Comments on: VGA CAT5 extension cable

By: vicky goel

vicky goel — Tue, 01 Nov 2011 20:39:59 +0000

i want to make a vga to rca cable i want a diagrame for it cound any on help me for this

By: bb

bb — Wed, 28 Jan 2009 00:44:28 +0000

this worked great, http://www.vgaextend.net great product
i never thought it would work this good. i have my TV 50 feet away from my media center PC. HD baby HD for $13

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By: Robert

Robert — Wed, 07 Jan 2009 01:21:23 +0000

you can use this adapter http://www.vgaextend.net

By: pa

pa — Wed, 31 Dec 2008 01:36:38 +0000

i want to build a vga to rgb to hook to my tv can u help me i got an old vga cable and 3 rca conections….thanks

By: triggerman_77

triggerman_77 — Sun, 13 Aug 2006 10:22:29 +0000

Is it possible to make a VGA splitter using CAT5? Have you already created one and do you have a link that I can use as a reference for making one? thanks

By: triggerman_77

triggerman_77 — Sun, 13 Aug 2006 10:19:47 +0000

Is it possible to make a VGA splitter using CAT-5? let’s say a 4 output VGA. If you were able to create one do you have a website that I can check for reference? And don’t you encounter any change on the picture quality?

By: EMPORIUM

EMPORIUM — Fri, 04 Aug 2006 12:21:43 +0000

Your cable is out of spec. A good VGA cable requires 75 ohm internal cables. If you were to run that cable for a longer distance you would start getting convergance errors and rf problems. You might want to try building a high quality cable with five 75 ohm tv cables of equal length. Maybe a short run to a project box then a 5 cable fanout from the box.

By: nickk678

nickk678 — Wed, 19 Jul 2006 22:04:42 +0000

Is it possible to build a vga-> svideo converter?

By: Calvin Thomas

Calvin Thomas — Fri, 23 Jun 2006 01:54:12 +0000

This is cool. For those that don’t understand? There is a trick involved in this.
Every “pair” of wires in the cat 5 cable “must” be transmitting and receiveing the two sides of the SAME SIGNAL. IE, if there is a high frequency video signal on 1 wire, the corresponding ground return for that same signal MUST go through the other cable (the same color). That is what gives you the shielding effect. Any EMI induced in one wire has the counter EMI induced in the other half of the twisted pair. Since the counter EMI is induced in the exact same voltage but “backwards” to the original the EMI is canceled out at the end (where the monitor is at). If you make the mistake of just thinking of the cat 5 cable as 8 wires, you will never make a cable like this work. If you are carefull to ensure that each signal goes thru a “twisted pair”.. this will work.. as well as a shielded cable.
As I remember it, a VGA cable has 3 color signals going through it. One for Red, Green and Blue. The remaining 2 wires are used to piggyback the rest of the pins. Since they don’t carry high freguency AC, they don’t matter as much. Only the 3 AC signals for the 3 colors really matters for video quality.
Interesting.
The only pitfall of Twisted pair (cat 5) over Shielded (VGA Cable) is at higher frequencys. Once the wavelength of the EMI interference gets close to the twists per inch of the Cat 5 cable? The EMI can induce into one cable more then the other. This means the shielding effect works best at low frequencys (like power cables) Just keep it away from super high frequency stuff….. and make sure that any high frequency signals get transmitted and returned on a single pair of twisted wires.
If you understand this simple rule, you can send any high frequency signal over a Cat 5 cable as long as there are 4 or less high frequency signals. (Component only uses 3 so it will work). oh… It is recommended you keep the bends of the Cat 5 cable to a minumum. If you make a sharp bend in the cable, you can cause signal degradation at the bend….

By: Drew

Drew — Thu, 22 Jun 2006 18:07:35 +0000

Actually, VGA to component adapters are pretty easy to find:

http://www.partsexpress.com/pe/showdetl.cfm?&DID=7&Partnumber=181-700

By: ex-parrot

ex-parrot — Thu, 22 Jun 2006 02:38:22 +0000

wrathofpyro: no. different video standards.

luiz_borges: I got a lot of ghosting etc over even a fairly short run doing that, but I suspect the cable runs over top of some lighting or heating wires in the ceiling. ymmv. worth a try though I would think :)

By: wrathofpyro

wrathofpyro — Thu, 22 Jun 2006 01:37:52 +0000

If I am reading your comments correctly, I can use a y pb pr cable with my ps2 to hook it up to this hack then to my monitor?

By: luiz_borges

luiz_borges — Thu, 22 Jun 2006 01:31:13 +0000

What about a extender with stereo audio signal AND s-video? audio uses two pair, the s-video uses the other two… so far its fine, but how about noise one on the other? Is a booster recommended? Anyone knows how to make a booster for AV???

By: tek

tek — Wed, 21 Jun 2006 23:41:30 +0000

VGA is NOT the same thing as component :D

VGA is R/G/B. Component is NOT, however you can transmit VGA over RGB cables, which are the same as component just the signals are not the same, This is why we don’t see VGA->Component adapters. A short explanation….

“Component video consists of three signals. The first is the luminance signal, which indicates brightness or black & white information that is contained in the original RGB signal. It is referred to as the “Y” component. The second and third signals are called “color difference” signals which indicate how much blue and red there is relative to luminance. The blue component is “B-Y” and the red component is “R-Y”. The color difference signals are mathematical derivatives of the RGB signal.”

Component operates on difference, not additive color.