Bad vga picture on long cable

**lez** · 09-21-2005, 07:05 PM

Finally got my carpc off the bench and in the vehicle.

First problem, bad vga picture, smeered text, ghosting of image etc.

Was fine on bench with a 2mtr vga extension lead, in vehicle with a 4mtr lead its poo.

Its not earth loop etc I have tried it off a mains-to-12v psu.

Should I just remove my seat and carpets to get this cable out and dump it in the bin or is this a common thing?

should I use a homemade cable from twisted pair cat 5 etc will that be better (cant see it being worse)

anyone else had this problem?

**mattress** · 09-21-2005, 07:34 PM

is it a high quality shielded vga cable? they're good up to and beyond 20feet (i don't know how that converts in meters

)

**Cris** · 09-21-2005, 07:50 PM

Use a high quality VGA cable.
And don't run it near any power wires.

**lez** · 09-22-2005, 03:06 PM

Ok tired some cat5, crap, identicle to the vga extension, had a hunt in my old stuff found 2 old extensions, joined them, perfect picture, but a mtr short. now need to find another m/f extension of 4 or 5 mtrs.

Its not picking up noise, its a ghost image, so its capacitance / resonance etc or standing waves (SWR).

The monitor input is 75ohm, thought that would kill most echos/noise.

It seems I spent a day removing/fitting the interior to have to do it again to swap it out for decent cable. Sometimes I hate ebay.........

**mattress** · 09-22-2005, 04:57 PM

have you tried the cable outside the car, on different displays? i would try this inside with a normal computer setup using the same resolution (if possible) that you were using in the car... does the image still ghost? maybe you're picking up some interference from a power cable or something ... better than wasting money on another cable that might not fix your prob