Abstract: In a radio telephone device including a channel selector containing at least one frequency divider having a plurality of control inputs each associated with a respective frequency dividing ratio and each arranged to receive an electrical signal for influencing its frequency dividing ratio, the channel selector is further constituted by a single pole, multi-position switch manually actuable to supply a fixed reference potential to any selected one of a plurality of fixed contacts, and a matrix circuit having a plurality of inputs connected to the fixed contacts, a plurality of outputs connected to the frequency divider control inputs, and interconnection elements connecting the matrix circuit inputs to the outputs thereof and being constructed to be acted on from outside the matrix to establish a particular interconnection pattern between the matrix inputs and outputs before the device is first placed into use.