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The range of super-heterodyne receive tuning when fL0 > fc with broadcast frequency ranges 540 to 1600 KHz

The range of super-heterodyne receive tuning when fL0 > fc with broadcast frequency ranges 540 to 1600 KHz Correct Answer 995-2055 kHz

Concept:

A superheterodyne receiver changes the RF frequency to a lower IF frequency. This IF frequency will be amplified and demodulated to get a video signal.

The block diagram of a superheterodyne receiver as shown:

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Generally, Mixer will do the down Conversion in Superheterodyne Receiver i.e.

IF = fL – fs 

fL = IF + fs   ---(1)

fL = Local oscillator tuning

IF = Intermediate frequency = 455 kHz (Standard)

fs = Signal frequency

Calculation:

Given range of input frequencies is from 540 to 1600 KHz.

∴ The range of local oscillator tuning using Equation (1) will be:

fL(min) = 455k + 540 k = 995 kHz

fL(max) = 455k + 1600k = 2055 kHz

fL = 995  -2055 kHz

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