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If 20 MHz of total spectrum is allocated for a duplex wireless cellular system and each simplex channel has 25 KHz RF bandwidth, find: (a) the number of duplex channels (b) the total number of channe
Assuming the resistance versus temperature function to be linear, determine the expected resistance of the material at 0 degrees celcius( the freezing point of water) and at 100 degrees celcius (the
An electrical device has a linear temperature response. The device has a resistance of 120Ω ata temp of -20 degrees celcius and a resistance of 190 Ω at a temp of 120 degrees celcius. a.
Nichrome wire is used to construct heating elements. Determine the length of 1.0 mm diameter Nichrome wire needed to produce a heating element which has a resistance of 2.0Ω at a temperature o
If the output of a low-pass RC filter is 12 dB below its maximum at f = 1 kHz, then how far below the maximum will the output be when f = 10 kHz
What is the equivalent admittance of the circuit for Z1 = 12, Z2 = 5 - j7, Z3 = 4 + j36 and Z4 = j10 (all in ohms) Note: Z1 and Z3 are in parallel connected to Z2 + Z4 in series, equal Zt || to Z1||Z3
An analog system requires an antenna signal power of 100pW to meet the required detected signal-to-noise ratio. Other system parameters are given as follows: Gt(dB) =4dB determine the minimum value
Calculate the minimum number of PN bits required for each frequency hop for an FHSS system that employs a total bandwidth of 800 MHz and an individual channel bandwidth of 200 Hz. If this system use
A) Determine the individual residues at the single poles at s = 0 and at s = -1 B)determine the two residues at the complex conjugate poles C) using the inverse laplace transform of the single poles a
a) An Si p+-n junction has A=1/100 cm^2 and N(donor)=10^15/cm^3 on the n side. Calculate junction capacitance with reverse bias of 10V. b) An abrupt p+-n junction is formed in Si with donor doping of
An emitter-follower circuit is built using an npn transistor with ß=100 and with RE =1k-ohm. What is the input impedance of the open circuit. If a load of 100-ohm is connected to the output of
A balanced transmission line picks up an undesired signal with a 5-mW level. After conversion to an unbalanced signal using a center-tapped transformer, the undesired signal is 0.011 uW. Calculate t
where ω0 is a constant, and Y, θ are statistically independent random variables. Assume that Y has a mean value of 3 and a variance of 9, and that θ is uniformly distributed from -
A gold wire (resistivity of 2.44× 10(-8) Ω·m and a temperature coefficient of 3.4×10(-3) °C-1) with a radius of 0.100 mm has a uniform electric field of 2.50 V/m imposed along
(a) Calculate the radius of the orbit that would be perfectly circular under the Coulomb force. (b) Treat the electron as a current loop. Calculate the resulting torque when the electron-alpha syste
A filter has the following design specifications: Cutoff frequency 1500 Hz Second-order Butterworth highpass filterSallen-Key circuit topology Determine the transfer function and realize it using the
Determine the transfer function of the second-order (2 poles) lowpass Butterworth filter with a 3-dB cutoff frequency of 5 kHz. Design it using the Sallen-Key lowpass filter configuration, find all th
One of the home satellite services uses a dish antenna having a diameter of 18" (0.457 m) and frequency of 12.45 GHz. If the illumination efficiency is 70%, determine the gain of the antenna in dB
Assume that an antenna has a power input of 50 W and a gain of 30 dB relative to an isotropic radiator. Determine the increase in dB of the received signal at a point where the signal strength is 5
The input impedance of a certain antenna is 30+ j40 ohms and the rms voltage across the terminal is 100 V. If the antenna were 100 percent efficient, determine the total radiated power in watts.
A coaxial cable contains material with a dielectric of 9. The diameter of the inner conductor is 2 mm and the diameter of the outer conductor is 12 mm. Determine the velocity of propagation in m/s.
A coaxial cable contains material with a dielectric constant of 9. The diameter of the inner conductor is 2 mm and the diameter of the outer conductor is 12 mm. Determine the characteristic impedanc
The power density 50km from a transmitting antenna is 0.5 uW/m^2. If the frequency is 2 GHz and the antenna gain is 30 dB, determine the transmitter power.
A well-behaved analog signal with a frequency of 20 kHz is being sampled. What is the sampling frequency of frequency aliasing occurs