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The Iridium satellite communication system was designed with a link margin of 16 dB, and was originally advertised as being capable of providing service to users with hand-held phones in vehicles, buildings, and urban areas. Today, after bankruptcy and restructuring of the company, it is recommended that Iridium phones be used outdoors, with a line of sight to the satellites. Find some estimates of the link margins (due to fading) required for L-band communications into vehicles and buildings. Do you think the Iridium system would have operated reliably in these environments? If not, why was the system designed with a 16 dB link margin?
Three equal point charges Q form the corners of an equilateral triangle of side length "a". How much work is required to move one of the charges to a point half-way between the other two.
An isolated free electron is traveling through an electric field from some initial point where its coulombic potential energy per unit charge (voltage) is 17 kJ/C and velocity = 93 Mm/s to some final point where its coulombic potential per unit ch..
What would be the minimum allowable sampling rate for a pulse-duration modulator if it is required to handle a baseband frequency range from 50 Hz to 10 kHz
The circuit has a single Moore type output U which is 1 to unlock the lock, and 0 otherwise. Design the circuit with inputs Xa, Xb, Xc, and Xd, reset L, clock C, and output U. Use a 1-hot code for the state assignment. Implement the circuit with D..
Combinational and sequential Logic Design using CPLDs - Number systems and codes, Boolean Algebra, Logic gates and flip-flops
we know Ktw=1 Nm(rad/s) and its's rated torque 30Nm for the synchronous frequency 60 H. If this motor is running at 60Hz, its load torque changes from 30 to 10 Nm, what is the new motor speed.
A logic circuit realizes the function F(a,b,c,d) =a'b'+a'cd+ac'd+ab'd'. Assuming that a = c never occurs when b=d=1,find a simplified expression for F.
Design a Moore machine that has one input X and one output Z. Provide a complete design using D Flip flops. In this design, the output should be 1 any time the sequence 01101 occurs. Overlapping sequences are allowed.
A combinational circuit is defined by the following three Boolean functions. Design the circuit with a decoder and external gates. f = x y z + xz g = x y z + xy h = x yz + xy
Use contraction beginning with a 4-bit adder with carry out to design a 4-bit increment-by-2 circuit with carry out that adds the binary value of 0010 to its 4-bit input. The function to be implemented is S=A+0010.
If the mechanical power sent out from the machine is 100 kW at a rotating speed of 90% of the nominal speed. Compute the slip of the machine and find the power dissipation due to the rotor winding resistance.
The motor details are as follows: 1 hp, 10V, 2500 rpm, 78.5 % efficiency, Ra=.01 O, La=.002 H, Kb= .03819 V/rad/sec. The chopper is one quadrant, and the on-state voltage drop across the device is assumed to be 1V regardless of the current variati..
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