Ross ADA-7801 User manual

Ross Video Limited
ADA-7801
ADA-7801-600
Audio
Distribution Amplifier
User Manual
Ross Part Number: 7801D-004
Issue: 08

ADA-7801/-600 •Audio Distribution Amplifier User Manual
• Ross Part Number: 7801D-004
• Document Issue: 08
• Printing Date: January 15, 2004. Printed in Canada.
• Software Issue: N/A
The information contained in this User Manual is subject to change without notice or obligation.
Copyright
© 2004 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 to Service Personnel
Please review the following material to avoid injury to personnel and to prevent product damage.
• All product servicing should be carried out by qualified service personnel.
• This product may require specific equipment, and/or installation procedures to be
carried out to satisfy certain regulatory compliance requirements. The following
notices have been included in the manual, to call attention to these specific
requirements.
Symbol Meanings
•Protective Earth — Protective Earth (PE) terminal. Provided
for connection of the protective earth (green or green/yellow)
supply system conductor.
•Caution — This CAUTION symbol on the equipment refers you
to the Product Manual for additional information. This symbol
appears next to required information in the manual.
•WARNING PERSONAL INJURY: Risk of electrical shock.
This symbol warns you of a potential shock hazard where
HAZARDOUS LIVE voltages greater than 30 Vrms, 42.4Vpeak,
or 60Vdc may be accessible. Failure to comply with these
instructions could result in death or serious injury.
Important Safety Instructions
•Do not use this apparatus near water. Hazardous voltages can occur.
• Clean only with a dry cloth.
• Do not block any ventilation openings. Install in accordance with the
manufacturer’s instructions.
• Do not install near any heat sources such as radiators, heat registers, stoves, or other
devices (including amplifiers) that produce heat.
• Do not defeat the safety purposes of the polarized or grounding-type plug. A
polarized plug has two blades with one wider than the other. A grounding-type plug
has two blades and a third grounding prong. The wide blade or the third prong is
provided for your safety. If the provided plug does not fit into your outlet, consult
an electrician for replacement of the obsolete outlet.
• Protect the power cord from being walked on or pinched particularly at plugs,
convenience receptacles, and the point where they exit from the device.
• Only use attachments/accessories specified by the manufacturer.
• Unplug this apparatus during lightning storms or when not in use for long periods of
time.
• Refer all servicing to qualified service personnel. Servicing is required when the
device has been damaged in any way, such as: power-supply cord or plug is
damaged, objects have fallen into the device, the device has been exposed to rain or
moisture, the device does not operate normally or has been dropped.

EMC Notices
•FCC
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. Changes or
modifications to this equipment not expressly approved by Ross Video Ltd. could void
the user’s authority to operate this equipment.
•CE
This product has been tested and meets the requirements of the European CE marking
directive. A copy of the CE Declaration of Conformity can be provided upon request.
Maintenance/User Serviceable Parts
Routine maintenance to this RossGear or GearLite 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.

Contents
Introduction 1-1
In This Chapter .......................................................................................................................1-1
A Word of Thanks....................................................................................................1-1
Overview ..................................................................................................................1-1
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
Gain Jumper Setup ...................................................................................................2-2
Board Installation .....................................................................................................2-2
Gain Potentiometer Setup.........................................................................................2-2
Specifications 3-1
In This Chapter .......................................................................................................................3-1
ADA-7801 Technical Specifications........................................................................3-1
ADA-7801-600 Technical Specifications ................................................................3-2
Service Information 4-1
In This Chapter .......................................................................................................................4-1
Troubleshooting Checklist .......................................................................................4-1
Warranty and Repair Policy .....................................................................................4-2
Ordering Information 5-1
In This Chapter .......................................................................................................................5-1
ADA-7801 Family of Audio Cards and Related Products .......................................5-1
ADA-7801 User Manual (Iss. 08) Contents •i

ii •Contents ADA-7801 User Manual (Iss. 08)

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 ADA-7801 or ADA-7801-600 Audio Distribution
Amplifiers. The ADA-7801 distribution 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 ADA-7801 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 ADA-7801, 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.
Overview
The Ross ADA-7801 Audio Distribution Amplifier provides a means of amplifying and distributing
program-level audio with virtually no loss of quality. It uses the latest types of integrated circuits,
developed specifically for professional audio applications, assuring a very low level of distortion and
noise. The amplifier is operated as an eight-output mono amplifier.
ADA-7801 User Manual (Iss. 08) Introduction •1-1

The ADA-7801 card is available in two models:
• ADA-7801, a 66Ωamplifier card for use in AFR-7800 series audio frames.
• ADA-7801-600, a 600Ωamplifier card for use in AFR-7800 series audio frames.
See Chapter 3, “Specifications” for each model’s performance details.
Please refer to the specific frame User Manual for ventilation and cooling instructions to maintain
optimum operating conditions. The ADA-7801 and ADA-7801-600 cards also fit into Leitch* FR-880
series frames to provide you with additional installation versatility.
The ADA-7801 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
Figure 1. Simplified Block Diagram of the ADA-7801
* Leitch is a trademark of Leitch Technology Corporation
1-2 •Introduction ADA-7801 User Manual (Iss. 08)

Features
The following features make the ADA-7801 and ADA-7801-600 Audio Distribution Amplifiers the
most flexible, high-quality card for your audio distribution requirements:
Features
• 8 mono outputs
• Extremely flat frequency response
• Very low distortion
• Excellent common-mode rejection
• Low noise
• Wide gain range
• Low power consumption for cool reliable operation
• 5 year transferable warranty
• Fits Ross AFR-7812C and AFR-7814C audio frames
• Fits Leitch 880 Series frames
• Interchangeable alternative to the Leitch ADA-881 amplifier
Documentation Terms
The following terms are used throughout this guide:
• “Frame” refers to the AFR-7812C or AFR-7814C frames that can house the ADA-
7801 and ADA-7801-600 cards. See the respective User Manuals for details.
• “Operator” and “User” both refer to the person who uses the ADA-7801 cards.
• “Board”, “Card”, and “Module” all refer to the ADA-7801 cards, including all
components.
• “System” and “Audio system” refers to the mix of interconnected analog production
and terminal equipment in which the ADA-7801 cards operate.
ADA-7801 User Manual (Iss. 08) Introduction •1-3

1-4 •Introduction ADA-7801 User Manual (Iss. 08)