Question

Problem 8 Communication Link: Gain & Loss (14 points) You are given the receiver block as schematically shown below. It consists of a receiving antenna which delivers a signal to a bandpass filter. The antenna feed has a loss of -1.15 dB and the filter's loss is -2.4 dB. The filter's output drives an amplifier with gain of +40.7 dB and this RF signal is input to a mixer which performs a frequency 1translation to an IF signal (but the mixer has a loss of -8.2 dB). Finally, the IF signal travels through another bandpass filter with a nominal loss of -1.6 dB. If the signal strength output by the last filter is Psix = -86.3 dBm, what is the signal strength of the signal Pant at the antenna? How many milliwatts is this signal power? Antenna Oscillator Amplifier BP filter BP filter Mixer -8.2 dB - 1.15 dB -2.4 dB +40.7 dB - 1.6 dB

Answer 1

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So l!- Pogal = (de) Pant - 1-15 - 2.4 +42.7 -72 -1.6 d %3D Power fom Antenna to olp + 30-35 dB %3D But Pay fasing 86-3 dBm %3D Pant -86.3 dBm 30.35dB -869 -30-35 + 10 10 watts 2.34x107 mW t 922.571x15 Watts ANS 0-922 mW %3D ANS ! -30.3sdB Pant L: Psy value is too to'small] For conveesion dBM PAB IdBm ) dB =

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