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Q. Two stations (using identical antennas, with diameters of 50λ and aperture ef?ciencies of 0.6 at 35 GHz) are separated by 30 km. With negligible antenna losses, antenna connection-path losses are Lt = Lr = 1.33 at a physical temperature of 285 K, while the antenna temperature is 85 K. The receiver at either station hasGa(f 0)=107, TR = 250 K, and BN = 12 MHz. The rain attenuation and clear-air attenuation are given to be 3.9 dB/km and 0.072 dB/km, respectively. Determine:
(a) The required output power to guarantee a system signal-to-noise power ratio of 45 dB when heavy rain falls over a distance of 6 km.
(b) The available noise power occurring at the receiver output.
(c) The output signal power occurring with and without rain, when the transmitted power found in part (a) is used.
Ferromagnetic materials have some 'residual magnetism' even when the current (proportional to H) is zero. Material with strong residual magnetism are useful for making permanent ma
For the circuit shown in Figure, use KCL and KVL to determine i 1 , i 2 , v bd and v x . Also, find v eb .
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For a 50kW three phase rectifier connected at 415 V to a point of common coupling with a short circuit capacity 500kVA modelled as an inductive source, design filters to make the s
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