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If the magnitude of the spectrum increases to +6 dBm at 0 Hz, what is the increase in the voltage of the rectangular pulses?
Write down the equation for the occupied bandwidth of a digital band pass (radio) link that has ideal RRC filters with alpha = 0.4 and a symbol rate Rs sps.
A 1 volt peak sine wave signal at a frequency of 5 kHz is applied to the modulation terminal of the FM transmitter.
DSB-SC signals cannot be demodulated with an envelope detector. Describe one way in which a DSB-SC signal can be demodulated.
If the narrower RF channel of 20 kHz were used as in part (d) above, how would the performance of the audio signal at the receiver be changed?
Determine the distance to an earth fault on one of the cores of a uniform three-core underground cable. Ra = 2 ohms, Rb = 1 ohm and the cable length is 300 m.
The base-region is sufficiently thin (WB << LN, where LN is the electron diffusion length) as to allow us to assume a linear minority gradient dnB(x)/dx.
In comparing the behaviour of an n-channel MOSFET with a p-channel device having identical geometry and threshold voltage.
The signal from the radio's antenna is first amplified in an RF amplifier and then multiplied by a local oscillator signal.
There is a strong signal at the image frequency you found in part (b) above. The image signal is 40 dB stronger than the wanted signal.
There are 100 video channels numbered 1 through 100. Is this system using FDM or FDMA?
Occasionally the hub has a voice message that is to be sent to all the mobile units. Can the message be sent on a single RF frequency?
Draw a fault tree for the top event "no flow out of the system."Find the minimal cutsets.
A DSSS-CDMA signal has a chip sequence that is 10,000 chips in length. The sequence repeats every millisecond. What is the chip rate?
A hard disk contains four Platters. Each side of the platter is coated with a magnetic oxide, allowing data to be stored on it.
A microwave radio link operates over a bandwidth of 400 MHz at C band. The link carries a number of channels of data using FDMA.
Figure shows the block diagram of a superhetrodyne radio receiver. In a test a 20 uV signal was fed from the aerial into the first stage of the receiver.
As a rule of thumb, the perceived noise from a source falls by 6 dBA with every doubling of the distance from the source.
A simplified model of ADC noise refers the noise to a noisy input source resistance Rn while assuming the rest of the signal path to be noiseless.
Assume that at t = 70, B revokes the access right from C. Using the conventions, show the resulting diagram of access right dependencies.
A continuous time signal x(t) has the Fourier transform X(?) = 1/(j?+b) where b is a constant. Determine the Fourier transform for v(t) = x(t) * x(t).
Explain the operation of the circuit and in particular the role of resistors R1 and R2.
Compute the unit-pulse response h[n] for the discrete-time system y[n+2]2y[n+1]+y[n]=x[n] (for n = 0, 1, 2, 3).
A 415 V, 3-phase generator supplying a 3-phase 415/110 V transformer. Draw the individual and combined impedance diagrams to a base of 10 kVA.
See the drawing showing proportional plus derivative controller that has a proportional band of 20% and a derivative action time of 0.1 minutes.