How to upgrade RT90 firmware

The Retevis RT90 is the latest Dual Band mobile to come on the ham radio scene. It can be compatible with DMR Tier II repeater network as well as local FM repeaters. It was specifically designed with the amateur radio operator in mind. Recently, some customers feedback that RT90 display white screen when operate it. Now,…

Win Retevis Hat for Amateurs

Amateur radios (also called ham radio),describes the use of radio frequency spectrum for purposes of non-commercial exchange of messages, wireless experimentation, self-training, private recreation, radiosport, contesting, and emergency communication. The term “amateur” is used to specify “a duly authorised person interested in radioelectric practice with a purely personal aim and without pecuniary interest;”(either direct monetary or other similar reward) and to differentiate it from commercial broadcasting, public safety…