Question Solved1 Answer Please answer all of the following. An amplifier has an output of 20W. What is its output in dBW? If an amplifier has a 30-dB voltage gain, what voltage ratio does the gain represent? Given an amplifier with an effective noise temperature of 10,000°K and a 10-MHz bandwidth, what thermal noise level, in dBW, may we expect at its output? What is the thermal noise level of a channel with a bandwidth of 10 kHz carrying 1000 watts of power operating at 50°C? Coaxial cable is a two-wire transmission system. What is the advantage of connecting the outer conductor to ground? It turns out that the depth in the ocean to which airborne electromagnetic signals can be detected grows with the wavelength. Therefore, the military got the idea of using very long wavelengths corresponding to about 30 Hz to communicate with submarines throughout the world. It is desirable to have an antenna that is about one-half wavelength long. How long would that be?

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Transcribed Image Text: An amplifier has an output of 20W. What is its output in dBW? If an amplifier has a 30-dB voltage gain, what voltage ratio does the gain represent? Given an amplifier with an effective noise temperature of 10,000°K and a 10-MHz bandwidth, what thermal noise level, in dBW, may we expect at its output? What is the thermal noise level of a channel with a bandwidth of 10 kHz carrying 1000 watts of power operating at 50°C? Coaxial cable is a two-wire transmission system. What is the advantage of connecting the outer conductor to ground? It turns out that the depth in the ocean to which airborne electromagnetic signals can be detected grows with the wavelength. Therefore, the military got the idea of using very long wavelengths corresponding to about 30 Hz to communicate with submarines throughout the world. It is desirable to have an antenna that is about one-half wavelength long. How long would that be?
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Transcribed Image Text: An amplifier has an output of 20W. What is its output in dBW? If an amplifier has a 30-dB voltage gain, what voltage ratio does the gain represent? Given an amplifier with an effective noise temperature of 10,000°K and a 10-MHz bandwidth, what thermal noise level, in dBW, may we expect at its output? What is the thermal noise level of a channel with a bandwidth of 10 kHz carrying 1000 watts of power operating at 50°C? Coaxial cable is a two-wire transmission system. What is the advantage of connecting the outer conductor to ground? It turns out that the depth in the ocean to which airborne electromagnetic signals can be detected grows with the wavelength. Therefore, the military got the idea of using very long wavelengths corresponding to about 30 Hz to communicate with submarines throughout the world. It is desirable to have an antenna that is about one-half wavelength long. How long would that be?
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Ans 1 output =20w{:[" output in dBw "=10 log " Power (in watts) "],[=>10 log 20],[=>13dBW","" Ans "]:}Ans?{:[A_(V)=30 dB.],[A_(v)=20 log((V_(0))/(V_("in ")))],[:.log((V_(0))/(V_("in ")))=(30)/(20)],[(V_(0))/(V_("in "))=10^(1.5)],[:.((V_(0))/(V_("in ")))=31.6]:}Ans-3{:[T=10","000K],[B=10MHz]:}Thermal noise (N)=KTB_(w)quad(K= Boltzmann's const ){:[=>1.38 xx10^(-23)xx10","000 xx10 xx10^(6)],[=>1.38 xx10^(-12)W]:}(c5){:[N(in dB omega)=10 log(1.38 xx10^(-12))],[=10 xx(-11.86)],[N=>-118.6dBW]:}" Ans-4 ... See the full answer