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. 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
Dry-Contact Outputs
Operation from AC or DC Power
Operating Temperature (Maximum):
131 F
Operating Temperature (Minimum):
32 F
Height:
1.40 in
Width:
1.20 in
Length:
3 inch
Inputs:
BNC, ground-referenced
Input Level:
0.50 V p-p video to 1 V p-p video
Outputs:
LOOP OUT, BNC, ground-referenced (Output must be terminated with 75 ohm connected load or with 75 ohm 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:
12 to 33 VDC or 12 to 24 Vac, @ 75mA