In the below diagram is the essential scheme for broadcasting from a radio station.
Based on our experience, a 6Km broadcast range is enough in the Indonesian context. Hence we can limit the power needed and the energy carried (Battery)
The Backpack Radio Station consist in: a 15 watt FM transmitter for the radio transmission, an easy to set and tune antenna, along with a specific android application for recordings and broadcast of the radio content. Also it includes solar cells to supply the energy to the battery and satellite phone for long distance communications.