an operator that they are only to proceed if they
are authorized to make changes to the transmitter's operation. Changes made within the
following set-up screens can affect the transmitters output power level, output frequency,
LX Series, Digital, Rev. 0
3-12
Digital VHF HB Driver/Transmitter
w/Axciter Modulator
Chapter 3, Site Considerations,
Installation and Setup Procedures
and the general behavior of the transmitter. Please do not make changes within the
transmitter's set-up screens unless you are familiar with the operation of the transmitter.
This screen is implemented in transmitter software version 1.4 and above.
Pressing ENT will put you into the Transmitter Set Up Screens for Menu 40.
A safeguard is added to the Set Up Menus in software version 2.5 and above. If a change
is made to a screen within the Set Up Menus, when you go to the next menu, a new
screen asks if you accept the change or want to return to the previous menu to
reconsider the changes made.
To accept the changes, the two buttons located under ACCEPT must be pushed
simultaneously.
To return to the previous Menu to make corrections, the two buttons located under the
RETURN must be pushed simultaneously.
Upon returning to the previous Menu the correct input must be entered and the above
procedure repeated, this time accepting the changes
Accept or Return to previous Menu Screen
Pushing these two buttons
Simultaneously will accept
the change.
Pushing these two buttons
Simultaneously will return you
to the previous Menu.
Typical Set Up Screens are shown in Table 3-14 Menu 40-1 through Table 3-22 Menu 4019 that follow.
Table 3-14: Menu 40-1 - Transmitter Set-up: Power Control Screen
This screen of the transmitter is the first of several that allows access to transmitter setup parameters. When + is selected, the Power will increase. When - is selected, the
Power will decrease.
Table 3-15: Menu 40-3 - Transmitter Set-up: Model Select Screen
This screen is used to specify which components are expected to be part of the system.
By specifying the model number, the transmitter control firmware knows which
components should be installed and it will be able to display faults for components that
are not properly responding to system commands.
LX Series, Digital, Rev. 0
3-13
Digital VHF HB Driver/Transmitter
w/Axciter Modulator
Chapter 3, Site Considerations,
Installation and Setup Procedures
Table 3-16: Menu 40-5 - Transmitter Set-up: Serial Address Screen
This screen allows the user to set the serial address of the transmitter. The default
address is 5. This value and all other set-up parameters are stored in non-volatile
memory.
Table 3-17: Menu 40-6 - Transmitter Set-up: System Forward Power Calibration
This screen is used to adjust the calibration of the system's forward power. A symbol
placed under the '6' character is used to show major changes in the calibration value.
When the calibration value is at full value, the character will be full black. As the value
decreases, the character pixels are gradually turned off. The calibration value is a value
between 0 and 255 but the calibration value symbol only has 40 pixels. Therefore small
changes in actual calibration value may not affect the symbol's appearance.
Table 3-18: Menu 40-9 - Transmitter Set-up: System Reflected Power Calibration
This screen is used to adjust the calibration of the system's reflected power. Again a
calibration value symbol is used for this screen as on the previous screens.
Table 3-19: Menu 40-13 - Transmitter Set-up: Minimum Forward Power Fault
Threshold Screen
This screen is used to set the minimum forward power fault threshold. When the
transmitter is operating, it must operate above this value otherwise the system will shut
down with fault for 5 minutes. If after five minutes the fault is not fixed, the transmitter
will enable, measure the power and if less than this value it will again shut down for five
minutes.
Table 3-20: Menu 40-14 - Transmitter Set-up: Maximum Reflected Power Fault
Threshold
This screen is used to set the maximum reflected power fault threshold. When the
transmitter is operating, it must not operate above this value otherwise the system will
slowly begin to reduce the forward output power. If the system's reflected output power
exceeds the maximum reflected power threshold by five percent or more, the transmitter
will shut down with fault for 5 minutes. If after five minutes the fault is not fixed, the
LX Series, Digital, Rev. 0
3-14
Digital VHF HB Driver/Transmitter
w/Axciter Modulator
Chapter 3, Site Considerations,
Installation and Setup Procedures
transmitter will enable, measure power and if above this value plus five percent it will
again shut down for five minutes. If the system's reflected output power exceeds the
maximum reflected power threshold due to some condition like the formation of ice on an
antenna, the transmitter reduces visual forward power to a level where the reflected
power is less than this threshold. The transmitter will automatically increase its output
power to normal operation when the cause of higher than normal reflected power is
corrected.
Table 3-21: Menu 40-19 - Transmitter Set-up: Amplifier Output Power Warning
This screen is used to set up the Amplifier Output Power level at which a warning will be
sent out if the power output of the amplifier drops below this setting. The warning
indication is the blinking of the Module OK LED colored Amber, located on the front of the
amplifier module. (NOTE: Only in Amplifier Code Versions 3.7A or later and System
Controller Code Versions 3.9C or later.)
Table 3-22: Menu 40-19 - Transmitter Set-up: Remote Commands Control
This screen is used to allow or deny the use of remote control commands. When
disabled, remote commands are not used. Remote commands are commands received
either through the rear terminal blocks or through serial messages.
Push the ESC button to exit the Transmitter Set Up Screens to Menu 13, Table 3-8, the
Transmitter Configuration Access Screen.
This completes the description of the menu screens for the LX Series driver/amplifier
chassis assembly.
3.5.4: Operation Procedure
If necessary, connect to the transmitter
to the antenna. Check that the output is
100% and if needed adjust the ALC Gain
adjust pot on the front panel of the IF
Processor to attain 100%. The power
raise / lower settings, in the menus, are
only to be used for temporary reductions
in power.
LX Series, Digital, Rev. 0
The power set-back values do not directly
correspond to the output power of the
transmitter.
This completes the Installation, Set Up
and Turn On of the Driver/Transmitter.
If a problem occurred during the setup
and operation procedures, refer to
Chapter 5, Detailed Alignment
Procedures, of this manual for more
information.
3-15
Digital VHF HB Driver/Transmitter
w/Axciter Modulator
Chapter 4, Circuit Descriptions
Chapter 4
Circuit Descriptions
NOTE: Information and drawings on the
Axciter Modulator Tray and the
Upconverter Module and Downconverter
Module are contained in the separate
Axciter Manual.
back to Jack J1 at Pin 5, which becomes
the AC Line #2 to the Fan. The other line
of the split connects to J2. J1-2 is the
earth ground input for the AC and
connects to J3.
4.1: (A4) Control Monitoring/Power
Supply Module, 220VAC (1303229;
Appendix A)
Three 150-VAC, for 115 VAC input, or
three 275-VAC, for 230 VAC input, MOVs
are connected to the input AC for
protection. One connects from each AC
line to ground and one connects across the
two lines. VR1 connects from J4 to J2, VR2
connects from J4 to J3 and VR3 connects
from J2 to J3.
The Control Monitoring/Power Supply
Module Assembly contains (A1) a Power
Protection Board (1302837), (A2) a 600
Watt Switching Power Supply, (A3) a
Control Board (1302021), (A4) a Switch
Board (1527-1406) and (A5) a LCD
Display.
+12 VDC Circuits
AC Input to the Driver/Amplifier Chassis
Assembly
The AC input to the LX Series
Driver/Amplifier Chassis Assembly is
connected from J1, part of a fused entry
module, located on the rear of the
chassis assembly to J50 on the Control
Monitoring/Power Supply Module. J50-10
is line #1 input, J50-8 is earth ground
and J50-9 is line #2 input. The input AC
connects to J1 on the Power Protection
Board where it is fuse protected and
connected back to J50, at J50-11 AC Line
#1 and J50-12 AC Line #2, for
distribution to the cooling Fan.
4.1.1: (A1) Power Protection Board
(1302837; Appendix A)
The polyswitch resettable fuses may open
on a current as low as 2.43 Amps at
50°C, 3 Amps at 25°C or 3.3 Amps at
0°C. They definitely will open when the
current is 4.86 Amps at 50°C, 6 Amps at
25°C or 6.6 Amps at 0°C.
PS3 protects the +12 VDC 2 Amp circuits
for the System Controller, the Amplifier
Controller and the Spare Slot through J62
pins 7, 8, 9 and 10. If this circuit is
operational, the Green LED DS3, mounted
on the board, will be lit.
PS4 protects the +12 VDC 2 Amp circuits
for the Modulator and the IF Processor
through J62 pins 13, 14, 15 and 16. If
this circuit is operational, the Green LED
DS4, mounted on the board, will be lit
The input AC connects through J1 to two
10 Amp AC fuses F1 and F2. The AC
line #1 input connects from J1-1 to the
F1 fuse. The AC line #1 input after the
F1 fuse is split with one line connected
back to Jack J1 Pin 4, which becomes
the AC Line #1 to the Fan. The other
line of the split connects to J4. The AC
line #2 input connects from J1-3 to the
F2 fuse. The AC line #2 input after the
F2 fuse is split with one line connected
LX Series, Digital, Rev. 0
+12 VDC from the Switching Power
Supply Assembly connects to J6 on the
board. The +12 VDC is divided into four
separate circuits each with a 3 amp self
resetting fuse, PS3, PS4, PS5 and PS6.
PS5 protects the +12 VDC 2 Amp circuits
for the Upconverter through J62 pins 17,
18, 19 and 20. If this circuit is
operational, the Green LED DS5, mounted
on the board, will be lit
4-1
Digital VHF HB Driver/Transmitter
w/Axciter Modulator
PS6 protects the +12 VDC 2 Amp
circuits for the Remote through J63 pins
17, 18, 19 and 20. If this circuit is
operational, the Green LED DS6,
mounted on the board, will be lit
-12 VDC Circuits
-12 VDC from the Switching Power
Supply Assembly connects to J5 on the
board. The -12 VDC is divided into two
separate circuits each with a 3 amp self
resetting fuse, PS1 and PS2.
PS1 protects the -12 VDC 2 Amp circuits
for the System through J63 pins 1, 2, 3
and 4. If this circuit is operational, the
Green LED DS1, mounted on the board,
will be lit
PS2 protects the -12 VDC 2 Amp circuits
for the Remote through J62 pins 1, 2, 3
and 4. If this circuit is operational, the
Green LED DS2, mounted on the board,
will be lit
The connections from J62 and J63 of the
Power Protection Board are wired to J62
and J63 on the Control Board.
4.1.2: (A3) Control Board (1302021;
Appendix A)
In this transmitter, control monitoring
functions and front panel operator
interfaces are found on the Control
Board. Front panel operator interfaces
are brought to the control board using a
26 position conductor ribbon cable that
plugs into J60. The control board
controls and monitors the Power Supply
and Power Amplifier module through a
16 position connector J61 and two 20
position connectors J62 & J63.
4.1.2.1: Schematic Page 1
U1 is an 8-bit RISC microcontroller that
is in circuit programmed or programmed
using the serial programming port J4 on
the board. When the microcontroller,
U1, is held in reset, low on pin 20, by
either the programming port or the
LX Series, Digital, Rev. 0
Chapter 4, Circuit Descriptions
external watchdog IC (U2), a FET Q1
inverts the reset signal to a high that
connects to the control lines of U5, an
analog switch. The closed contacts of U5
connects the serial programming lines
from J4 to U1. LED DS10 will be lit when
programming port J4 is used.
U2 is a watchdog IC used to hold the
microcontroller in reset, if the supply
voltage is less the 4.21 VDC; (1.25 VDC <
Pin 4 (IN) < Pin 2 (Vcc). The watchdog
momentarily resets the microcontroller, if
Pin 6 (ST) is not clocked every second. A
manual reset switch S1 is provided but
should not be needed.
Diodes DS1 through DS8 are used for
display of auto test results. A test board
is used to execute self-test routines.
When the test board is installed,
Auto_Test_1 is held low and Auto_Test_2
is allowed to float at 5 VDC. This is the
signal to start the auto test routines.
U3 and U4 are used to selectively enable
various input and output ICs found on
pages 2 & 3 of the schematic.
U1 has two serial ports available. In this
application, one port is used to
communicate with transmitter system
components where U1 is the master of a
RS-485 serial bus. The other serial port is
used to provide serial data I/O where U1
is not the master of the data port. A dual
RS-232 port driver IC and a RS-485 Port
driver is also in the second serial data I/O
system. The serial ports are wired such
that serial data input can come through
one of the three serial port channels.
Data output is sent out through each of
the three serial port channels.
Switch SW1, transmitter operation select,
is used to select either transmitter
operation or exciter/driver operation.
When the contacts of SW1 are closed,
transmitter operation is selected and the
power monitoring lines of the transmitter’s
power amplifier are routed to the system
power monitoring lines.
4-2
Digital VHF HB Driver/Transmitter
w/Axciter Modulator
Chapter 4, Circuit Descriptions
4.1.2.2: Schematic Page 2
4.1.2.4: Schematic Page 4
U9 is a non-inverting transceiver IC that
provides 2 way asynchronous
communication between data busses.
The IC is used as an input buffer to
allow the microcontroller to monitor
various digital input values.
U19 and U20 are digitally controlled
analog switches that provide samples back
to the microprocessor. Each analog input
is expected to be between 0 and 5 VDC.
If a signal exceeds 5.1 VDC, a 5.1 Volt
zener diode clamps the signals voltage, to
prevent damage to the IC. Most signals
are calibrated at their source, however
two dual serial potentiometers ICs are
used to calibrate four signals, System
Visual/Average Power, System Aural
Power, System Reflected Power and the
Spare AIN 1. For these four circuits, the
input value is divided in half before it is
applied to an op-amp. The serial
potentiometer is used to adjust the output
signal level to between 80 and 120% of
the input signal level. Serial data, serial
clock and serial pot enables are supplied
by the microprocessor to the dual serial
potentiometer ICs. J62 and J63 are two
20 position connectors that provide the
+12 VDC and –12 VDC power through the
Power Protection Board. The ±12 VDC
generated by the switching power supply
connects to J62 and J63 after being fuse
protected on the Power Protection Board.
Digital output latch circuits are used to
control system devices. Remote output
circuits are implemented using open
drain FETs, Q13, Q14, Q16, and Q17,
with greater than 60 Volt drain to source
voltage ratings.
Remote digital inputs are diode
protected, using CR6, CR7, CR8 and CR9
with a 1 kO pull-up resistor, to +5 VDC.
If the remote input voltage is greater
than about 2 Volts or floating, the FET is
turned on and a logic low is applied to
the digital input buffer, U9. If the
remote input voltage is less than the
turn on threshold of the FET (about 2
VDC), a logic high is applied to the
digital input buffer, U9.
Four of the circuits on page two of the
schematic, which include Q2, Q9, Q19
and Q21, are auxiliary I/O connections
wired for future use. They are wired
similar to the remote digital inputs but
include a FET, Q5, Q12, Q20 and Q22,
for digital output operations. To operate
these signals as inputs, the associated
output FET must be turned off. The
FETs are controlled by U10 and U12,
analog input multiplexer ICs.
4.1.2.3: Schematic Page 3
U13, U14, U15, U16, U17 and U18 are 3
state non-inverting transceiver ICs that
provide 2 way asynchronous
communication between data busses.
The ICs are used as input buffers to
allow the microcontroller to monitor
various digital input values. The digital
inputs to the ICs utilize a 10 kO pull-up
resistor. The buffer IC, U18, used for
data transfer to the display is wired for
read and write control.
LX Series, Digital, Rev. 0
4.1.2.5: Schematic Page 5
There are three dual element, red/green,
common cathode LED indicators mounted
on the front panel of the sled assembly:
DC OK, Operate and Fault.
There are three, the fourth is a spare,
identical circuits that drive the front panel
mounted LED indicators. The levels on
the 1, 2, 3 and 4 LED Control Lines, for
both the red and green LEDs, are
generated by the IC U11 as controlled by
the DATABUS from the microprocessor U1.
Each LED controller circuit consists of an
N-Channel MOSFET w/internal diode that
controls the base of an N-P-N transistor in
an emitter follower configuration. The
emitter of the transistor connects the LED.
With the LED control line LOW, the
MOSFET is Off, which causes the base of
4-3
Digital VHF HB Driver/Transmitter
w/Axciter Modulator
the transistor to increase towards +12
VDC, forward biasing the transistor.
With the transistor forward biased,
current will flow from ground through
the LED, the transistor and the current
limiting resistors in the collector to the
+12 VDC source. The effected LED will
light.
With the LED control line HIGH, the
MOSFET is On, which causes the base of
the transistor go toward ground
potential, reverse biasing the transistor.
With the transistor reverse biased, no
current through the transistor and LED,
therefore the effected LED will not light.
A third color, amber, can also be
generated by having both transistors
conducting, both control lines LOW. The
amber color is produced because the
current applied to the green element is
slightly greater than the red element.
This occurs because the current limiting
resistors have a smaller ohm value in
the green circuit.
There are four voltage regulators, three
for +5 VDC and one for +7 VDC, which
are used to power the Control Board.
+12 VDC is applied to U25 the +7 VDC
regulator that produces the +7V, which
is applied to the LEDs mounted on the
board. The +7V is also connected to the
input of U26 a precision +5.0 Volt
regulator. The +5.0Vdc regulator output
is used to power the analog circuits and
as the microcontroller analog reference
voltage. Another two +5 Volt regulator
circuits U27, +5V, and U8, +5 Vserial,
are used for most other board circuits.
4.1.3: (A4) Switch Board (1527-1406;
Appendix A)
The switch board provides five frontpanel momentary contact switches for
user control and interface with the frontpanel LCD menu selections. The
switches, SW1 to SW5, complete the
circuit through connector J1 to
connector J2 that connects to J1 on (A5)
the 20 Character by 4 line LCD Display.
LX Series, Digital, Rev. 0
Chapter 4, Circuit Descriptions
J1 on the switch board is also cabled to
the Control Board. When a switch is
closed, it connects a logic low to the
control board that supplies the information
from the selected source to the display.
By pushing the button again, a different
source is selected. This occurs for each
push button. Refer to Chapter 3 Section
3.5.3, for more information on the Display
Menu Screens.
4.1.4: (A2) Switching Power Supply
Assembly
The power supply module contains a
switching power supply, an eight position
terminal block for distributing the DC
voltages, a three position terminal block
to which the AC Input connects, Jacks J1,
V1 and V2. Jack J1 connects to the
Control Board and supplies DC OK, at J1-4
& 3, and AC OK, at J1-2 & 1, status to the
control board. A Power Supply enable
connects from the control board to the
power supply at V1-6 & 7. The power
supply is configured for three output
voltages +12V, -12V, at the 8 position
terminal block, and a main output power
of +32 VDC at J50 pin A (+) and J50 pin B
(Rtn). The power supply is power factor
corrected to .98 for optimum efficiency
and decrease in energy consumption. For
safety purposes all outputs are over
voltage and over current protected. This
supply accepts input voltages from 85 to
264 volts AC, but the power entry module,
for the exciter/amplifier chassis, must be
switched to the proper input voltage
setting, for the transmitter to operate.
4.2: (A4) Driver Power Amplifier
Assembly, VHF, DTV
(1305822; Appendix A)
NOTE: The 1305822 Driver PA
Assembly is used as a driver for high
power transmitters. Refer to the
1309218 PA Assembly, which follows
in the next section, for the PA used in
the LHV50ATD & LHV60ATD
transmitters.
4-4
Digital VHF HB Driver/Transmitter
w/Axciter Modulator
The Power Amplifier Module Assembly
contains (A5) an Amplifier Control Board
(1308260), (A4) a Coupler Board
(1308258), (A2) a 25 Watt VHF Driver
Module (1305820), and (A3) a 200 Watt
Power Amplifier Assembly (1300167).
The RF input (-2 dBm) to the PA assembly
from the Upconverter Module Assembly
connects from the Upconverter RF Output
BNC Jack J23 to the PA RF Input BNC Jack
J24, located on the rear of the
driver/amplifier chassis assembly.
4.2.1: (A2) 25 Watt VHF Driver
Pallet (1305820; Appendix A)
The RF input at a level of -2 dBm
connects to the RF input jack on the (A2)
25 Watt VHF Amplifier Assembly. The
assembly is manufactured by Delta RF
and has a gain of approximately +30dB.
Refer to the Delta RF data sheet (PA25VHF-H) located in Appendix A for more
information on the assembly. The RF
output (+32 dBm), connects to the RF
input jack on (A3) the 200 Watt power
amplifier assembly.
The +30 VDC bias voltage connects from
the amplifier control board at TB18 to the
feed thru capacitor FL2 on the module
assembly that is wired to the +Vdd input
on the 25 Watt VHF Amplifier Assembly.
4.2.2: (A3) 200 Watt VHF Amplifier
Assembly (1300167; Appendix A)
The RF input at a level of +32 dBm
connects to the RF input jack on the (A3)
200 Watt VHF Amplifier Assembly. The
assembly is manufactured by Delta RF
and has a gain of approximately +16dB.
Refer to the Delta RF data sheet (P200VHF-H) located in Appendix A for more
information on the assembly. The RF
output (+48.2 dBm) connects to the
coupler assembly at J1.
The +30 VDC bias voltage connects from
the amplifier control board at TB19 to the
feed thru capacitor FL1 on the module
LX Series, Digital, Rev. 0
Chapter 4, Circuit Descriptions
assembly that is wired to the +Vdd input on
the 200 Watt VHF Amplifier Assembly.
4.2.3: (A4) Coupler Board Assembly
(1308258; Appendix A)
The coupler board assembly provides
forward and reflected power samples of the
output to (A5) the amplifier control board
where they connect to the metering and
overdrive protection circuits in the system.
The RF input to the coupler assembly, from
the 200 Watt VHF Power Amplifier module,
connects to the SMA jack J1. The RF is
connected by a stripline track to the SMA
type connector RF Output jack J2. A
hybrid-coupler circuit picks off a power
sample that is connected to a SMA type
connector jack J3 as the forward power
sample. Another power sample is taken
from the coupler circuit that is connected
to the SMA type connector jack J4 as the
reflected power sample. The RF output of
the coupler at J2 is cabled to the “N”
connector J25, which is the RF output jack
of the driver/amplifier chassis assembly
(+48dBm).
4.2.4: (A5) VHF Amplifier Control
Board (1308260; Appendix A)
The amplifier control board provides LED
fault and enable indications on the front
panel of the module and also performs the
following functions: overdrive cutback,
when the drive level reaches the amount
needed to attain 110% output power; and
overtemperature, VSWR, and overdrive
faults. The board provides connections to
the LCD Display for monitoring the %
Reflected Power, % Output Power, and the
power supply voltage.
If the Module OK LED, located on the front
panel, is Red and blinking, a fault is
present. The meaning of the blinking LED
is as follows.
1 Blink: Indicates Amplifier Current
Fault.
2 Blinks: Indicate Temperature Fault.
3 Blinks: Indicate +32V Power Supply
4-5
Digital VHF HB Driver/Transmitter
w/Axciter Modulator
Over Voltage Fault.
4 Blinks: Indicate +32V Power Supply
Under Voltage Fault.
5 Blinks: Indicate Reflected Power Fault.
6 Blinks: Indicate +12V or –12V Power
Supply Fault
Chapter 4, Circuit Descriptions
state during a microcontroller reset. A FET
is turned on to shunt current away from
the LED to turn it off. U8 below U6 is used
to enable different features within the
software. Actual use is to be determined.
4.2.4.2: Schematic Page 2
If the Module OK LED, located on the
front panel, is Amber and blinking, it
indicates the power output of the
amplifier has dropped below 65%.
(NOTE: Only in Amplifier Code Versions
3.7A or later and System Controller Code
Versions 3.9C or later.).
4.2.4.1: Schematic Page 1
U4, located upper center of page, is an in
circuit microcontroller. The controller is
operated at the frequency of 3.6864 MHz
using crystal Y1. Programming of this
device is performed through the serial
programming port J2. U4 selects the
desired analog channel of U3 through the
settings of PA0-PA2. PA3 of U4 is a
processor operating LED that can be
flashed to show continued operation.
PF1 is used to monitor the +12VDC
supply to the board. PF4 is the selected
channel of analog switch U3. PF3 and
other selected microcontroller pins are
connected to a via for future use.
U2 is serial to RS-485 driver IC. U5 is a
watchdog IC used to hold the
microprocessor in reset, if the supply
voltage is less than 4.21 VDC. U5
momentarily resets the microcontroller if
Pin 6 (!ST) is not clocked every second.
A manual reset switch, S1, is provided
but should not be needed.
In the Upper left corner, U1 is used to
determine where the amplifier control
board is located. The eight inputs come
from the main amp connector J8 and are
used to set the SCADA address of the
controller. Pull-up resistors set a default
condition of logic high.
In the lower right corner are voltage
regulator circuits. U17 should allow for
0.14 amps of power using its 92 C/W
rating if Ta = 60°C max and Tj = 125°C
max. 0.26amps can be obtained from U17
if the mounting pad is 0.5 square inches.
The controller will not need this much
current. U18 and U19 are low drop out +5
VDC voltage regulators with a tolerance
greater than or equal to 1%. 100mA of
current is available from each device but
the controller will not need this much
current.
In the upper left section are circuits with
U9 and U11. U11 is used to generate a
regulated voltage that is about 5 volts less
than the +32 VDC supply, approximately
+26.25 VDC. When the +32 VDC supply is
enabled, the circuitry around U9A is used
to provide gate voltage to Q14 that is 5
volts greater than the source pin of this
FET. The gate of Q14 can be turned Off by
any one of a few different circuits. U10A is
used to turn Off the gate of Q14 in the
event of high current in amplifier #1. At
1.10 VDC the current to amplifier #1
should be approximately 6.20 Amps. U10B
is used to turn off the Q14 FET, if high
current is detected in amplifier #2. U12A
is used to turn off the Q14 FET, if high
current is detected in amplifier #3. With
2.74 VDC at Pin 5 of U10B or Pin 3 of
U12A, the voltage output of current sense
amplifier U15 or U16 at high current shut
down should be greater than 15 Amps.
U12B is used to detect high power supply
voltage. U13A is used to indicate that the
power supply voltage is less than 26 volts.
U13B determines if the power supply
temperature gets too hot.
U6 below U1 is used to control two of the
four board’s status LEDs and three other
circuits that are not allowed to change
LX Series, Digital, Rev. 0
4-6
Digital VHF HB Driver/Transmitter
w/Axciter Modulator
4.2.4.3: Schematic Page 2, Current
Monitoring Sections of the Board.
The ICs U14, U15 and U16 along with
associated components set up the
current monitoring sections of the board.
R67, R68 and R69 are 0.01O/5W 1%
through hole resistors used for
monitoring the current through several
sections of the amplifier. The voltage
developed across these resistors are
amplified for current monitoring by U14,
U15 or U16. The LT1787HVCS8 precision
high side current sense IC amplifier
accepts a maximum voltage of 60 VDC.
The 43.2 kO resistor from pin 5 to
ground sets the gain of the amplifier to
about 17.28. This value is not set with
much accuracy since the manufacturer
internally matches the resistors of this
part but their actual resistance value is
not closely defined. A trimming resistor
is suggested to give a temperature
stability of –200 ppm/C, but instead the
microcontroller will determine the exact
gain of the circuit and use a correction
factor for measurements. Circuit loading
components are located in the lower
portion of each current monitoring circuit.
A6 is a temperature sensor thermistor
that is used to monitor the temperature
of the external amplifier module's heat
sink. The sensor connects to J6 pins 1 &
2 on the board and is wired to the
comparator IC U13B. If the
temperature increases above 75°C the
output will go Low that is used as a
temperature fault output, which
generates a Fault alert and disables
Amplifier #1.
4.2.4.4: Schematic Page 3, Forward
and Reflected power detector
sections of the board.
A Forward Power Sample enters the
board at the SMA Jack J3 and is split.
One output connects to CR18, which is
the aural portion of the board and is not
used in this configuration. The other part
connects to J4 on the board that is the
SMA Forward Power Sample Jack, located
LX Series, Digital, Rev. 0
Chapter 4, Circuit Descriptions
on the front panel of the assembly. The
other part of the split forward power
sample is detected by CR24 and the DC
level amplified by U21B and U21C. The
output of U21C at pin 8 is connected to
R202, the Visual Power Calibration
Adjustment. R202 sets the level to the IC
U24A, which amplifies the visual power
sample before it is split. A sample of the
visual power, Visual/Avg Power, connects
back to U3 on Page 1. The other visual
power sample connects to amp U24B
whose output is level detected by CR29,
CR28 and CR30 and then to J9-2. The
detected level is used as the power
amplifier AGC voltage for Upconverter AGC
#1.
A Reflected Power Sample enters the board
at the SMA Jack J5 and is detected by
CR31 and the DC level amplified by U21D.
The output of U21D at pin 14 is connected
through the reflected calibration pot R201
to U25A. The output is split with one part
connected to the Reflected Pwr connection
on Page 1 of the schematic that connects
to U3. The other part of the split from
U25A connects to the comparator IC U25B
that has a reference level connected to Pin
5. If the reflected level increases above
the reference level a low Fault output is
produced and connected to the Reflected
Power Shutdown V circuit on Page 2 at
CR14 & CR15. This produces a Reflected
Power Fault V that is connected to an
output of the board, the Fault Alert circuit
and also shuts down the Amplifier.
The Gain of the power measurements is
completed through software. Only the
Aural Null needs to be completed through
front panel pots.
This completes the description of the Power
Amplifier Module Assembly.
The RF output from the exciter driver
power amplifier (˜ +50 dBm Visual, +40
dBm Aural) is at the RF output jack J25, an
“N” connector. The RF is cabled to the
input of the external power amplifier.
4-7
Digital VHF HB Driver/Transmitter
w/Axciter Modulator
4.3: (A4) Power Amplifier Assembly,
DTV/DVB, VHF
(1309218; Appendix A)
NOTE: The 1309218 PA Assembly is
used in the LHV50ATD & LHV60ATD
Transmitters. Refer to the 1305822
Driver PA Assembly, which is in the
previous section, for the driver PA
used in high power transmitters.
The Power Amplifier Module Assembly
contains (A5) an Amplifier Control Board
(1309216), (A4) a Coupler Board
(1308258), (A2) a 25 Watt VHF Driver
Module (1305820), and (A3) a 200 Watt
Power Amplifier Assembly (1300167).
The RF input (-2 dBm) to the PA assembly
from the Upconverter Module Assembly
connects from the Upconverter RF Output
BNC Jack J23 to the PA RF Input BNC Jack
J24, located on the rear of the
driver/amplifier chassis assembly.
4.3.1: (A2) 25 Watt VHF Driver
Pallet (1305820; Appendix A)
The RF input at a level of -2 dBm
connects to the RF input jack on the (A2)
25 Watt VHF Amplifier Assembly. The
assembly is manufactured by Delta RF
and has a gain of approximately +30dB.
Refer to the Delta RF data sheet (PA25VHF-H) located in Appendix A for more
information on the assembly. The RF
output (+32 dBm), connects to the RF
input jack on (A3) the 200 Watt power
amplifier assembly.
The +30 VDC bias voltage connects from
the amplifier control board at TB18 to the
feed thru capacitor FL2 on the module
assembly that is wired to the +Vdd input
on the 25 Watt VHF Amplifier Assembly.
4.3.2: (A3) 200 Watt VHF Amplifier
Assembly (1300167; Appendix A)
The RF input at a level of +32 dBm
connects to the RF input jack on the (A3)
200 Watt VHF Amplifier Assembly. The
assembly is manufactured by Delta RF
LX Series, Digital, Rev. 0
Chapter 4, Circuit Descriptions
and has a gain of approximately +16dB.
Refer to the Delta RF data sheet (P200VHF-H) located in Appendix A for more
information on the assembly. The RF
output (+48.2 dBm) connects to the
coupler assembly at J1.
The +30 VDC bias voltage connects from
the amplifier control board at TB19 to the
feed thru capacitor FL1 on the module
assembly that is wired to the +Vdd input on
the 200 Watt VHF Amplifier Assembly.
4.3.3: (A4) Coupler Board Assembly
(1308258; Appendix A)
The coupler board assembly provides
forward and reflected power samples of the
output to (A5) the amplifier control board
where they connect to the metering and
overdrive protection circuits in the system.
The RF input to the coupler assembly, from
the 200 Watt VHF Power Amplifier module,
connects to the SMA jack J1. The RF is
connected by a stripline track to the SMA
type connector RF Output jack J2. A
hybrid-coupler circuit picks off a power
sample that is connected to a SMA type
connector jack J3 as the forward power
sample. Another power sample is taken
from the coupler circuit that is connected
to the SMA type connector jack J4 as the
reflected power sample. The RF output of
the coupler at J2 is cabled to the “N”
connector J25, which is the RF output jack
of the driver/amplifier chassis assembly
(+48dBm).
4.3.4: (A5) VHF, DVB Amplifier Control
Board (1309216; Appendix A)
The amplifier control board provides LED
fault and enable indications on the front
panel of the module and also performs the
following functions: overdrive cutback,
when the drive level reaches the amount
needed to attain 110% output power; and
overtemperature, VSWR, and overdrive
faults. The board provides connections to
the LCD Display for monitoring the %
Reflected Power, % Output Power, and the
power supply voltage.
4-8
Digital VHF HB Driver/Transmitter
w/Axciter Modulator
If the Module OK LED, DS6, located on
the front panel, is Red and blinking, a
fault is present. The meaning of the
blinking LED is as follows.
1 Blink: Indicates Amplifier Current
Fault.
2 Blinks: Indicate Temperature Fault.
3 Blinks: Indicate +32V Power Supply
Over Voltage Fault.
4 Blinks: Indicate +32V Power Supply
Under Voltage Fault.
5 Blinks: Indicate Reflected Power Fault.
6 Blinks: Indicate +12V or –12V Power
Supply Fault
If the Module OK LED, located on the
front panel, is Amber and blinking, it
indicates the power output of the
amplifier has dropped below 65%.
(NOTE: Only in Amplifier Code Versions
3.7A or later and System Controller Code
Versions 3.9C or later.).
4.3.4.1: Schematic Page 1
U4, located upper center of page, is an in
circuit microcontroller. The controller is
operated at the frequency of 3.6864 MHz
using crystal Y1. Programming of this
device is performed through the serial
programming port J2. U4 selects the
desired analog channel of U3 through the
settings of PA0-PA2. PA3 of U4 is a
processor operating LED that can be
flashed to show continued operation.
PF1 is used to monitor the +12VDC
supply to the board. PF4 is the selected
channel of analog switch U3. PF3 and
other selected microcontroller pins are
connected to a via for future use.
U2 is serial to RS-485 driver IC. U5 is a
watchdog IC used to hold the
microprocessor in reset, if the supply
voltage is less than 4.21 VDC. U5
momentarily resets the microcontroller if
Pin 6 (!ST) is not clocked every second.
A manual reset switch, S1, is provided
but should not be needed.
LX Series, Digital, Rev. 0
Chapter 4, Circuit Descriptions
In the Upper left corner, U1 is used to
determine where the amplifier control
board is located. The eight inputs come
from the main amp connector J8 and are
used to set the SCADA address of the
controller. Pull-up resistors set a default
condition of logic high.
U6 below U1 is used to control two of the
four board’s status LEDs and three other
circuits that are not allowed to change
state during a microcontroller reset. A FET
is turned on to shunt current away from
the LED to turn it off. U8 below U6 is used
to enable different features within the
software. Actual use is to be determined.
4.3.4.2: Schematic Page 2
In the lower right corner are voltage
regulator circuits. U17 should allow for
0.14 amps of power using its 92 C/W
rating if Ta = 60°C max and Tj = 125°C
max. 0.26amps can be obtained from U17
if the mounting pad is 0.5 square inches.
The controller will not need this much
current. U18 and U19 are low drop out +5
VDC voltage regulators with a tolerance
greater than or equal to 1%. 100mA of
current is available from each device but
the controller will not need this much
current.
In the upper left section are circuits with
U9 and U11. U11 is used to generate a
regulated voltage that is about 5 volts less
than the +32 VDC supply, approximately
+26.25 VDC. When the +32 VDC supply is
enabled, the circuitry around U9A is used
to provide gate voltage to Q14 that is 5
volts greater than the source pin of this
FET. The gate of Q14 can be turned Off by
any one of a few different circuits. U10A is
used to turn Off the gate of Q14 in the
event of high current in amplifier #1. At
1.10 VDC the current to amplifier #1
should be approximately 6.20 Amps. U10B
is used to turn off the Q14 FET, if high
current is detected in amplifier #2. U12A
is used to turn off the Q14 FET, if high
current is detected in amplifier #3. With
2.74 VDC at Pin 5 of U10B or Pin 3 of
U12A, the voltage output of current sense
4-9
Digital VHF HB Driver/Transmitter
w/Axciter Modulator
amplifier U15 or U16 at high current shut
down should be greater than 15 Amps.
U12B is used to detect high power supply
voltage. U13A is used to indicate that
the power supply voltage is less than 26
volts. U13B determines if the power
supply temperature gets too hot.
4.2.4.3: Schematic Page 2, Current
Monitoring Sections of the Board.
The ICs U14, U15 and U16 along with
associated components set up the
current monitoring sections of the board.
R67, R68 and R69 are 0.01O/5W 1%
through hole resistors used for
monitoring the current through several
sections of the amplifier. The voltage
developed across these resistors are
amplified for current monitoring by U14,
U15 or U16. The LT1787HVCS8 precision
high side current sense IC amplifier
accepts a maximum voltage of 60 VDC.
The 43.2 kO resistor from pin 5 to
ground sets the gain of the amplifier to
about 17.28. This value is not set with
much accuracy since the manufacturer
internally matches the resistors of this
part but their actual resistance value is
not closely defined. A trimming resistor
is suggested to give a temperature
stability of –200 ppm/C, but instead the
microcontroller will determine the exact
gain of the circuit and use a correction
factor for measurements. Circuit loading
components are located in the lower
portion of each current monitoring circuit.
A6, mounted on the module's heat sink,
is a temperature sensor thermistor that
is used to monitor the temperature of
the external amplifier module's heat
sink. The sensor connects to J6 pins 1 &
2 on the board and is wired to the
comparator IC U13B. If the
temperature increases above 75°C the
output will go Low that is used as a
temperature fault output, which
generates a Fault alert and disables
Amplifier #1.
LX Series, Digital, Rev. 0
Chapter 4, Circuit Descriptions
4.2.4.4: Schematic Page 3, Forward
and Reflected power detector sections
of the board.
A Forward Power Sample enters the board
at the SMA Jack J3 and is split. One output
connects to CR18, which is the aural
portion of the board and is not used in this
configuration. The other part connects to
J4 on the board that is the SMA Forward
Power Sample Jack, located on the front
panel of the assembly. The other part of
the split forward power sample is detected
by CR24 and the DC level amplified by
U21B and U21C. The output of U21C at
pin 8 is connected to R202, the Forward,
Visual Power Calibration Adjustment. R202
sets the level to the IC U24A, which
amplifies the forward, visual power sample
before it is split. A sample of the forward
power, Visual/Average Power, connects
back to U3 on Page 1. The other forward,
visual power sample connects to amp U24B
whose output is level detected by CR29,
CR28 and CR30 and then to J9-2. The
detected level is used as the power
amplifier AGC voltage for Upconverter AGC
#1.
A Reflected Power Sample enters the board
at the SMA Jack J5 and is detected by
CR31 and the DC level amplified by U21D.
The output of U21D at pin 14 is connected
through the reflected calibration pot R201
to U25A. The output is split with one part
connected to the Reflected Pwr connection
on Page 1 of the schematic that connects
to U3. The other part of the split from
U25A connects to the comparator IC U25B
that has a reference level connected to Pin
5. If the reflected level increases above
the reference level a low Fault output is
produced and connected to the Reflected
Power Shutdown V circuit on Page 2 at
CR14 & CR15. This produces a Reflected
Power Fault V that is connected to an
output of the board, the Fault Alert circuit
and also shuts down the Amplifier.
The Gain of the power measurements is
completed through software. Only the
Aural Null needs to be completed through
front panel pots.
4-10
Digital VHF HB Driver/Transmitter
w/Axciter Modulator
This completes the description of the
Power Amplifier Module Assembly.
The RF output from the exciter driver or
power amplifier (˜ +50 dBm Visual, +40
dBm Aural or ˜ +47.7 dBm Digital) is at
the RF output jack J25, an “N” connector.
The RF is cabled to the input of the
external power amplifier or to the
external circulator.
LX Series, Digital, Rev. 0
Chapter 4, Circuit Descriptions
NOTE: Information and drawings on the
Axciter Modulator Tray and the
Upconverter Module and Downconverter
Module are contained in the separate
Axciter Manual
This completes the description of the
Power Amplifier Module Assembly and the
entire LX Driver/Amplifier assembly.
4-11
Digital VHF HB Driver/Transmitter
w/Axciter Modulator
Chapter 5, Detailed Alignment Procedures
Chapter 5
Detailed Alignment Procedures
5.1: System Preparation
need to be replaced, it is only used
during shipping. If the replacement
module does not slide in easily, verify it
is properly aligned in the nylon tracks,
located on both the top and bottom of
the module.
This transmitter was aligned at the
factory and should not require additional
adjustments to achieve normal operation.
The driver/amplifier chassis assembly
and power amplifier assembly are of a
Modular design and when a Module fails
that module needs to be changed out
with a replacement module. The
replacement module can then be sent
back to Axcera for repair. Contact
Axcera Customer Service Department at
724-873-8100 or fax to 724-873-8105,
before sending in any module.
Note: Each Module has an assigned slot
and will not fit properly or operate in the
incorrect slot. Do not try to place a
Module in the wrong slot as this may
damage the slot or the connectors on
the backplane board. Each module has
the name of the module on the front,
bottom for identification and correct
placement. The Modules in the
Driver/Amplifier Chassis Assembly are
placed in the unit from left to right; (1)
Axciter Downconverter, (2) Blank panel,
(3) Blank panel, (4) Axciter
Upconverter, (5) Controller/Power
Supply and (6) Driver Power Amplifier.
5.1.1: Module Replacement
Module replacement is a relatively
simple process. All modules in the
driver/amplifier assemblies plug directly
into the backplane board except for the
power amplifier module, that plug into a
blind mating connector. To replace a
module, refer to the following
procedure.
5.2: Initial Test Set Up of the
Transmitter
Switch On the main AC for the system
and the individual circuit breakers on
each assembly. Check that AC is present
to the system.
Loosen the two grip lock connectors,
located on the front panel, at the top
and bottom of the module,
counterclockwise until the module
releases. The Downconverter,
Upconverter and Controller/Power
Supply can then be gently pulled from
the unit. To remove the IPA Module in
the driver/amplifier chassis assembly,
the two cables, Input and Output,
connected to the rear of the chassis,
must be removed along with a 6/32” x
½” shipping screw, located between the
two connectors. After removal of the
failed module, slide the replacement
module in place and make certain it
connects to the backplane board. If the
replacement module is an IPA Module,
replace the two cables to the rear of the
driver/amplifier chassis assembly. The
6/32” x ½” shipping screw does not
LX Series, Digital, Rev. 0
Check that the RF output of the postfilter coupler assembly is terminated into
a dummy load of at least the rated
output of the system or connected to the
antenna for your system. While
performing the alignment, refer to the
Test Data Sheet for the transmitter and
compare the final readings from the
factory with the readings on each of the
modules. The readings should be very
similar. If a reading is way off, the
problem is likely to be in that module.
This transmitter operates using a SMPTE
310 input that connects to J27, the MPEG
Input Jack, located on the rear of the
Axciter Modulator Tray. Check that the
MPEG input is present. If used, check
5-1
Digital VHF HB Driver/Transmitter
w/Axciter Modulator
Chapter 5, Detailed Alignment Procedures
that the 10 MHz input from the GPS is
connected to J9 on the Axciter Modulator.
each Module in turn. These adjustments
must be completed when the System is
at the desired output power level.
The check of and the setup of the drive
level and output power of the transmitter
are completed using the LCD Display on
the control/power supply module. In the
Transmitter Set-Up menu and the Power
Control Screen, set the output power to
100% or the drive level needed to attain
the desired output power of the
transmitter. The transmitter must be in
the Manual Gain position when
readjusting the Forward Power.
(Example of screen is shown below).
5.3.2: Setting up of AGC
NOTE: The following adjustments are
completed using the LCD screen located
on the front panel of the Axciter
Modulator Tray. On the Axciter Main
Screen, push the button next to the
Upconverter tab on the right side of the
screen. This will open the Upconverter
Main Screen. See Figure 5-1 that
follows. Set the AGC to Manual by
selecting 3 on the key board entry. The
screen will now indicate AGC Manual.
Set the transmitter to full power using
the Driver/Amplifier LCD display while
viewing the Power Control Screen in the
Set Up Menu.
(Example of screen is shown below).
The adjustment of the linearity and
phase pre-distortion to compensate for
any nonlinear response of the Power
Amplifiers are controlled within the
Axciter Modulator Tray.
NOTE: Refer to the separate Axciter
Instruction Manual for detailed
information on the Axciter Modulator and
the Downconverter and Upconverter
Modules.
5.3.2.1: Setting up of AGC 1
To set up the AGC, first the AGC must
be activated. Locate the 8 position DIP
switch SW1 mounted on the Control
Board in the Axciter Upconverter Sled,
mounted in the Driver/Amplifier
Assembly. The Upconverter DIP Switch
Position 6 must be switched ON which
allows the user to modify the AGC 1 and
AGC 2 gain through the Axciter
Modulator.
5.3: Setting Up the Output Power of
the Transmitter using the Axciter
Modulator Tray
5.3.1: Adjusting Forward Power
Readings
When the transmitter utilizes external
amplifier modules, the Forward Power
readings for each of the amplifier
modules will need to be readjusted to a
100% Forward Power reading when the
System is at 100% Forward Power.
NOTE: The transmitter must be in the
Manual Gain position when readjusting
the Forward Power. These amplifier
readings can be found under the
Transmitter Details Main Screen, by
arrowing down to each Amp Set and then
LX Series, Digital, Rev. 0
On the Axciter Upconverter/
Downconverter Screen set AGC 1 to 1.5
Volts, by selecting 4 on the key board
entry. This will cause a detail screen to
appear prompting you to enter a
number value. Monitor the AGC 1 Gain
Value on the screen and increase or
decrease the value of the number
entered until the monitored reading is
1.5 Volts.
5-2
Digital VHF HB Driver/Transmitter
w/Axciter Modulator
Chapter 5, Detailed Alignment Procedures
Figure 5-1: Axciter Upconverter/Downconverter Main Screen
5.3.2.2: Setting up of AGC 2
5.3.3: Setting up of Overdrive
Threshold
NOTE: AGC2 is only used in systems
with external power amplifiers.
On the Axciter Upconverter Screen set
the Overdrive Threshold to 1.6 Volts, by
selecting 7 on the key board entry. This
will cause a detail screen to appear.
Increase or decrease the voltage as
needed until the monitored reading is
1.6 Volts.
On the Axciter Upconverter/
Downconverter Screen, set AGC 2 to 1.7
Volts, by selecting 5 on the key board
entry. This will cause a detail screen to
appear prompting you to enter a
number value. Monitor the AGC 2 Gain
Value on the screen and increase or
decrease the value of the number
entered until the monitored reading is
1.7 Volts.
Place the Transmitter into AGC Auto by
pushing the 3 of the key board entry on
the Axciter Upconverter Screen, which
will place the Transmitter AGC into Auto.
After the setting up of the AGC, the AGC
must be de-activated to prevent
accidental changes. The Upconverter
DIP Switch SW1 Position 6 must be
switched OFF which locks the AGC 1 and
AGC 2 gain.
LX Series, Digital, Rev. 0
5.3.4: Axciter Relay Sample Values
RF samples to the Axciter Relay K2:
These levels are to be measured with a
power meter before connecting them.
Your installation may require RF
5-3
Digital VHF HB Driver/Transmitter
w/Axciter Modulator
Chapter 5, Detailed Alignment Procedures
attenuators to be placed in line with the
samples to get them within the desired
range.
J1 connection to the FWD power sample
of the coupler before the mask filter.
Pre-Filter Sample, Non-Linear Distortion.
Level into Relay at J1 should be 0 dBm
to –10 dBm. –5 dBm typical
display on the Driver/Amplifier in the Set
Up menus.
Measure with a VOM, TP31-14, Red, and
TP31-12, Black, on the terminal block
TP31, located on the rear chassis of the
Driver/Amplifier Chassis Assembly.
Adjust R9, Forward Calibration
Adjustment, on the Dual Peak Detector
Board (1159965) for a reading of .8VDC
on the VOM. Locate the Forward Power
Adjust screen on the Driver/Amplifier
LCD display in the Set Up menus and
adjust the up or down arrow as needed
to achieve 100 % output power. This
completes the forward power set up.
J2 connection to the forward power
sample after the mask filter.
Post-Filter Sample, Linear Distortion.
Level into Relay at J2 should be 0 dBm
to –10 dBm. –5 dBm typical, but within
.5 dB of the J1 sample level.
5.3.5: Upconverter Downconverter
Adjustment
5.4.2: Reflected Power Calibration
On the Axciter Modulator, activate the
Upconverter Main screen by selecting
Upconverter, using the button next to
Upconverter on the right side of the
Axciter Main Screen. Activate the
Downconverter Output Gain by pushing
2 on the key board entry pad. Monitor
the DTVision Linear Display by pushing
the button next to the DTVision Linear
display on the right side of the Axciter
Main Screen. At the bottom of the
DTVision linear screen, locate the
reading next to RMS. If this reading is
between –10 dBm and 0 dBm no
adjustment is needed. If it is not, adjust
the “Downconverter Gain”, then view
the RMS value until it is within the –10
dBm to 0 dBm range.
Switch the transmitter to Standby.
Remove the connector that is on Jack
J2, on the Dual Peak Detector Board
(1159965), and replace with the
connector now on J1, also inserting a 10
dB pad in series. Switch the transmitter
to operate. Then adjust R10, Reflected
Calibration Adjustment, on the dual peak
detector board (1159965) for a .32VDC
reading, at TB31-13 and TB31-12 return,
on the terminal block TB31 mounted on
the rear of exciter/driver chassis
assembly. Switch the transmitter to
Standby. Move the connector back to J1
while removing the 10 dB pad. Replace
the original connector onto J2.
5.4: System Calibration of Forward
and Reflected Powers using the
Driver/Amplifier LCD Display
5.4.1: Forward Power Calibration
This completes the detailed alignment
procedures for the Digital transmitter.
If a problem occurred during the
alignment, help can be found by calling
Axcera field support at 724-873-8100.
Check that the transmitter is at 100%
output power, as shown on the LCD
LX Series, Digital, Rev. 0
5-4
APPENDIX A
DRAWINGS
Digital VHF HB Driver/Transmitter
w/Axciter Modulator
Appendix A, Drawings and Parts Lists
Innovator LX Series Digital System
Remote Site System Drawings.................................................................... 1309808
NOTE: The Drawings for the Axciter Modulator and the Upconverter Sled
and the Downconverter Sled Modules are found in the separate Axciter Manual.
Chassis Assembly, Driver, 220 VAC, HX-E
Interconnect ....................................................................................... 1305554
Backplane Board, Axciter
Schematic .......................................................................................... 1307308
Control/Power Supply Assembly, 220 VAC
Block Diagram .................................................................................... 1303889
Interconnect ....................................................................................... 1302062
Control Board
Schematic .......................................................................................... 1302023
Power Protection Board
Schematic .......................................................................................... 1302839
Switch Board
Schematic ....................................................................................... 1527-3406
Power Amplifier Assembly, DTV/DVB, VHF
Block Diagram .................................................................................... 1305824
Interconnect ....................................................................................... 1305823
Amplifier Control Board, VHF, DVB
Schematic .......................................................................................... 1309217
25 Watt VHF Driver Assembly (1305820)
Delta RF Data Sheet ....................................................................... PA25-VHF-H
200 Watt VHF Amplifier Assembly (1300167)
Delta RF Data Sheet ....................................................................... P200-VHF-H
LX Series, Digital, Rev. 0
A-1
APPENDIX B
SPECIFICATIONS SHEET
INNOVATOR LX
Low Power ATSC Transmitter 5W – 3kW
LU500ATD Shown
Designed to provide broadcasters with a product that will meet their needs
like no other solution on the market, this advanced low to medium power
transmitter line uses the latest LDMOS UHF or MOSFET VHF devices for
broadband operation across the entire operating band. This allows users to
minimize spare parts stock, which is especially important to group owners and
networks, and also enables simple and inexpensive channel changes.
The very compact and completely modular design uses a chassis/backplane
configuration with parallel amplifier and power supply modules which can be
removed and replaced while the transmitter is on the air.
Configurations are available in power levels from 10 watts to 6 kilowatts
analog and up to 3 kilowatts DTV, and all are manufactured in the USA by
Axcera - The RF Experts.
DIGITAL
INNOVATOR LX
DIGITAL
Low Power ATSC Transmitter 5W – 3kW
Options
Performance
Frequency Range
LLV
LHV
LU
Dual Exciter with Automatic Switcher
AC Surge Protector
Precise Frequency Kit
Stringent Mask Filter
Spare Parts Kit
54 to 88 MHz
174 to 216 MHz
470 to 806 MHz
Frequency Stability
w/Precise Frequency Option
±1kHz (max 30 day variation)
±2 Hz
Regulation of RF Output Power
3%
Out of Band - Compliant with FCC Mask
Channel Edge ±500kHz
6 MHz from Channel Edge
-47 dB or better
-110 dB or better
Signal to Noise (SNR)
33 dB typical
Data Interface
Input Rate
Input Interface
19.39 Mbps, 6 MHz Channel 		
SMPTE 310M
Test Signals
Internal PRBS 23 MPEG System
Other Frequencies - Consult Factory
Measured in 30 KHz RBW, relative to total average power
Above 8,500 feet - Consult Factory
General
Model Number
LU5ATD LHV10ATD LU50ATD LHV60ATD LU125ATD LU250ATD LU500ATD LU1000ATD
LLV10ATD LHV50ATD
LLV50ATD
Power Output (average)
5W
10W
50W
60W
125W
250W
500W
Output Connector
Simple Mask				
Stringent Mask
N/A		
7/8 EIA
Power Consumption (watts)
250W
275W
650W
725W
1000W
1700W
3400W
Input Power
Line Voltage (volts)
110-260 VAC		
195-260 VAC
Power Requirements				
Single Phase, 50 or 60 Hz
Size (H”x W”x D”)
8.75 x 19 x 23 (rackmount)		
55 x 22 x 34		
Weight (lbs)
45
45
45
250
340
360
400
Operational Temperature Range				
0 to +50ºC, derate 2ºC/1000 ft
Maximum Altitude3				
8500 ft (2600 m) AMSL
Operational Humidity Range				
0% to 95% non-condensing
RF Load Impedance					
50Ω
Model Number
1000W
1 5/8 EIA
6700W
76 x 22 x 34
550
LU1500ATD LU2000ATD LU2500ATD LU3000ATD
Power Output (average)
1500W
2000W
2500W
3000W
Output Connector
Simple Mask		
1 5/8 EIA
Stringent Mask
7/8 EIA		
1 5/8 EIA
Power Consumption (watts)
10,500W
13,500W
17,000W
20,500W
Input Power
Line Voltage (volts)		
220±10%
Power Requirements		
Single Phase, 50 or 60 Hz
Size (H”x W”x D”)
76 x 22 x 34		
76 x 44 x 34
Weight (lbs)
700
1030
1180
1330
Operational Temperature Range		
0 to +50ºC, derate 2ºC/1000 ft
Maximum Altitude3		
8500 ft (2600 m) AMSL
Operational Humidity Range		
0% to 95% non-condensing
RF Load Impedance		
50Ω
Specifications published here are current as of the date of publication of this document. Because we are continuously improving our products, Axcera reserves the right to change specifications without prior notice.
At any time, you may verify product specifications by contacting our office. Axcera views it’s patent portfolio as an important corporate asset and vigorously enforces its patents. Products or features contained
herein may be covered by one or more U.S. or foreign patents.
0707R4
© 2007 AXCERA
All Rights Reserved
103 Freedom Drive, PO Box 525, Lawrence, PA 15055
An Equal Opportunity Employer
t: 724-873-8100
f:724-873-8105
www.axcera.com		
Innovator LX 5W–3kW Tx

---

Source Exif Data:

File Type                       : PDF
File Type Extension             : pdf
MIME Type                       : application/pdf
PDF Version                     : 1.3
Linearized                      : No
Creator                         : TITLE PAGE.doc - Microsoft Word
Create Date                     : 2007:12:20 13:57:57
Title                           : TITLE PAGE.PDF
Author                          : mountsj
Producer                        : Acrobat PDFWriter 4.05 for Windows NT
Modify Date                     : 2008:01:02 14:18:38-05:00
Page Count                      : 60

EXIF Metadata provided by EXIF.tools