Question

An SSB transmitter with a carrier of 2.3 Mhz is modulated by an intelligence signal in the 150-4.2kHz range. Calculate the frequency range of the lower sideband and upper sideband.

Answer 1

Solution:

SSB wave consists of either upper sideband or lower sideband.

carrier frequency f_c =2.3MHz  

Intelligence signal or message signal frequency f_m = 150 Hz to 4.2KHz

When  f_m = 150 Hz:

Lower sideband frequency f_LSB = f_c - f_m = 2.3M -150 =2.29985 MHz   

Upper sideband frequency f_USB = f_c +f_m = 2.3M +150 =2.30015 MHz

When  f_m = 4.2KHz:

Lower sideband frequency f_LSB = f_c - f_m = 2.3M -4.2k =2.2958 MHz   

Upper sideband frequency f_USB = f_c +f_m = 2.3M +4.2k =2.3042 MHz

Hence frequency range of the lower sideband  f_LSB =  2.2958 MHz to  2.29985 MHz

  frequency range of the upper sideband  f_USB = 2.30015 MHz  to  2.3042 MHz