UBS Axcera CLV2TD 4 User Manual

Instruction Manual

Innovator,

CLV1TD/CLV1RD (500W) to

CLV4TD/CLV4RD (2000W)

VHF Low Band, ATSC Transmitter/

Regenerative Translator

w/Adaptive Modulator

UBS-Axcera Inc.

103 Freedom Drive • P.O. Box 525 • Lawrence, PA 15055-0525, USA

Phone: [phone] • Fax: [phone]

www.UBS-Axcera.com

• [e-mail]

RESTRICTIONS ON USE, DUPLICATION OR DISCLOSURE

OF PROPRIETARY INFORMATION

This document contains information proprietary to UBS-Axcera, to its affiliates or to a third party
to which UBS-Axcera may have a legal obligation to protect such information from unauthorized
disclosure, use or duplication. Any disclosure, use or duplication of this document or any of the
information herein for other than the specific purpose for which it was disclosed by UBS-Axcera is
expressly prohibited, except as UBS-Axcera may otherwise agree in writing. Recipient by
accepting this document agrees to the above stated conditional use of this document and this
information disclosed herein.

Copyright © 2012, UBS-Axcera

NOTE: This equipment has been tested and found to comply with the limits for a Class A
digital device, pursuant to part 15 of the FCC Rules. These limits are designed to pro-vide
reasonable protection against harmful interference when the equipment is operated in a
commercial environment. This equipment generates, uses, and can radiate radio frequency
energy and, if not installed and used in accordance with the instruction manual, may cause
harmful interference to radio communications. Operation of this equipment in a residential
area is likely to cause harmful interference in which case the user will be required to correct
the interference at his own expense.

Innovator CLV1TD/CLV1RD – CLV4TD/CLV4RD Table of Contents
ATSC Transmitter/Regenerative Translator

Table of Contents

Chapter 1 Introduction........................................................................................ 1

1.1 Manual Overview....................................................................................... 1

1.2 UBS-Axcera Numbering System Explanation.................................................. 1

1.3 Assembly Designators................................................................................ 1

1.4 Safety ..................................................................................................... 2

1.5 Contact Information................................................................................... 3

1.6 Return Material Procedure .......................................................................... 3

1.7 Limited One Year Warranty for UBS-Axcera Products ...................................... 4

Chapter 2 System Description............................................................................ 11

2.1 Product Architecture ................................................................................ 11

2.2 CX Drawer.............................................................................................. 11

2.3 Amplifier Drawers.................................................................................... 12

2.4 Air Cooled Assembly ................................................................................ 15

2.5 Power Supply Assembly............................................................................ 15

2.6 Optional Remote Interface with Dual Exciter Switching System ...................... 16

2.7 Pre-Filter Sample (Non-Linear Distortion).................................................... 17

2.8 Post-Filter Sample (Linear Distortion)......................................................... 17

Chapter 3 Unpacking, Installation and Maintenance............................................... 19

3.1 Unpacking .............................................................................................. 19

3.2 Installation Overview ............................................................................... 20

3.3 CX Drawer Slide-rail Installation ................................................................ 21

3.4 Amplifier Installation and Removal............................................................. 22

3.5 DC Power Supply Chassis Shelf and Module Installation and Removal.............. 23

3.6 AC Input Connections .............................................................................. 23

3.6.1 AC Distribution Box ........................................................................... 23

3.6.2 AC Distribution Panel ......................................................................... 24

3.6.3 Power Requirements.......................................................................... 24

3.7 Input and Output Connections................................................................... 24

3.7.1 CX Drawer........................................................................................ 24

3.7.1.1 Input Connections ....................................................................... 26

3.7.1.2 Output Connection....................................................................... 27

3.7.1.3 Power Monitoring Connections to J11 ............................................. 27

3.7.1.4 Remote Connections to J12........................................................... 28

3.7.2 Vertically Mounted HPA ...................................................................... 30

3.7.3 Optional K-Tech Receiver.................................................................... 31

3.8 Connecting your Transmitter to a TCP/IP Network........................................ 31

3.9 Maintenance ........................................................................................... 32

Chapter 4 Initial On Site Turn On Procedure......................................................... 33

4.1 Turn On Procedure .................................................................................. 33

4.2 Typical System Operating Parameters ........................................................ 34

4.3 Typical Problems, Indications and Causes in CU0TD/RD-2 or -3 Drawer........... 34

Chapter 5 Front Panel Pushbutton and LCD/LED Operation..................................... 35

5.1 CX Drawer.............................................................................................. 35

5.2 Vertical Amplifier Drawer.......................................................................... 36

5.3 LCD Front Panel Screens .......................................................................... 37

5.3.1 Implementation ................................................................................ 38

5.3.2 Operation Screens ............................................................................. 40

5.3.2 Set-up Screens ................................................................................. 45

Chapter 6 Innovator CX Series Web Ethernet Interface Kit ..................................... 51

6.1 Introduction ........................................................................................... 51

6.2 Logging In.............................................................................................. 51

Instruction Manual, Rev. 0 i 6/17/13

Innovator CLV1TD/CLV1RD – CLV4TD/CLV4RD Table of Contents
ATSC Transmitter/Regenerative Translator

6.3 Main Control/Monitoring Page.................................................................... 52

6.4 External Amplifier Status Page .................................................................. 54

6.5 View Events Page .................................................................................... 55

6.6 Configure Page ....................................................................................... 56

Chapter 7 Innovator CX Series SNMP Interfaces ................................................... 59

7.1 Introduction ........................................................................................... 59

7.2 SNMP Configuration ................................................................................. 59

Chapter 8 8VSB ATSC Modulator Board ............................................................... 61

Chapter 9: Descriptions of Boards in the CLV1TD/RD through CLV4TD/RD System64

9.1 CX Drawer Boards ................................................................................... 64

9.1.1 (A1) 8 VSB Demodulator Board (1308275)............................................ 64

9.1.1.1 Overview ................................................................................... 64

9.1.1.2 Microcontroller Functions.............................................................. 64

9.1.1.3 Jumper and DIP Switch Settings .................................................... 64

9.1.2 (A8) Control Card, Innovator CX (1312543) .......................................... 65

9.2 VHF Amplifier Boards ............................................................................... 66

9.2.1 Amplifier Design................................................................................ 66

9.2.2 Capture of the Test Values in the VHF Amplifier ..................................... 69

9.2.3 Functional Description of the Boards in the VHF Amplifier ........................ 70

9.2.3.1 (A1) Phase/Gain Board (1307780; Appendix B) ............................... 70

9.2.3.2 (A2) VHF Pre-Driver Board (1307278; Appendix B) .......................... 70

9.2.3.3 (A3) VHF Driver Board (1305101; Appendix B ................................. 70

9.2.3.4 (A4) 1:4 Splitter (1304714).......................................................... 71

9.2.3.5 (A5-A8) VHF Dual Stage Amplifier Board (1304514; Appendix B) ....... 71

9.2.3.6 2:1 Combiner ............................................................................. 72

9.2.3.7 (A13) 4:1 Combiner (1304767)..................................................... 72

9.2.3.8 (A14) Amplifier Module Control Board (1306830; Appendix B) ........... 73

9.3 (Optional) ASI to S310 Converter Module ................................................ 76

9.3.1 ASI Motherboard (1311179) ............................................................ 76

9.3.2 ASI to 310 Conversion Board, Non-SFN (1311219) ............................. 77

9.3.3 ASI to 310 Conversion Board, SFN (1309764).................................... 77

9.4 (Optional) K-Tech Receiver.................................................................... 77

Chapter 10: System Repair and Set-Up Procedures............................................... 78

10.1 Troubleshooting and Repair of the VHF Amplifier ........................................ 78

10.1.1 Safety Information........................................................................... 78

10.1.2 Troubleshooting .............................................................................. 78

10.1.2.1 Front Panel LEDs ....................................................................... 78

10.1.2.1 Polling Fault Indications.............................................................. 79

10.2 Exchanging Amplifiers ............................................................................ 79

10.2.1 Exchange of a Module ...................................................................... 79

10.2.2 Mounting a New Module.................................................................... 79

10.2.3 Final Steps ..................................................................................... 80

10.3 Adjusting the Output Power of an Amplifiers.............................................. 80

10.3.1 Adjustment Procedure ...................................................................... 80

10.4 Amplifier Connections.............................................................................. 81

APPENDIX A:...................................................................................................... 1

Innovator CLV2RD Regenerative Translator System with Adaptive Modulator Drawing

List ................................................................................................................... 1

Instruction Manual, Rev. 0 ii 6/17/13

Innovator CLV1TD/CLV1RD – CLV4TD/CLV4RD Introduction
ATSC Transmitter/Regenerative Translator

Chapter 1 Introduction

1.1 Manual Overview

This manual contains the description of the Innovator CLV1TD/CLV1RD through
CLV4TD/CLV4RD Transmitter/Regenerative Translator and the circuit descriptions of the
boards, which make up the system. The manual also describes the installation, setup
and alignment procedures for the system. Appendix A of this manual contains the
system level drawings for the Innovator CLV1TD/CLV1RD through CLV4TD/CLV4RD
ATSC Transmitter/Regenerative Translator System that was purchased.

NOTES: If your system contains Dual Exciters with a Remote Interface Panel and
Exciter Control Panel, information and drawings on the system and panels are contained
in the separate Remote Interface Panel instruction manual. Information on the optional
K-Tech Receiver or Signal Converter, if part of the system, is contained in the separate
manufacturers supplied manual. Information on the optional UPS, if part of the system,
is contained in the separate manufacturers supplied manual.

1.2 UBS-Axcera Numbering System Explanation

The UBS-Axcera numbering system is explained as follows - CLV2RD system.

C – CX Series, H – HX Series
LV – Low VHF Frequency Band, HV - High VHF Frequency Band, U - UHF Frequency Band
0 or X - Number of external Power Amplifier drawers
R - Regenerative translator, T - Transmitter, L - Echo cancelling repeater
D – ATSC, C - COFDM (DVB-T/H/T2), I - ISDB-T, No letter or blank means analog

1.3 Assembly Designators

UBS-Axcera has assigned assembly numbers, Ax designations such as A1, where
x=1,2,3…etc, to all assemblies, modules, and boards in the system. These designations
are referenced in the text of this manual and shown on the block diagram and
interconnect drawings provided in Appendix A.

Cables that are connected between boards within a drawer or assembly and cables that
are connected between the drawers, racks and cabinets are labeled using markers – see
Figure 1. There may be as few as two or as many as four Markers on any one cable.
These markers are read starting farthest from the connector. If there are four Markers,
the marker farthest from the connector is the system number such as system 1 or
translator 2. The next or the farthest Marker is the rack or cabinet “A” number on an
interconnect cable or the board “A” number when the cable is within a drawer. The next
number on an interconnect cable is the Drawer location or Board “A” number. The
marker closest to the connector is the jack or connector “J” number on an interconnect
cable or the jack or connector “J” number on the board when the cable is within a
drawer.

4

Figure 1: Marker Identification Drawing

Instruction Manual, Rev. 0 1

32

1

Innovator CLV1TD/CLV1RD – CLV4TD/CLV4RD Introduction
ATSC Transmitter/Regenerative Translator

1.4 Safety

The Innovator CLV1TD/CLV1RD – CLV4TD/CLV4RD ATSC Transmitter/Regenerative
Translator systems manufactured by UBS-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 system.

Hazardous Accessibility – UBS-Axcera has made attempts to provide appropriate
connectors, wiring and shields to minimize hazardous accessibility.

Circuit Breakers and Wiring – All circuit breakers and wire are UL and CE certified and
are rated for maximum operating conditions.

Single Point Breaker or Disconnect - The customer should provide a single point
breaker or disconnect at the breaker box for the main AC input connection to the
transmitter.

Transmitter Ratings - The transmitter ratings are provided in the text of this manual
along with voltage and current values for the equipment.

Protective Earthing Terminal – A main protective earthing terminal is provided for
equipment required to have protective earthing.

Read All safety Instructions – All of the safety instructions should be read and
understood before operating this equipment.

Retain Manuals – The manuals for the system should be retained at the system site for
future reference. UBS-Axcera provides two manuals for this purpose; one manual can be
left at the office while the other can be kept at the site.

Heed all Notes, Warnings, and Cautions – All of the notes, warnings, and cautions
listed in this safety section and throughout the manual must be followed.

Follow Operating Instructions – All of the operating and use instructions for the
system should be followed.

Cleaning – Unplug or otherwise disconnect all power from the equipment before cleaning.
Do not use liquid or aerosol cleaners. Use only 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 system, and to protect the unit from
overheating, these openings must not be blocked.

Servicing – Do not attempt to service this product yourself until becoming familiar with
the equipment. If in doubt, refer all servicing questions to qualified UBS-Axcera service
personnel.

Replacement Parts – When replacement parts are used, be sure that the parts have the
same functional and performance characteristics as the original part. Unauthorized
substitutions may result in fire, electric shock, or other hazards. Please contact the UBS­Axcera Technical Service Department if you have any questions regarding service or
replacement parts.

Instruction Manual, Rev. 0 2

Innovator CLV1TD/CLV1RD – CLV4TD/CLV4RD Introduction
ATSC Transmitter/Regenerative Translator

1.5 Contact Information

The UBS-Axcera Field Service Department can be contacted by PHONE at 724-873-8100
or by FAX at 724-873-8105.

Before calling UBS-Axcera, please be prepared to supply the UBS-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 your Name and the Call Letters for the station?

2. What are the model number and type of system?

3. Is the system digital or analog?

4. How long has the system been on the air? (Approximately when was the system

installed?)

5. What are the symptoms being exhibited by the system? Include the current front

panel LCD readings and what the status LED is indicating on the front panel of
the drawer. If possible, include the LCD readings before the problem occurred.

1.6 Return Material Procedure

To insure the efficient handling of equipment or components that have been returned for
repair, UBS-Axcera requests that each returned item be accompanied by a Return
Material Authorization Number (RMA#). The RMA# can be obtained from any UBS­Axcera Field Service Engineer by contacting the UBS-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 UBS-Axcera.

When equipment is sent to the field on loan, the RMA# is included with the unit. The RMA#
is intended to be used when the unit is returned to UBS-Axcera. In addition, all shipping
material should be retained for the return of the unit to UBS-Axcera.

Replacement assemblies are also sent with the 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 UBS-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:

UBS-Axcera

103 Freedom Drive

P.O. Box 525

Lawrence, PA 15055-0525 USA

For more information concerning this procedure, call the UBS-Axcera Field Service
Department at 724-873-8100.

UBS-Axcera can also be contacted through e-mail at [e-mail] and on the
Web at www.UBS-Axcera.com.

Instruction Manual, Rev. 0 3

Innovator CLV1TD/CLV1RD – CLV4TD/CLV4RD Introduction
ATSC Transmitter/Regenerative Translator

1.7 Limited One Year Warranty for UBS-Axcera Products

UBS-Axcera warrants each new product that it has manufactured and sold against
defects in material and workmanship under normal use and service for a period of one
(1) year from the date of shipment from UBS-Axcera's plant, when operated in
accordance with UBS-Axcera's operating instructions. This warranty shall not apply to
tubes, fuses, batteries, bulbs or LEDs.

Warranties are valid only when and if (a) UBS-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) UBS-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 UBS-Axcera) repair or alteration. UBS-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 UBS-Axcera's sole discretion) any defective parts free of charge (F.O.B.

UBS-Axcera’s plant) and/or (b) crediting (in UBS-Axcera's sole discretion) all or a portion
of the purchase price to the buyer.

Equipment furnished by UBS-Axcera, but not bearing its trade name, shall bear no
warranties other than the special hours-of-use or other warranties extended by or
enforceable against the manufacturer at the time of delivery to the buyer.

NO WARRANTIES, WHETHER STATUTORY, EXPRESSED, OR IMPLIED, AND NO
WARRANTIES OF MERCHANTABILITY, FITNESS FOR ANY PARTICULAR
PURPOSE, OR FREEDOM FROM INFRINGEMENT, OR THE LIKE, OTHER THAN AS
SPECIFIED IN PATENT LIABILITY ARTICLES, AND IN THIS ARTICLE, SHALL
APPLY TO THE EQUIPMENT FURNISHED HEREUNDER.

Instruction Manual, Rev. 0 4

Innovator CLV1TD/CLV1RD – CLV4TD/CLV4RD Introduction
ATSC Transmitter/Regenerative Translator

) WARNING!!!

½ HIGH VOLTAGE ¾

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 OR THE ANTENNA
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.

Instruction Manual, Rev. 0 5

Innovator CLV1TD/CLV1RD – CLV4TD/CLV4RD Introduction
ATSC Transmitter/Regenerative Translator

EMERGENCY FIRST AID INSTRUCTIONS

Personnel engaged in the installation, operation, or maintenance of this equipment are
urged to become familiar with the following rules both in theory and practice. It is the
duty of all operating personnel to be prepared to give adequate Emergency First Aid and
thereby prevent avoidable loss of life.

RESCUE BREATHING

1. Find out if the person is
breathing.

You must find out if the
person has stopped breathing.
If you think he is not
breathing, place him flat on
his back. Put your ear close to
his mouth and look at his
chest. If he is breathing you
can feel the air on your
cheek. You can see his chest
move up and down. If you do
not feel the air or see the
chest move, he is not
breathing.

2. If he is not breathing,
open the airway by tilting his
head backwards.

Lift up his neck with one
hand and push down on his
forehead with the other. This
opens the airway. Sometimes
doing this will let the person
breathe again by himself.

SKIN REDDENED: Apply ice cold water to
burned area to prevent burn from going
deeper into skin tissue. Cover area with 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.

BURNS

Cover area with clean sheet or cloth to keep
away air. Treat victim for shock and take to
hospital.

EXTENSIVE BURN - SKIN BROKEN: Cover
area with clean sheet or cloth to keep away
air. Treat victim for shock and take to
hospital.

3. If he is still not breathing,
begin rescue breathing.

-Keep his head tilted
backward. Pinch nose shut.

-Put your mouth tightly over
his mouth.

-Blow into his mouth once
every five seconds

-DO NOT STOP rescue
breathing until help arrives.

LOOSEN CLOTHING - KEEP
WARM

Do this when the victim is
breathing by himself or help
is available. Keep him as
quiet as possible and from
becoming chilled. Otherwise
treat him for shock.

Instruction Manual, Rev. 0 6

Innovator CLV1TD/CLV1RD – CLV4TD/CLV4RD Introduction
ATSC Transmitter/Regenerative Translator

dBm, dBw, dBmV, dBµV, & VOLTAGE

EXPRESSED IN WATTS

50 Ohm System

WATTS PREFIX dBm dBw dBmV
1,000,000,000,000 1 TERAWATT +150 +120
100,000,000,000 100 GIGAWATTS +140 +110
10,000,000,000 10 GIGAWATTS +130 +100
1,000,000,000 1 GIGAWATT +120 + 99
100,000,000 100 MEGAWATTS +110 + 80
10,000,000 10 MEGAWATTS +100 + 70
1,000,000 1 MEGAWATT + 90 + 60
100,000 100 KILOWATTS + 80 + 50
10,000 10 KILOWATTS + 70 + 40
1,000 1 KILOWATT + 60 + 30
100 1 HECTROWATT + 50 + 20
50 + 47 + 17
20 + 43 + 13
10 1 DECAWATT + 40 + 10
1 1 WATT + 30 0 + 77 +137 7.07V

0.1 1 DECIWATT + 20 - 10 + 67 +127 2.24V

0.01 1 CENTIWATT + 10 - 20 + 57 +117 0.707V

0.001 1 MILLIWATT 0 - 30 + 47 +107 224mV

0.0001 100 MICROWATTS - 10 - 40

0.00001 10 MICROWATTS - 20 - 50

0.000001 1 MICROWATT - 30 - 60

0.0000001 100 NANOWATTS - 40 - 70

0.00000001 10 NANOWATTS - 50 - 80

0.000000001 1 NANOWATT - 60 - 90

0.0000000001 100 PICOWATTS - 70 -100

0.00000000001 10 PICOWATTS - 80 -110

0.000000000001 1 PICOWATT - 90 -120

dBµV

TEMPERATURE CONVERSION

°F = 32 + [(9/5) °C]

°C = [(5/9) (°F - 32)]

VOLTAGE

Instruction Manual, Rev. 0 7

Innovator CLV1TD/CLV1RD – CLV4TD/CLV4RD Introduction
ATSC Transmitter/Regenerative Translator

USEFUL CONVERSION FACTORS

TO CONVERT FROM TO MULTIPLY BY

mile (US statute) kilometer (km) 1.609347
inch (in) millimeter (mm) 25.4
inch (in) centimeter (cm) 2.54
inch (in) meter (m) 0.0254
foot (ft) meter (m) 0.3048
yard (yd) meter (m) 0.9144
mile per hour (mph) kilometer per hour(km/hr) 1.60934
mile per hour (mph) meter per second (m/s) 0.44704
pound (lb) kilogram (kg) 0.4535924
gallon (gal) liter 3.7854118
U.S. liquid
(One U.S. gallon equals 0.8327 Canadian gallon)
fluid ounce (fl oz) milliliters (ml) 29.57353
British Thermal Unit watt (W) 0.2930711
per hour (Btu/hr)
horsepower (hp) watt (W) 746

NOMENCLATURE OF FREQUENCY BANDS

FREQUENCY RANGE DESIGNATION

3 to 30 kHz VLF - Very Low Frequency
30 to 300 kHz LF - Low Frequency
300 to 3000 kHz MF - Medium Frequency
3 to 30 MHz HF - High Frequency
30 to 300 MHz VHF - Very High Frequency
300 to 3000 MHz UHF - Ultrahigh Frequency
3 to 30 GHz SHF - Superhigh Frequency
30 to 300 GHz EHF - Extremely High Frequency

LETTER DESIGNATIONS FOR UPPER FREQUENCY BANDS

LETTER FREQ. BAND

L 1000 - 2000 MHz
S 2000 - 4000 MHz
C 4000 - 8000 MHz
X 8000 - 12000 MHz
Ku 12 - 18 GHz
K 18 - 27 GHz
Ka 27 - 40 GHz
V 40 - 75 GHz
W 75 - 110 GHz

Instruction Manual, Rev. 0 8

Innovator CLV1TD/CLV1RD – CLV4TD/CLV4RD Introduction
ATSC Transmitter/Regenerative Translator

RETURN LOSS VS. VSWR

0

-10

-20

R
E
T
U
R
N

L
O
S
S

-30

dB

-40

-50

-60

1.001 1.01 1.1 2.0

-70

VSWR

Instruction Manual, Rev. 0 9

Innovator CLV1TD/CLV1RD – CLV4TD/CLV4RD Introduction
ATSC Transmitter/Regenerative Translator

ABBREVIATIONS/ACRONYMS

AC: Alternating Current

AFC: Automatic Frequency
Control

AGC Automatic Gain Control

ALC: Automatic Level Control

AM: Amplitude Modulation

AGC: Automatic Gain Control

ATSC: Advanced Television

Systems Committee (Digital)

AWG: American Wire Gauge

B/D: Block Diagram

BER: Bit Error Rate

BW: Bandwidth

COFDM: Coded Orthogonal Frequency

Division Multiplexing
modulation scheme.

CLV2RD: Line C, Frequency LB VHF,

# of HPA’s 2, System
Regenerative Translator,
Modulation Standard ATSC.

DC: Direct Current

D/A: Digital to Analog

DSP: Digital Signal Processing

DTV: Digital Television

dB: Decibel

dBm: Decibel referenced to

1 milliwatt

dBmV: Decibel referenced to
1 millivolt

dBw: Decibel referenced to 1 watt

FEC: Forward Error Correction

FM: Frequency Modulation

FPGA: Field Programmable Gate

Array

Hz:

Hertz

I/C: Interconnect

ICPM: Incidental Carrier Phase
Modulation

I/P: Input

IF: Intermediate Frequency

LED: Light emitting diode

LSB: Lower Sideband

LDMOS: Lateral Diffused Metal Oxide

Semiconductor Field Effect
Transistor

MPEG: Motion Pictures Expert
Group

NTSC: National Television
Systems Committee (Analog)

O/P: Output

PLL: Phase Locked Loop

PCB: Printed Circuit Board

QAM: Quadrature Amplitude

Modulation

RD: Regenerative
Translator, Digital

SMPTE: Society of Motion Picture
and Television Engineers

TD: Transmitter, Digital

VSB: Vestigial Side Band

Instruction Manual, Rev. 0 10

Innovator CLV1TD/CLV1RD – CLV4TD/CLV4RD System Description
ATSC Transmitter/Regenerative Translator

Chapter 2 System Description

2.1 Product Architecture

The Innovator CX Series Systems can be configured as DTV Transmitters (i.e CLV2TD)
or Regenerative Translators (i.e CLV2RD). The DTV Transmitter (TD) takes an ASI input
and converts it to an On-Channel DTV RF output signal. The Regenerative Translator
(RD) accepts an On-Channel RF signal (-79 to –8 dBm) and converts it to an On-Channel
DTV RF output signal. If an optional preamp is present in the system, it is connected to
the output of the receive antenna and amplifies the weak signal approximately 20 dB.

In multi drawer systems, the CX drawer is configured as an exciter/driver used to drive
additional power amplifier drawers; a single amplifier drawer can operate at 500 Watts
ATSC; two amplifier drawers can operate at 1000 Watts ATSC; three amplifier drawers
can operate at 1500 Watts ATSC; and four amplifier drawers can operate at 2000 Watts
ATSC.

The Innovator CX Series system provides Adaptive Linear and Non-linear correction
capability for the transmission path as well as internal test sources that are used during
initial system installation. If your system contains the Optional Internal GPS Kit, the
output of the GPS Antenna connects to the J5 TNC connector on the rear panel of the CX
drawer. This kit supplies 10 MHz and 1 PPS references for use in the CX drawer.

2.2 CX Drawer

The CX drawer contains the (A4) 8VSB ATSC Digital Modulator (1316294), the (A15)
Downconverter (1316715) and the (A16) Capture Board (1316716). The drawer also
contains the (A6) Amplifier Assembly, the (A7) Output Detector Board, the (A8)
Innovator CX Control Board (1312543), the (A10) 24VDC Power Supply and the (A9)
12V Power Supply. To make the system a regenerative translator, the Demod Kit

(1316534) supplies the (A1) 8 VSB Demodulator Board (1308275) for the drawer.

When the system is configured as an ATSC Transmitter (TD), the ASI “A” input at (J1) is
connected directly to the input jack (J30 or ASI IN1), and the ASI “B” input at (J2) is
connected directly to the input jack (J31 or ASI IN2), on the (A12) 8 VSB Modulator
Board. The 8 VSB Modulator Board automatically selects the ASI “A” or “B” input,
depending on which connector the input signal is present on.

When configured to operate as a Regenerative Translator (RD), the DTV ON Channel RF
Input at (J1 or J5), (-8 to -79 dBm) is connected to the Tuner Input Jack on the (A1)
8 VSB Demodulator Board (1308275) supplied with the Demod kit. The 8 VSB
Demodulator Board converts the DTV input to a SMPTE-310 output at (J13), which is
connected to the input jack on the (A12) 8 VSB Modulator Board. The output of the 8

VSB modulator board (at the RF output jack X-502) is connected to J1 on the (A6)
amplifier assembly.

The 8 VSB Modulator Board converts the ASI or SMPTE-310M input to a digital RF TV
channel frequency in the range of 54 MHz - 88 MHz.

The 8 VSB Modulator Board’s RF on channel signal is connected to J1 on the amplifier
assembly, which is connected to the (A6-A4) ALC Board (1315006). The ALC board is
used to control the drive power to the High Power Amplifier chain.

Instruction Manual, Rev. 0 11

Innovator CLV1TD/CLV1RD – CLV4TD/CLV4RD System Description
ATSC Transmitter/Regenerative Translator

The (A6) Amplifier Assembly (1316313) is made up of the (A6-A1) 1W VHF Amplifier
Board (1310282) and the (A6-A2) the BLF881 Single Stage Amplifier Board (1314882).
The assembly has approximately 35 dB of gain. The amplified output at approximately
+37 dBm is connected to the (A7) Output Detector Board (1312207) which provides
forward (2V=100%) and reflected (2V=25%) power samples to the CX Control Board
(1312543) for metering and monitoring purposes.

An output power sample is also supplied to the front panel sample jack J15, which is a
50 Ohm BNC-type connector. The typical sample value is approximately 60dB down
from the output power level of the drawer.

The RF output is cabled to J9 the “N-type” connector RF output jack on the rear panel of
the drawer. The CX drawer RF output is then connected to the High Power Amplifier
Assembly RF Input located on the rear panel of the assembly.

Note: Systems with 2 CX drawers will include a Remote Interface with Dual Exciter
Switching system that includes an Exciter Output Routing Switch. In this case, the
amplifier assembly RF input will be connected to the Routing Switch output.

2.3 Amplifier Drawers

Each VHF amplifier assembly serves to amplify the RF signal delivered by the exciter to
the power level needed to attain the full rated output power of the transmitter. Nominal

transmitter output power is achieved by adding the parallel connection of individual
amplifier assemblies, within a cabinet assembly, and then the adding of a number of
multiple amplifier cabinet assemblies. For system with two or more amplifier drawers,
the high power amplifier assembly includes a quadrature splitter , which feeds up to 4
VHF amplifier drawers (1308727) via an N-typ input (J1).

The control and operating parameters of the amplifier assembly’s amplifier drawers are
displayed on the LCD Screen on the driver drawer.

The amplifier operates over the VHF Low Band TV frequency spectrum from 54 MHz to
88 MHz without any special tuning requirements. It is a three-stage amplifier design
formed by a pre-driver, driver, and final stage as shown in Figure 2; all stages
incorporate technology. The driver is a single stage amplifier module whose output is
split four ways. The final stage is made up of four identical power modules. Each power
module contains a dual stage amplifier whose outputs are combined in a 2-way hybrid
combiner. The four 2-way hybrid combiner outputs are connected to a 4-way combiner
assembly whose output is the RF output of the individual amplifier assembly.

The features of the VHF amplifier assembly include:

• All amplifying stages are equipped with transistors

• Operates over the complete frequency band without special tuning requirements

• High redundancy due to the parallel connection of many power transistors

• Mean junction temperature <120° C

• Important operating parameters displayed in the transmitter control assembly

• Multiple fault protection circuitry against mismatch, overvoltage, overcurrent and

overtemperature conditions

Instruction Manual, Rev. 0 12

Innovator CLV1TD/CLV1RD – CLV4TD/CLV4RD System Description
ATSC Transmitter/Regenerative Translator

The amplifier possesses multiple fault-protection circuits that prevent damage to the
power transistors during critical operating conditions, such as high mismatch,
overtemperature, overcurrent, or overvoltage. Important operating parameters, such as
drain currents, operating voltages, RF powers, and temperatures are polled and
displayed in the transmitter control assembly.

Figure 2: VHF LB Amplifier Assembly

The paralleling network of the amplifier is arranged so that it continues to operate at
reduced power if a module fails. The remaining available power is given by:

P

rem

= P

⋅ ([m - n] / m)

nom

2

where:

= remaining power

P

rem

= nominal power

P

nom

m = number of modules
n = number of failed modules

Figure 3: Remaining Power after Failure of Amplifier Modules

Instruction Manual, Rev. 0 13

Innovator CLV1TD/CLV1RD – CLV4TD/CLV4RD System Description
ATSC Transmitter/Regenerative Translator

When multiple amplifier drawers are used, the 7-16” RF output (J2) of each amplifier
drawer is combined using a hybrid or progressive combiner (system dependant).

Systems with 2 amplifiers and a hybrid combiner include a reject load, which provide
isolation protection for the operating power amplifier if the second amplifier fails; any
reflected energy will be dissipated by the 500W load. The reject load includes thermal
switches which monitor the temperature of the load and provide an over-temperature
fault (if it occurs) to the CX Exciter(s) through the system metering board(s).

Systems with 3 amplifiers and a progressive combiner include multiple reject loads,
which provide isolation protection for the operating power amplifiers if one of the
amplifiers fails. If the first or second amplifier fails, any reflected energy will be
dissipated by the 500W load. If the third amplifier fails, any reflected energy will be
dissipated by the 1kW load. The reject loads include thermal switches which monitor the
temperature of the load and provide an over-temperature fault (if it occurs) to the CX
Exciter(s) through the system metering board(s).

The combiner 1-5/8” output is connected to a pre-filter coupler, which provides forward
power feedback signals for Non-linear Pre-correction as well as a reflected power
feedback signal for system metering.

The pre-filter coupler forward power sample (FWD1) is connected directly to the RF
Input 1 jack (J3), located on the rear panel of the CX drawer(s). This forward power
sample is used for Non-linear Pre-correction. In dual CX drawer systems, the output
sample is connected to a 2-way splitter (A105), which is feed directly to the RF Input 1
jack (J3), located on the rear panel of the CX drawers.

The output of the pre-filter coupler is connected to a harmonic low pass filter (system
dependant), digital band pass filter and post-filter coupler.

The post-filter coupler provides forward power samples for Linear Pre-correction and
system metering as well as a reflected power sample for system metering. The pre-filter
coupler, filters and post filter coupler are all installed outside of the cabinet.

In single CX drawer systems, the post-filter coupler forward power sample is connected
to the RF Input 2 jack (J4), located on the rear panel of the CX drawer through a 2-way
splitter (A5). This forward power sample is used for Linear Pre-correction. In dual CX
systems, the forward power sample (FWD1) is connected to a 2-way splitter (A115),
which is connected directly to the RF Input 2 jack (J4), located on the rear panel of the
CX drawers.

In single CX drawer systems, the post-filter coupler forward power sample is also
connected to the RF input (J3), located on the System Metering board (1312666)
through a 2-way splitter (A5). The post-filter coupler reflected power sample is
connected directly to the RF input (J8), located on the System Metering board. The
System Metering board is connected to the CX Exciter, via the Exciter’s serial ports (J11
and J13).

In dual CX drawer systems, the post-filter coupler forward power sample (FWD2) is
connected to a 2-way splitter (A5), which is conected directly to the RF input (J3),
located on two System Metering boards (1312666). The post-filter coupler reflected
power sample (REFL2) is connected to a 2-way splitter (A15), which is connected
directly to the RF input (J8), located on two System Metering boards.

Instruction Manual, Rev. 0 14

Innovator CLV1TD/CLV1RD – CLV4TD/CLV4RD System Description
ATSC Transmitter/Regenerative Translator

Each System Metering board is connected to an individual CX Exciter, via the Exciter’s
serial ports (J11 and J13).

The System Metering Board(s) (1312666) provides over-temperature and other
parameters to the CX Exciter(s), in addition to the forward and reflected power samples.

The amplifier assembly also include an air cooling assembly and a DC power supply
assembly.

2.4 Air Cooled Assembly

The air cooling assembly consists of four axial fans, which are mounted under the VHF
Amplifier drawers. The input air is drawn through the front of the cabinet and forced up
through the amplifier drawers and out of the top of the cabinet. WARNING: Do not
block the input or output air flow to the cabinet.

2.5 Power Supply Assembly

Figure 4: AC Wiring Harness VHF Amplifier Cabinet

Instruction Manual, Rev. 0 15

Innovator CLV1TD/CLV1RD – CLV4TD/CLV4RD System Description
ATSC Transmitter/Regenerative Translator

The DC voltages to the VHF amplifier assemblies mounted in each VHF amplifier cabinet
are supplied by the switching power supplies, which are mounted in a power supply
chassis shelf located in the same cabinet.

The supplies are connected in parallel via the capacitor bank mounted in the rear of the
cabinet. The power supplies operate at +48Vdc and are not monitored by the control
system. They have their own internal protection circuitry and are ON and enabled when
AC power is applied.

The power supply shelf can be configured with 1, 2, 3, or 4 rectifiers depending on the
configuration of the system. A 1kW transmitter typically requires 3 rectifiers, leaving
one empty slot, which can be populated with a 4

th

rectifier providing N+1 power supply
redundancy (optional). Contact UBS-Axcera for more details on the configuration of
your system.

The individual power supply modules are "hot swappable". The lever built into the front
grill cover of the module can be used to disconnect and remove from the power supply
module from the chassis shelf.

The power supply modules are high efficiency (better than 93%) air cooled units. Each
module has a single phase input with a typical power factor of 0.98. The module inputs
are wired to accommodate the 230 VAC line input.

Refer to the AC wiring and interconnect drawings provided with your system for more
information. Contact UBS-Axcera if you have any questions regarding the AC
requirements.

2.6 Optional Remote Interface with Dual Exciter Switching System

The optional Remote Interface with Dual Exciter Switching system includes a Remote
Interface Panel (1314493) with ABS Control Panel (1314609) and Relay Interface board
(1311403) as well as a Signal Routing Board (1314440) and a Serial Loop-Through
Board (1307811). The system components listed above are installed at various
locations within the cabinet.

The Remote Interface Unit monitors the state of the Digital Exciters and provides
automatic exciter switching based on current conditions and operator inputs. The
Remote Interface Unit’s RJ-45 Ethernet connector is connected to a router, which
provides a user connection point for access to the transmitter Web and SNMP interfaces.

The Relay Interface Board RF output is connected to the Quadrature Splitter (1309334)
RF input.

The Serial Loop-Thru board and Signal Routing board provide the amplifier drawers with
system serial interface connections to the CX Exciter drawers and the Remote Interface
panel.

For detailed operating instructions, please refer to the CX Dual Exciter System and
Remote Interface Panel manual (1314493).

Instruction Manual, Rev. 0 16

Innovator CLV1TD/CLV1RD – CLV4TD/CLV4RD System Description
ATSC Transmitter/Regenerative Translator

2.7 Pre-Filter Sample (Non-Linear Distortion)

The pre-filter sample from the pre-filter coupler connects to (J3), the RF input 1 jack,
located on the rear panel of the driver drawer. This sample connects to the modulator
board where it is used in the correction system.

2.8 Post-Filter Sample (Linear Distortion)

The post-filter sample from the post-filter coupler connects to (J4), the RF input 2 jack,
located on the rear panel of the driver drawer. This sample connects to the modulator
board where it is used in the correction system.

IMPORTANT NOTES:

RF feedback sample lines must not be disturbed when adaptive pre-correction is
enabled. If a sample line is removed, the appropriate pre-correction mode must first be
disabled and only re-enabled after the feedback signal is re-connected. RF feedback
sample #1 is feedback for the non-linear pre-corrector system and sample #2 is used
for the linear pre-corrector system.

The adaptive pre-correction systems are likely to be significantly affected if the sense
port is moved to another coupler port with a different level or if a sample level is
changed significantly (a few dB). If the linear pre-corrector system is exposed to this
scenario it may generate a notable ripple in the output that may translate into an
increase (or decrease) of the measured RMS level. Should this situation occur, the only
way to restore proper operation is to reset the linear corrector using the controller's 'Set
To Neutral' command or the web interface's 'Reset Current Curve To Factory' command
and allow the pre-corrector system to start over again.
The On Channel RF output of the amplifier drawer either connects directly to the low
pass filter and digital mask filter and then to the antenna in single amplifier systems or
to a combiner, pre-filter coupler, low pass filter, the digital mask filter, post-filter output
coupler and finally to the antenna in multiple amplifier systems. The post-filter output
coupler provides a forward and a reflected power sample to the system metering board
which detects the samples and supplies the forward and reflected power levels to the
exciter/driver drawer for use in the metering circuits.

Instruction Manual, Rev. 0 17

Innovator CLV1TD/CLV1RD – CLV4TD/CLV4RD System Description
ATSC Transmitter/Regenerative Translator

This page has intentionally been left blank.

Instruction Manual, Rev. 0 18

Innovator CLV1TD/CLV1RD – CLV4TD/CLV4RD Unpacking, Installation &

f

ATSC Transmitter/Regenerative Translator Maintenance

Chapter 3 Unpacking, Installation and Maintenance

3.1 Unpacking

UBS-Axcera certifies that upon leaving our facility all equipment was undamaged and in
proper working order. It is imperative that all packages be inspected immediately upon
arrival to verify that no damage occurred in transit to the site.

Inspect all packages for exterior damage and make note of any dents, broken seals, or
other indications of improper handling. Carefully open each package and inspect the
contents for damage.

Verify that all materials are enclosed as listed on the packing slip. Report any shortages
to UBS-Axcera. In the event any in transit damage is discovered, report it to the carrier.
UBS-Axcera is not responsible for damage caused by the carrier.

If the equipment is not going to be installed immediately, return all items to their
original packaging for safe storage. Save all packing material for future use. If
equipment is ever removed from the site, the original packaging will ensure its safe
transport.

HPA Assembly with

Splitter, HPA Modules

and Combiner

HPA Blower

Power Supply Shel

CX

Exciter/Driver

PDU

Figure 5: CLV2TD/RD Front View Typical Racking Plan

Instruction Manual, Rev. 0 19

Innovator CLV1TD/CLV1RD – CLV4TD/CLV4RD Unpacking, Installation &
ATSC Transmitter/Regenerative Translator Maintenance

HPA Assembly with

Splitter, HPA Modules

and Combiner

HPA Blower

Power Supply Shelves

K-tech Receiver (optional)

CX

Exciter/Driver

ABS Control Panel (optional)

Dual CX

Exciter/Driver (optional)

PDU

UPS (optional)

Battery (optional)

Figure 6: CLV3TD/RD Front View Typical Racking Plan

3.2 Installation Overview

The Innovator CX Series transmitters are designed for simple installation. Expensive
test equipment is not required for installation and set up and to keep a system
operational. An information decal, with Voltage Range, Current Range, Manufacturer,
Model and ratings is attached to the rear panel of the stand alone drawer or if mounted
in a cabinet, to the top of the frame above the door facing the rear of the cabinet. Prior
to installing the product, review the following items. Check that they been installed,
tested and/or inspected.

• Building Structure

• Electrical Systems

• Heating and Air Conditioning

• Receive Antenna or Satellite Dish and input cabling

• Optional ASI to S310 Converter, if needed

• Transmit Antenna and output transmission line

Instruction Manual, Rev. 0 20

Innovator CLV1TD/CLV1RD – CLV4TD/CLV4RD Unpacking, Installation &
ATSC Transmitter/Regenerative Translator Maintenance

The Innovator CX Series systems are 17” (43.2cm) wide standard rack mountable
drawers. They are sometimes supplied with side mounted Drawer Slides for ease of
installation and removal.

The CLV0TD/RD-1 through CLV0TD/RD-5 systems require a single CX exciter drawer
which occupies 3 RU, or 5.25” (13.3cm) of rack space.

The CLV1TD/RD through CLV4TD/RD systems require a single CX exciter drawer, as well
as the vertically mounted high power amplifier drawers. 14 RU, or 24.5” (62.23cm) of
rack space is required for the amplifier assembly which includes splitter and combiner
assemblies as well as an amplifier shelf, which can accommodate 1 to 4 amplifier
drawers. An additional 4RU, 7” (17.78cm) is required for the blower system and up to
2RU, or 3.5” (8.9cm) is required for the DC power supply shelves.

NOTE: The optional dual exciter/driver system requires an additional 4 RU, or 7”
(17.78cm) of rack space for mounting equipment in the cabinet; 3 RU, or 5.25”
(13.3cm) for the second Exciter/Driver drawer and 1 RU, or 1.75” (4.43cm) for the Exciter
Switcher panel.

Also needed for FCC compliance operation is an ATSC filter on the broadcast channel
that connects to the output of the CLV0TD/RD-1 thru CLV4TD/RD systems. Space must
be provided for the ATSC filter, and in some systems, for the circulator, splitter,
combiner, reject load, and low pass filter whose dimensions will vary depending on
manufacturer and channel. Refer to the vendor supplied information included with your
ATSC filter and low pass filter for specific dimensions. Make sure that the space
provided for the CX Series equipment is sufficient and includes the circulator, splitters,
combiner, reject load and external filters. Check that any additional equipment, which is
included in the system that extends above or to the side of the mounting rack, has
sufficient clearance space. Refer to the custom racking plan for the system, if prepared,
for detailed information.

3.3 CX Drawer Slide-rail Installation

If the system is pre-mounted in a cabinet skip this section.

Locate the drawer slide-rails included in the installation material for your system. Refer to
Figure 7 and the manufacturers instructions, included with the drawer slide-rails, for the
cabinet mounting instructions of the drawer slide-rails.

Install the left drawer slid-rail into the left side of the cabinet (as viewed from the rear).
Allow 3 RU, or 5.25” (13.3cm) of space between the CX drawers used in the CLV0TD/RD­1 through CU4TD/RD systems.

Space must also be provided for the splitter, combiner, ATSC filter and low pass filter (if
present) whose dimensions will vary depending on the manufacturer and the output
channel. Secure the left drawer slide-rail by connecting it to the front and rear mounting
bars using No. 10 screws and the bar nuts that have been provided.

Install the drawer slide-rail on the right side of the cabinet (as viewed from the rear)
making sure that it is aligned with the drawer slide-rail on the left side. Secure the slide­rail by connecting it to the front and rear mounting bars using No. 10 screws and the bar
nuts that have been provided. Repeat this process for any other drawers if purchased.
With both slide-rails in place, slide the drawer or drawers into the cabinet.

Instruction Manual, Rev. 0 21

Innovator CLV1TD/CLV1RD – CLV4TD/CLV4RD Unpacking, Installation &
ATSC Transmitter/Regenerative Translator Maintenance

Figure 7: Cabinet Slides

3.4 Amplifier Installation and Removal

WARNING: The High Power Amplifier weighs approximately 54 lbs (25kg) and
should be installed with caution.

For CLV1TD/RD through CLV4TD/RV systems with vertically mounted amplifier drawers,
the cabinet is equipped with a High Power Amplifier Assembly which houses 1 to 4 High
Power Amplifier drawers, as well as splitter and combiner assemblies and a blower
system. The user will be required to install the amplifier drawers as they are removed
prior to shipping.

Using two handlers, one located on each side of the amplifier, lift the amplifier and
position it level to the open space in the cabinet. Carefully place the bottom of the
amplifier onto the support shelf. Slowly slide the power amplifier into the cabinet until it
stops. There are two blind mate connectors (DC power and Serial Communication)
located on the amplifier rear panel which are aligned with corresponding connectors on
the Amplifier Assembly backplane. Ensure that the connectors are aligned properly and
slowly push the amplifier into the backplane until it stops. The amplifier should be
secured to the Amplifier Assembly using the No. 10 screws provided.

The user will also be required to install several front panel connectors – see Section

3.7.3.

The amplifier drawers can be replaced, but the transmitter must be placed in standby
first. The user must then switch the circuit breakers for the DC power supply shelves
OFF. Once this is done, the cables can be disconnected and the amplifier can be
removed from the assembly.

Instruction Manual, Rev. 0 22