A modular approach to the design of F.M. communication equipment

Through the use of coils wound on subminiature ferrite bobbins, threaded ferrite cup cores and of newly released P.A.D.T. transistors, the I.F. strips of an FM communications receiver have been packaged into two compact, hermetically sealed, pre-tuned components. This ensures built-in optimum performance, reliability and standardisation of an important section of FM receivers for all frequency ranges and simplified maintenance. Similar developments for other sections of FM communications equipment and for Citizen´s Band Radio are referred to in this paper.