Mobile radio problems resulting from new techniques

As in most fields, mobile radio problems arise not only from new radio techniques, but also from new non-radio techniques. The radio engineer is continually developing new methods for using existing frequencies and new means for utilizing portions of the radio spectrum, previously inaccessible because of technical barriers. Each new development finds application as an incidental and integral part of many operations which are widely removed from the communication purposes. These applications in turn engender new demands on the radio industry and the cycle of progress moves on. It is the purpose of this paper to point out a few of the communication problems that have arisen and trends which will, in all probability, introduce new communication headaches which we, as radio engineers, must eliminate.