Ross ADA-7802 User manual

Ross Video Limited
ADA-7802
ADA-7802-600
ADA-7802V
Stereo/Mono Audio
Distribution Amplifier
User Manual
Ross Part Number: 7802D-004
Issue: 09A

ADA-7802/-600/V •Stereo/Mono Audio Distribution Amplifier User Manual
• Ross Part Number: 7802D-004
• Document Issue: 09A
• Printed in Canada.
The information contained in this User Manual is subject to change without notice or obligation.
Copyright
© 2006 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 — This symbol alerts the user of the need to
have a protective grounding source to avoid damage to electronic
components.
•Caution — This symbol alerts the user to a procedure which may
cause irreversible problems. Refer to important safety and
compliance information.
•Warning Hazardous Voltages — This symbol alerts the user
to the presence of an insulated dangerous voltage within the
enclosure of the product.
Important Safety Instructions
•Do not use this device 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.
•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.
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 ..................................................................................................................1-1
Functional Block Diagram .......................................................................................1-2
Features ....................................................................................................................1-3
Documentation Terms ..............................................................................................1-4
Installation and Setup 2-1
In This Chapter .......................................................................................................................2-1
Static Discharge........................................................................................................2-1
Unpacking ................................................................................................................2-1
Jumper Setup ............................................................................................................2-2
Board Installation .....................................................................................................2-3
Potentiometer Setup .................................................................................................2-3
Cable Connections....................................................................................................2-3
Specifications 3-1
In This Chapter .......................................................................................................................3-1
ADA-7802 Technical Specifications........................................................................3-1
ADA-7802-600 Technical Specifications ................................................................3-2
ADA-7802V Technical Specifications.....................................................................3-3
Ordering Information 4-1
In This Chapter .......................................................................................................................4-1
ADA-7802 Family of Audio Cards and Related Products .......................................4-1
Troubleshooting Checklist .......................................................................................4-2
Warranty and Repair Policy .....................................................................................4-3
ADA-7802 User Manual (Iss. 09A) Contents •i

ii •Contents ADA-7802 User Manual (Iss. 09A)

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 from the Ross Video ADA-7802 family of Audio Distribution
Amplifiers. The ADA-7802 distribution amplifiers are 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-7802 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-7802, 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-7802 family of Audio Distribution Amplifiers provides a means of amplifying and
distributing program-level stereo or mono 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 circuit board contains two identical amplifiers which can be used
for stereo distribution or as two independent four-output mono amplifiers. A jumper plug enables the
amplifiers to be operated as a single eight-output mono amplifier.
ADA-7802 User Manual (Iss. 09A) Introduction •1-1

The ADA-7802 card is available in three models:
• ADA-7802, a 66Ωamplifier card for use in AFR-7800 series audio frames.
• ADA-7802-600, a 600Ωamplifier card for use in AFR-7800 series audio frames.
• ADA-7802V, a 66Ωamplifier card for use in AVFR-7850 series audio/video frames
only.
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-7802 and ADA-7802-600 cards also fit into Leitch* FR-880
series frames to provide you with additional installation versatility.
The ADA-7802 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-7802
* Leitch is a trademark of Leitch Technology Corporation
1-2 •Introduction ADA-7802 User Manual (Iss. 09A)

Features
The following features make the ADA-7802 family of Audio Distribution Amplifiers the most
flexible, high-quality card for your audio distribution requirements:
Common Features
Each amplifier version has the following common features:
• Dual amplifiers, each with 4 outputs
• Stereo or Mono modes jumper-selectable
• Extremely flat response
• Very low distortion
• Excellent common-mode rejection
• Low noise
• Output test points
• Wide gain range
• Low power consumption for cool reliable operation
• 5 year transferable warranty
ADA-7802
This amplifier version has the following unique features:
• Fits Ross AFR-7812C and AFR-7814C audio frames
• Fits Leitch 880 Series frames
• Interchangeable alternative to the Leitch ASD-880 and ADA-883 amplifier
ADA-7802-600
This amplifier version has the following unique features:
• Fits Ross AFR-7812C and AFR-7814C audio frames
• Fits Leitch 880 Series frames
• Interchangeable alternative to the Leitch ASD-880 and ADA-883 amplifier
ADA-7802V
This amplifier version has the following unique features:
• Fits Ross AVFR-7854C and AVFR-7855C audio/video frames only
Caution
The ADA-7802 and ADA-7802-600 cards can only operate in
RossGear AFR-7812C, AFR-7814C, or Leitch 880 Series
frames. Verify correct card and frame installation.
The ADA-7802V card can only operate in RossGear AVFR-
7854C and AVFR-7855C frames. Verify correct card and
frame installation.
ADA-7802 User Manual (Iss. 09A) Introduction •1-3

Documentation Terms
The following terms are used throughout this guide:
• “Frame” refers to:
o the AFR-7812C,AFR-7814C,frames that can house the ADA-7802 and
ADA-7802-600 cards. See the respective User Manuals for details.
o the AVFR-7854C,and AVFR-7855C frames that can house the ADA-
7802V card. See the respective User Manuals for details.
• “Operator” and “User” both refer to the person who uses the ADA-7802 cards.
• “Board”, “Card”, and “Module” all refer to the ADA-7802 cards, including all
components.
• “System” and “Audio system” refers to the mix of interconnected analog production
and terminal equipment in which the ADA-7802 cards operate.
1-4 •Introduction ADA-7802 User Manual (Iss. 09A)

Installation and Setup
In This Chapter
This chapter contains the following information sections:
• Static Discharge
• Unpacking
• Jumper Setup
• Board Installation
• Potentiometer Setup
• Cable Connections
Static Discharge
Whenever handling the ADA-7802 cards and other related equipment, please observe all static
discharge precautions as described in the following note:
Caution
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 ADA-7802 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.
ADA-7802 User Manual (Iss. 09A) Installation and Setup •2-1

Jumper Setup
Use the following figure and steps to set up the ADA-7802 jumpers.
JP1
JP3
RV1
RV3
JP2
Figure 2. ADA-7802 User Control Locations
1. Set Jumper JP2 to make the card’s output stereo or mono:
• Set the jumper to the MONO position to enable mono output (controlled
with channel A Gain jumpers and potentiometer settings)
• Set the jumper to the STEREO position to enable stereo output (default
setting, controlled with channel A and B Gain jumpers and potentiometer
settings)
2. Set the A Gain jumper to the desired gain range position as shown in the following
table:
Table 1. A Gain Jumper settings
A Gain Jumper Settings
+28 dB
+18 dB
+9 dB
0 dB
3. Set the B Gain jumper to the desired gain range position as shown in the following
table:
Table 2. B Gain Jumper settings
B Gain Jumper Settings
+28 dB
+18 dB
+9 dB
0 dB
2-2 •Installation and Setup ADA-7802 User Manual (Iss. 09A)

Board Installation
Use the following steps to install the ADA-7802 cards in a RossGear audio or audio/visual distribution
frame:
Caution
The ADA-7802 and ADA-7802-600 cards can only operate in
RossGear AFR-7812C, AFR-7814C, or Leitch 880 Series
frames. Verify correct card and frame installation.
The ADA-7802V card can only operate in RossGear AVFR-
7854C and AVFR-7855C frames. Verify correct card and
frame installation.
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 ADA-7802 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.
Potentiometer Setup
Use Figure 2 and the following steps to set up the ADA-7802 potentiometers.
1. Set the A Gain potentiometer to the desired gain range. The potentiometer provides a
fine control of the gain and has a range of +/- 6dB.
2. Set the B Gain potentiometer to the desired gain range. The potentiometer provides a
fine control of the gain and has a range of +/- 6dB.
Cable Connections
This section provides instructions for connecting cables to the ADA-7802 when mounted in RossGear
frames. See the following frame rear panel diagram for cable input and output designations.
On the rear of the Ross frame there are removable connectors for the A and B channel inputs and
outputs. Each channel has 1 input and 4 outputs. Unused outputs do not need to be terminated.
Each connector has sockets for the positive, negative, and ground wires of a balanced analog audio
cable. Wire the cables to the removable terminal block connectors as outlined in the following figures
and procedure.
ADA-7802 User Manual (Iss. 09A) Installation and Setup •2-3

Figure 3. Connector Wiring for ADA-7802 Inputs and Outputs
1. Insert an audio 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.
Figure 4. ADA-7802 Cabling Designations for Rossgear 7812C and 7814C Series Frames
Note When using the ADA-7802 in MONO mode, use the same outputs as you
would when operating in STEREO mode. The outer labeling on the
frame diagram above refers to the cabling requirements for an ADA-
7801, which is a mono amplifier.
2-4 •Installation and Setup ADA-7802 User Manual (Iss. 09A)

Specifications
In This Chapter
This chapter contains the following sections:
• ADA-7802 Technical Specifications
• ADA-7802-600 Technical Specifications
• ADA-7802V Technical Specifications
ADA-7802 Technical Specifications
Category Parameter Specification
Input Impedance >35kΩ, balanced
Max Input Level +34dBu
Input
Common Mode Rejection >100dB @ 60Hz, >70dB @ 20kHz
Number of Outputs 4 stereo outputs, jumper selectable to
8 mono outputs
Max Output Level +28dBu
Output Impedance 66Ω
Output
Output Isolation >70dB
S/N Ratio >100dB (unity gain) relative to +8dBu
Gain Range -6 to +34dB (± 6dB fine adjustment)
Frequency Response ± 0.02dB 20Hz to 20kHz
Total Harmonic Distortion + Noise <0.002%
Intermodulation <0.002% (SMPTE)
Crosstalk between Amplifiers >100dB
Interchannel Crosstalk >95dB
Performance
Power Consumption @ +8dBu output 2.1W
All tests performed at +18dBu and cover 20Hz to 20kHz unless otherwise specified. All measurements
made with an Audio Precision test set. Specifications are subject to change without notification.
ADA-7802 User Manual (Iss. 09A) Specifications •3-1

ADA-7802-600 Technical Specifications
Category Parameter Specification
Input Impedance >35kΩ, balanced
Max Input Level +30dBm
Input
Common Mode Rejection >100dB @ 60Hz, >70dB @ 20kHz
Number of Outputs 4 stereo outputs, jumper selectable to
8 mono outputs
Max Output Level +23dBm
Output Impedance 600Ω
Output
Output Isolation >70dB
S/N Ratio >100dB (unity gain) relative to +8dBm
Gain Range -6 to +34dB (± 6dB fine adjustment)
Frequency Response ± 0.02dB 20Hz to 20kHz
Total Harmonic Distortion + Noise <0.007%
Intermodulation <0.006% (SMPTE)
Crosstalk between Amplifiers >100dB
Interchannel Crosstalk >95dB
Performance
Power Consumption @ +8dBm output 3.1W
All tests performed at +8dBm and cover 20Hz to 20kHz unless otherwise specified. All measurements
made with an Audio Precision test set. Specifications are subject to change without notification.
3-2 •Specifications ADA-7802 User Manual (Iss. 09A)

ADA-7802V Technical Specifications
Category Parameter Specification
Input Impedance >35kΩ, balanced
Max Input Level +30dBu
Input
Common Mode Rejection >100dB @ 60Hz, >70dB @ 20kHz
Number of Outputs 4 stereo outputs, jumper selectable to
8 mono outputs
Max Output Level +27dBu
Output Impedance 66Ω
Output
Output Isolation >70dB
S/N Ratio >100dB (unity gain) relative to +8dBu
Gain Range -6 to +34dB (± 6dB fine adjustment)
Frequency Response ± 0.02dB 20Hz to 20kHz
Total Harmonic Distortion + Noise <0.002%
Intermodulation <0.002% (SMPTE)
Crosstalk between Amplifiers >100dB
Interchannel Crosstalk >95dB
Performance
Power Consumption @ +8dBu output 1.5W
All tests performed at +18dBu and cover 20Hz to 20kHz unless otherwise specified. All measurements
made with an Audio Precision test set.
Specifications are subject to change without notification.
ADA-7802 User Manual (Iss. 09A) Specifications •3-3

3-4 •Specifications ADA-7802 User Manual (Iss. 09A)

Ordering Information
In This Chapter
This chapter contains:
• Ordering information for the ADA-7802 and related products
• Troubleshooting Checklist
• Warranty and Repair Policy
ADA-7802 Family of Audio Cards and Related Products
Standard Equipment
• ADA-7802 Stereo/Mono Audio Distribution Amplifier
• ADA-7802-600 Stereo/Mono Audio Distribution Amplifier
• ADA-7802V Stereo/Mono Audio Distribution Amplifier
Optional Equipment
• 7802D-004 Stereo/Mono Audio Distribution Amplifier User Manual
(additional User Manual)
• AFR-7812C Audio Products Frame and Power Supply (PS-7813)
(2 RU, holds 12 modules, includes 1 power supply)
• AFR-7814C Audio Products Frame and Power Supply (PS-7813)
(1 RU, holds 4 modules, includes 1 power supply)
• AVFR-7854C Analog Products Frame and Power Supply (PS-7103)
(1RU, holds 2 audio and 2 video modules, includes 1 power supply)
• AVFR-7855C Analog Products Frame and Power Supply (PS-7103)
2RU, holds 5 audio and 5 video modules, includes 1 power supply)
• PS-7813 Power Supply (85-264 volts)
(redundancy option power supply for Ross 7800 series 2RU audio product frames)
Your ADA-7802 is a part of the RossGEAR family of products. Ross Video Limited offers a full line
of RossGear Terminal Equipment including Distribution, Conversion, Monitoring, Synchronizers,
Encoders, Decoders, AES, Keyers, Control Switchers, as well as Analog Audio and Video products.
ADA-7802 User Manual (Iss. 09A) Ordering Information •4-1

Troubleshooting Checklist
Routine maintenance to this RossGear product is not required. In the event of problems with your
ADA-7802, the following basic troubleshooting checklist may help identify the source of the problem.
If the module still does not appear to be working properly after checking all possible causes, please
contact your Ross Video products distributor, or the Ross Video Technical Support department at the
numbers listed under the “Contact Us” section at the end of this manual.
1. Visual Review – Performing a quick visual check may reveal many problems, such
as connectors not properly seated or loose cables. Check the module, the frame, and
any associated peripheral equipment for signs of trouble.
2. Power Check – Check the power indicator LED on the distribution frame front
panel for the presence of power. If the power LED is not illuminated, verify that the
power cable is connected to a power source and that power is available at the power
main. Confirm that the power supplies are fully seated in their slots. If the power
LED is still not illuminated, replace the power supply with one that is verified to
work.
3. Reseat the Card in the Frame – Eject the card and reinsert it in the frame.
4. Check Control Settings – Refer to the Installation and Operation sections of the
manual and verify all user-adjustable component settings including correct BNC
designations.
5. Input Signal Status – Verify that source equipment is operating correctly and that a
valid signal is being supplied.
6. Output Signal Path – Verify that destination equipment is operating correctly and
receiving a valid signal.
7. Module Exchange – Exchanging a suspect module with a module that is known to
be working correctly is an efficient method for localizing problems to individual
modules.
4-2 •Ordering Information ADA-7802 User Manual (Iss. 09A)