Arrangement for selecting radio channel for direct-mode transmission system between mobiles

摘要

The device includes is used with a system having a number of channels available for digital short range transmissions. When a channel is selected, the noise on that channel is monitored (1). A threshold level (3) is measured. If the threshold level is not exceeded, then a channel selector (2) steps through the other channels, to select the best performance channel. The new channel is then selected and the communications traffic carried on this route.