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A transmitter for an FM radio station (WICB) in Ithaca, NY operates at 91.7 MHz with a power of 4.1kW. The transmitter is mounted on a tower 35m from the ground. Assume that the transmitter radiates isotropically (equally in all directions).
a) Calculate the time-average power density that a person standing at the foot the antenna tower will experience.
b) The IEEE safety limit for radiation exposure at this frequency is 0.2 mW/cm^2. Use this fact and your answer in part(a) to advise the local college students if it is a good idea to have a keg party at the base of the radio tower.
c) Supposedly people can pick up the WICB signal all the way at the shores of Lake Ontario 72 miles away. Calculate the average power density at this distance and the corresponding peak electric field amplitude.
A Y-connected load with an impedance of 12-j15 Ohms per phase is connected to a balanced Delta-connected 208V, 60Hz, three-phase, positive phase-sequence supply. Determine 1) the line and phase voltage, 2) the line and phase current
A heat pump maintains a dwelling at 68 F. When operating steadily, the power input to the heat pump is 5 hp, and the heat pump receives energy by heat transfer from 55 F well water at a rate of 500 Btu/min.
A modulating signal is amplified by a 80% efficiency amplifier before being combined with a 20 kW carrier to generate an AM signal. what would be The required DC input power to the amplifier, for the system to operate at 100% modulation.
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
Describe why the intrinsic carrier concentration changes with temperature. This would include from very cold temperatures to 600K+ temperatures. Why does an extrinsic semiconductor become intrinsic above ~ 500K
A cable TV company delivers video signals over coaxial cable to individual houses. Video signals occupy a bandwidth of 6 MHz and are stacked in frequency from 50 MHz to 656 MHz without guard bands
Electrons in silicon carbide have a mobility of 1000 cm^2/V-sec. At what value of the electric field do the electrons reach a velocity of 3 X 10^7 cm/s Assume that the movility is constant and independent of the elctric field.
A long narrow rod has an atomic density of 5*1028 m-3. Each atom has the polarizability of 10-40 F m2. Find the internal electric field when an axial field of 1 V/m is applied.
The signal x(t) = sin(2pi(100)t),was sampling with sampling period T=1/400 second, 1- obtain a discrete time signal x(n) 2-what is the maximum sampling period which allows perfect reconstruction
Let a series R-L-C network be connected to a source voltage V, drawing a current I. a) In terms of the load impedance Z=Z at angle of Z, find expressions for P and Q from complex power considerations.
a generic rectifier is supplied from a 115v 60hz ac source and operates with a firing angel of 30 degrees. For the output voltage of the rectifier find: The dc component The rms value othe ac component
Several of the voltages associated with certain circuit are given by V12 = 9 phase angle 30 degrees V, V32 = 3 angle 130 degrees V, and V14 - 2 angle 10 degrees V. Determine V21, V13,, V34 and V24
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