hi ther can anybody help mewith a diagram for bnc wiring diagram and does 3g signals interfere with wireless cctv sys wired to a dvr thanks

BNC is the video connector. outer is ground -inner video. :-O

3g here works on 850 and 2112 mhz it might interfere with wireless for sure
GSM does on 950mhz +

As does wifi on 2.4 and 5.8 puts horizontal lines across the picture

you need good shielding and ferrite cores clamped across any long
cable runs.

make sure the video level is correct.

when its happening un-plug each camera in turn to find out which one is picking up the RF goo


z

thanks for the info will check it it out what it is is that there is a three g trasmitter inbetween the two cameras beside a bt exchange all that you can see on screen is lots of lines across the screen and frezzing pics