Development of an inexpensive remote radio control system for slide projection

An inexpensive remote radio control system for slide projection has been developed. It consists of an electronic receiver/decoder designed for attachment to commercially available slide projectors and a self-contained, portable FM transmitter with a foldable (collapsible) antenna/pointer. The system allows remote lens focusing (forward and backward) and slide change (forward and reverse) to be accomplished over a 100-ft range. It offers desirable freedom of movement to the lecturer or behavioral researcher, by eliminating locational restraints imposed by the extension cord.