Video Balun
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Video Balun
Camera and Surveillance Accessories for More Effective Monitoring
A home or business surveillance system is only effective if it is a complete working system. Take a component out and you will have crippled equipment that could no longer protect you and deter crime effectively. Here are some of the most important camera and surveillance accessories you should have:
Power supplies
Power supplies connect equipment such as cameras or CCTVs and digital recorders to a source of electricity. Although many of the models being sold these days run on DC or battery power, there are some home and business owners who prefer to use electricity to ensure that their surveillance equipment ran continuously.
Some power supplies are also designed to handle both AC and DC outputs, particularly in camera and surveillance equipment that can make use of both alternately.
Transmitters & receivers
Transmitters and receivers are essential components of any surveillance equipment. A transmitter send signals over a pre-determined frequency to a receiver. These accessories often come as a pair or part of a kit. The effective range of transmission varies, depending on the model or make.
For surveillance use, most transmitters are small enough to be concealed or disguised using everyday items, although that doesn't automatically impair their ability to work with a compatible receiver.
Active-passive baluns
Active-passive baluns help ensure compatibility between systems, something that is critical in camera and surveillance equipment. To manage video images, many of the latest models now use internal baluns, even though almost any camera used for surveillance can be utilized with external baluns. The latest balun transmission systems can even handle HDTV signals. With active or passive baluns, users of camera and surveillance systems can eliminate the need for additional cables to connect one equipment to another.
Amplified microphone
A microphone is an important accessory for a camera and surveillance system if audio is required. Amplified microphones are more efficient in picking up sound waves within a room or area compared to ordinary microphones. Some models require an independent power source while others can tap power from another device such as a camera, for example.
Although amplified microphones have become a part of most surveillance systems, it's still good to note that there are laws that protect people against illegal 'bugging'. If you're purchasing an amplified microphone, be sure to check your local state laws regarding its proper use.
Camera brackets
In most surveillance systems, cameras are frequently mounted so they can monitor a wider area. To ensure the equipment's stability, there are camera brackets that are specifically designed to hold them up. Camera brackets are usually made with metal, wood or plastic. Many have interchangeable parts, so they can be used in different combinations. They are flexible enough to be mounted onto a ceiling or a wall. Camera brackets have limited strength, so it's best to check the maximum weight of surveillance equipment they can carry.
About the Author
If you are looking for professional grade video surveillance and surveillance accessories, visit HiddenPinholeCameras.com.
UTP cat-5 passive balun for CCTV camera system...?
I've been researching CCTV systems - standalone DVRs and cctv cameras - and I've come across something I don't completely understand. I'm looking at using "passive baluns" to connect each camera to the dvr. Now the descriptions in every listing I read says something along the lines of "passive device - no external power required". Does that mean simply that the BALUN itself doesn't need a power supply, or does that mean that when using baluns the CAMERA doesn't need an external power source?
It'd be awesome if the latter case were true, as my company is looking at a 16 camera system, and we'll be running somewhere around 4000ft of cable. It'd be nice if we could just run a cat-5 cable from each camera instead of a video cable to the dvr AND a power cable to a reserved power supply box.
Any suggestions?
p.s. - example of the baluns I'm looking at: http://www.2mcctv.com/product_info-VITEKVTTR1M.html
Thanks!
The Passive Balun means you can transmit a video signal using cat5 cable.
The advantage is that you can transmit video over a longer cable run, usually up to 300m using passive balun. Normal coaxial cables have a limit of around 90m. The twisted cable pairs in cat5 is also good at rejecting electro interferrence.
'No power required' or 'Passive' means that you do not need a powered amplifier or any power source to extend the VIDEO SIGNAL ONLY.....up to 300m.
'Active Balun' is a powered balun which means it will amplify the video signal up to 1200m or so.
If you use the cat5 cable to run power to the cameras, the balun will not make any difference to the distance you can feed power. After 60m of cable, the voltage on most cables start to drop.
If you want a long cable run to power your camera, use a 14v power supply for 12v cameras or 28v psu for 24v cameras. In this case any voltage drop over the distance of the cable will be slightly compensated by the higher originating voltage.
Here's a few tips
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1) Use a balun that has a power connector with it so you only need one device o make video & power conection on camera side e.g see the balun with the dc connector here http://www.cop-security-online.co.uk/acatalog/Shop__front_Passive_system_36.html
2) A trick I did on an installation with long distance cameras is use a 24vAC power supply then I used a 24vAC to 12vDC convertor guaranteeing I could get 12v on the camera end up to 250m away
Hope this helps.
Passive Video Baluns