in Electromagnetics recategorized by
34 views
0 votes
0 votes

An antenna pointing in a certain direction has a noise temperature of $50 \: K$. The ambient temperature is $290 \: K$. The antenna is connected to a pre-amplifier that has a noise figure of $2$ dB and an available gain of $40$ dB over an effective bandwidth of $12$ MHz. The effective input noise temperature $T_e$ for the amplifier and the noise power $P_{a0}$ at the output of the preamplifier, respectively, are

  1. $T_e = 169.36\thinspace K$ and $P_{a0} = 3.73 \times10^{-10}W$
  2. $T_e = 170.8\thinspace K$   and $P_{a0} = 4.56 \times 10^{-10}W$
  3. $T_e = 182.5\thinspace K$   and $P_{a0} = 3.85 \times 10^{-10}W$
  4. $T_e = 160.62\thinspace K$ and $P_{a0} = 4.6\times 10^{-10}W$
in Electromagnetics recategorized by
15.8k points
34 views

Please log in or register to answer this question.

Welcome to GO Electronics, where you can ask questions and receive answers from other members of the community.