Motorola MBV3-100S Operating instructions

Caution
These servicing instructions are for use by qualified personnel only. To reduce the risk of electrical shock, do not perform any servicing other than that
contained in the Installation and Troubleshooting Instructions unless you are qualified to do so. Refer all servicing to qualified service personnel.
Special Symbols That Might Appear on the Equipment
This symbol indicates that dangerous voltage levels are present within the equipment. These voltages are not
insulated and may be of sufficient strength to cause serious bodily injury when touched. The symbol may also appear
on schematics.
The exclamation point, within an equilateral triangle, is intended to alert the user to the presence of important
installation, servicing, and operating instructions in the documents accompanying the equipment.
For continued protection against fire, replace all fuses only with fuses having the same electrical ratings marked at
the location of the fuse.
Electrostatic discharge (ESD) can damage the MB100 unit and circuit card assemblies. Wear an antistatic wrist
strap attached to a chassis ground to prevent ESD damage.
Caring for the Environment by Recycling
When you see this symbol on a Motorola product, do not dispose of the product with residential or commercial waste.
Recycling your Motorola Equipment
Please do not dispose of this product with your residential or commercial waste. Some countries
or regions, such as the European Union, have set up systems to collect and recycle electrical and
electronic waste items. Contact your local authorities for information about practices established
for your region. If collection systems are not available, call Motorola Customer Service for
assistance.
Please visit www.motorola.com/recycle for instructions on recycling.
FCC Compliance
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 provide 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 Installation 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/her own expense.
CAUTION: Any changes or modifications not expressly approved by Motorola could void the user’s authority to operate this equipment under the rules
and regulations of the FCC.
Canadian Compliance
This Class A digital device complies with Canadian ICES-003.
Cet appareil numérique de la classe A est conforme À la norme NMB-003 du Canada.
Declaration of Conformity
We
Motorola, Inc.
101 Tournament Drive
Horsham, PA 19044, U.S.A.
declare under our sole responsibility that the
STARLINE®
Model MBV3–100*
to which this declaration relates is in conformity with one or more of the following standards:
EMC Standards
EN55022
EN50083-2
Safety Standards
EN60950-1
IEC60950-1
following the provisions of the Directive(s) of the Council of the European Union:
EMC Directive 2004/108/EC
Low Voltage Directive 2006/95/EC
WEEE Directive 2002/96/EC
RoHS Directive 2002/95/EC
Copyright © 2009 by Motorola, Inc.
All rights reserved. No part of this publication may be reproduced in any form or by any means or used to make any derivative work (such as
translation, transformation or adaptation) without written permission from Motorola, Inc.
Motorola reserves the right to revise this publication and to make changes in content from time to time without obligation on the part of Motorola to
provide notification of such revision or change. Motorola provides this guide without warranty of any kind, either implied or expressed, including, but
not limited to, the implied warranties of merchantability and fitness for a particular purpose. Motorola may make improvements or changes in the
product(s) described in this manual at any time.
MOTOROLA, STARLINE, LIFELINE, and the Stylized M Logo are registered in the US Patent & Trademark Office. All other product or service names are
the property of their respective owners. © Motorola, Inc. 2009
Contents
Section 1
Introduction
Using This Manual ........................................................................................................................................................................... 1-3
Related Documentation................................................................................................................................................................... 1-3
Document Conventions................................................................................................................................................................... 1-3
If You Need Help............................................................................................................................................................................... 1-4
Calling for Repairs ........................................................................................................................................................................... 1-4
Section 2
Overview
Ordering Matrix ................................................................................................................................................................................ 2-2
Housing............................................................................................................................................................................................. 2-3
Gaskets ............................................................................................................................................................................................. 2-5
Port Locations .................................................................................................................................................................................. 2-6
Power Supply ................................................................................................................................................................................... 2-6
Forward Path .................................................................................................................................................................................... 2-9
Return Path..................................................................................................................................................................................... 2-11
Ingress Control Switch.................................................................................................................................................................. 2-11
Options and Accessories.............................................................................................................................................................. 2-12
Section 3
Amplifier Setup
Proper Handling Procedures .......................................................................................................................................................... 3-1
Field Practice ........................................................................................................................................................................... 3-1
Bench Setup ............................................................................................................................................................................ 3-1
Forward Path Alignment.................................................................................................................................................................. 3-2
Before You Begin .................................................................................................................................................................... 3-2
STARLINE Forward Equalizers .............................................................................................................................................. 3-3
Example 1......................................................................................................................................................................... 3-3
Example 2......................................................................................................................................................................... 3-3
STARLINE Cable Simulators.................................................................................................................................................. 3-6
Input, Midstage, and Output Pads ......................................................................................................................................... 3-7
Flatness Control ...................................................................................................................................................................... 3-7
Directional Coupler Test Points............................................................................................................................................. 3-9
Bode Equalization ................................................................................................................................................................... 3-9
Amplifier Level Control........................................................................................................................................................... 3-9
Manual Gain Control......................................................................................................................................................... 3-9
MBV3-100* Installation and Operation Manual
ii
Contents
Vertical Automatic Drive Unit/QAM Automatic Drive Unit...............................................................................................3-11
VADU/VQADU Pads and Levels.....................................................................................................................................3-12
Return Path Alignment...................................................................................................................................................................3-12
Before You Begin...................................................................................................................................................................3-12
Alignment Procedure ............................................................................................................................................................3-13
Powering and Surge Protection ....................................................................................................................................................3-14
Section 4
Bench Testing
Before You Begin..............................................................................................................................................................................4-1
Test Equipment and Connections ..................................................................................................................................................4-2
Measuring Forward Gain .................................................................................................................................................................4-3
Example ............................................................................................................................................................................4-3
Testing Return Gain and Response................................................................................................................................................4-4
Example ............................................................................................................................................................................4-5
Completing the Test Procedures ....................................................................................................................................................4-5
Section 5
Installation
Aerial Installation..............................................................................................................................................................................5-1
Pedestal Installation.........................................................................................................................................................................5-3
Grounding .........................................................................................................................................................................................5-3
Section 6
Operating Tips
Using Amplifiers in Lower Frequency Systems ............................................................................................................................6-1
Using Amplifiers in Lower Gain Systems ......................................................................................................................................6-1
Appendix A
Specifications
Model MBV3-100*............................................................................................................................................................................. A-1
AC Current........................................................................................................................................................................................ A-2
Return Amplifier............................................................................................................................................................................... A-2
VADU Automatic Drive Unit............................................................................................................................................................ A-2
Appendix B
Torque Specifications
Abbreviations and Acronyms
MBV3-100* Installation and Operation Manual
Contents
iii
Figures
Figure 1-1 MBV3-100* — closed .................................................................................................................................................... 1-1
Figure 1-2 MBV3-100* — open ....................................................................................................................................................... 1-2
Figure 2-1 MBV3-100* — base and lid........................................................................................................................................... 2-1
Figure 2-2 MBV3-100* ordering matrix.......................................................................................................................................... 2-2
Figure 2-3 MB-HSG dimensions — top view ................................................................................................................................ 2-3
Figure 2-4 MB-HSG dimensions — side view............................................................................................................................... 2-3
Figure 2-5 Housing gaskets ........................................................................................................................................................... 2-5
Figure 2-6 Housing ports................................................................................................................................................................ 2-6
Figure 2-7 MPPS-II power pack...................................................................................................................................................... 2-7
Figure 2-8 MBV3-100* power supply ............................................................................................................................................. 2-8
Figure 2-9 Power passing fuse locations ..................................................................................................................................... 2-9
Figure 2-10 MBV3-100* block diagram........................................................................................................................................ 2-10
Figure 2-11 MBV3-100* options and accessories ...................................................................................................................... 2-13
Figure 3-1 Equalizer slope versus cable....................................................................................................................................... 3-5
Figure 3-2 Frequency versus cable slope .................................................................................................................................... 3-7
Figure 3-3 Flatness controls .......................................................................................................................................................... 3-8
Figure 3-4 MDR/10/1G/* board – top (left), bottom (right) ........................................................................................................... 3-8
Figure 3-5 ADU .............................................................................................................................................................................. 3-11
Figure 3-6 QADU ........................................................................................................................................................................... 3-11
Figure 4-1 Test equipment connections for bench sweeping .................................................................................................... 4-2
Figure 5-1 Center-conductor pin length ....................................................................................................................................... 5-1
Figure 5-2 Torque sequence .......................................................................................................................................................... 5-2
Tables
Table 2-1 MBV3-100* options and accessories.......................................................................................................................... 2-12
Table 3-1 Starline Forward Equalizers — SFE-100-* ................................................................................................................... 3-4
Table 3-2 STARLINE cable simulators .......................................................................................................................................... 3-6
Table 3-3 Gain reserve versus ambient temperature ................................................................................................................ 3-10
MBV3-100* Installation and Operation Manual
Section 1
Introduction
The Motorola® 1 GHz STARLINE® series of MiniBridger amplifiers, model MBV3-100*, accept a
single input and provide high operational gain to a single or dual output. The MBV3-100*
amplifier series meets Telcordia GR-1098 core voltage surge requirements using surge
waveforms as described in IEEE C62.41. The MBV3-100* is also FCC, CE, and CCC approved.
Features of the MBV3-100* include:
ƒ
1003 MHz power doubling technology in enhanced gallium arsenide (E-GaAs)
ƒ
3 balanced high-level outputs
ƒ
Several different modular diplex filter frequency split options
ƒ
Ergonomics
ƒ
60/90 VAC line power option
ƒ
Power factor corrected power supply
ƒ
Auto-controlled Bode equalization
ƒ
−20 dB directional coupler test points
ƒ
Optional return path ingress control accessories
ƒ
Two-way operation capability
ƒ
15-amp power passing
ƒ
Externally accessible test points
ƒ
Drop-in capability of new electronics chassis to older MB housings
Figure 1-1 illustrates a closed MBV3-100*.
Figure 1-1
MBV3-100* — closed
2
ASSEMBLED IN MEXICO
4
5
6
1
3
MBV3-100* Installation and Operation Manual
1-2
Introduction
Figure 1-2 illustrates an open MBV3-100*.
Figure 1-2
MBV3-100* — open
MBV3-100* Installation and Operation Manual
Introduction
1-3
Using This Manual
The following sections provide information and instructions to bench test, install, and operate
the MBV3-100*.
Section 1
Introduction provides a brief description of the product, identifies the information
contained in this manual, and gives the help line telephone number and repair return
information.
Section 2
Overview describes the MBV3-100* and includes details on the various options and their
functions.
Section 3
Amplifier Setup provides instructions for full configuration and forward- and return-path
alignment.
Section 4
Bench Testing describes the bench test procedures that are recommended before you
install the MBV3-100*.
Section 5
Installation provides instructions for installing the MBV3-100* and performing field
alignment.
Section 6
Operating Tips provides suggestions for handling field-encountered variables and
addressing maintenance tasks.
Appendix A
Specifications lists the applicable technical specifications for the MBV3-100* and options.
Appendix B
Torque Specifications provides the appropriate torque specifications for the screws,
clamps, connectors, and bolts used in the MBV3-100*.
Abbreviations
and Acronyms
The Abbreviations and Acronyms list contains the full spelling of the short forms used in
this manual.
This Installation and Operation Manual assumes that all channels are standard National
Television Standards Committee (NTSC) analog channels. Refer to catalog specifications for
further details pertaining to signal levels of digital channels above 550 MHz. For more
information regarding this product visit the web site:
http://www.motorola.com/Business/US-EN/Business+Product+and+Services/Cable+Broadband/RF+Amplifiers
This Installation and Operation Manual uses 1003 MHz as the reference frequency unless
another frequency is given. For example, quoted cable loss is understood to be at 1003 MHz.
Related Documentation
This Installation and Operation Manual is complete and you should not require any additional
documentation to install, test, or operate the MBV3-100* amplifier.
Document Conventions
Before you begin using the MBV3-100*, familiarize yourself with the stylistic conventions used
in this manual:
Bold type
Indicates text that you must type exactly as it appears or indicates a default value.
SMALL CAPS
Denotes silk screening on the equipment, typically representing front- and rear-panel
controls and input/output (I/O) connections, and LEDs.
* (asterisk)
Indicates that several versions of the same model number exist and the information applies
to all models; when the information applies to a specific model, the complete model number
is given.
Italic type
Denotes a displayed variable, or is used for emphasis.
MBV3-100* Installation and Operation Manual
1-4
Introduction
If You Need Help
If you need assistance while working with the MBV3-100*, contact the Motorola Technical
Support Call Center (TSCC):
ƒ Toll Free : 1-888-944-HELP (1-888-944-4357)
ƒ Direct: +1 847-725-4011or See Local Country Calling Numbers Below.
ƒ Motorola Online: http://businessonline.motorola.com
The TSCC is available 24 hours a day, 7 days a week, in addition, Motorola Online offers a
technical documentation, repair status, shipping information and low priority issue
creation/tracking. For specific Toll Free numbers when calling from outside of the United States
please refer to your product manual or our web page.
Calling for Repairs
If repair is necessary, call Motorola’s Repair Facility at 1-800-642-0442 for a Return for Service
Authorization (RSA) number before sending the unit. The RSA number must be prominently
displayed on all equipment cartons. The Repair Facility is open from 8:00 AM to 5:00 PM
Central Time, Monday through Friday.
For after hours, or international customers, a request for an RSA can be submitted via e-mail to
nogrepaircenter@motorola.com. Please include the following information in the e-mail:
ƒ
Shipping address (for returning the unit(s) to you)
ƒ
Contact name and phone number
ƒ
Serial number(s) of unit(s)
ƒ
Detailed description of problem(s) for each unit
When shipping equipment for repair, follow these steps:
1
Pack the unit securely.
2
Enclose a note describing the exact problem.
3
Enclose a copy of the invoice that verifies the warranty status.
4
Ship the unit PREPAID to the address indicated on the RSA form provided by Motorola.
For customers in Europe, the Middle East, and Africa (EMEA) contact the Technical
Assistance Centre (TAC) which offers the following high levels of services:
ƒ
Toll-free phone numbers where available – see list below
ƒ
24 hours a day, 7 days a week, multilingual technical assistance (Spanish, German, and
French)
ƒ
Central tracking of all issues utilizing the Clarify Call Management System
ƒ
Automated escalation management, both technical and issue related, if necessary through to
the high-level development teams or senior account management.
MBV3-100* Installation and Operation Manual
Introduction
1-5
The e-mail address for the Call Management System is: BCS.Helpdesk@motorola.com.
Or, you may call the following toll-free individual country phone numbers:
Country
Phone Number
Belgium
0-800-72-163
Denmark
80-88-6748
Finland
0-800-114-263
France
0-800-90-7038
Germany
0-800-18-73019
Hungary
06-800-18164
Ireland
1-800-55-9871
Israel Golden Lines
Israel Bezeq
Israel Barak
1-809-25-2071
1-809-42-9181
1-809-31-5435
Italy
800-788-304
Luxembourg
0-800-2-5310
NetherlandsHolland
0-800-022-0176
Norway
800-15-670
Poland
00-800-111-3671
Portugal
800-81-3461
Spain
900-99-1771
Sweden
020-79-0241
Switzerland
0-800-561-872
United Kingdom
8-800-404-8439
All other countries
+1 847 725 4011
If the toll-free number fails, please use +1 847 725 4011.
The new repair process enables you to track your issue by quoting your unique system ID or
Customer Service Report number.
MBV3-100* Installation and Operation Manual
Section 2
Overview
The MBV3-100* is a balanced three output amplifier used in CATV distribution systems. All
models are high-gain, three-stage hybrid amplifiers designed to drive both a cascade and a local
distribution system. The MBV3-100* is powered by the 60/90 VAC cable supply and can be
configured to pass this power to additional amplifiers and line extenders. Installation of the
return path enables two-way signal flow. Single output models are also available.
The standard model MBV3-100* includes an amplifier electronics module (base) and a power
supply (lid) furnished complete in the model MB-HSG housing as illustrated in Figure 2-1.
Figure 2-1
MBV3-100* — base and lid
MBV3-100* Installation and Operation Manual
2-2
Overview
Ordering Matrix
Several models of the MBV3-100* are available. The MBV3-100* is fully configured in the
factory per model requested. You can find the model name on labels on the outside of the
shipping carton, the side of the MBV3-100* housing, and the side of the electronics module.
Figure 2-2 identifies and describes the model strings. Not all combinations are available. See
current data sheets located on the Motorola online product catalog for a list of models available
and corresponding part numbers.
http://www.motorola.com/Business/US-EN/Business+Product+and+Services/Cable+Broadband/RF+Amplifiers
Figure 2-2
MBV3-100* ordering matrix
MBV3-100* Installation and Operation Manual
Overview
2-3
Housing
The MBV3-100* is furnished in an MB-HSG aluminum housing that protects the electronics
from weather and dissipates internally generated heat.
Figure 2-3 illustrates a top view of the MB-HSG housing and provides its dimensions.
ASSEMBLED IN MEXICO
Figure 2-3
MB-HSG dimensions — top view
Figure 2-4 illustrates a side view of the MB-HSG and provides its dimensions.
Figure 2-4
MB-HSG dimensions — side view
MBV3-100* Installation and Operation Manual
2-4
Overview
Coaxial cable connections to the housing are made using conventional 5/8 × 24 threads per-inch
stinger-type connectors. Five port plugs in the cover enable access to internal test points
without opening the housing.
The interior platform assembly of the 15A MB-HSG differs from the platform assembly of the
10A MB-HSG (earlier models MB-550D-H, MB-750D-H, and MB-75SH, AH, and JH). However,
you can upgrade the 10A MB to a 15A MB using existing housings. To upgrade the MB-550D-H
or MB-750D-H, use the MB-15A kit P/N 951941-005-00. To upgrade the MB-75SH, AH, or JH,
use the MB-15AII platform assembly kit P/N 951941-007-00.
Two messenger clamps are located on the side of the housing (Figures 2-4 and 2-6) and are
secured with 5/16 inch × 24 threads-per-inch stainless steel bolts. The bottom of the housing
also contains two 5/16 × 24 threaded holes located on the horizontal center-line separated by
7.7 inches center-to-center. Use these holes and the bolts from the messenger clamps for
pedestal and surface-mounting installations.
MBV3-100* Installation and Operation Manual
Overview
2-5
Gaskets
Each housing is equipped with a recessed woven-wire RF gasket and a silicone-rubber weather
gasket to provide a seal between the housing base and lid (Figure 2-5). These gaskets provide
efficient ground continuity, RF shielding, and weather protection. Both gaskets must be in place
and in good condition to ensure proper operation and protection of the station. The weather
gasket should be lightly coated with silicone grease each time the amplifier is opened. Replace
this gasket if it becomes damaged or deformed.
Figure 2-5
Housing gaskets
MBV3-100* Installation and Operation Manual
2-6
Overview
Port Locations
Although there are five port plugs in the cover of the MBV3-100* only the input test point
enables user access (Figure 2-6). The input and output ports provide connection for coaxial
cables and are protected by factory-inserted plastic cap plugs. Discard the plastic cap plugs
when you install the cable connectors.
Figure 2-6
Housing ports
Power Supply
The lid of the amplifier houses the model MPPS-II 60/90 power pack (Figure 2-7). It provides a
regulated 24 VDC output at 2.0 amps maximum over an AC input voltage range from 38 VAC to
90 VAC rms. The input voltage wave shape is either a squarewave or a sinewave. The surge
protector and the EMI filter protect the power pack and amplifier from transient spikes. An
integral fast-acting zener diode provides additional surge protection.
The preregulator is a fixed frequency switching regulator that presents a near perfect power
factor to the input line and provides overvoltage and overcurrent protection. A precision output
regulator provides a precise output voltage and is also protected against overcurrent and short
circuits. If a short circuit is detected, the power supply shuts down and the regulator initiates a
sequence of line test pulses at approximately one-half second intervals. The regulator continues
these pulses for the duration of the short circuit but returns to normal operation when the fault
is cleared.
MBV3-100* Installation and Operation Manual
Overview
2-7
Figure 2-7 illustrates the MPPS-II installed in the lid of the MBV3-100*.
Figure 2-7
MPPS-II power pack
The MPPS-II also contains a two position LO/HI selector that sets the start-up voltage for 38 VAC
or 55 VAC. The MBV3-100* is shipped with the selector in the LO position which is the standard
configuration. The selector should be switched to the HI position only for a 90 VAC system. If
you ordered a model with the 90VAC option (Figure 2-2), the jumper is set to the HI position at
the factory. This jumper position sets the start-up voltage at 55 VAC. Because this is only 5 V
below 60 VAC, it is not practical to switch to HI in a 60 VAC system. There is no damage to the
amplifier if the selector is not changed from the standard LO setting. However, changing the
selector ensures that the DC supply does not turn on until the proper input voltage, 38 VAC or
55 VAC, is reached. This prevents excessive loading of the system power supply during turn-on
after a system shutdown.
MBV3-100* Installation and Operation Manual
2-8
Overview
Figure 2-8 illustrates the location of the LO/HI voltage selector and the FTEC surge protector on
the MPPS-II.
Figure 2-8
MBV3-100* power supply
FTEC
surge
protector
LO/HI
voltage
selector
J1
HI
LO
TP1
R54
TP2
460132-001
You must remove the MPPS-II cover to access the selector illustrated in Figure 2-8.
Section 3, “Amplifier Setup” explains changing the setting of this selector to meet system
requirements.
The power supply includes a fast-transfer electronic-crowbar (FTEC) surge protector. The FTEC
fires at approximately 245 V and presents a short circuit to the line during periods of over
voltage. After the AC input voltage returns to normal, the FTEC resumes its open state.
MBV3-100* Installation and Operation Manual
Overview
2-9
Factory installed 20-amp fuses, illustrated in Figure 2-9, provide power passing to additional
amplifiers.
Figure 2-9
Power passing fuse locations
Forward Path
The operational gain of the MBV3-100* amplifiers is 42 dB with 16 dB of return loss in the
forward path. The operating gain includes provisions for the insertion loss of the input cable
equalizer and required reserve gain to operate the Bode equalizer in the middle of its range.
The forward path’s electronics consist of two parallel three-stage paths consisting of:
(1) pre-amplifier (input hybrid), (2) intermediate amplifier (midstage hybrid), and
(3) power-doubling output hybrid stage. The first two stages are common to both paths. The
pre-amplifier stage provides a low noise figure while the output stage contributes the preferred
power at low distortion. The amplifier input provides a facility to install a cable equalizer and a
socket for a model JXP-*B attenuator. The attenuator and equalizer are customer installed
options.
Several circuits comprise the intermediate amplifier stages. A flatness control circuit enables
optimization of the frequency response. The Bode equalizer is a voltage-controlled device that
receives its input from the manual gain control, the vertical automatic drive unit (VADU-*), or
the VQAM automatic drive unit (VQADU-*).
Following the Bode board, a JXP-*B pad facility adjusts the RF level into the interstage hybrid
amplifier and the MDR/10/1G/* controls flatness and provides equalization. Because these
losses are located interstage, the noise figure is only significantly impacted by the insertion loss
of the forward cable equalizer or broadband cable simulator, and the input pad if its value is
increased from zero.
Following the interstage hybrid is a JXP-*B pad socket (or a splitter and two JXP-*B pad
sockets for dual output) leading into the power-doubling output stage.
MBV3-100* Installation and Operation Manual
2-10
Overview
Figure 2-10 illustrates the interconnection between these components in the triple-output
MBV3-100*.
Figure 2-10
MBV3-100* block diagram
Accurate −20 dB directional coupler test points are available at the input and at the output of
the amplifier. Because these test points are 75-ohm source impedance, they do not require
special test probes.
After the output amplifier, a second directional coupler provides signal to the optional VADU or
VQADU. As this signal is used only with the VADU/VQADU, you do not need to terminate this
port when the VADU or VQADU is not installed.
Do not remove the VADU pad (JXP ADU). Removing this pad effects the output test points.
MBV3-100* Installation and Operation Manual
Overview
2-11
Return Path
The circuit board of the MBV3-100* amplifier includes the return path. This equips the
MBV3-100* to pass signals in the return or upstream direction. The standard circuit board
contains all components including the diplex filters, with extended return bandwidth, for the
amplifier input and output.
Optional SRE-*-* return equalizers compensate for cable attenuation and are available in 1 dB
increments for S-split, and 2 dB increments for all other splits, from 0 dB through 12 dB.
There are JXP-*B pad facilities located at the input and output of the return path. You can use
these pad facilities as test points or signal injection points. The return output pad value is
normally selected to control the return signal level into the next upstream amplifier. Select an
appropriate return input pad to attenuate excessive input signal.
The return-input test points and the return-output test point are −20 dB directional couplers.
These test points present 75-ohm source impedance and do not require special test probes.
Ingress Control Switch
The ingress control switches (Optional ICS, illustrated in Figure 2-11) provide return-path
signal attenuation or cutoff in the MBV3-100*. Switching is accomplished through the frequency
agile LIFELINE status-monitoring module, which you can purchase directly from AM
Networks.
The ICS provides a means of isolating sources of ingress from a centralized location. Using a
downstream command through the LIFELINE status-monitoring system, you can attenuate the
return path through the amplifier by 6 dB or by 38 dB. By reducing the ingress level at the
headend or monitoring point, you can further isolate the ingress source.
After you isolate an ingress source to the last possible amplifier, node, or line extender, you can
shut the return path off at that location. This limits the impact of the ingress on the remainder
of the network while eliminating the source of ingress.
MBV3-100* Installation and Operation Manual
2-12
Overview
Options and Accessories
The factory ships the MBV3-100* as a fully functional unit, but you must configure it
appropriately for the field location requirements. You must install the correct forward equalizer
or broadband cable simulator and input pad to place the unit in service. Section 3, “Amplifier
Setup” provides information to assist you in this task. Use model JXP-*B pads to control field
signal levels. To compensate for temperature, install the VADU or VQADU before placing the
MBV3-100* in service. You can install other items such as return thermal attenuators or
ingress control switches at your discretion, but these options do not render the MBV3-100*
inoperative if they are not included.
Table 2-1 provides a comprehensive list of options and accessories for the MBV3-100*. See
Section 3, “Amplifier Setup,” or the Motorola online product catalog for additional information.
Table 2-1
MBV3-100* options and accessories
Model
Description
Function
VADU-*
Vertical Automatic Drive Unit
This board automatically controls amplifier output levels
that change with cable attenuation and hybrid output.
The selection of a pilot frequency is required.
VQADU-*
Vertical QAM Automatic Drive
Unit
This board automatically controls amplifier output levels
that change with cable attenuation and hybrid output.
The selection of a pilot frequency (QAM modulated
digital channel) is required.
SFE-100-*
Starline Forward Equalizer
This 1 GHz equalizer compensates for cable properties
in 1 dB increments from 0 dB to 22 dB. You must install
the appropriate value.
SRE-*-*
Starline Return Equalizer
This bandwidth specific equalizer compensates for
cable attenuation in 1 dB increments from 0 dB to
12 dB for S-split (2 dB increments for all other splits).
You must install the appropriate value.
SCS-*
Starline Cable Simulator
This simulator compensates for cable properties. You
must install the appropriate value.
JXP-*B
Fixed attenuator
This pad attenuates excessive input signal and can be
used to adjust amplifier gain. It is available in 1 dB
increments from 0 dB to 26 dB. You must install the
appropriate value.
JXP-TH*C
Thermal attenuators
This option compensates for gain changes with
temperature in the return path.
FTEC
Fast Transfer Electronic
Crowbar
This accessory is used for over voltage protection.
ICS-II
Ingress Control Switch
This option enables remote monitoring, isolation, and
reduction of ingress on the return path by providing
signal attenuation of 6 dB or cutoff of 38 dB typical. The
unit is shipped with a jumper in this location. To control
the ICS, you must install the LIFELINE status monitor
available from AM Networks.
JXP-RC100
High-Band Equalizer
Enables high-end correcting of plant roll-off.
JXP-RPC
Return Path Correction Board
This optional board provides additional flatness
response correction in the return path for systems that
must meet especially stringent return-path flatness
requirements.
MBV3-100* Installation and Operation Manual
Overview
2-13
Figure 2-11 illustrates the location of options and accessories in the MBV3-100*.
Figure 2-11
MBV3-100* options and accessories
20A
fuse
Forward
equalizer or
MidTP Cable simulator stage DRIVE UNIT/MAN
pad
Drive control ADU/
forward (SFE-100-*
or SCS-*)
(JXP)
select jumper QADU
output
TP
return
output
Diplex
filter
Input
pad
(JXP IN)
MDR
BODE
board
Auto
level
(ADU)
Output pad
(JXP 2)
Diplex
filter
ADU/QADU
pad
(JXP ADU)
TP
return
input
TP forward
output
(Status
monitor
output)
20A
fuse
SRE-*-**
20A
fuse
Diplex
filter
Return
output pad
(JXP)
Optional
ICS
Return
equalizer
(SRE-*-*)
Output
Return Optional
pad
input thermal pad
pad (JXP THERM) (JXP 3)
(JXP 3)
Manual
level
(MAN)
Output pad
(JXP 4)
20A
Optional Return TP
input return
fuse
ICS
input
pad
(JXP
jumpers (JXP 4)
shown)
TP Return
Diplex
Status
forward input
filter
monitor
output 4 pad
input
(JXP 2)
If you are not using a VADU/VQADU, you can select manual control of the Bode board.
Figure 2-11 illustrates the location of the DRIVE UNIT/MAN jumper on the main circuit board.
MBV3-100* Installation and Operation Manual
Section 3
Amplifier Setup
This section provides instructions on how to properly handle and configure the MBV3-100*. It
also describes the proper forward and return path alignment procedures. It is recommended
that you read this entire section before you install the MBV3-100*.
Proper Handling Procedures
The following information is useful in reducing GaAs RF amplifier failures caused by
Electrostatic Discharge (ESD) or Electrical Over Stress (EOS).
Many electronic components are vulnerable to ESD and EOS. Improper handling during service
and installation can subject the MBV3-100* to performance degradation or failure. All closed
operational units are equally protected. Compliance with proper handling procedures can
significantly reduce ESD and EOS related failures.
To avoid excessive signal level which causes EOS, follow the procedures listed below:
Field Practice
Proper field procedures include:
ƒ
Installing the system design value forward equalizer and a high value (20 dB or above)
input pad before you install or remove the electronics chassis or activate the system. This
significantly reduces RF signal level and avoids possible EOS which can damage the
hybrids.
ƒ
Leaving the input pad location open if a high value pad is not available. A more accurate
forward input test point reading is achieved with a high value pad installed.
ƒ
Avoiding handling of the hybrids. If you need to remove or install the hybrids, follow proper
ESD grounding practices as stated under Bench Setup.
Bench Setup
Proper bench handling practices include:
ƒ
Grounding of the test bench with ESD matting on the work surface and wearing a wrist
strap connected to a continuous ground monitor checker. These practices are particularly
important when handling hybrids.
ƒ
Terminating all unused ports with a 75-ohm load.
ƒ
Securing all electronics module cover screws or removing the cover completely. Loose screws
can cause the MBV3-100* to oscillate and degrade performance.
MBV3-100* Installation and Operation Manual
3-2
Amplifier Setup
To successfully setup the MBV3-100*, you need to perform the following tasks:
ƒ
Forward path alignment
ƒ
Return path alignment
ƒ
Check powering and surge protection options
Forward Path Alignment
You must perform the following MBV3-100* alignment procedures for proper performance in
the forward path:
ƒ
Select the appropriate cable equalizer or cable simulator
ƒ
Select the appropriate input, midstage, and output pads
ƒ
Verify proper flatness control
ƒ
Verify proper level control
Before You Begin
Before you begin to set-up the amplifier and perform forward-path alignment, please read the
following instructions and recommendations.
For proper forward alignment obtain:
ƒ
RF output levels and tilts of all MBV3-100*s in the forward or return path
ƒ
RF input level for the MBV3-100* being set up (from system design or as-built map)
ƒ
A carrier at the system’s highest frequency. It can be modulated or continuous wave (CW)
and should be inserted in the headend at standard video levels. This carrier is used to
simplify field set-up.
It is recommended that you:
ƒ
Install the system design value SFE-100-* and a high value (20 dB or above) input pad
(JXP IN) before you install or remove the electronics chassis or apply power to the MBV3100*.
Leave the JXP IN pad location open if a high value pad is not available. A more accurate
forward input test point reading is achieved with a high value pad installed.
ƒ
Do not remove or install the electronics chassis cover while the MBV3-100* is powered.
ƒ
If you need to remove or install the electronics chassis cover for any reason, shut off
the AC power first. Verify that all chassis cover screws are tightened to 10–12 in-lbs.
ƒ
Do not use wire jumpers to bypass the SFE-100-* location.
ƒ
Recognize that actual pad and SFE-100-* values may differ slightly from their design
values. This is caused by factors such as walkout errors, worst-case data utilization during
design and temperature variation from 70°F.
ƒ
Secure the electronics chassis in the housing base and torque to 18-22 in-lbs. to facilitate
heat transfer and avoid damage from overheating.
ƒ
Perform a bench alignment. Pre-aligning the MBV3-100* response on the bench (Section 4,
“Bench Testing”) for a system signature simplifies field alignment.
MBV3-100* Installation and Operation Manual
Amplifier Setup
3-3
ƒ
Field-sweep the entire bandwidth of the amplifier to correct frequency response for passive
signature and roll-off.
ƒ
Close the housing in accordance with the instructions in Section 5, “Installation.”
STARLINE Forward Equalizers
Select the appropriate model SFE-100-* to compensate for cable attenuation versus frequency
and to obtain the proper output tilt. The MBV3-100* is equipped with the MDR/10/1G/*
interstage equalizer and flatness board, which compensates for cable attenuation. Any cable or
passive slope beyond that of the MDR must be compensated for by selecting and installing the
appropriate SFE-100-* cable equalizer.
Equalizers are available in 1 dB increments from 0 dB through 22 dB. The following examples
describe how to choose the correct equalizer.
Example 1
The amplifier location includes 20 dB of cable (at 1 GHz) between its input and the preceding
amplifier. Consider cable loss only. Exclude any flat loss due to splitters or other passive
devices. The internal equalizer, model MDR/10/1G/*, compensates for approximately 18 dB of
cable. Subtract this cable length from the 20 dB of this example (20 − 18 = 2). The SFE-100-2 is
the proper equalizer in this case. With this equalizer installed, the amplifier reproduces the
output tilt of the last upstream amplifier.
When selecting an equalizer, choose the next lower value if the exact value is not available or in
cases where the calculated value makes two choices possible.
Example 2
The MBV3-100* is used in a link following a fiber node. The fiber receiver output is flat and
connects to the input of the amplifier through 18 dB of cable plus passive loss. Determine which
is the proper equalizer to achieve the 11 dB output tilt from the MBV3-100*.
Calculate the equalizer value using the following equation:
SLOPEeq = TILTout + SIGlo – SIGhi – SLOPEieq
where:
SLOPEeq = required SFE-100-* slope
TILTout = required amplifier output tilt
SIGlo
= signal input level at 54 MHz (channel 2)
SIGhi
= signal input level at 1 GHz
SLOPEieq = interstage equalizer slope (14 dB)
From various references, such as manufacturer’s catalogs, you can determine that 18 dB of
cable, at the operating frequency of 1003 MHz, produces approximately 4.0 dB of loss at
54 MHz. This suggests that the channel 2 signal input to the MBV3-100* is 14.0 dB greater
(18 − 4.0 = 14.0) than it is at 1003 MHz. Our example assumes that the high-end frequency level
into the MBV3-100* is +12 dBmV.
MBV3-100* Installation and Operation Manual
3-4
Amplifier Setup
Substituting this information into the above equation provides the following result:
11 dB + 26.0 dB − 12 dBmV − 14 dB = 11.0 dB
The slope of the required equalizer is 11 dB. Table 3-1 and the graph in Figure 3-1 show that
11 dB of slope is caused by approximately 14 dB of cable at 1003 MHz. Therefore, the correct
equalizer is model SFE-100-14.
When selecting an equalizer, choose the next lower value if the exact value is not available or in
cases where the calculated value makes two choices possible.
Table 3-1 helps you choose the correct equalizers and also lists insertion loss at various
frequencies.
Table 3-1
Starline Forward Equalizers — SFE-100-*
Frequency (MHz) versus Insertion Loss (dB)
Equalizer
Value
Equalizer
Slope
50
200
300
450
550
650
750
870
1003
22
17.1
18.1
13.2
11.0
8.3
6.7
5.3
4.0
2.5
1.0
20
15.5
16.5
12.1
10.1
7.6
6.2
4.9
3.7
2.4
1.0
18
14.0
15.0
11.0
9.2
6.9
5.7
4.5
3.4
2.2
1.0
16
12.4
13.4
9.9
8.2
6.3
5.2
4.1
3.2
2.1
1.0
14
10.9
11.9
8.7
7.3
5.6
4.6
3.7
2.9
2.0
1.0
12
9.3
10.3
7.6
6.4
5.0
4.1
3.3
2.6
1.8
1.0
10
7.8
8.8
6.5
5.5
4.3
3.6
2.9
2.4
1.7
1.0
8
6.2
7.2
5.4
4.6
3.6
3.1
2.6
2.1
1.5
1.0
6
4.7
5.7
4.3
3.7
3.0
2.6
2.2
1.8
1.4
1.0
4
3.1
4.1
3.2
2.8
2.3
2.0
1.8
1.5
1.3
1.0
2
1.6
2.6
2.1
1.9
1.7
1.5
1.4
1.3
1.1
1.0
SFE-100-*
MBV3-100* Installation and Operation Manual
Amplifier Setup
3-5
Figure 3-1 illustrates a graph of the equalizer slope versus equalizer value information
presented in Table 3-1. The amount of cable equals the equalizer value.
Figure 3-1
Equalizer slope versus cable
Slope versus Cable
22
20
18
dB of Cable
16
14
12
1 GHz
10
8
6
4
2
0
0
2
4
6
12
10
8
dB of Equalizer Slope
14
16
18
When selecting an equalizer, choose the next lower value if the exact value is not available or in
cases where the calculated value makes two choices possible.
Because of variations in cable attenuation, slope in passive devices, and other independent
variables, you may need to change the final value of the equalizer before you install the
MBV3-100*.
MBV3-100* Installation and Operation Manual
3-6
Amplifier Setup
STARLINE Cable Simulators
STARLINE cable simulators, model SCS-*, are used in place of fixed equalizers in systems
where: (1) the amplifiers are located close together, (2) there are large amounts of flat loss from
passive components, or (3) it is necessary to compensate for reverse cable tilt. The simulators fit
in the same location as the equalizers.
Table 3-2 and Figure 3-2 help you choose the correct simulators.
Table 3-2
STARLINE cable simulators
SCS-*
1
2
3
4
Frequency
5
6
7
8
9
10
Cable slope in dB
40 MHz
0.0
0.1
0.1
0.1
0.2
0.2
0.3
0.3
0.3
0.4
45 MHz
0.0
0.0
0.1
0.1
0.1
0.1
0.1
0.1
0.2
0.2
50 MHz
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
72 MHz
-0.1
-0.2
-0.2
-0.3
-0.4
-0.4
-0.5
-0.6
-0.7
-0.7
108 MHz
-0.1
-0.3
-0.4
-0.5
-0.6
-0.8
-0.9
-1.0
-1.2
-1.3
150 MHz
-0.2
-0.5
-0.7
-0.9
-1.2
-1.4
-1.6
-1.9
-2.1
-2.3
211 MHz
-0.3
-0.7
-1.0
-1.4
-1.7
-2.1
-2.4
-2.8
-3.1
-3.5
250 MHz
-0.4
-0.8
-1.2
-1.7
-2.1
-2.5
-2.9
-3.3
-3.7
-4.1
300 MHz
-0.5
-1.0
-1.5
-1.9
-2.4
-2.9
-3.4
-3.9
-4.4
-4.9
350 MHz
-0.6
-1.1
-1.7
-2.2
-2.8
-3.3
-3.9
-4.4
-5.0
-5.5
400 MHz
-0.6
-1.2
-1.8
-2.5
-3.1
-3.7
-4.3
-4.9
-5.5
-6.2
450 MHz
-0.7
-1.4
-2.0
-2.7
-3.4
-4.1
-4.7
-5.4
-6.1
-6.8
550 MHz
-0.8
-1.6
-2.4
-3.2
-4.0
-4.8
-5.5
-6.3
-7.1
-7.9
750 MHz
-1.0
-2.0
-3.0
-4.0
-5.0
-6.0
-7.0
-8.0
-9.0
-10.0
870 MHz
-1.1
-2.2
-3.3
-4.4
-5.5
-6.7
-7.8
-8.9
-10.0
-11.1
1003 MHz
-1.2
-2.5
-3.7
-4.9
-6.2
-7.4
-8.7
-9.9
-11.1
-12.4
50 MHz loss (typical)
-1.0
-1.0
-1.0
-1.0
-1.0
-1.0
-1.0
-1.0
-1.0
-1.0
MBV3-100* Installation and Operation Manual
Amplifier Setup
3-7
The information in Table 3-2 is shown as a graph in Figure 3-2:
Figure 3-2
Frequency versus cable slope
1
0
-1
SCS-1
-2
SCS-2
Cable slope (dB)
-3
-4
SCS-3
-5
SCS-4
-6
SCS-5
-7
SCS-6
-8
-9
SCS-7
-10
SCS-8
-11
SCS-9
-12
SCS-10
1003
870
750
550
450
400
350
300
250
211
150
108
72
50
45
40
-13
Frequency (MHz)
Input, Midstage, and Output Pads
Install model JXP-*B pads to attenuate the signal per system design drawings. Generally, this
consists of attenuating excessive input levels. You should pad the input to system level for unity
gain. Select and install the specified pad in the socket labeled JXP-IN on the amplifier cover.
You can use the midstage pad (JXP) and output pads (JXP2 and JXP3/4) to adjust the gain level
and achieve the gain specification. Refer to Section 6, “Operating Tips” for midstage/output
padding information and recommendations.
Flatness Control
All amplifiers are factory-aligned for optimal station flatness therefore, there is usually no need
to adjust the MDR board. However, you can make minor adjustments, if necessary to achieve
flatness across the passband.
The MDR/10/1G/* board includes flatness controls and a fixed cable equalizer for 1003 MHz.
This equalizer, plus the contribution of the hybrid gain stages, produces approximately the dB
of slope indicated by the model number (14 dB of tilt with an MDR/10/1G/*).
Adjust the MDR/10/1G/* board to correct peak-to-valley response variations. Figure 3-3
illustrates the location of the MDR/10/1G/* board. Adjust or replace the MDR/10/1G/* if the
response exhibits tilt.
MBV3-100* Installation and Operation Manual
3-8
Amplifier Setup
Figure 3-3
Flatness controls
You can adjust the variable resistors and capacitors on the MDR board to flatten the response
across the passband. Use C1, C2, C3, R1, R2, R4, L3, L4, L7, and L8 on the MDR board
(illustrated in Figure 3-4) to obtain a flat response.
Figure 3-4
MDR/10/1G/* board – top (left), bottom (right)
To obtain maximum flatness:
1
On the main board, adjust the variable capacitor C8 (Figure 3-5) to minimum capacitance to
place the peak out of the bandwidth.
This should not need adjusting as it is properly set during manufacturing.
2
On the MDR/10/1G/* board adjust:
a. R2, C2 for the roll-off at the lowest forward frequency caused by cut-off of the diplex
filters.
b. R1, C1 for just above the lowest forward frequency.
c. R4, C3 for the mid-frequency.
d. L3, L4, L7, and L8 for the upper end of the bandwidth.
MBV3-100* Installation and Operation Manual
Amplifier Setup
3-9
Directional Coupler Test Points
Accurate −20 dB directional-coupler test points are available at the input and at the output of
the MBV3-100*. Because these test points are 75-ohm source impedance, they do not require
special test probes.
After the output hybrid, a second directional coupler provides signal to the optional VADU or
VQADU board. This signal is used only when the VADU or VQADU board is installed. It is not
necessary to terminate this port when the VADU/VQADU is not installed.
Do not remove the VADU pad (JXP ADU). Removing this pad affects the output test points.
Bode Equalization
The Bode board, which is an electronically controlled equalizer, receives its control input from
the VADU/VQADU control boards. The response of the Bode board compensates for cable
attenuation changes due to temperature. If necessary, you can control the Bode board manually
using the potentiometer labeled MANUAL LEVEL shown in Figure 2-11.
Amplifier Level Control
Signal levels vary in a cable system primarily because cable attenuation changes with
temperature. Other components such as passives and amplifier hybrids are also affected by
temperature changes. To automatically compensate for these signal level fluctuations and
control output level, you must select the optional VADU/VQADU. The use of the VADU/VQADU
is recommended for improved output level stability.
When necessary and appropriate, you can also use manual gain control. The gain of the
MBV3-100* is then determined by the potentiometer marked MAN on the electronics chassis
cover.
Manual Gain Control
To use manual gain control:
1
Verify that the electronics chassis is installed correctly.
2
Ensure that there is continuity in the forward path by installing the design-value forward
equalizer and design value input JXP-*B attenuator.
3
Ensure that the drive control select jumper is in the MAN position.
4
Use a signal-level meter to measure the high band-edge carrier input level at the input test
point: 750 MHz = channel 116, 870 MHz = channel 136, 1003 MHz = channel 158.
This carrier should be at standard analog level, non-scrambled.
5
Verify that the input level agrees with the design specification input.
If the level is different from design, adjust accordingly. For example: the design level is
19 dBmV at the highest frequency and the design pad value is JXP-3B. If the actual
measured level is 21 dBmV, then you must change the pad to a JXP-5B.
If the actual levels are significantly different from the design levels, it is recommended that
you investigate or consult system management before proceeding.
6
Connect the signal-level meter to the output test point and tune the meter to the high-end
channel.
MBV3-100* Installation and Operation Manual
3-10
7
Amplifier Setup
Turn the manual gain reserve (MAN) control (illustrated in Figure 2-12) to maximum (fully
clockwise) and then reduce the output as noted in Table 3-3:
Table 3-3
Gain reserve versus ambient temperature
Temperature
8
Gain Reserve
Above 110°F (43°C)
3 dB
32°F (0°C) to 110°F (43°C)
4 dB
Below 32°F (0°C)
5 dB
Check the amplifier output tilt by measuring the high band- and low band-edge carriers.
ƒ
High = channel 116 (745.25 MHz), channel 136 (865.25 MHz), or channel
158 (997.25 MHz).
ƒ
Low = channel 2 (55.25 MHz) or channel 3 (61.25 MHz)
ƒ
If the tilt is less than required, install a higher value input equalizer.
ƒ
If the tilt is greater than required, install a lower value input equalizer.
ƒ
If the high value equalizer provides too much tilt and the low value equalizer provides
too little tilt, use the lower value equalizer. Under-equalization is preferred to
over-equalization.
If you set up the MBV3-100* using an SCS-*, you must increase or decrease the JXP input
pad by the amount of change you made in the SCS-* value. Therefore, to maintain a proper
gain level, it is necessary to adjust the input pad value as follows:
9
ƒ
For each increase in SCS-* value, decrease the input pad by 1 dB.
ƒ
For each decrease in SCS-* value, increase the input pad by 1 dB.
ƒ
If you replace an SFE with an SCS-*, reduce the value of the input pad by the value of
the SCS.
Measure the output level at the highest frequency.
It should be within 1 dB of the system design level. If it is not, you must adjust the midstage
pad (JXP) and/or the output pads (JXP 2 AND JXP 3/4) accordingly. Refer to Section 6,
“Operating Tips,” for midstage/output padding information and recommendations.
MBV3-100* Installation and Operation Manual
Amplifier Setup
3-11
Vertical Automatic Drive Unit/QAM Automatic Drive Unit
The VADU and VQADU operate by using surface acoustic wave (SAW) filters to select a pilot
frequency and then monitor the amplitude of this frequency. Any change in signal level is fed
back to the Bode equalizer. It is assumed that the encountered signal level changes are due to
changes in cable attenuation and hybrid output associated with a change in temperature. The
Bode equalizer then changes its insertion loss to maintain a constant output level. The VADU
(Figure 3-5) and VQADU (Figure 3-6) maintain a more precise output level than leaving the
MBV3-100* in manual control.
Figure 3-5
ADU
Figure 3-6
QADU
To set-up the VADU/VQADU:
1
Position the drive control select jumper (Figure 2-11) temporarily to the MAN position and
perform the complete procedure described in Manual Gain Control if not already completed.
2
Verify that the frequency stamped on the VADU or VQADU control unit is the same as the
system pilot frequency. For the VADU, the pilot frequency is a CW pilot or an available
NTSC television channel not scrambled using sync suppression and not a digital channel.
For the VQADU, the pilot signal is a VQAM modulated digital channel.
3
Position the drive control select jumper to DRIVE UNIT.
MBV3-100* Installation and Operation Manual
3-12
Amplifier Setup
4
Connect a signal-level meter to the FWD OUT test point and tune the meter to the high
band-edge carrier.
5
Turn the auto level (VADU) potentiometer (illustrated in Figure 2-11) fully clockwise and
then reduce to obtain the level obtained in Step 9 under Manual Gain Control.
VADU/VQADU Pads and Levels
This subsection provides information regarding the proper VADU/VQADU padding
requirements for the MBV3-100*.
A JXP-*B pad is installed in the input line to the VADU/VQADU location. This pad adjusts the
VADU/VQADU input level for the standard application of the MBV3-100* but you can change
this pad depending on the operational output of the MBV3-100*.
In the MBV3-100* analog VADU circuit, a JXP-6B pad is generally recommended. This is the
standard ADU pad value as shipped from the factory and is appropriate for an amplifier output
level range from +43 dBmV to +49 dBmV at 550 MHz. Use a JXP-0B pad for output levels below
+43 dBmV and a JXP-10B for output levels above +49 dBmV.
The standard pad for the VQADU is a JXP-0B. This pad value works for a MBV3-100* output
level from +38 dBmV to +47 dBmV at 550 MHz. Use a JXP-6B when operating above +47 dBmV
at 550 MHz.
Motorola does not recommend operating the MBV3-100* above +46 dBmV at 550 MHz.
Use of a VADU or VQADU is recommended for improved output level stability although you can
operate the MBV3-100* in the manual mode. Select manual mode by placing the drive control
select jumper, illustrated in Figure 2-11, in the MAN position. The gain of the MBV3-100* is then
determined by the potentiometer marked MAN on the amplifier cover.
Return Path Alignment
The following subsections describe the MBV3-100* alignment procedures required for proper
performance in the return path.
Before You Begin
Before you begin to set-up the amplifier and perform return-path alignment, please read the
following instructions and recommendations.
For proper return alignment obtain:
ƒ
RF alignment levels and insertion points for all MBV3-100*s
ƒ
RF reference output level of the headend optical receivers
Equipment required for return-path alignment includes:
ƒ
Full complement of JXP-*B pads and STARLINE Return Equalizers (SRE-*-*)
ƒ
Reverse signal generator — must produce at least one signal within the return bandpass
and have variable output
ƒ
Return sweep or alignment equipment
It is recommended that you:
ƒ
Do not remove or install the electronics chassis cover when the MBV3-100* is powered
MBV3-100* Installation and Operation Manual
Amplifier Setup
ƒ
Do not use wire jumpers to bypass the SRE-*-* location
ƒ
Perform the return optical link set up before performing amplifier set up
ƒ
Specify reverse alignment design levels for a single carrier
ƒ
Consider sweep equipment as a single carrier and operate at design levels
ƒ
Do not include injection point losses in reverse design levels
3-13
If JXP THERM devices (JXP-TH*C) are specified for level control, they should be installed in
the JXP THERM pad facility (illustrated in Figure 2-11).
Alignment Procedure
The return amplifier configuration includes one high-gain (30 dB) return amplifier hybrid, and
an appropriate SRE-*-* equalizer. All components are plug-in and are easily installed.
To align the return path:
1
If the MBV3-100* is powered, remove all fuses before you perform the following steps.
2
Install the design value pad in the return output pad location (JXP).
3
Install the design value return equalizer, SRE-*-*, in the RTN EQ location.
4
Verify that the return input pad locations (JXP 2 and JXP 3/4) have 0 dB pads
(or JXP-ZX jumpers) installed.
5
If you require ICSs, install them in the ICS locations illustrated in Figure 2-11. If you plan
to install the ICSs later, install JXP-2Bs to simulate the through-loss of the ICSs. This
eliminates the need to rebalance the return path if you install the ICS later.
6
Verify that the return pad (JXP COMMON) has a 0 dB pad (or JXP-ZX jumper) installed.
7
Verify that the return thermal pad socket (JXP THERM), located between the hybrid output
and the SRE-*-*, has a 0 dB pad (or JXP-ZX jumper) or JXP-TH*C installed.
8
Set the sweep equipment output level to the amplifier’s design input level. Add insertion
point loss.
9
If required, change the return output pad (JXP) and/or return equalizer to achieve, as close
as possible, a match of the reference level as compared to the node.
10 Verify the sweep response of all insertion points, if applicable.
11 Verify that the pad and equalizer values are similar to the map design values.
You can verify proper return alignment by injecting a carrier, at the design level, into any
amplifier at random. Proper alignment is achieved if you observe the reference level at the
headend optical receiver output.
Return levels used for alignment are not necessarily operational system levels. These levels
vary from system to system due to differences in equipment, architectures and design
philosophies. For an in-depth analysis and discussion of the return path, refer to Motorola
reference guide Return Path Level Selection, Setup and Alignment Procedure.
MBV3-100* Installation and Operation Manual
3-14
Amplifier Setup
Powering and Surge Protection
In conventional applications, MBV3-100*s are powered through the input port.
CAUTION!
To avoid damage to the hybrids, it is recommended that you remove the input pad (JXP-IN) before you apply power to
the MBV3-100*.
A 20-ampere, blade-type fuse is furnished in the three active ports of the dual output amplifier
module and provides overcurrent protection for AC power applied to the input. You can power
the MBV3-100* from the output without passing power through to the input port. To block
power from the input port, remove the 20-amp fuse (Fin) located in the input port as illustrated
in Figure 2-9.
WARNING!
To avoid possible injury to personnel or damage to the equipment, remove 60/90 volt AC power from the system
before you remove any components from the housing.
The MBV3-100* is shipped from the factory configured for 38 through 90 VAC powering as
described in Section 2, “Overview”. To configure the MBV3-100* for 55 VAC through 90 VAC
operation:
1
Remove the power-supply cover.
2
Move the LO/HI selector (jumper J1 on the power-supply board) from the LO to HI position.
Figure 2-8 illustrates the jumper location.
3
Re-install the power-supply cover and torque the screws to 10 to 12 in-lbs.
MBV3-100* Installation and Operation Manual
Section 4
Bench Testing
Motorola’s recommended procedure for placing a new MBV3-100* into service is to fully test it
on the bench before it is field installed. There are specific alignment procedures that ensure
proper functioning of all components and simplify final installation. If the MBV3-100* is
properly aligned on the bench, only minor adjustments may be required in the field.
The following subsections provide instructions to bench align the MBV3-100*.
Before You Begin
The MBV3-100* is shipped with a 20 ampere blade-type fuse in all ports of the amplifier module
for overcurrent protection.
CAUTION!
To avoid applying 60/90 VAC to the test equipment during testing, remove the fuse from the connected
output port (F2, F3, or F4) illustrated in Figure 2-9. Terminate all unused ports.
Open the housing and remove the electronics chassis cover. Refer to your system drawings or
records to confirm the presence of the required options as described in Section 2, “Overview,”
Options and Accessories.
Reinstall the electronics chassis cover and torque the screws to 10–12 in-lbs.
MBV3-100* Installation and Operation Manual
4-2
Bench Testing
Test Equipment and Connections
The equipment typically used for testing the MBV3-100* consists of a network analyzer, such as
the HP 8712 or 8713 series, a 60/90 VAC bench power supply, a cable simulator, a Motorola
model SSP-PIN power combiner, and a variety of jumper cables, adapters, and fittings.
Fabricate a cable simulator that you can configure to provide the desired cable loss in 1 dB
increments up to approximately 30 dB. Then, connect the test equipment as shown in
Figure 4-1.
Figure 4-1
Test equipment connections for bench sweeping
CAUTION!
To protect the network analyzer, you must configure the SSP-PIN power combiner to block AC power from the input
port.
To preserve signal quality, verify that all unused ports are terminated.
CAUTION!
Before you begin the following subsection, remove the input pad (JXP-IN) before you apply power. This is necessary to
avoid damage to the hybrids.
MBV3-100* Installation and Operation Manual
Bench Testing
4-3
Measuring Forward Gain
This subsection provides instructions for measuring the full gain and the operational gain and
flatness of the MBV3-100*.
To measure the full gain of the amplifier:
1
Determine whether the power-supply jumper (J1) is positioned for LO or HI operation.
2
Connect the MBV3-100* to the test equipment as illustrated in Figure 4-1 and apply power.
3
Verify that the DC voltage is 24 V ± 0.4 V and re-install the input pad.
4
Apply the sweep signal and adjust test equipment as needed.
5
Select manual gain by placing the drive control select jumper in the MAN position and turn
the manual level control (MAN) (Figure 2-11) fully clockwise.
6
Measure the gain at mixed forward frequency using the procedure outlined in the operator
manual provided with the test equipment in use.
To correct this number, add the insertion loss of the SSP-PIN power combiner (0.6 dB at
750 MHz, 0.7 dB at 870 MHz, or 1.1 dB at 1 GHz), the loss of the cable simulator at mixed
forward frequency, and the loss of the cable equalizer (1.0 dB), if it is installed.
Example
The test equipment indicates a measured gain of 24.0 dB with an MBV3-100* and the cable
simulator is set to 20 dB.
1.1 dB (power combiner)
+ 1.0 dB (cable equalizer)
+ 20.0 dB (cable simulator)
+ 24.0 dB (measured gain).
46.1 dB (unit gain).
The result must meet advertised specifications for the unit.
The operational gain of the MBV3-100* provides reduced gain capability. This enables the unit
to operate in the proper region of the Bode board when it is controlled by the ADU or QADU
drive units.
MBV3-100* Installation and Operation Manual
4-4
Bench Testing
To measure the operational gain and flatness of the amplifier:
1
Perform steps 1 through 6 in Measuring Forward Gain above.
2
Estimate the ambient temperature and find the required gain reserve by referring to
Table 3-3. Reduce the gain at the highest frequency by the amount given in the table.
Example:
The ambient temperature is 70°F. The table indicates that the required gain reserve is 4 dB.
Reduce the gain by 4 dB.
The operational gain is the sum of the measured gain after performing Step 2, plus all
losses, such as power combiner, cable loss, equalizer, and cable simulator.
The sweep response is essentially flat at this point. If the response exhibits tilt, the cable
equalizer must be changed. Install a higher equalizer value if the gain is greater at the low
frequencies; install the next lower equalizer value if the gain is less at the low-end
frequencies.
3
Measure the gain excursions from an average value within the bandpass.
The result is the peak-to-valley flatness. Some improvement is possible by adjusting the
flatness controls on the MDR/10/1G/* board as described in Section 3, “Amplifier Setup,”
Flatness Control. Figure 3-6 illustrates the location of these controls on the MDR/10/1G/*
board.
Testing Return Gain and Response
After configuring the return path, you can test the return bandpass to ensure compliance with
specifications. When testing the return amplifier, remember that it is a flat amplifier. Therefore,
the cable simulator must remain in the test setup and must remain set to the same cable
equivalent as in the forward sweep test. This provides an approximate indication of the
frequency response, which you can achieve in the field.
To test for return gain and response:
1
Reconnect the test equipment and switch the sweep input and sweep output leads of the
MBV3-100* under test to be opposite of the connection shown in Figure 4-1.
2
Remove the 20 A fuse (F IN) at the input port and replace the 20 A fuse (F2 or F4) at the
output port (Port 2 or Port 4) (Figure 2-9) before you apply power.
3
Re-adjust the test equipment to sweep from 4 MHz through the maximum return band
frequency plus 10 MHz (Example — 50 MHz for S-split).
The expected response is flat. Any tilt, which is due to the return equalizer, must average
out to a flat response in a cascade of amplifiers. A slope adjustment is not available in the
return bandpass.
MBV3-100* Installation and Operation Manual
Bench Testing
4
4-5
Measure the gain at the maximum return band frequency (example, 40 MHz for S-split).
The amplifier gain is the sum of: the measured gain, the insertion loss of the return cable
equalizer at the maximum return band frequency, the insertion loss of the power combiner,
any pads installed in either the input or output pad locations, plus the cable simulator loss
at the maximum return band frequency. The measured gain must meet advertised
specifications for the return amplifier.
Example
14.0 dB (measured gain)
+ 1.0 dB (equalizer insertion loss)
+ 1.1 dB (power combiner)
+ 0.0 dB (pads)
+ 4.6 dB (cable simulator at 40 MHz)
20.7 dB (unit gain)
Completing the Test Procedures
The amplifier is now approximately tailored for a specific field location. Additional adjustments
after installation are minor in nature. Re-install the fuses removed during testing.
Complete station records by recording pertinent information. Remove test-equipment
connections and close the housing following instructions provided in Section 5, “Installation,”
Closing the Housing.
MBV3-100* Installation and Operation Manual
Section 5
Installation
The field installation procedures presented in the following subsections assume that the
amplifier was previously tested and bench aligned. Cable power and RF signal must be
available on the system. Although it is preferable to have a full complement of channels
available for balancing, you can adjust the MBV3-100* adequately with a limited number of
channels.
You can install the MBV3-100* on a messenger strand (aerial) or on a pedestal. The following
subsections provide details on each application.
Aerial Installation
The housing is normally mounted horizontally below the strand with the electronics chassis
removed to avoid possible damage during installation. Connections are made using standard
pin-type connectors with a nominal center-conductor diameter of 0.067 inches. The minimum
length of the center-conductor pin is 1.35 inches and the maximum length is 1.5 inches. Longer
pins can extend past the center-conductor seizure mechanism and degrade the match.
Extremely long pins can result in a short circuit.
Figure 5-1
Center-conductor pin length
1.50” Max.
1.35” Min.
To install the unit:
1
Power down the cable before you install the housing. This avoids blown fuses, tripped circuit
breakers, and possible personal injury.
2
Mount the housing and torque the two 5/16-inch messenger clamp bolts, located on the long
sides of the housing, (illustrated in Figure 2-4) to 10 to 12 ft-lbs.
3
Form the customary expansion loops and make all cable connections according to system design.
4
Tighten the center-conductor seizure screw using a Phillips-head screw driver. An
alternative method is to use a 3/16-inch socket and a torque wrench. The recommended
torque is 12 in-lbs. maximum.
5
To avoid water ingress, ensure that you torque the aluminum connectors to the
specifications recommended by the connector manufacturer.
6
If previously removed, reinstall the electronics chassis and fasten it to the housing with the
four captive bolts. Torque to 18 to 22 in-lbs.
7
Remove the input pad (JXP-IN) to avoid damage to the hybrids.
8
Apply power to the unit and allocate a few minutes for warm up.
MBV3-100* Installation and Operation Manual
5-2
9
Installation
Check the AC voltage setting (jumper J1, Figure 2-8).
J1 position
Description
LO
The voltage must be greater than 38 VAC as read with a true rms voltmeter or 42 VAC
when using a conventional, average reading, AC voltmeter.
HI
The voltage must be greater than 55 VAC when read with a true rms voltmeter or
61 VAC when using a conventional, average reading, AC voltmeter.
10 Check the DC voltage. Verify that it is between 23.6 V and 24.4 V and reinstall the input
pad.
11 If necessary, rebalance the amplifier following the instructions in Section 3, “Amplifier
Setup.”
12 Check the tightness of the electronic chassis cover screws (10 to 12 in-lbs.) and electronics
chassis hold-down bolts (18 to 22 in-lbs.).
13
Check the condition of the RF and weather gaskets and replace them if necessary. If needed, also
apply a light coating of silicone grease.
14
Ensure that the electronic chassis handles are folded down and that the cable between the power
pack and the electronics chassis is not pinched.
15
Close the housing and use a torque wrench to sequentially and progressively tighten the housing
bolts to a final torque of 12 ft-lb in the sequence specified on the housing cover as illustrated in
Figure 5-2.
Figure 5-2
Torque sequence
MBV3-100* Installation and Operation Manual
Installation
5-3
Pedestal Installation
Pedestal installation is similar to the aerial installation with the exception of temperature and
mounting procedure. In an aerial installation, the cable and amplifier are subject to the same
temperature. In contrast, pedestal installation provides a stable temperature environment for
the buried cable while subjecting the elevated amplifier to higher temperatures. The
VADU/VQADU, if installed, functions the same as in an aerial installation and does not require
further attention. See Section 3, “Amplifier Setup,” Amplifier Level Control for additional
information.
To mount the MBV3-100* on a pedestal:
1
Remove two 5/16-inch messenger clamp bolts located on the long sides of the MBV3-100*
housing.
2
Locate the two 5/16-inch holes 7.7 inches center-to-center cast in the housing base.
3
Use the two 5/16-inch bolts to install the MBV3-100* to the pre-drilled pedestal mounting
plate and torque to 10 to 12 ft-lbs.
Grounding
For aerial or pedestal installations, the MBV3-100* housing requires a good earth ground to
function properly.
For aerial metal-strand installations, the metal strand clamp normally provides adequate
grounding. However, if additional grounding is needed, you may attach a wire from earth
ground to a 5/16 × 24 bolt that is tightly secured to one of the pedestal mounting holes on the
bottom of the housing base.
For pedestal installations, the MBV3-100* should be adequately grounded by routine mounting
to the pedestal. However, if additional grounding is needed, attach a ground wire to a 5/16 × 24
bolt and tighten it into one of the strand clamp holes (Figures 2-4 and 2-6).
MBV3-100* Installation and Operation Manual
Section 6
Operating Tips
This section describes using amplifiers in lower frequency systems and in lower gain systems.
Using Amplifiers in Lower Frequency Systems
When using the MBV3-100* in 870 MHz or 750 MHz systems, you must consider the best
method for handling the reduced bandwidth and channel-loading requirement. The following
information helps you determine the best approach.
For distribution systems designed and installed as 1 GHz systems, but carrying a reduced
channel load, there are no further concerns. You can add or remove channels at your discretion.
If the system operates with VADUs/VQADUs, the pilot channel cannot be disturbed. Reduced
channel loading improves distortion.
For lower-frequency systems, such as 870 MHz or 750 MHz, you will need to take into account
the reduced gain from 1 GHz. Due to the amplifier tilt, there will be some loss in gain from the
published operational specification at 1 GHz. For example, a 42 dB 1 GHz MB with 14 dB of
output tilt will lose approximately 1.3 dB of gain at 870 MHz, resulting in approximately
40.7 dB of gain at 870 MHz. If you need to adjust tilt, you may accommodate by changing the
forward equalizer (SFE) value. Also, to avoid any additional loss in gain, it is optimal to use the
equalizers that match the system frequency. For an 870 MHz system, the SFE-87-*s are the
best choice, even in a 1 GHz amplifier. Note also, that the equalizer cuts off at the frequency
value for which it is designed. For example, an SFE-87-* cuts off frequencies above 870 MHz.
Therefore, if you have a 1 GHz system and need the equalizer to perform to 1 GHz, you must
use an SFE-100-*.
Using Amplifiers in Lower Gain Systems
There are three pad facilities in the forward path: (1) is the pad location (JXP-1) at the input to
the amplifier, (2) is the midstage pad (JXP-2) located between the pre-amplifier and the
interstage hybrid, and (3) are the output pads (JXP-5, -6 and -12) located between the interstage
hybrid and the output hybrids.
The input pad (JXP-1) is normally changed to accommodate excessive input levels. When
operating at the same output levels, an MBV3-100* with an input pad has the same
carrier-to-noise (c/n) and distortion performance as an MBV3-100* without the input pad.
Because it only attenuates excess signal, it has no effect on the overall performance of the
MBV3-100*.
If necessary, to achieve the gain specification, you can use the midstage pad (JXP-2) or output
pads (JXP-5, -6 and -12) to reduce the gain of the MBV3-100*. However, this will affect
amplifier performance. Output padding degrades the station distortion performance while
having minimal effect on the carrier-to-noise performance. Midstage padding is the opposite and
therefore has little effect on distortions, but degrades the carrier-to-noise performance. In
general, we recommend you pad to the gain specification on the output. However, if you are
unsure about the optimal padding technique for your system, we recommend you split the
required padding evenly between the midstage and output pad(s).
It is recommended that you contact Motorola’s TSCC or your account representative for more
specific information regarding use of the midstage and output pads.
MBV3-100* Installation and Operation Manual
Appendix A
Specifications
Specifications are valid over the given bandpass and operating temperature range of −40°F to
+140°F (−40°C to +60°C). Specifications are stated worst case unless otherwise noted, and are
subject to change. Refer to the following Motorola web site or contact your account
representative for the latest specifications.
http://www.motorola.com/Business/US-EN/Business+Product+and+Services/Cable+Broadband/RF+Amplifiers
Model MBV3-100*
Specification
Forward Amplifier
Passband
52 through 1003 MHz
Gain
Full
46 dB (with SFE-100-*)
Operational
42 dB (with SFE-100-*) and slope reserves)
Flatness
52 through 1003 MHz
±0.50 dB maximum
Level control, automatic
Bode board using VADU/VQADU
Gain control
Fixed pads, JXP-∗B
Performance - reference frequency
(MHz)
1003/550/52
At typical output (dBmV)
45/44/37
Channels
79 analog/450 MHz
digital (suppressed by
6 dB)
Crossmod
–68.5 dB
CTB
–76.5 dB
CSO
–71.0 dB
Noise figure
At 52 MHz
10 dB (with SFE-1) maximum
At 1003 MHz
10 dB (with SFE-1) maximum
Interstage equalizer, MDR/10/1G/*
14 ±1 dB
Hum modulation
–60 dB
Return loss, input/output
16 dB at operational level
Test points, input/output
20 ±1.0 dB
Housing dimensions
15.4 L × 5.5 W× 9.6 D inches (39.1 × 13.97 × 24.3 cm)
Weight
15 pounds (6.8 kg)
MBV3-100* Installation and Operation Manual
A-2
Specifications
AC Current
AC Voltage
AC current (rms)
90 VAC
0.81 A
75 VAC
1.0 A
60 VAC
1.3 A
53 VAC
1.45 A
45 VAC
1.7 A
38 VAC
2.0 A
Return Amplifier
Parameter
Specification
Passband (S–split)
5 through 40 MHz
Gain, station (minimum)
17 dB
Flatness
±0.50 dB
Level control
Fixed pads, JXP-∗B, input and output
Performance
At typical output
35 dBmV, flat
Channels
6 NTSC
Crossmod
–70 dB
CTB
–80 dB
CSO
–81 dB
Noise figure
12 dB return NF
Power requirements
70 W
VADU Automatic Drive Unit
Parameter
Specification
Pilot channel
See current catalog
Adjacent channel frequency
±6 MHz
Minimum MBV3-100* output at pilot
frequency
+36 dBmV
ALC stiffness
±0.3 output change for ±3.0 dB input change
Power requirement
24 VDC, 75 mA
MBV3-100* Installation and Operation Manual
Appendix B
Torque Specifications
Torque specifications are valid for all models of the MBV3-100*.
In-lbs
Torque
Ft-lbs
N•M
1/2 inch
120-144
10-12
13.6-16.3
5/16-18
1/2 inch
144
12.0
16.3
Test point plugs
5/8-24
1/2 inch
25-40
2.1-3.3
2.8-4.5
Seizure screw
#8-32
3/16 inch or
Phillips
12
1.0
1.4
Hybrid
#6-32
Phillips
10-12
0.8-1.0
1.1-1.4
Chassis (electronics
module)
#10-32
5/16 inch
18-22
1.5-1.8
2.0-2.4
Chassis (electronics
module) cover
#6-32
1/4 inch or
Phillips
10-12
0.8-1.0
1.1-1.4
Status monitor
#10-32
5/16 inch
24-30
2.0-2.5
2.7-3.4
Power supply cover
#6-32
1/4 inch or
Phillips
10-12
0.8-1.0
1.1-1.4
Fastener
Screw Size
Wrench Size
Strand clamp/pedestal
mounting
5/16-18
Housing/lid closure
MBV3-100* Installation and Operation Manual
Abbreviations and Acronyms
The abbreviations and acronyms list contains the full spelling of the short forms used in this
manual.
VADU
Vertical Automatic Drive Unit
c/n
carrier-to-noise
CSO
Composite Second Order
CTB
Composite Triple Beat
cw
Continuous wave
dB
Decibel
dBmV
Decibels referenced to one millivolt
E–GaAs
Enhanced Gallium Arsenide
EOS
Electrical over stress
ESD
Electrostatic discharge
FTEC
Fast Transfer Electronic Crowbar
GHz
Gigahertz
ICS
Ingress Control Switch
MHz
Megahertz
NTSC
National Television Standards Committee
VQADU
Vertical Quadriture Amplitude Modulated (QAM) Automatic Drive Unit
rms
root-mean-square
RSA
Return for Service Authorization
SAW
Surface Acoustic Wave
SCS-*
STARLINE Cable Simulator
SFE-*-*
STARLINE Forward Equalizer
SRE-*-*
STARLINE Return Equalizer
TSCC
Technical Support Call Center
MBV3-100* Installation and Operation Manual
Visit our website at:
www.motorola.com
556522-001-a
3/09