How do I connect a monitor with 3 BNC connectors to VGA card ?
The monitors which use only 3 BNC connectors have only connectors for Red, Green and Blue signals. The sync information in those monitors are typically fed through the same connector which carries the Green picture component. This arrangement is called “sync on green”. The sync could be as well in any other picture component signal, but I have never seen other than green picture component used for sync signal. Some PC graphcis cards support this function so you might check if you card and drivers support this option. If the hardware does not support sync on green then you need to build some electronics to convert normal VGA signals to sync on green RGB signal The picture below shows the idea of the VGA to 3 BNC connector cable with sync combinining electronics in it. The basic idea of the circuit is that it consists of sync combining circuit which combines the HSYNC and VSYNC signals to one composite sync signal. After the combining, the signal is just summed (at right level) to the gr
