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The simplest method for testing co-axial cable is use a multimeter and test for an open circuit between the core and screen when the cable is open at both ends, and 75 ohm when one is terminated.

The equipment at both ends of the cable must have a termination impedance of 75 ohms. Otherwise, signal loss may be apparent. Ghosting, picture roll and loss of telemetry signal may occur.

There are many types of co-axial cable, all manifesting different figures for signal loss, screening capability and cost. The signal is carried by the central copper core and signal is return along the braided screen and this is connected to the earth of a system. It also provides protection against...

You can use a field of view calculator, here is one for your trial.

http://www.pelco.com/support/tools/lenscalc.aspx

You probably require Wireless IP Camera using 802.11 network.

Most DVR doesn't have built-in VGA port. However, for recycling of old CRT monitor, you can use a video to VGA converter that cost not too much.

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A main drawback with using twisted pair is the need for a transmitter and receiver at each end of every cable run, so the cost of installation is higher, though the device is not really so expensive. The device is called UTP balun.

Twisted pair cable is one method for video transmission. It is common used in computer network. This type of cable provides balanced signal transmission (co-axial cable is unbalanced). As two wires inside the cable twisted together, they are even exposed to any sources of electrical or magnetic inte...

Normally dome is installed under the ceiling. However, if the ceiling is too high, it may be unable to give a good enough picture. I see some people turn the dome and have it installed on wall, however, this makes the picture also turned and seems not a proper method. There is now a kind of wall-mou...

New version of AVT 760 DVR is auto-switching between NTSC and PAL. Therefore, be sure the cameras are connected with electricity before your DVR is power on.

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