Electronic Communication Systems 2nd Edition by Roy Blake

تمرين 20

An SSB transmitter transmits on the USB with a (suppressed) carrier frequency of 7.2 MHz. It is modulated by two tones, with frequencies of 1 kHz and 2.5 kHz and equal amplitude. The transmitter PEP is 75 W into a 50 load. The carrier and unwanted sideband are each suppressed by 60 dB.
(a) Calculate the peak voltage across the load.
(b) Calculate the average power into the load.
(c) Sketch the signal envelope in the time domain, showing voltage and time scales.
(d) Sketch the signal in the frequency domain, showing frequency and power scales.