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The monitors which have 5 BNC connector inputs are easy cases because the signals they need are similar to the ones VGA card gives. The only difference that those monitors use 5 high quality BNC connectors instead of cheap 15 pin VGA connector.

There are ready made cables available because they are used with some high end PC displays and some workstations. If you want to make your own cable then look at the following diagram which is based on recommended cable diagram published in one Nokia monitor manual. The original circuit digram in the manual had some mistakes, but I have corrected all mistakes form the picture I have found.

This kind of monitor cables are available ready made on good computer ships, so you don't necessarily have to make one yourself (unless you want to). The grounding arrangements can vary slightly from cable to cable, the signal connections are the same in commercial cables.

Other wiring method suggested in "Notes on Video Conversion" by Samuel M. Goldwasser:

 

Coax Center Coax Shield --------------------------------------- Red Video (1) Red Return (6) Green Video (2) Green Return (7) Blue Video (3) Blue Return (8) H Sync (13) Ground (5,10) V Sync (14) Ground (5,10)

You can use either of those wiring schemes, both should work well and perform in the same way.

Here are some tips how to make the connection correctly:

• Use 75 ohm BNC connectors for terminating the cable on monitor end.
• Use 75 ohm coaxial cable for all connections. If you happen to put anything else to those connections you will regret that because the impedance mismatch will destroy the picture quality on high resolutions. If you can find 75 ohm mini-coaxial cable, that is best for short runs and easiest so solder.

For more information take a lookhttp://www.hut.fi/Misc/Electronics/docs/pc/vga2bnc.htmlfor information about the VGA to BNC cable details.

When plugging in the cable make sure that the Red, Green, Blue, Horizontal Sync (HSYNC, usually white or gray wire), and Vertical Sync (VSYNC, usually black wire) connections are firmly in place and plugged into the correct input.

Set each of your monitor's RGB input (if available) to 75 ohms. Set sync set to "external" and sync level to TTL (if there is such setting). These controls are usually switches on the back of your monitor.

If you don't get picture and you he the frequencies set right, try to exchange the HSYNC and VSYNC cables, especially if you connected them by the wire colors and not by the markings on the cable. The cable color coding in HSYNC and VSYNC is not universal standard, which means that different manufacturers can use different colors for HSYNC and VSYNC wires. And I have even seen cables where there has been mistake that the connectors for HSYNC and VSYNC were named wrong on the ready made cable!

 

(7*0.16)五芯同轴线缆