d) A radio antenna pointed in a direction of the sky has a noise temperature of Ts = 50 K. The antenna feeds the received signal to a pre-amplifier operating at an ambient temperature of To 290 K. The pre-amplifier has a gain of 35 dB over a bandwidth of 10 MHz and a noise figure of 2 dB. - (i) Determine the noise power at the output of the preamplifier in dBm. (ii) Determine the signal power Pr (in dBm) at the antenna terminals such that the signal-to-noise ratio is 50 dB at the output of the pre-amplifier. You may take the Boltzmann constant as k 1.38 × 10-23 JK-¹.
d) A radio antenna pointed in a direction of the sky has a noise temperature of Ts = 50 K. The antenna feeds the received signal to a pre-amplifier operating at an ambient temperature of To 290 K. The pre-amplifier has a gain of 35 dB over a bandwidth of 10 MHz and a noise figure of 2 dB. - (i) Determine the noise power at the output of the preamplifier in dBm. (ii) Determine the signal power Pr (in dBm) at the antenna terminals such that the signal-to-noise ratio is 50 dB at the output of the pre-amplifier. You may take the Boltzmann constant as k 1.38 × 10-23 JK-¹.
Introductory Circuit Analysis (13th Edition)
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ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
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Transcribed Image Text:d)
A radio antenna pointed in a direction of the sky has a noise temperature
of Ts =
50 K. The antenna feeds the received signal to a pre-amplifier
operating at an ambient temperature of To 290 K. The pre-amplifier has
a gain of 35 dB over a bandwidth of 10 MHz and a noise figure of 2 dB.
-
(i)
Determine the noise power at the output of the preamplifier in dBm.
(ii)
Determine the signal power Pr (in dBm) at the antenna terminals
such that the signal-to-noise ratio is 50 dB at the output of the
pre-amplifier.
You may take the Boltzmann constant as k 1.38 × 10-23 JK-1.
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