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,…

Working principle of Retevis RT9550 repeater

Working principle of Retevis RT9550 repeater   Retevis RT9550 repeater expand of the radio signal transmission distance by resending or forwarding the radio signal. Retevis RT9550 Repeater main work principle: a high-sensitivity receiver is responsible for receiving signals from different stations at a frequency point, and at the same time, a high-power transmitter is used another frequency…

Retevis Donate model RT35 for Scouting

Now Retevis Donate plan for scouting has been almost one month. A lot of scouting teams have submitted the applications. Here Retevis thanks for their supports. All the applications will be reply in 24hours.   Here I  introduce the model RT35 : the model we donate this time. The Feature: 1,Channel: US (22CH 462mHZ) EU(16CH,PMR446),you…

Short Review of RT90 dual band mobile radio

Finally the announced package arrived. Content: the new RETEVIS Duoband DMR mobile device RT90.  Now everything was unpacked and inInspected. Also a programming cable was included. RT90 Unboxing Finally the announced package arrived. Now everything was unpacked and inInspected. Also a programming cable was included.  The microphone makes a solid impression and has a pretty good workmanship. It should be…