A Field transmitter is a Terran communications device used by military personnel.
It is mainly used in situations where stationary devices would be impractical than portable ones. Such situations include entering unknown enemy territory or areas under constant attack. Equipped with its own miniature fusion generator, the device is powerful enough to transmit information across a solar system in real time.
Field transmitters are generally used to coordinate troop movement, calldown supplies and/or reinforcements, and relay information to friendly bases or space vessels.