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Question about Electronic Communications1. A microwave system requires a +4-dBm audio level to provide 100% modulation. Determine the voltage level required if this is a 600 ohm audio system.2. Determine the noise produced by a 500 ohm resistor at 26 degrees Celcius over a 2 MHz bandwidth.3. Consider an amplifier with an output of 2 mV rms and noise 0.76 mV rms. What is the signal to noise ratio? Express it as an absolute ratio and in dB.4. Suppose that a series RLC circuit has R = 25 Ohm, L = 2 mH, and C = 0.8 microF. Compute the resonant frequency in kHz.5. A filter has a bandwidth of 20 kHz and a peak output at 300 kHz. What is Q?6. Calculate the percent modulation if the maximum p-p carrier in V is 200 and the minimum p-p is 40 V.7. A 750 W carrier is modulated at an 85% level. Find the total transmitted power.8. Consider a spectrum analyzer and suppose that V1 = 5 V, V2 = 0.1 V, V3 = 0.4 V, and V4 = 0.2 V. What is the total harmonic distortion?9. For a certain AM signal, the fundamental is 3 V. If a harmonic at 4 kHz is 0.07 V, what is the relative harmonic distortion?10. A 1 MHz 40-V peak carrier is modulated by a 5-kHz intelligence signal so that m = 0.7. This AM signal is fed to a 50 Ohm antenna. Calculate the power of each spectral component fed to the antenna.
Determine the voltage required on the input of the amplifier to give the maximum output of 85 dBuV. If the signal level from the aerial is 5 dBmV and the input noise level is 20 dBuV, calculate the signal-to-noise ratio on the output of the amplifi..
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Calculating a DC Current through the telephone handset, A telephone handset has a resistance of 600 ohm. It is connected to the local telephone exchange at a distance of 5 km by a twisted pair that has a loop resistance of 200 ohm per km
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Maximum Amount of Channels A Link Can Carry, A microwave radio link operates over a bandwidth of 400 MHz at C band. The link carries a number of channels of data using FDMA.
Binary symmetric channel, Assume that we are transmitting binary digits over a binary symmetric channel. Let p(x=0)=p(x=1)=0.5.
A filter has the following characteristics: Attenuation is 0 dB from 0 Hz to 2.5 kHz. Phase angle decreases linearly with increasing frequency above 2.5 kHz. Above 5 kHz the filter has steadily increasing attenuation.
A radio receiver has a noise power N = kTB watts, with T = 100 K and B = 1.0 MHz. The value of k is 1.38 x 10^-23 J/K. What is the noise power in dBW?
Characteristics of a filter, A filter has the following characteristics: Attenuation = 3.0 dB from 0 Hz to 2 kHz. From 2 kHz to 20 kHz attenuation increases from 3 dB to 23 dB in a straight line when plotted on axes of power in decibels (vertical a..
Plotting Continuous time signal, Consider the following continuous signal: x(t) = 10e^-3t u(t) Using Matlab, plot the continuous-time signal over the range -1=
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