Answer / sattar

TRF (tuned radio frequency) receiver is a popular type of
Am receiver as it is cheap and simplest.But it has tendency
to oscillate at higher frequency ,and its selectivity is
less and BW variation takes place during tuning.So,SHR
(super heterodyne rec) is used.
In SHR,the incoming Rf freq. is mixed with a local
oscillator freq.(LO) to generate a supersonic intermediate
frequency((IF) ) such that IF=LO-RF.This IF is independent
of RF charecteristics and hence gives uniform SELECTIVITY
and SENSITIVITY.
The RF amplifier provides image frequency rejection of SHR
amplifier and its Q-factor can be increased by using
GANGLED CAPACITORS at input and output.

Answer / lakkup

superheterodyne is used so that in order the incoming
frequency is converted to intermediate frequency by the help
of crystal oscillator ,so when tuning of particular channel
it can be easily received

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