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A superheterodyning FM receiver was originally designed and built to operate in the US only. The FM broadcasting band in the US is from 87.5 MHz to 108 MHz. The intermediate frequency of the receiver is fI = 10.7 MHz. This receiver has a poor RF BPF. (a) Determine the frequency range and the tuning ratio of the receiver LO. Can any FM channel in the US be the image station of another FM channel? Explain in detail. (b) If this receiver is brought to another country whose FM band is between 79.5 MHz and 105.1 MHz, what range of desired channels, if any, in this new country are at risk of being interfered?
The turns ratio (n3/n1) is chosen such that the converter produces the required output voltage at a transformer duty cycle of D=0.4. For each case determine numerical values for the turns ratio n3/n1 and for the efficiency.
A 1(lambda) wavelength long line has parameter R=0.2 Ohm/m, G=0.002 mho/m, L=15 muH/m and C=2.31pF/m. The line is operated at a frequency f=2.5 GHz. It is terminated with a load impedance of 100 Ohms.
Find the imaginary part of e^ - (j pi)/2 Find the magnitude of e^ jtheta (for any real value of theta) Find the magnitude of Ae^( j theta) (for any real values of A and theta) Find the phase of -5j in radians
A portion of the wave will reflect from the load and propagate back down the line to arrive at the input once again. Find the power that returns to the input and express this as a loss in decibels when compared to the original 10W input.
noncausal, linear, and time-invariant. Determine the impulse response for the system and verify that an LTI system defined by the impulse response you determined satisfies the difference equation.
An intergrated circuit temperature probe is rated at 0-10 volts dc over a 0-175 degrees Celsius range. What is the temperture when the output voltage is 3.65 volts dc
A painter is standing on a work platform that is 27 feet above ground level. For fall protection, the worker's safety harness D-ring is attached to a 12-foot shock absorbing lanyard that is securely fastened to the structure at a point 40 feet abo..
Design an analog computer circuit to solve the following differential equation 1)Draw the state flow diagram 2)Design and draw the OpAmp circuit. Show the values for the resistors and capacitors. Label all inputs and outputs
The high-voltage windings are connected in Y with a solidly grounded neutral. Draw the per-unit zero-, positive-, and negative-sequence networks if the low-voltage wind- ings are connected: (a) in D with American standard phase shift
Find the appropriate subchannel modulation format (note: the number of constellation points in the modulation mapping scheme should be the power of two).
For use in a liquid crystal display, you want an electrode that is transparent to all visible light. You decide to use a doped semiconducting oxide with a mobility of 10^(-2) m^2/V-s. What is the maximum conductivity you can expect from your oxid..
A positron (same mass as electron) moving at .8c collides head on with a stationary electron producing two photons with EQUAL ANGLES relative to the incoming positron. Find the photon energies, wavelengths and angle
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