The TX-VCR is the ideal choice in installations where a control signal is needed based on the absence or presence of valid video signals. The unique power supply input allows the TX-VCR to be powered from a wide variety of existing ac or dcpower sources
The TX-VCR has one video INPUT and a LOOP OUT videojack. The detection circuit bridges a 1V video line. The TX-VCR may be inserted in a video line with the loop-through video output feeding a terminated load. It may alternatively be installed at the end of a video line by installing a 75 Ω terminator to the LOOP OUT videojack. The terminator is supplied with the TX-VCR.
Video detection is based on valid sync signals. The TX-VCR responds to valid NTSC or PAL sync while ignoring 50 Hz and 60 Hzhum and related induction artifacts. The TX-VCR is able to detect signals as weak as 0.5 V p-p. When a valid signal is detected, the relay contacts close. Both a normally-open and normally-closed contact are provided, permitting the module to be connected as a video-present detector or as a video-loss detector. The front-panel SYNC LED lights when valid video is being detected.
If a local or remote loss of video audible alert is needed, the TX-VCR may be wired to an RDL BZR.
Detect Video Presence
Detect Loss of Video
Bridging or Terminated Operation
Detection of NTSC or PAL Signals
Operation from AC or DCPower
Input: BNC, ground-referenced
Input Level: 0.5 V p-p video to 1 V p-p video
Output: LOOP OUT, BNC, ground-referenced (Output must be terminated with 75 Ω connected load or with 75 Ω terminator supplied)
Control Output: N/O or N/C relay contacts
Relay Contacts: Single-pole/double-throw
Maximum Switching Power: 60 W (220 Vdc, 125 Vac, 2A)
Power Requirement: GROUND-REFERENCED, 12 to 33 Vdc or 12 to 24 Vac, @ 75mA
Radio Design Labs TX-VCR Video Controlled Relay - BNC
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