Recent questions and answers in Analog Communications

Which option(s) represents/ represent the dielectric loss tangent of a substrate?Ratio of the real to imaginary parts of the total displacement current$\left(\omega \epsi...

Consider a real, narrowband signal $x(t)=A(t) \cos \left[2 \pi f_{c} t+\theta(t)\right]$ where the maximum frequency components of $A(t)$ and $\theta(t)$ are $f_{M}$ and ...

Consider a frequency-modulated (FM) signal$$f(t)=A_{c} \cos \left(2 \pi f_{c} t+3 \sin \left(2 \pi f_{1} t\right)+4 \sin \left(6 \pi f_{1} t\right)\right)$$where $A_{c}$ ...

Let a frequency modulated $\text{(FM)}$ signal$x(t)=A \cos \left(\omega_{c} t+k_{f} \int_{-\infty}^{t} m(\lambda) d \lambda\right)$, where $m(t)$ is a message signal of b...

A communication channel has first-order low pass transfer function. The channel is used to transmit pulses at a symbol rate greater than the half-power frequency of the l...

An amplifier A has $6 \; d \mathrm{B}$ gain and $50 \; \Omega$ input and output impedances. The noise figure of this amplifier as shown in the figure is $(a)$ is $3 \; d ...

A parabolic dish antenna has a conical beam $2^{\circ}$ wide, the directivity of the antenna is approximately$20 \; d \mathrm{B}$$30 \; d \mathrm{B}$$40 \; d \mathrm{B}$$...

The figure is shows the first stage of a superheterodyne receiver. The desired input signal is at a frequency of $700 \; \mathrm{MHz}$. The local oscillator $\text{(L.O)}...

The amplitude modulated wave form $s(t)=A_{c}\left[1+K_{a} m(t)\right] \cos \omega_{c} t$ is fed to an ideal envelope detector. The maximum magnitude of $\mathrm{K}_{0} m...

The frequency range for satellite communication is$1 \; \mathrm{kHz}$ to $100\; \mathrm{kHz}$$100 \; \mathrm{kHz}$ to $10 \; \mathrm{kHz}$$10 \; \mathrm{MHz}$ to $30 \; \...

A message $m(t)$ bandlimited to the frequency $f_{m}$ has a power of $P_{m}$. The power of the output signal in given figure is$\frac{\mathrm{P}_{m} \cos \theta}{2}$$\fra...

In an $\text{FM}$ system, a carrier of $100\; \mathrm{MHz}$ is modulated by a sinusoidal signal of $5 \; \mathrm{kHz}$. The bandwidth by Carson's approximation is $1 \; \...

The input to a channel is a bandpass signal. It is obtained by linearly modulating a sinusoidal carrier with a single-tone signal. The output of the channel due to this i...

A modulated signal is given by,\[s(t)=m_{1}(t) \cos \left(2 \pi f_{c} t\right)+m_{2}(t) \sin \left(2 \pi f_{c} t\right)\]where the baseband signal $m_{1}(t)$ and $m_{2}(t...

The input to a matched filter is given by$s(t) = \left\{\begin{matrix} 10\\ 0 \end{matrix}\right. \begin{array}{ll} \sin \left(2 \pi \times 10^{6} t\right) & 0<1<10^{-4} ...

A baseband signal $\mathrm{m}(\mathrm{t})$ modulates a carrier to produce the angle modulated signal, $\text{Ac} \cos \left[2 \pi \times 10^{8} t+k_{p} \; m(t)\right]$, w...

A baseband signal $\text{g}(t)$ bandlimited to $100 \mathrm{~Hz}$ modulates a carrier of frequency $f_{0} \mathrm{~Hz}$. The modulated signal $\text{g}(t) \cos 2 \pi f t$...

A $1 \; \mathrm{MHz}$ sinusoidal carrier is amplitude modulated by a symmetrical square wave of period $100 \; \mu \mathrm{sec}$. Which of the following frequencies will ...

The line-of-sight communication requires the transmit and receive antennas to face each other. If the transmit antenna is vertically polarized, for best reception the rec...

An angle-modulated signal is given by $s(t)=\cos 2 \pi\left(2 \times 10^{6} t+30 \sin 150 t+40 \cos 150 t\right)$.The maximum frequency and phase deviations of $s(t)$ are...

A person with a receiver is $5 \; \mathrm{Km}$ away from the transmitter. What is the distance that this person must move further to detect a $3-d B$ decrease in signal s...

A DSBSC modulated signal $s(t)=10 \cos \left(2 \pi \times 10^{b} t\right. +\phi) m\left(t^{-}\right)$is corrupted by an additive white Gaussian noise of power spectral de...

The image channel selectivity of superheterodyne receiver depends upon$\text{IF}$ amplifiers only$\text{RF}$ and $\text{IF}$ amplifiers onlyPreselector, $\text{RF}$ and $...

A $\text{DSB-SC}$ signal is generated using the carrier $\cos \left(\omega_{c}, t+\theta\right)$ and modulating signal $x(t)$. The envelope of the $\text{DSB-SC}$ signal ...