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A key premise in many science fiction stories is the idea that radio and TV signals from Earth can travel through space and be received by listeners in another star system. Show that this is a fallacy by calculating the maximum distance from Earth where a signal could be received with a SNR of 0 dB. Specifically, assume TV channel 4, broadcasting at 67 MHz, with a 4 MHz bandwidth, a transmitter power of 1000 W, transmit and receive antenna gains of 4 dB, a cosmic background noise temperature of 4 K, and a perfectly noiseless receiver. How much would this distance decrease if an SNR of 30 dB is required at the receiver? (30 dB is a typical value for good reception of an analog video signal.) Relate these distances to the nearest planet in our solar system
Reflect upon the strengths, weaknesses, opportunities and threats associated with a business that you are familiar with (one you work at, one you completed your assignments on, or one you have just acquired knowledge about).
Add to the performance curves for β = 1; 5; 10; and 20 the curve for β = 0:1. Is the threshold effect more or less pronounced? Why?
A triangular periodic signal g(t) has an average value of zerovolts, peak to peak magnitude of 20 volts and a period T = 2seconds. Derive the average power of this waveform. Derive its rms value.
find the shortest length L of the line open-circuited at its load end so that the input impedance of the line at frequency f = 5GHz is the same as the impedance of a capacitor of capacitance C=10pf of the same frequency.
Create a plot of the measured SNR (dB) versus the number of bits. For comparison, plot the seismic data and the quantized one using 13 bits, 18 bits, 25 bits, and 31 bits.
Design a multiplexer which has four input lines, two controllines, and one output line and a demultiplexer which has one input line, two control lines, and four output lines using truth tables and k-maps.
An inductive load that draws 23 kW of power and 150 A ofcurrent is connected in parallel with another inductive load thatdraws 60 kW at 200 A. The combination is connected to a 600 Vsource. (a) Make a table showing each load and its complex power.
Two forces, F1 and F2, act at a point. has a magnitude of 9.20N and is directed at an angle of 59.0 degrees above the negative x axis in the second quadrant. F2 has a magnitude of 6.00N and is directed at an angle of 52.6 degrees
A piston-cylinder arrangement whose piston is resting on a set of stops contains 0.5 kg of helium gas at 100 kpa and 25oC. the mass of the piston is such that a pressure of 500 kPa will just life it off the stops.
Space charge region how it is formed and what are the factors on which the width of this region depends
A PCM-TDM system multiplexes 32 voice band channels each with a bandwidth of 0-4kHz. Each sample is encoded with an 8-bit PCM code. UPNRZ encoding is used.
Determining the o/p level from an attenuator of know i/p, An attenuator has an attenuation of 10 dB over the frequency range 10 MHz to 1.0 GHz
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