Super Heterodyne receiver characteristics
Q. Super heterodyne receivers- Published on 12 Oct 15a. Have better sensitivity
b. Have high selectivity
c. Need extra circuitry for frequency conversion
d. All of the above
ANSWER: All of the above
A super heterodyne receiver mixes the incoming signal frequency with the locally generated signal frequency to convert a received signal to a fixed intermediate frequency (IF). A local oscillator in the receiver generates a signal, which mixes with the incoming signal, and then shifts that to intermediate frequency. The IF signal is filtered and is used to detect the original signal. Super heterodyne receivers have better sensitivity, high selectivity but need an extra circuitry for frequency conversion.
