RCA connectors to Arcade monitor..

[John]

This is really regarding how best to connect the CMT-7 to the arcade monitor.  The hookup on the CMT-7 is like this.



The R,G,B, H-sync, and V-sync are all RCA type connectors.  I basically stripped the wire and took the center conductor and connected to the arcade monitor's RGB and H+V.  It works pretty well now except for I notice there is quite a bit of ghosting.  I suspect this is because I didn't take the ground from the sheidl of the RCA and put on the ground or does anyone else know of a better to hook this up?

I found on search network's definition there is a diagram on RCA connector and sounds like the shield area is ground so I should probably take all the ground and wire it together and put it on the ground of the arcade monitor?

Here's the link on the RCA connectors.. http://searchnetworking.techtarget.com/sDefinition/0,,sid7_gci786116,00.html


thanks

John

[tom61]

Connecting all the RCA grounds to the monitor's ground should help. If you still get ghosting try adjusting the Focus Knob (usually found on the flyback).

[MameFan]

Are you sure those are true co-axial cables?  Most RCA patchcords like that, that are flexible, actually contain 2 inner wires that are twisted loosely around down the cable (not twisted pair, but definitely not coaxial).

In addition to grounding them, switch to heavy duty video-quality 75 ohm coaxial cable (RG59 or RG6, shouldn't matter for short distance), not twisted cable such as in those flexible RCA cables.  At the very least you'll end up with a ~ 20 guage center "data" wire (22 gauge on RG59)  instead of the tiny stranded ~24-26 gauge wire I've seen in most flexible RCA cables.

You will find your picture improving significantly.  It's how the higher end monitors with BNC connectors work.

Or, if you dont want to convert to rigit Coax, at the least, trim the length of these down to the shortest you can deal with, AND place a ferrite bead around both ends of the cable to reduce interference entering.. That's why VGA cables for computers have big protusions on each end, since they have such small stranded wire inside (though a common shield).  

Remember.. Original arcade wires going to monitors were typically 20 guage wire... thick enough to withstand some interference...

[John]

wow. Thanks for the great feedback.. going to take a trip to RadioShack.  I'll report again when I get a chance to try it.

John

[Trenchbroom]

Posting this for a friend who seems to be locked out of new posts for some reason but who is very seriously considering a purchase . . .

When connecting the CMT are you bypassing the JPAC?

[John]

Yes, I am bypassing the JPAC completely.  Since I am using the IPAC for the controls and the OptiPAC for my spinners (the trackballs I got USB interfaces from happ).  I Didn't feel like running from RCA to DB15 VGA and then from there through the JAMMA connect to goto the arcade monitor.

My connection is basiclaly from VGA's TVout --> SVideo (CMT-7 (RGB) --> mylex connect on arcade monitor.

John