In general,a transmitting antenna is........

The characteristic impedance of a coaxial cable is typically in the range of ..........

$A$ carrier wave of peak voltage $14\,V$ is used for transmitting a message signal. The peak voltage of the modulating signal required to achieve a modulation index of $80\%$ will be.......$V$

For amplitude modulated wave broadcast, which of the following conditions is suitable?

$A$ carrier is simultaneously modulated by two sine waves with modulation indices of $0.3$ and $0.4$; then the total modulation index is

If $f_a$ and $f_f$ represent the carrier wave frequencies for amplitude and frequency modulations respectively,then