Answer / raj

1.Antenna required to transmit human voice will need veru
long Antennas about 1 Km long Antenna.
2. If every body speaks at the same time, intereferance
will occur.

Answer / lakkup

for security purpose, to protect from noise,distortions
etc., modulation is used
so in order to transmit a signal ,modulation is done by
superimposing carrier signal on to the message signal
so when it is transmitted over the channel ,modulation
serves as a protective covering for the message signal.so at
the receiver side it is then demodulated to get the original
signal

Answer / r.venkateshwaran

It is used to combine the carrier signal and the modulating
signal....

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