The circuit used to separate information signals from the carrier wave is called a .......

Which type of propagation is used to transmit radio waves from one place to another?

$A$ $TV$ transmitting antenna is $128 \ m$ tall. If the receiving antenna is at the ground level,the maximum distance between them for satisfactory communication in line-of-sight mode is (radius of the earth $R_e = 6.4 \times 10^6 \ m$):

What type of modulation is employed in India for radio transmission?

The $...........$ is the link connecting the transmitter and the receiver.

For an amplitude-modulated wave, the audio frequency is $500 \, \text{cycles/second}$. What is the actual carrier frequency in $\text{cycles/sec}$?