Data exchange between two computers occurs through which type of signal?

If the area covered by an $FM$ radio station is to be tripled,the height of the antenna must be .......

$A$ $..........$ is used in the receiver section to reduce the magnitude of signals.

What should be the height of the transmitting antenna and the population covered if the television telecast is to cover a radius of $150 \, km$? The average population density around the tower is $2000 \, / km^2$ and the value of $R_e = 6.5 \times 10^6 \, m$.

In a communication system,a repeater is used to extend the range of transmission. It is a combination of:

$A$ speech signal of $3 \text{ kHz}$ is used to modulate a carrier signal of frequency $1 \text{ MHz}$ using amplitude modulation. The frequencies of the sidebands will be: