Question

the relation between maximum frequency of spectrum and minimum of spectrum for bandwidth is​

Answer 1

Answer:

What is the relation between bandwidth and frequency?

Your question should be “What is the relationship between carrier frequency and the signal bandwidth?”.

If c is the carrier frequency of a transmitted wave and s is the bandwidth of signal (which is covering the range of lowest signal frequency to highest signal frequency) then after modulating the carrier with the signal the carrier wave will be spread in the range of c1=c-s and c2=c+s.

For example if a radio wave of 1000kHz is modulated with 20kHz bandwidth audio signal then the transmitted wave will cover a range of 980kHz to 1020KHz.

Please note that you cannot and should not modulate a carrier wave of 1000kHz with a signal bandwidth of say 500kHz because then carrier wave would cover from 500kHz to 1500kHz and you cannot have a tuner circuit and rf amplifier to cover such a wide range.

The solution is to go for higher frequencies of carrier wave . In the above cited example it would be better to have a carrier frequency of the order of 10 MHz. So that after modulation the carrier wave would be spread in the range of 9.5 MHz to 10MHz which is plus or minus 5% of the centre frequency.

Explanation:

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