Kramer Electronics 123V User Manual

Kramer Electronics, Ltd.

USER MANUAL

Differential Video Line Amplifier

Model:

123V

IMPORTANT

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: Before proceeding, please read paragraph entitled

"Unpacking and Contents"

Table Of Contents

Section Name Page

1 INTRODUCTION 2
2 A WORD ON DISTRIBUTION AMPLIFIERS 2
3 HOW DO I GET STARTED? 3
4 UNPACKING AND CONTENTS 3

4.1 Optional Accessories 3
5 DIFFERENTIAL LINE AMPLIFIER / DA 4

5.1 Getting to Know your 123V 4
6 INSTALLATION 6

6.1 Rack Mounting 6
7 CONNECTING TO VIDEO DEVICES 6
8 USING THE MACHINE 6

8.1 Turning ON the Machine 6

8.2 Operation 7
9 TYPICAL APPLICATIONS 7
10 TAKING CARE OF YOUR MACHINE 8
11 TROUBLESHOOTING 8

11.1 Power and Indicators 8

11.2 Video Signal 9
12 Technical Specifications 9
Limited Warranty 10

List Of Illustrations

Figure Description Page

1 123V Front Panel Features 5
2 123V Typical Applications 7

List Of Tables

Table Description Page
1 123V Front Panel Features 6

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1 INTRODUCTION

Congratulations on your purchase of this Kramer Electronics Differential
Line Amplifier. Since 1981, Kramer has been dedicated to the development and
manufacture of high quality video/audio equipment. The Kramer line has become
an integral part of many of the best production and presentation facilities around
the world. In recent years, Kramer has redesigned and upgraded most of the line,
making the best even better. Kramer’s line of professional video/audio electronics
is one of the most versatile and complete available, and is a true leader in terms of
quality, workmanship, price/performance ratio and innovation. In addition to the
Kramer line of high quality format interfaces, such as the one you have just
purchased, Kramer also offers a full line of high quality distribution amplifiers,
switchers, processors, controllers and computer-related products. This manual
includes configuration, operation and option information for the 123V.

2 A WORD ON DISTRIBUTION AMPLIFIERS

Distribution amplifiers distribute one signal to several users. They vary in the
number of inputs, looping capability, number of outputs, operating format,
bandwidth and input/output coupling. Distribution amplifiers are used to
distribute one video and/or audio source to several video/audio acceptors for
simultaneous recording or monitoring one source.

A quality distribution amplifier amplifies the incoming signal (video and
audio), pre-compensates the signal for potential losses (resulting from the use of
long cables, for example) and generates several identical buffered and amplified
outputs. Often, a signal processor is inserted between the source and the
distribution amplifier for correction and fine-tuning of the source signal before
multiplication, so that all copies are corrected in the same way.

There are many factors effecting signal quality when it is transmitted from a
source to an acceptor:

! Source and acceptor signal handling capability. Since different equipment

offer different degrees of quality, the final result is determined by the
performance of the lowest quality item. Using a low quality source will
always result in low quality duplicates.

! The connection cables should be of the best quality you can afford. Low

quality cables are susceptible to interference, deteriorate signal quality
due to poor matching and cause elevated noise levels.

! Sockets and connectors of the sources and acceptors, so often ignored,

should be of best quality, as "Zero Ohm" connection resistance should be
assured. Sockets and connectors should match the required impedance (75
ohms is used in video). Cheap connectors tend to rust, causing breaks in
the signal path.

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! Amplifying circuitry quality is extremely important and should posses

high linearity, low distortion and low noise operation.

! The distance between source and acceptors plays a major role in the final

result. If long distances (over 15 meters) exist between sources and
acceptors - special means should be taken in order to avoid cable loss,
such as using higher quality cables or, if necessary, line amplifiers.

! Interference from neighboring appliances can have an adverse effect on

signal quality. Balanced audio lines are less prone to interference, but
unbalanced audio and video lines, even though the cables are shielded,
should be installed far away from mains carrying cables, electric motors,
transmitters, etc.

! In some cases, either an induced interference on the cable carrying the

signals, or ground loop problems may severely disturb the video image on
the screen. To solve this problem, a differential video line amplifier,
designed to eliminate the interfering signals, is needed.

3 HOW DO I GET STARTED?

The fastest way to get started is to take your time and do everything right the first
time. Taking 15 minutes to read the manual may save you a few hours later. You
don’t even have to read the whole manual. If a section doesn’t apply to you, you
don’t have to spend your time reading it.

4 UNPACKING AND CONTENTS

The items contained in your Kramer format interface package are listed below.
Please save the original box and packaging materials for possible future shipment.

Amplifier (123V) User Manual

DC Power Supply Kramer Concise Product Catalog

4 Rubber Feet Mounting Brackets

4.1 Optional Accessories

The following accessories, which are available from Kramer, can enhance
implementation of your machine. For information regarding cables and additional
accessories, contact your Kramer dealer.

! Rack Adapter - Used to adapt smaller machines to a standard 1U or 3U

rack. One or more machines may be installed on each adapter.

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