A superhet is receiving a signal from an AM modulator where the carrier
signal has an amplitude Ec and carrier frequency fc. The frequency of the information signal is fi
.
The modulator has following parameters.
*output -load- resistance - RT,
* modulation index - m,
* total amplification through the modulator stages - G_T
During the propagation through the air signal power is attenuated by a factor C (C < 1).
a. Calculate the input power received at the receiver.
This should probably be power available to the reciever? Where using modern electronic communications as the subjust textbook (this question is not out of the book though). I have been playing with a standard DSB-FC signal and chcanging that to power and then muliplying by the attenuation. not sure if thats the right approach though.
b. If the intermediate frequency of the receiver is f_IF, what is the maximum RF bandwidth the device can have if the receiver is not to suffer from image frequency problem.
c. If the RF bandwidth from part b is used and noise density (noise power per Hz) is N0, calculate the SNR at the input of the receiver.
d. If the total power amplification through the receiver stages is G_R find the output power of the receiver.
e. If the noise power at the output is identical to the noise power at the input of the receiver, find the NF for the receiver.