Question { Ariba, 220955 }

what are active and Passive Components?

Answer

ACTIVE COMPONENT:

THE COMPONENT WHICH WILL RETURN THE SAME FREQUENCY OF INPUT
SIGNAL


PASSIVE COMPONENT:

THE COMPONENT WHICH WILL CHANGE THE FREQUENCY OF INPUT
SIGNAL

Question { Analog Devices, 310437 }

What is the need for modulation?

Answer

NEED FOR MODULATION
1) TO REDUCE THE ANTENNA HEIGHT
2) TO MULTIPLEX THE MORE NUMBER OF SIGNALS
3) TO REDUCE THE NOISE & DISTORTIONS
4) TO NARROW BANDING THE SIGNAL
5) TO REDUCE EQUIPMENT COMPLEXITY

Question { 10330 }

what is angle and amplitude modulation? what is noise in
modulation?

Answer

angle modulation :it is the process of varying angle of a
signal ( carrier signal) with respect to instaneous
amplitude of another signal known as message signal.
***
angle in the sense either frequency or phase.

amplitude modulation :it is the process of varying
amplitude of a signal ( carrier signal which is with zero
reference ) with respect to instaneous amplitude of another
signal known as message signal

noise :
unnecessary things occured in the process of modulation
that may be either amplitude or frequency or phase.