KRAMER ELECTRONICS LTD.
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All the models can be i nterconnected in a variety of ways. For example, two VS-1211 units become 24x1 or
12x2, etc. Three or four VS-1211 units, depending on whether the system is RGB or RGBS, become a 12x1
video component switcher. Finally, the video signal bandwidth is 225MHz (typical), which permits the
switchers to be used in the most demanding applications.
1.2 Factors Affecting Quality of Results There are many factors affecting the quality of results when signals are transmitted from a source to an acceptor:
Connection cables - Low quality cables are susceptible to interference, they degrade signal quality due to
poor matching and cause elevated noise levels. They should therefore be of the best quality.
Sockets and connectors of the sources and acceptors - So often ignored, they should be of highest
quality, since "Zero Ohm" connection resistance is the target. Sockets and connectors also must match the
required impedance (75ohms in video). Cheap, low quality connectors tend to rust, thus causing breaks in the
signal path.
Amplifying circuitry - Must have quality performance when the desired end result is high linearity, low
distortion and low noise operation.
Distance between sources and acceptors - Plays a major role in the final result. For long distances (over
15 meters) between sources and acceptors, special measures should be taken in order to avoid cable losses.
These include using higher quality cables or adding line amplifiers.
Interference from neighboring electrical appliances - These can have an adverse effect on signal quality.
Balanced audio lines are less prone to interference, but unbalanced audio and video lines should be installed
far from any mains power cables, electric motors, transmitters, etc. even when the cables are shielded.