Kramer 4x1 Composite Video and Stereo Audio Switcher

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The VS-421 is a high-performance switcher for composite video and unbalanced audio signals. It switches any one of four audio and video signals to a single audio and video output.

  • High Bandwidth - 330MHz (-3dB).
  • Switching - Vertical interval or immediate (selectable).
  • Control - Front panel or contact closure.
  • Desktop Size - Compact size. Can be rack mounted in a 1U rack space with the optional RK-MEDN adapter.


INPUTS: 4 composite video/SDI, 1Vpp/75ohm, on BNC connectors; 4 audio stereo (or balanced mono), +4dBu typ. on RCA connectors.
OUTPUTS: 1 composite video, 1Vpp/75ohm on BNC connectors; 1 audio stereo/balanced mono +4dBu typ. on RCA connectors.
SIGNAL LEVELS: Up to 3Vpp video, +30dBu audio.
DIFF. GAIN: 0.1%.
CONTROL: 4 front panel buttons, contact closure.
DIFF. PHASE: 0.03Deg.
K-FACTOR: 0.05%.
LUMA S/N: >71dB.
SWITCHING: Vertical interval or immediate.
DIMENSIONS: 24.5cm x 18cm x 4.5cm (9.6” x 7” x 1.7”) W, D, H.
POWER SOURCE: 230V AC, 50/60Hz, (115V AC USA) 4.6VA.
WEIGHT: 1.4kg (3.1lbs) approx.
ACCESSORIES: Power cord.
OPTIONS: RK-MEDN 19" rack adapter.

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