design a DSB-SC modulator to generate a modulated signal km(t)cosωct with the carrier frequency fc = 500kHz (ωc = 2π x 500,000). The following equipment is available in the stockroom: (i) a signal generator of frequency 100 kHz; (ii) a ring modulator; (iii) a bandpass filter tuned to 500 kHz.
(a) Show how you can generate the desired signal.
(b) If the output of the modulator is k x m(t)cosωct, find k.