VM 28
User Manual: VM-28
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The KRAMER VM-28 is an 8 Channel Video-Audio Standby unit, each channel having two
video and audio-stereo (or balanced Mono) inputs and one video and audio-stereo (or balanced
Mono) output. When a proper video signal exists on the input marked INPUT 1; it is transferred,
with the appropriate audio channels, to the output. When the video signal drops for any reason, the
VM-28 automatically routes the second video-audio source to the output and at the same time
activates a relay (alarm) and lights a LED on the front panel. When the video signal on INPUT 1
reappears, the unit switches back to it automatically. When power is off, INPUT 1 is routed to the
output. The machine can be forced to output the INPUT 2 signal by using a short to ground,
allowing each channel to be remote controlled with a pair of wires.
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INPUTS: 8 x 2 Composite Video, 1Vpp/75 Ω nom. on BNCs.
8 x 2 Audio-Stereo (or Balanced Mono) on terminal blocks.
8 x 1 remote control pin (for short to ground).
OUTPUTS: 8 x 1 Composite Video, 1 Vpp/75 Ω on a BNC connector.
8 x 1 Audio-Stereo (or Balanced Mono) on terminal blocks.
8 x relay contacts.
VIDEO BANDWIDTH: Up to 500 MHz.
AUDIO BANDWIDTH: Up to 100 kHz.
S/N RATIO: 73 dB.
DETECTION SYSTEM: ODD/EVEN fields.
SWITCH DELAY: Up to 3 frames.
DIMENSIONS: 19 inch, 2 U rack mountable.
POWER: 230 VAC, 50/60 Hz (115 VAC U.S.A.)
Made by KRAMER ELECTRONICS LTD. ISRAEL
Caution!
Electric Shock Hazard!
Servicing by Authorized
Personnel Only!
230 VAC, 50Hz
ACTIVATED STANDBY CHANNEL
67854321
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IN 1
IN 1
IN 1
IN 1 IN 1 IN 1
IN 1IN 1
IN 1
IN 1
IN 1
IN 2
IN 2
IN 2
IN 2
IN 2IN 2
IN 2
IN 2
IN 2
IN 2
IN 2
OUT
OUT OUT OUT
OUTOUT
OUT
OUT
OUT
OUT
OUT
IN 1 IN 2 OUT
IN 1 IN 2 OUT
IN 1 IN 2 OUT
IN 1 IN 2 OUT
IN 1 IN 2 OUT
Audio
Video Video Video
VideoVideo
Video
Video
Video
Audio
Audio
Audio
Audio
Audio
AudioAudioCH 1 CH 2 CH 3
CH 6CH 5
CH 8CH 7
CH 4
FUSE
