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{"ops":[{"insert":"1. An RF amplif er has an S\/N ratio of 8 at the input and an S\/N ratio of 6 at the\u00a0output. What are the noise factor and noise figure?\u00a0\n2. A receiver with a 75-\u03a9 input resistance operates at a temperature of 31\u00b0C. The\u00a0received signal is at 89 MHz with a bandwidth of 6 MHz. The received signal\u00a0voltage of 8.3 \u03bcV is applied to an amplifier with a noise figure of 2.8 dB. Find (a)\u00a0the input noise power, (b) the input signal power, (c) S\/N, in decibels, (d) the\u00a0noise factor and S\/N of the amplifier, and (e) the noise temperature of the\u00a0amplifier.\n"}]}
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