Basically,the product modulator is

The wavelength of the carrier waves in a modern optical fiber communication network is close to ........ $nm$.

An information signal of frequency $10 \text{ kHz}$ is modulated with a carrier wave of frequency $3.61 \text{ MHz}$. The upper sideband and lower sideband frequencies are:

The process of recovering the modulating signal from the modulated carrier wave is called:

$A$ carrier wave of peak voltage $12 \, V$ is used to transmit a message signal. What should be the peak voltage of the modulating signal in order to have a modulation index of $75 \%$? ...... $V$

$A$ communications Earth satellite: