This double-sideband (DSB) radiotelephone transmitter is powered entirely by the instantaneous (not stored) energy produced in the operator’s voice. The RF output power in my prototype falls within the range of 5 to 15mW. The circuit is essentially a high-level DSB modulator/crystal-controlled RF oscillator.
DX QSO made by author:
10/13/09 W1VZR 57/459 Limerick, ME 160km 2.5mW Early ckt; resorted to “mouth CW”
10/22/09 AA1MY 57/33 Bethel, ME 160km 5mW 1st skywave voice-pwr fone QSO!
10/22/09 W1PID 59/54 Sanbornton, NH 109km 5mW Horrendous QRN; Fabulous QSO!