An energy field that stops electromagnetic devices from working, secretly generated on the planet Orellius by Alixus to keep her stranded colonists dependent on a primitive way of life.
The duonetic field appears in the Deep Space Nine episode Paradise. Benjamin Sisko and Miles O'Brien beam down to an uncharted planet and find that their phasers, tricorders and communicators are dead, as is the transporter link to their runabout.
The human colonists there crashed ten years earlier and believe a natural property of the planet is responsible. Under the leadership of Alixus they have built a harsh farming community and let people die for want of the medicine aboard their ship.
O'Brien, using an improvised compass, tracks the field to a buried generator. Alixus chose the planet and installed the device before the supposed accident, in order to test her theories about human society. She is taken into custody; most of the colonists decide to stay.