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Radio Receivers - Engineering

Q1:

In a superheterodyne receiver

A the IF stage has better selectivity than RF stage

B the RF stage has better selectivity than IF stage

C the RF stage has same selectivity than IF stage

D none of the above

ANS:A - the IF stage has better selectivity than RF stage

In superheterodyne Rxr, IF stage allows only 455 kHz freq (received freq +local oscillator freq. =IF freq). ie IF stage is more selective than Rf stage.