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very very important concept in commn receiver..
hetero= different signals: dyne= mixing..... so. in starting point of any reciever, different signal (one is received signal and other is local oscillator signal) are mixed up ..the output consists of sum and difference frequencies....that different freq(also called as intermediate frequencies 455MHZ for AM ,10 MHZ for FM) will be used for further processing..
ie wahtever may frequency of input signal ,it will dowm converted to a single common frequecy..now circuit is having only one frequency..
whereas opposite method is homodyning here no down converting or upconverting..so in input side of receiver ,different freq. will come ..circuit will malfunction if signal frq changes oftenly
for what i said..in my last post in this section......
actually we are using heterodyning method under the superheterodynr receiver
homodyning method under the name "tuned radio frequency receiver"
as i said the problem associated with homodyning method , presence of different freq.oftenly .so this pose a condition that circuit has to face new freq. oftenly which will affect its performance....
the problem associated with Heterodyning is something called "image signal "