A new approach to transistorization of mobile radio telephone equipment

An equipment design is described in which transistors are employed in both receiver and transmitter to reduce power drain and increase reliability. The following design objectives are believed successfully met: Low power drain in receive condition. Tuning adjustments minimized by use of lumped ferrite filters for both first and second I.F. selectivity of receiver. All components easily and quickly accessible for maintenance. Up to eleven r.f. channels available within a one Mc/s band for both receiver and transmitter. Thus particularly adaptable to Maritime VHF. Manufacturing cost of same order as vacuum tube designs of similar r.f. power output. A detailed description is given of a compact unit, suitable for either underdash or trunk mounting in vehicular installations.