Daily Archives:July 08,2021

Retevis RM40 is a professional VHF radio newly launched by retevis, which is suitable for use on board. This new handheld marine VHF radio has powerful functions, including professional built-in DSC receiver, built-in GPS and active noise reduction technology, as well as high contrast dot matrix display and soft keys, which makes the operation more convenient and comfortable. Let's talk about its characteristics.  ...

There is no "distance" index in radio communication, because the ultra short wave communication is line of sight transmission, and the signal is blocked and interfered by buildings, hills, forests, electromagnetic fields, etc.,  ...