What technique is used to obtain variable selectivity?
A)Auxiliary AGC
B)Variable bandwidth tuning (VBT)
C)Delayed AGC
D)Electromagnetic interference (EMI)

Question

Quizplus · Accepted Answer

Variable bandwidth tuning (VBT) is used to obtain variable selectivity by changing the width of the intermediate frequency (IF) filter. This allows for the receiver to selectively filter out unwanted signals while allowing desired signals to pass through, resulting in variable selectivity. Auxiliary AGC and delayed AGC are used to control the gain of the receiver in response to changes in the signal strength. Electromagnetic interference (EMI) is a type of unwanted signal that can cause interference in the receiver.

What Technique Is Used to Obtain Variable Selectivity