Signal loss of IR security cameras at night

by anthony


We have an 8 channel dvr with 5 outdoor ir cameras fitted.

We are experiencing loss of signal and recovery of signal after 1/2/3 hours. This happens in evening. We have moved camera connections on dvr to no avail. Wiring is cat 5, Camera 1 and 2 are on a separate line, and cameras 3, 4 , 5 are on another line.

Cameras are rated at 300/500 milliamp and are 420 TVL Sony CCD.

Dvr has Watchdog feature, and automatically reboots after signal loss of Plus 1/2 hours.

Any Ideas


Hi Anthony,

From your description I am not exactly sure how the cameras are being powered. You mention "Wiring is cat 5, Camera 1 and 2 are on a separate line, and cameras 3, 4 , 5 are on another line." Which sounds like the video image for the cameras.

Regardless of that it definitely sounds like a power issue. When the Infrared LEDs on the camera are turned on the power draw increases dramatically. Because of this your power is dropping out to the cameras because it can't handle it.

I would look at doing a better job on the power distribution and possible add additional power to accommodate the increase in power when the LEDs are active.

You can learn more about Infrared and how it works by visiting this link.

Infrared Use in Security Camera Systems

And visit this link about power options. CCTV Power Supply Options

Hope that helps. If you have follow up questions you can add them to the comments below.

Peter Brissette
Site Owner and CCTV Expert

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Sep 28, 2010
low light video loss
by: Mark TTSE

I have seen this before. I found if the peak to peak voltage of the video signal falls below, I believe 1.5vpp, the camera will loose video signal to the dvr. When the lights are turned on the peak to peak voltage rises to 2.0vpp and the video signal returns.

Sep 25, 2010
by: Maz

I will advise you to download the following freeware and when cams have outages, u will get an SMS alert. Once you get SMS alert, u may visit the location and check whats wrong.

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