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Connector Type
BNC Connectors
Relay Output Support
# of Relays
1 Relay
Ease of Installation
Intermediate (Installs < 60 minutes)
Radio Design Labs
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Provides a Control Signal Based on the Absence or Presence of Video Signal
Radio Design Labs TX-VCR Video Controlled Relay, BNC
Radio Design Labs TX-VCR Video Controlled Relay, BNC
Radio Design Labs TX-VCR Video Controlled Relay, BNC
Item# 77992
Price: Normally $183.72 
Hot Deal $119.92
Free shipping on orders over $175 - See Details


  • Detects video presence
  • Detects loss of video
  • Bridging or terminated operation
  • Detection of NTSC or PAL signals
  • Dry-contact outputs
  • Operation from AC or DC power

Essential Info

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 dc power sources

The TX-VCR has one video INPUT and a LOOP OUT video jack. 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 Ohm terminator to the LOOP OUT video jack. 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 Hz hum 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.

This item requires a 24V power supply such as the PS-24K for operation.


More Info


  • Input: BNC, Ground-referenced
  • Input Level: 0.5 V p-p video to 1 V p-p video
  • Output: Loop-through, BNC, Ground-referenced (Output must be terminated with connected load or with 75 O terminator supplied)
  • Control Output: N/O or N/C relay contacts
  • Power Requirement: 12 to 33 Vdc Ground-referenced, OR 12 to 24 Vac, @ 75mA
  • Relay Contacts: Single-Pole, Double-Throw
  • Maximum Switching Power: 60 W (220 Vdc, 125 Vac, 2 A)
  • Mounting: Bottom mount using adhesive strips provided; mounts directly to a flat surface using optional mounting brackets


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