Re: What is a carrier?
in the field of communication,if we want to transmit our voice signal or digital data in the form of electric signal,through electromagnetic wave medium,it is impossible because at low frequencies(upto 30khz) electromagnetic waves can not radiate from conductor(antenna) ,that to we need large power to radiate and huge antenna's,due to theoritical requirement of antenna length is 1/4 wavelength of the signal,
at high frequencies em radiation is high,so to transmit our signal we use a high frequency carrier called carrier,to transmit our signal along with carrier ,we modify the electrical charactaristrics of carrier such as amplitude,frequency,phase according to our instataneous signal,the process is known as modulation,
the high frequency signal is used to transmit low frequengy
voice or digital data, hence such high frequency signal is called as carrier