CCTV Security Camera News in Da Nang Vietnam

Archive for the ‘Security Accessories’ category

About Wireless Transmitter and Receiver

When it is difficult to run a cable to transmit video signals of the camera to the monitor, you might want to consider wireless transmission. But, the wireless signals may be attenuated or blocked by heavy metal walls, high voltage power lines, microwave equipment and others. The wireless system is strictly controlled by the FCC. […]

About RG59, RG6, & RG11 Coax Cables

RG stands for military specs Radio Guide (which is old and meaningless anymore) and the RG numbers are kind of arbitrary. The most common RG designations seen these days are RG-6, RG-8, RG-11, RG-58 and RG-59. RG-58 and RG-8 are 50 ohm coaxes, unsuited for video work. RG-6, RG-59 and RG-11 are all 75 ohm […]

About Cables for CCTV Systems

Coaxial Cable Coaxial cable has proper electrical features to transmit the video signals from the camera to the monitor. Among various coaxial cables, RG59/U is most common with a 75-ohm impedance and can be installed up to 450ft distance without loosing the video quality. This cable is usually connected by BNC connectors at both ends. […]

About Lens Mount

C-Mount Lens The flange back (distance from the surface where the lens comes in contact with the camera to the focal point) of C-Mount lens is 17.526mm(0.69 inch). This is the only difference between the C-Mount lens and CS-Mount lens. C-Mount lens, as well as CS-Mount, is 1 inch diameter with 32 TPI (threads per […]

Varifocal Lens

Varifocal lenses are special lenses that are used with some security cameras. C-mount cameras do not come with lenses. That is primarily due to the complexity of a user’s needs and the security application. There are many fixed lenses you can purchase to achieve the shot you are looking for. However, varifocal lenses are a whole different story. […]