comments:

The projector is the most important item: it has to use the minimum amount of power, as this is the one device that sucks up the energy.

Lumens are what to look for: - the light needed to project the image. So the less the lumens the harder it is to see the projected image. but the less energy used So you need to decide what is more important light projected or lenght of the projection.

Weight is an issue: remember you have to carry everything - the cheaper ones are the heaviest and not the greatest amount of lumens just shop around a little

The fact that the image from the Epsom came out of my stomach added to the concept.

NB: The way the video plug goes into the back of the machine is relevant. The plugs could stick in to your stomach. For some projectors this means that the image would have had to come out sideways and so you have to turn to see the image. I projected onto building walls, billboards and then onto smaller things like the packets of pesticides

**Similar models were nFocus, Play Big, IN74EX

the products: I looked at several

* I used and old Epsom Powerlite 5550C 
projector cost: $595

Battery time: 45mins on the battery
weight: 9.4lbs

* PK projector - 75 lumens -
not big enough image and
it had to be super dark -
very small hand held

Projector cost:         $499.99
Battery cost:             $ 99.99
Total:             $ 654.47

But I also had the BenQ MP510      from Texas instruments - 
1500 lumens 
cost:$499
Lasted 30 minutes on the battery
Weight: 5.7lbs 

Suppliers: the projector people 
http://www.projectorpeople.com/projectors/ 

http://www.free103point9.org/

Free103point9 is a nonprofit arts organization focused on establishing and cultivating the genre Transmission Arts by promoting artists who explore ideas around transmission as a medium for creative expression.
Excellent information historically and artistically and access to a lot of manuals

Free Radio Berkley - International Radio Action training Education
http://www.freeradio.org/

Is a great resource to go to put your transmitter together in Berkley. And basic information about transmitters

I used the Ramsey Stereo FM 25b          cost: $139.95

http://www.ramseyelectronics.com/ This was perfect for me as I did not want to have to get a license yet is strong enough to transmit into passing cars as well as across the road etc.

NB: I went cheaper and wanted to learn how to put the transmitter together myself so did the soldering myself - thanks the Tom Jennings it worked.

Remember to test at both low and high frequency as per the instructions because that will stop of a lot of interference from other radio stations!!!

Rechargeable Marine batteries were my best choice because they are basically spillproof

SeaGel RV Deep cycle Gel Battery 31AH - cost: $110
this battery had the longest useable time - everything running on it for about 45 - 50 minutes
Heavy 69 lbs - not so bad cause it was on my back
http://www.lifelinebatteries.com/marineflyer.php?id=3

Sea volt sealed PWC AGM 18" -
lasted about 22 minutesFurther information: http://www.cojoweb.com/rv-batteries.html

take what ever you can get the cheaper and smaller the better

Philips DVP5140 Multiformat DVD Player with DivX, MP3, Windows Media Support                         $45.98

http://www.amazon.com/

The backpack consisted of 2 used army backpacks. Modified and strapped front to back. I placed wood at the base of each backpack to hold the devices in place.