CCTV CAMERA TV SCREEN ERRORS?
May 19, 2009 by Surveillance Tips and Advice
Filed under More Surveillance Answers
Can you answer Jeremy160’s question about Surveillance?:
I recently purchased a simple wired cctv surveillance camera. Installing it was no problem. I needed 30 meters of wire from my front door to my tv set. In between i had to add some wire so i therefore soldered some lengths. The camera works well. Even the sound.
BUT i am constantly getting these two fuzzy lines on the screen which keep on going up and down the screen. They are very annoying. Is it maybe due to the fact that the wire is 30 meters long? The camera does actually work well because when i directly connected it to my tv it was 100% clear!. Or maybe is it the type of wire i used for it? (i used phone wire as it has 4 wires. I used 2 for video and 2 for audio).
I recently purchased a simple wired cctv surveillance camera. Installing it was no problem. I needed 30 meters of wire from my front door to my tv set. In between i had to add some wire so i therefore soldered some lengths. The camera works well. Even the sound.
BUT i am constantly getting these two fuzzy lines on the screen which keep on going up and down the screen. They are very annoying. Is it maybe due to the fact that the wire is 30 meters long? The camera does actually work well because when i directly connected it to my tv it was 100% clear!. Or maybe is it the type of wire i used for it? (i used phone wire as it has 4 wires. I used 2 for video and 2 for audio).
I am really frustrated. Can anyone try and help and guide me please?
Wireless Cctv Camera
Surveillance Feedback: It is likely the phone wire you used - if they are not shielded, they are basically acting as an antenna for whatever radio frequency or electromagnetic interference to get picked up.
If you must use twisted pair wire, at the very least use CAT5 (there are a certain number of twists that causes that type of cable to be “self-shielding” - though you don’t want to cross AC power cables or other sources or EFI/EMI). Regular analog phone wire is not shielded.
Better yet, while you did not tell us which camera you got, there are “extension kits” that the manufacturers sell specifically for their consumer security camera products.
Surveillance Feedback: Regardless of which cable type you are using, you are experiencing a phenomenon called ‘Hum’ or ‘Picture Rolling . Read this for a great explanation
For CCTV, this resolved by using a Hum Bar or Ground Loop Isolator as they are sometimes called. See the example below which will surely do the trick. Then type the word in a search engine to find your local supplier.