hy all ,
I am a newbie in cctv. I've just finished my first project in a factory with a Samsung SDN 550 camera , 520 , and 6 i vision dome cameras and a 3S Systems DVR. Although the client accepted the project , i'm not satisfied at all about the results. I observed that the images were not so clear as i expected and the path zones between a light object and a dark one were not clear.
Anyway.. i wanted to ask you if the shielding from an utp cable must be connected to a ground or something.. Somewhere in this project i had to run a 180 meter utp cable to link the DVR video out with an LCD that was placed in another building , so i used tho baluns from GE security(passive) . I observed that if the shield isn't connected to the ground there are some lines that are over the image (hum,noise) but if i connect the shield to the DVR's case those lines dissapear but the image is distorted in the upper 1-2 centimeters of the screen. (something like little waves) .
Please let me know from your experience what should be done with the shields of the cables,what i have done wrong? What is better to be used UTP or coaxial? and which is the maximum cable length for the coaxial RG59 ?
I will appreciate if you paste a link about ground loops , that i don't know anything about.
With respect.
Eugen.
