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The one way bandwidth available to a single operator in the telecommunication system is 12.5 Mhz with a bandwidth of 30 Khz and 21 control channels. Calculate the efficiency with which this system utilizes bandwidth for a particular installation. Following parameters are available: • A common definition of spectral efficiency with respect to modulation or modulation efficiency in Erlangs/Mhz/Km2, is ? m = (Total traffic carried by the system) / (Bandwidth) (Total coverage area) • Total coverage area = 4000 Km2 • Average holding time of a call = 100 s • Average number of calls per unit during the busy hour = 1.2 • Call blocking probability = 2% • Cell area = 8 Km2 • Frequency reuse factor = 7 Questions : i) Calculate the number of calls/hour/cell and the number of calls/hours/km2 ii) Calculate the number of users/hour/cell and the number of users/hours/channel iii) Find the modulation frequency for this system.
A three-phase, 5kVA, 208 V, four-pole, 60Hz, Y-connected synchronous generator has negligible stator winding resistance and a synchronous reactance of 8 ohms per phase at rated terminal voltage.
A BJT is operating at a collector current of 1mA ,when Vce=1v and it has early voltage of 75v.If Vce is increased to 11v,find collector current
A 440-V three-hase Y-connected synchronous motor has a synchronous reactance of 1.5 ohms per phase. The field current has been adjusted so that the torque angle is 28 degrees when the supplied power to the motor is 90kW.
John take a 1kΩ resistor, the 10μf capacitor, and the 10 mH inductor, and one by one connects them across one of the outlets in his dorm room. How much power is dissipated by each component (as a function of time)
A circuit has a Thevenin equivalent circuit consisting of a voltage source of 10 V and an output resistance of 20 O. A non-ideal voltmeter is used to measure the source voltage. What will be the measured voltage if the voltmeter has an input resis..
determine the corediameter required for the fiber topermit its operation over the wavelength range 1.48 to 1.60um. calculate the new fiber core diameter to enable single mode transmission at a wave length of 1.30um.
Compute i2(t) through resist R, Find value of w0 for which the amplitude of the current |I2| is maximum, compute I2 for w=w0. Does I2 depend on R is there a contradiction with ohm's law
Describe how three-position control might be used to cause a windmill to always face into the wind. The windmill is rotated with a bidirectional DC motor.
1.The signal is 10 sin (pi 500t +30deg). The amplitude of this signal is 2.The signal is 2 sin(pi 1500 t + 60deg). The frequency of the signal is 3.The signal is 5 sin(4 pi 800t - 80 deg). The phase of this signal is
Determine the minimum bandwidth, baud, and bandwidth efficiency for the following bit rates and modulation schemes - 8-QAM and 16-QAM. Fb = 2400 bps Fb = 4800 bps Fb = 9600 bps
An earth station receive antenna has a sky component temperature of20 K, a ground component temperature of 15 K . What is the total antenna noise temperature [K]
Reference the textbook problem 6.12. Design a system using the photoconductive cell in Figure 6.9 to measure and display light intensity. Make the design such that 20 to 100 mW/cm2 produces an output of .2 to 1.0 V. What is the readout error w..
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