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KRAMER ELECTRONICS LTD.
2
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.