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Topic: Maximum distance for VGA signals.
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Steve Guttag
We forgot the crackers Gromit!!!
![](http://www.film-tech.com/ubbmembers/268e.gif)
Posts: 12814
From: Annapolis, MD
Registered: Dec 1999
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posted 08-17-2013 12:27 PM
Scott is correct. It is all about bandwidth and attenuation. How high is the frequency and what is the attenuation of the cable at what distance and at what frequency.
A typical mini-coax cable can go about 10.5m without visible degradation on XGA signals (1024x768). While you can certainly run longer and get an image...it WILL start to smear. As you move up in frequency (higher refresh rates and resolutions), the distance before smearing drops (geometrically). If you move up to a full-size RG59 or RG-6 (times 5, plus, if you want EDID to travel, you'll need to add additional conductors), you can push that out a bit...as I recall, RG-6 can carry XGA a full 100 meters. Note, only the R, G and B really need the fatter cable...the sync cables can be smaller and survive.
What is more popular is to use an Interface of some kind to boost the overall level as well as high frequency (think of it as a slit-loss correction) so that at the other end of the cable, you have essentially the same signal as if it was coming out of the device.
http://www.extron.com/product/product.aspx?id=rgb160xi&subtype=1&s=3
What most have taken to is to run everything on a CAT 5 style solution. Most are proprietary.
http://www.extron.com/product/product.aspx?id=mtpt15hda&subtype=5&s=4
Generally, the twisted pair solutions start to be more cost effective on longer runs. The cable is cheaper and easier to pull in though more fragile.
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