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IRS series satellite are used for -
1.
IRS series satellite are used for -
A.
Forestry
B.
Education
C.
Remote sensing
D.
Astronomy
Answer» D. Astronomy
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A balanced modulator is used in standard AM to obtain the sum and difference frequencies.
The IF of an FM receiver operates at a center frequency of 455 kHz.
The demodulator recovers the audio signal from the IF output.
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Frequency modulation is achieved by varying the frequency of an oscillator with a modulating signal.
The mixer takes the RF signal along with the audio signal to produce the IF signal.
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The purpose of the balanced modulator is to remove the carrier frequency.
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