April 15th, 2007 by Avital Guy
Recommended maximum distances for 24 VAC with 10-percent voltage drop.
(10-percent is generally the maximum allowable voltage drop for AC-powered devices.)
EXAMPLE: An enclosure that requires 80 vA and is installed 35 feet (10 m)
from the transformer would require a minimum wire gauge of 20 Awg.
NOTE: Distances are calculated in feet; values in parentheses are meters.
Category: Cables and Connections | 1 Comment »
April 15th, 2007 by Avital Guy
Video signal used in CCTV equipment is normally a one volt peak-to-peak signal and is impedance sensitive to 75 ohms for ideal video reproduction at the monitor. If these environments are not met, then the video will degrade in quality and performance. Distribution Amplification
If you need to view the security camera video at multiple locations from a single camera, there are a few different ways to set it. One option is by using a distribution amplifier. Security Camera video amplifier device takes the single video signal and amplified the the signal into multiple outputs; and provide you four identical outputs.
Equalizing Amplification
there are many factors that can affect the video signal, it is sometimes necessary to enhance the security camera video signal directly out of the security camera, through RG59 coax to a monitor, while still producing a clear video display across the entire length of the coax. In case like this the coax should not exceed 750 feet. For Example if you need to use RG59 because it’s more flexible and much easier to work with but the cable length must be 1,500 feet. The signal at this point is going to be weak and will display a very degraded picture quality on the monitor. If you have a weak signal from you security camera because of the cable length, simply amplified the week signal with an equalizing amplifier.
Category: Overview News, CCTV Technology, Cables and Connections | No Comments »
April 5th, 2007 by Avital Guy
If you are trying to setup your DSL router/Firewall for remote access to your Security DVR system, you need to open the port on your Router. You need to login to your router by opening Microsoft internet explorer and pointing it to your router local IP address (check your router documentation) after logging in to your router look for PORT FORWARDING Or PINHOLE in your router setting. In there you need to specify the port your remote security DVR is listening at. The port will be specifying in your DVR docs. The IP address you need to specify the local IP address of your DVR system (NOT YOUR DSL IP). After saving and restarting your router go to http://www.canyouseeme.org/ and specify the port you setup in your router. The result should show that the port is open. Repeat until you get positive result
Category: Overview News, Security DVR | No Comments »
April 4th, 2007 by Avital Guy
One of the most growing trend among security cameras are the infrared security camera. This security camera has infrared LED installed around the outside of the lens of the camera. This lighting give the camera the ability to capture a clear image in no light at all 0 lux. This camera will produce an image even when its in total darkness. Most Infrared buys use infrared security cameras for businesses and home where the light conditions are poor. Most infrared cameras are water and weather proof makes them suitable to indoor or outdoor environment without a need for housing.
Infrared cameras are often called “Night Vision” cameras because their ability to see at night. However, do not confuse “Night Vision” with “Day / Night Cameras”. Day / Night cameras use different technology to produce image at low light and they do not have infrared lights built in.
Infrared security cameras will produce full color picture during day time, But When it gets dark, the camera will switch to infrared mode and illuminate it’s built-in infrared LEDs. In infrared mode the image is captured in black and white - this is true of all infrared cameras. The level of light required to capture a good picture is referred to as a camera’s lux, the lower the lux the better the camera can see in low light. .
Infrared cameras are also compared by how far they can see in total darkness. This is by the strength of the infrared light, and how far the light will reach and reflect back. Check our infrared cameras, some of our infrared camera can reach up to 300ft.
Category: Overview News, Security Camera | 1 Comment »