A portable lower back support having a center section, a right articulated section and a left articulated section. The receptacle is preferably cylindrically shaped with a closed base, an open top and a sidewall that extends from the base to the top. A resonant load tuning capacitance is utilized across the input of the inverter subsequent to the DC link input to the inverter. The demodulated digital signal is further downconverted to the appropriate baseband signal.