Splitting a CCTV signal to two monitors
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Posted by Henry Hallam on May 4, 2005, 1:16 pm
Please log in for more thread options Hi, Is it possible to use an ordinary BNC T-splitter (one female, two male) to split the signal from a camera so that I can watch the video from a CCTV camera on a monitor while also capturing it on a computer with a capture card? Or would I need more sophisticated electronics? Thanks very much Henry Hallam | |||||||||||||||||||
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Posted by on May 4, 2005, 3:10 pm
Please log in for more thread options Henry Hallam wrote: > to split the signal from a camera so that I can watch the video from
a
> CCTV camera on a monitor while also capturing it on a computer with a
> capture card? Or would I need more sophisticated electronics? Yes, it's possible to split it that way although you will lose some of the strength of the video signal because both devices are terminated with a 75 ohm resistor. If one of the devices allows you to disable the 75 ohm load then that would be best, but I find the drop of splitting a signal once, to be tolerable. Another option is to buy an actual video splitter, or you could always remove the 75 ohm resistor from one of your devices :) | |||||||||||||||||||
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Posted by Robert L. Bass on May 4, 2005, 11:30 pm
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> Yes, it's possible to split it that way although you will lose some of
> the strength of the video signal because both devices are terminated > with a 75 ohm resistor. Most professional video monitors have selectable termination to switch the 75-Ohm in or out as needed. Most pro grade units have a feed through connection to allow viewing while passing the signal on to either another monitor or a recording device. > ... I find the drop of splitting a signal once,
> to be tolerable. Another option is to buy an > actual video splitter... If the camera isn't junk (eg, X10) you can split the signal two ways without discernable loss. Ordinary video splitters don't amplify the signal so they won't be any better and some can even make things a little worse. -- Regards, Robert L Bass =============================>
Bass Home Electronics
2291 Pine View Circle Sarasota · Florida · 34231 877-722-8900 Sales & Tech Support http://www.bassburglaralarms.com =============================>
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Posted by Frank Olson on May 9, 2005, 2:13 am
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>> Yes, it's possible to split it that way although you will lose some of
>> the strength of the video signal because both devices are terminated >> with a 75 ohm resistor. >
> Most professional video monitors have selectable termination to switch the > 75-Ohm in or out as needed. Most pro grade units have a feed through > connection to allow viewing while passing the signal on to either another > monitor or a recording device. It's called a "looping output". On most DVR's or multiplexers the "looping output" is used to go to another device such as a monitor which remains *fixed* on the one camera. You could loop all the inputs on some multiplexers to go to a second remote multiplexer at a guard shack for instance. The looping output on a monitor will only allow you to "see" what the first monitor does without any control over the camera input (if the second monitor's remote from the multiplexer). On a single camera system that wouldn't be a problem, but when you have more than two cameras you may want to exercise more "control" over what you see on the second monitor. | |||||||||||||||||||
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Posted by Robert L. Bass on May 9, 2005, 1:00 am
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>
>>> Yes, it's possible to split it that way although you will lose some of
>>> the strength of the video signal because both devices are terminated >>> with a 75 ohm resistor. >>
>> Most professional video monitors have selectable termination to switch >> the 75-Ohm in or out as needed. Most pro grade units have a feed through >> connection to allow viewing while passing the signal on to either another >> monitor or a recording device. >
> It's called a "looping output". On most > DVR's or multiplexers the "looping output" is used to go to another device > such as a monitor which remains *fixed* > on the one camera. He only has one camera. The looping feed through (looping) output of the monitor will work fine for his needs. > The looping output on a monitor will only
> allow you to "see" what the first monitor > does... That is precisely what the gentleman asked for. -- Regards, Robert L Bass =============================>
Bass Home Electronics
2291 Pine View Circle Sarasota · Florida · 34231 877-722-8900 Sales & Tech Support http://www.bassburglaralarms.com =============================>
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> Is it possible to use an ordinary BNC T-splitter (one female, two