I am part of a smaller church and our pastor recently asked if there was any way we could use multiple (3) projectors feeding from the same source during our services.
As I have become the default "Techie" I have begun trying to research this. Any help or suggestions are greatly appreciated.
If your projectors have VGA in + VGA out, that would be as simple as daisy chaining them with the source signal feeding the first one in the chain.
If the projectors do not, then a VGA Distribution Amp (ebay?) would be a relatively low cost solution.
With VGA, runs can be as long as about 100m without much loss. With other types of signal, eg. HDMI, DVI, etc. you will probably need Extenders ($$) for long runs. SDI can also have pretty long runs without loss, but SDI capable equipment are inherently more expensive (cameras, projectors, output devices, etc.).
Another alternative is a Matrox Triple-Head-to-Go unit which sees the source signal as one, and splits it up into 2-3 separate signals. This allows you to create, in say Photoshop or After Effects, or ??, a larger than single image (eg. 2048x768 or 3072x768 for 1024x768 projectors). Cabling would depend on Matrox model - HDMI, DVI. Not sure if they have a VGA model.