Solution
The converter you linked takes some different inputs and gives only one (coax) output. While it may work in reverse, I think you want to go the other way with a box that accepts a single (or multiple) inputs and gives you your choice of outputs; those that match the inputs on the projector you're looking at getting.

Assuming that you do not have a cable/satellite set top box, I think what you want is something like this:

http://www.amazon.com/RCA-CRF940-Modulator-Gold-Plated-Connectors/dp/B00008X5DD/ref=pd_cp_e_2

This accepts a coax cable input (antenna) and converts it to a composite video output as well as left/right stereo audio.

What we really need to know is what your video source is and what your video source outputs are as...
The converter you linked takes some different inputs and gives only one (coax) output. While it may work in reverse, I think you want to go the other way with a box that accepts a single (or multiple) inputs and gives you your choice of outputs; those that match the inputs on the projector you're looking at getting.

Assuming that you do not have a cable/satellite set top box, I think what you want is something like this:

http://www.amazon.com/RCA-CRF940-Modulator-Gold-Plated-Connectors/dp/B00008X5DD/ref=pd_cp_e_2

This accepts a coax cable input (antenna) and converts it to a composite video output as well as left/right stereo audio.

What we really need to know is what your video source is and what your video source outputs are as well as what projector you're looking at and what video inputs it has.

You also need to understand that just because you have a larger image displayed does not mean a larger screen resolution. Standard definition TV may look fine on a 25" standard definition TV, but will start to look blocky and distorted on much larger screens.

-Wolf sends
 
Solution