FM strength Measurement??

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buts101

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I want to build a simple strength meter which can measure the signal

strength of FM stations in my city(different places in the city) for project, which is in a week.

So, please help me with the circuit and tell me how can i display the

strength reading digitally. Please tell me how can i vary the frequecy

so that i can measure the strength for different FM stations.
 

You will need to build or buy a portable FM broadcast receiver. Then there should be some output from one of the IC pins that is the log of the signal strength. Then makd a digital volt meter with an ADC.
 

Why is there a log output from the IC? Is it an inherent part of the FM demodulation?
 

It is usually built that way so that the signal strength meters have a wider dynamic range.
 

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