Kramer Electronics VS-1211 user manual Factors Affecting Quality of Results

All the models can be interconnected 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.

1.2Factors 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.

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