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A source with effective noise temperature 180 K feeds a three-stage cascade.The first stage has an input effective noise temperature of Tei= 210 K and available power gain of G₂,1 = 6.4. For the second and third stages, respective-ly, T₂2 = 260 K with G₁,2 = 5.8, and T.3 = 330 K with G₁,3 = 4.5. (a) Find T, for the overall cascade. (b) Find the cascade's operating noise figure.

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