Abstract :
The increased use of mobile radio equipment has resulted in an emphasis on Intelligibility, reliability and a decrease in cost and weight. The use of the controlled magnetic cartridge in place of carbon has done a very effective job of increasing intelligibility. The use of plastic in the case of a band held microphone has resulted in a reduction in both cost and weight. Using some of the new high impact plastics, the case demonstrates physical characteristics that exceed those of metal on almost every point. This plus other modifications in the mechanical and electrical design of the unit gives a microphone that is more reliable at extremes in operational environmental conditions that are incurred in mobile use.
