Ross RSA-7806 User manual

Ross Video Limited
RSA-7806
Remote Gain
Stereo Amplifier
User Manual
Covers the following models:
RSA-7806 Remote Gain Stereo Amplifier
RSA-7806-150 Remote Gain Stereo 150Ω Amplifier
RSA-7806-600 Remote Gain Stereo 600Ω Amplifier
Ross Part Number: 7806D-004
Issue: 02

RSA-7806 •Audio Distribution Amplifier User Manual
• Ross Part Number: 7806D-004
• Document Issue: 02
• Printing Date: December 12, 2005. Printed in Canada.
• Software Issue: N/A
The information contained in this User Manual is subject to change without notice or obligation.
Copyright
© 2005 Ross Video Limited. All rights reserved.
Contents of this publication may not be reproduced in any form without the written permission of Ross
Video Limited. Reproduction or reverse engineering of copyrighted software is prohibited.
Notice
The material in this manual is furnished for informational use only. It is subject to change without
notice and should not be construed as a commitment by Ross Video Limited. Ross Video Limited
assumes no responsibility or liability for errors or inaccuracies that may appear in this manual.
Trademarks
•is a registered trademark of Ross Video Limited.
•Ross, ROSS, ROSS, and MLE are registered trademarks of Ross Video Limited.
•All other product names and any registered and unregistered trademarks mentioned in
this manual are used for identification purposes only and remain the exclusive property
of their respective owners.

Important Regulatory and Safety Notices
Before using this product and any associated equipment, refer to the “Important Safety Instructions”
listed below so as to avoid personnel injury and to prevent product damage.
Products may require specific equipment, and /or installation procedures be carried out to satisfy
certain regulatory compliance requirements. Notices have been included in this publication to call
attention to these Specific requirements.
Symbol Meanings
This symbol on the equipment refers you to important operating and maintenance
(servicing) instructions within the Product Manual Documentation. Failure to heed
this information may present a major risk of damage or injury to persons or
equipment.
Warning
The symbol with the word “Warning” within the equipment manual indicates a
potentially hazardous situation, which if not avoided, could result in death or serious
injury.
Caution
The symbol with the word “Caution” within the equipment manual indicates a
potentially hazardous situation, which if not avoided, may result in minor or
moderate injury. It may also be used to alert against unsafe practices.
Notice
The symbol with the word “Notice” within the equipment manual indicates a
situation, which if not avoided, may result in major or minor equipment damage or a
situation which could place the equipment in a non-compliant operating state.
ESD
Susceptibility
This symbol is used to alert the user that an electrical or electronic device or
assembly is susceptible to damage from an ESD event.
Important Safety Instructions
Caution
This product is intended to be a component product of the RossGear 8000 series
frame. Refer to the RossGear 8000 series frame User Manual for important safety
instructions regarding the proper installation and safe operation of the frame as well
as it’s component products.
Warning
Certain parts of this equipment namely the power supply area still present a safety
hazard, with the power switch in the OFF position. To avoid electrical shock,
disconnect all A/C power cords from the chassis' rear appliance connectors before
ervicing this area.s
Warning
Service barriers within this product are intended to protect the operator and service
personnel from hazardous voltages. For continued safety, replace all barriers after
any servicing.
This product contains safety critical parts, which if incorrectly replaced may present
a risk of fire or electrical shock. Components contained within the product’s power
supplies and power supply area, are not intended to be customer serviced and should
be returned to the factory for repair.
To reduce the risk of fire, replacement fuses must be the same type and rating.
Only use attachments/accessories specified by the manufacturer.

EMC Notices
US FCC Part 15
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 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
users will be required to correct the interference at their own expense.
Notice
Changes or modifications to this equipment not expressly approved by Ross Video
Ltd. could void the user’s authority to operate this equipment.
CANADA
This Class “A” digital apparatus complies with Canadian ICES-003.
Cet appareil numerique de classe “A” est conforme à la norme NMB-003 du Canada.
EUROPE
This equipment is in compliance with the essential requirements and other relevant provisions of CE
Directive 93/68/EEC.
INTERNATIONAL
This equipment has been tested to CISPR 22:1997 along with amendments A1:2000 and A2:2002 and
found to comply with the limits for a Class A Digital device.
Notice
This is a Class A product. In domestic environments this product may cause radio
interference in which case the user may have to take adequate measures.
Maintenance/User Serviceable Parts
Routine maintenance to this RossGear product is not required. This product contains no user
serviceable parts. If the module does not appear to be working properly, please contact Technical
Support using the numbers listed under the “Contact Us” section on the last page of this manual. All
RossGear products are covered by a generous 5-year warranty and will be repaired without charge for
materials or labor within this period. See the “Warranty and Repair Policy” section in this manual for
details.

Environmental Information
The equipment that you purchased required the extraction and use of natural resources for its
production. It may contain hazardous substances that could impact health and the environment.
To avoid the potential release of those substances into the environment and to diminish the need for
the extraction of natural resources, Ross Video encourages you to use the appropriate take-back
systems. These systems will reuse or recycle most of the materials from your end-of-life equipment in
an environmentally friendly and health conscious manner.
The crossed-out wheeled bin symbol invites you to use these systems.
If you need more information on the collection, reuse, and recycling systems, please contact your local
or regional waste administration.
You can also contact Ross Video for more information on the environmental performances of our
products.

Contents
Introduction 1-1
In This Chapter .......................................................................................................................1-1
A Word of Thanks....................................................................................................1-1
Overview ..................................................................................................................1-2
Functional Block Diagram .......................................................................................1-2
Features ....................................................................................................................1-3
Documentation Terms ..............................................................................................1-3
Installation and Setup 2-1
In This Chapter .......................................................................................................................2-1
Static Discharge........................................................................................................2-1
Unpacking ................................................................................................................2-1
Configuration ...........................................................................................................2-2
Operating Mode........................................................................................................2-3
Gain Control Range..................................................................................................2-3
Remote or Local Control..........................................................................................2-3
Board Installation .....................................................................................................2-3
Remote Gain Control Connection ............................................................................2-4
Cable Connections....................................................................................................2-5
ARP-7805 Installation 3-1
In This Chapter .......................................................................................................................3-1
Static Discharge........................................................................................................3-1
Unpacking ................................................................................................................3-1
Overview ..................................................................................................................3-2
Installation................................................................................................................3-2
Cable Connections....................................................................................................3-3
Specifications 4-1
In This Chapter .......................................................................................................................4-1
RSA-7806 Technical Specifications.........................................................................4-2
Service Information 5-1
In This Chapter .......................................................................................................................5-1
Troubleshooting Checklist .......................................................................................5-1
Warranty and Repair Policy .....................................................................................5-2
Ordering Information 6-1
In This Chapter .......................................................................................................................6-1
RSA-7806 Family of Audio Cards and Related Products ........................................6-1
RSA-7806 User Manual (Iss. 02) Contents •i

ii •Contents RSA-7806 User Manual (Iss. 02)

Introduction
In This Chapter
This chapter contains the following information sections:
• A Word of Thanks
• Overview
• Functional Block Diagram
• Features
• Documentation Terms
A Word of Thanks
Congratulations on choosing the Ross Video RSA-7806 Remote Gain Stereo Amplifiers. The RSA-
7806 amplifier is part of a full line of RossGear Terminal Equipment, backed by Ross Video’s
experience in engineering and design expertise since 1974.
You will be pleased at how easily your new RSA-7806 fits into your overall working environment.
Equally pleasing is the product quality, reliability and functionality. Thank you for joining the group
of worldwide satisfied Ross Video customers!
Should you have a question pertaining to the installation or operation of your RSA-7806, please
contact us at the numbers listed in the back of this publication. Our technical support staff is always
available for consultation, training, or service.
RSA-7806 User Manual (Iss. 02) Introduction •1-1

Overview
The Ross RSA-7806 Remote Gain Stereo Amplifier is a dual channel audio distribution amplifier
intended for installations where remote control of gain is required. The RSA-7806 provides a means of
amplifying and distributing program-level audio with virtually no loss of quality.
The RSA-7806 card is available in three models:
• RSA-7806, a 66Ωamplifier card typically used in high impedance applications.
• RSA-7806-150, a 150Ω amplifier card for those who require 150Ω back
termination.
• RSA-7806-600, a 600Ωamplifier card for those who require 600Ωback
termination.
The RSA-7806 card is housed in a RossGear AFR-7800 series audio frames.
See Chapter 3, “Specifications” for performance details.
Please refer to the specific frame User Manual for ventilation and cooling instructions to maintain
optimum operating conditions.
The RSA-7806 amplifiers are part of a full line of RossGear analog distribution products engineered to
satisfy the highest quality broadcast standards and the most demanding requirements of your facility.
Functional Block Diagram
1-2 •Introduction RSA-7806 User Manual (Iss. 02)

Figure 1. Block Diagram of the RSA-7806
Features
The following features make the RSA-7806 Remote Gain Stereo Amplifier the most flexible, high-
quality card for your audio distribution requirements:
• Local or Remote gain adjustment
• Stereo, mono, or summing operation
• ±20 dB and +30/-65 dB gain ranges
• Extremely flat response
• 3 Outputs per channel
• Excellent command-mode rejection
• Very low distortion
• Output test points
• 66, 150, and 600Ωversions available
• Fits Ross 7800 Series and Leitch*880 Series frames
• An improved alternative to the Leitch ARG-880
• 5 year transferable warranty
Documentation Terms
The following terms are used throughout this guide:
• “RSA-7806” also refers to the RSA-7806-150 and the RSA-7806-600 unless
otherwise noted.
• “Frame” refers to the AFR-7812C and the AFR-7814C frames that can house the
RSA-7806 cards. See the respective User Manuals for details.
• “Operator” and “User” both refer to the person who uses the RSA-7806 cards.
• “Board”, “Card”, and “Module” all refer to the RSA-7806 modules, including all
components.
• “System” and “Audio system” refers to the mix of interconnected production and
terminal equipment in which the RSA-7806 cards operate.
*Leitch is a trademark of Leitch Technology Corporation
RSA-7806 User Manual (Iss. 02) Introduction •1-3

1-4 •Introduction RSA-7806 User Manual (Iss. 02)

Installation and Setup
In This Chapter
This chapter contains the following information sections:
• Static Discharge
• Unpacking
• Configuration
• Operating Mode
• Gain Control Range
• Remote or Local Control
• Board Installation
• Remote Gain Control Connection
• Cable Connections
Static Discharge
Whenever handling the RSA-7806 cards and other related equipment, please observe all static
discharge precautions as described in the following note:
ESD
Susceptibility
Static discharge can cause serious damage to sensitive
semiconductor devices. Avoid handling circuit boards in high
static environments such as carpeted areas, and when wearing
synthetic fiber clothing. Always exercise proper grounding
precautions when working on circuit boards and related
equipment.
Unpacking
Unpack each RSA-7806 card you received from the shipping container, and check the contents against
the packing list to ensure that all items are included. If any items are missing or damaged, contact
your sales representative or Ross Video directly.
RSA-7806 User Manual (Iss. 02) Installation and Setup •2-1

Configuration
The RSA-7806 can be jumper-configured to suit several situations such as:
• Stereo amplifier — 3 outputs each, 2 remote gain controls
• Mono amplifier — 6 outputs, 1 remote gain control
• Audio mixer — 2 inputs, 6 outputs, 2 remote gain controls
• Mono amplifier — 3 outputs plus 3 mixer outputs, 2 remote gain controls
In all cases, local controls may be selected. Two mono amplifiers may be used to provide 3 pairs of
stereo outputs.
The companion remote panel, ARP-7805, provides controls for up to 12 channels from a distance of
up to 400 meters. Alternatively, any 10KΩ potentiometer may be used to provide remote control.
Installation of the RSA-7806 consists of setting up jumpers to suit the needs of the system as well as
optionally connecting the external gain control panel.
Use Figure 2, the card labeling, and the following discussions to set up the RSA-7806 jumpers.
JP1
A Channel
Control
JP6
B Channel
Control
JP3
A Channel
Control Range
JP4
B Channel
Control Range
JP5
B Channel
Operating Mode
JP2
A Channel
Operating Mode
Figure 2. RSA-7806 User Control Locations
2-2 •Installation and Setup RSA-7806 User Manual (Iss. 02)

Operating Mode
The mode of operation is set by jumpers JP2 and JP5 to the desired gain range position as shown in
the following table:
Table 1. Jumper settings
JP2 (A OUT) JP5 (B OUT)
MODE
A+B A A OUT B
Normal Mode – 2 channel stereo (default setting) 33
Mono Mode – 1 input, 6 outputs 33
Audio Mixer – 2 inputs, 6 outputs 33
3 Output Mixer + 3 B Channel outputs 33
Gain Control Range
The Gain Control Range is set by jumpers JP3 (A Channel) and JP4 (B Channel) as follows:
• Normal — provides ± 20dB gain range (default setting)
• Wide — provides +30/-65dB gain range
Remote or Local Control
Set Jumpers JP1 (A Control) and JP6 (B Control) to select Local Control (card edge) or Remote Gain
Control for the card as follows:
• Local — the gain is set via card edge controls RV1 and RV4 (default setting)
• Remote — the gain is set via remote potentiometer (RV1 and RV4 will have no
effect)
Board Installation
Use the following steps to install the RSA-7806 cards in a RossGear audio distribution frame:
1. Refer to the User Manual of the RossGear frame, to ensure that the frame is properly
installed according to instructions. If this module is to be installed in any compatible
frame other than a Ross Video product, refer to the frame manufacturer’s manual for
specific instructions.
2. Please note that heat and power distribution requirements within a frame may dictate
specific slot placement of cards. Cards with many heat-producing components
should be arranged to avoid areas of excess heat build-up, particularly in frames
using convectional cooling.
3. After selecting the desired frame installation slot, hold the RSA-7806 card by the
edges and carefully align the card edges with the slots in the frame. Then fully insert
the card into the frame until the rear connection plug is properly seated.
RSA-7806 User Manual (Iss. 02) Installation and Setup •2-3

Remote Gain Control Connection
The RSA-7806 may have its gain controlled from a remote position (up to 400m away from the RSA-
7806). The gain control can be via the optional ARP-7805 Audio Remote Gain Panel, or by customer
supplied 10kΩpotentiometers.
Depending on configuration of the RSA-7806, one or two potentiometers may be required per card.
Use the following steps and Figures 3 and 4 to connect the Remote Gain potentiometers:
1. Connect the A Channel remote gain via the OUT A4 connector on the rear of the
frame.
2. Connect the B Channel remote gain via the OUT B4 connector on the rear of the
frame.
Figure 3. Connection of the Remote Gain Potentiometers
Figure 4. Removable Connector Plug
2-4 •Installation and Setup RSA-7806 User Manual (Iss. 02)

Cable Connections
This section provides instructions for connecting cables to the RSA-7806 when mounted in RossGear
frames.
Use the Stereo markings on the rear of the frame to make the connections for the RSA-7806. See
Figure 5 and the tables below, for cable input and output designations.
Figure 5. RSA-7806/A Cabling Designations for RossGear 7814C and 7812C Series Frames
Normal Mode – 2 Channel Stereo
Use the following table to connect the RSA-7806 to enable Normal Mode with 2 Channel Stereo.
Table 2. Normal Mode – 2 Channel Stereo
Normal Mode – 2 Channel Stereo
RSA-7806 Function Frame Marking RSA-7806 Function
A IN A IN B IN B IN
A OUT1 A OUT1 B OUT1 B OUT1
A OUT2 A OUT2 B OUT2 B OUT2
A OUT3 A OUT3 B OUT3 B OUT3
A Remote Gain A OUT4 B OUT4 B Remote Gain
RSA-7806 User Manual (Iss. 02) Installation and Setup •2-5

Mono Amplifier Mode
Use the following table to connect the RSA-7806 to enable Mono Mode with 1 input and 6 outputs.
Table 3. Mono Mode – 1 Input, 6 Outputs
Mono Mode – 1 Input, 6 Outputs
RSA-7806 Function Frame Marking RSA-7806 Function
A IN A IN B IN N/C
A OUT1 A OUT1 B OUT1 A OUT4
A OUT2 A OUT2 B OUT2 A OUT5
A OUT3 A OUT3 B OUT3 A OUT6
A Remote Gain A OUT4 B OUT4 N/C
Audio Mixer Mode
Use the following table to connect the RSA-7806 to enable Audio Mixer Mode with 2 inputs and 6
outputs.
Table 4. Audio Mixer – 6 Outputs
Audio Mixer Mode – 2 Inputs, 6 Outputs
RSA-7806 Function Frame Marking RSA-7806 Function
A IN A IN B IN B IN
MIX OUT1 A OUT1 B OUT1 MIX OUT4
MIX OUT2 A OUT2 B OUT2 MIX OUT5
MIX OUT3 A OUT3 B OUT3 MIX OUT6
A Remote Gain A OUT4 B OUT4 B Remote Gain
3-Output Mixer Mode
Use the following table to connect the RSA-7806 to enable 3-Output Mixer Mode with three B
Channel outputs.
Table 5. 3-Output Mixer with 3 B Channel Outputs
3-Output Mixer Mode – 3 B Channel Outputs
RSA-7806 Function Frame Marking RSA-7806 Function
A IN A IN B IN B IN
MIX OUT1 A OUT1 B OUT1 B OUT1
MIX OUT2 A OUT2 B OUT2 B OUT2
MIX OUT3 A OUT3 B OUT3 B OUT3
A Remote Gain A OUT4 B OUT4 B Remote Gain
2-6 •Installation and Setup RSA-7806 User Manual (Iss. 02)

Connector Wiring for Inputs and Outputs
On the rear of the Ross frame there are removable connectors for two inputs and eight outputs. Unused
outputs do not need to be terminated. See Figure 6 below and the manual for the frame in which you
have installed the RSA-7806 for further details on cable connections.
Each connector has sockets for the positive, negative, and grounded wires of a balanced analog audio
cable. Wire the external cables to the removable terminal block connectors as outlined in the figures
and procedure below.
Figure 6. Connector Wiring for RSA-7806 Inputs and Outputs
Use the following steps to wire the external cables to the removable terminal block connectors:
1. Insert a wire into the designated polarity slot on the connector.
2. Use a tweaker screwdriver to tighten the corresponding screw on the underside of
the connector.
3. Repeat steps 1 and 2 for each wire on each connector.
4. Secure the cable to the connector with a tie wrap.
5. Once the cables have been wired to the connectors, install the connectors to the
sockets on the RossGear frame so that the slotted tongue fits in the grooves on the
frame’s mating connector.
RSA-7806 User Manual (Iss. 02) Installation and Setup •2-7

2-8 •Installation and Setup RSA-7806 User Manual (Iss. 02)