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Consider a message signal m(t) containing frequency components at 100, 200, and 400 Hz. This signal is applied to a SSB modulator together with a carrier at 100 kHz, with only the upper sideband retained. In the coherent detector used to recover the m(t), the local oscillator supplies a sinusoidal wave of frequency 100.02 kHz. Determine the frequency components of the detector output.
A base stationcellular communicationsystems lossless antenna has a maximum gain of 16 dB (above isotropic) at 1,900 MHz. Assuming the input power to the antenna is 8 watts, what is the maximum radiated power density (in watts/cm^2)
Draw the positive, negative, and zero sequence networks for the system. Include all impedance values and determine the bus voltages at midnight? What problem(s) do you detect?
an unknown sensor is investigated by connecting resistors across the output and measuring the current through them. When a resistance of 30 is connected the current through it is 0.5A. When the resistance is replaced by 20
A long hallway has three doors, one at each end and one in the middle. A switch is located at each door to operate the incandescent lights along the hallway. Label the switches A, B, and C.
The boards have a weight of 40 lb, centered G. Determine the smallest angle Theta required for the man to support these boards, neglecting the man's weight and the friction between his shoes and the floor.
Find the largest allowable signal swing (peak-to-peak) at the collector to satisfy the two conditions: BJT remains active , and vbe limited to 5 mV . What is the corresponding allowable peak-to-peak input voltage vi
When the amplifier is operating with a bandwidth first of 10MHz, find? 1) The RMS input noise power level? 2) The audio output power level? 3) The RMS output noise power level?
A lossy resonator consisting of a series connected RLC circuit is attached to a voltage source Vs=Vo(e^(jpi/3)) a) Develop the voltage loop equation in terms of current i(t), R, L, C, and vs b) Find the corresponding phasor equation
A new phone company wants to provide very cheap voice-only cell phone capability to 200,000 simultaneous users in San Francisco. They transmit only 8kbs per duplex channel using FDMA (frequency division multiple access) and BPSK (1 bit/Hz).
Dissipations of Power in Lightbulbs, An incandescent lightbulb rated at 100 W will dissipate 100 W as heat and light when connected across a 110-V ideal voltage source
A torque of 18 N-m is applied to a rotating part. The moment of inertia is 0.078 kg-m2. How much time (in seconds) will it take to rotate the part 180°?
In a bus 1-persistence CSMA/CD with Tp=50us and Tfr=120us, there are two stations, A and B. Both stations start sending frames to each other at the same time. Since the frames collide, each station tries to retransmit.
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