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(a) The speech quality for a particular mobile communication system is just acceptable when the received power at the terminals of the mobile receiver is -104 dBm. Find the maximum acceptable propagation loss for the system, given that the transmit power at the base station is 30W, base station feeder losses are 15 dB, the base station antenna gain is 6 dBi, the mobile antenna gain is 0 dBi and the mobile feeder losses are 2 dB. Express the field strength at the receiver antenna in dBμVm-1
(b) Calculate the maximum range of the system described in (a) using: A. the free space loss B. the plane earth loss, assuming a frequency of 2 GHz and antenna heights of 15 m and 1.5m
A 9.1 V zener diode exhibits its nominal voltage at a test current of 29 mA. At this current the incremental resistance is specified as 5 ?. The zener knee current is 1 mA. i. The zener knee voltage, VZK. ii. The zener voltage at a current of 10 ..
Which FET operates in both Depletion and Enhanced mode and how do you recognize the mode by just looking at the Family of Drain Characteristic Curves
A calibrated RTD with ALPHA = 0.0041/°C, R = 306.5 Ohms at 20°C, and PD = 30 mW/°C will be used to measure a critical reaction temperature. Temperature must be measured between 50° and 100°C with a resolution of at least 0.1°C.
Find the electric flux density field produced by a uniformly charged infinite cylinder of radius ‘a' using Gauss's law.
derive a general formula for percent clipping of a unit amplitude sinusoidal test signal; this is the percent of time during one period in which the signal is clipped. The formula includes peak sinusoidal voltage Vp that would appear at the ouput
A computer employs RAM chips of 256 x 8and ROM chips of 1024 x 8. The computer system needs 2K bytes of RAM, 4K bytes of ROM, and four interface units, each with four registers. A memory-mapped I/0 configuration is used.
A system samples a sinusoid of frequency 480 Hz at a rate of 100 Hz and writes the sampled signal to its output without further modification. Determine the frequency that the sampling system will generate in its output.
Various radio stations in a given geographical region are assigned different carrier frequencies so that the frequency ranges of the signals do not overlap. Suppose that a certain AM radio transmitter has a carrier frequency of 980 kHz.
An abrupt silicon pn junction at zero bias has dopant concentrations of Na = 1017/cm3 and Nd = 5 x 1015 cm-3 at T = 300K. (a) Calculate the Fermi level on each side of the junction with respect to the intrinsic Fermi level.
A three-phase induction motor operates at a slip of 3% and has a rotor copper loss of 300W. The rotational loss is 1500W. Determine (a) The air-gap power (b) The power output (c) If the rotor impedance is 0.2+j0.8 ohm/phase,
A 480 V permanent magnet ac motor is consuming 10 kW at power factor 0.80 lagging. Its speed is 1800 rpm. The winding resistance is 0.5 ohms per phase. Core losses are 100 W.
Resisitive load, A 4:1 step down transformer uses a 60Vac source on the primary windings.
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