Noise in dsb sc receivers amplifiers
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Low Noise Amplifier
Change in amplitude of the carrier according to modulating signal b. Change in frequency of the carrier according to modulating signal c. Change in amplitude of the modulating signal according to carrier signal d. Change in amplitude of the carrier according to modulating signal frequency. Sensitivity b. Selectivity c. Stability d. None of the above. Operates in class A mode b. Has a low efficiency c.
Output power is small d. All of the above. Have better sensitivity b. Have high selectivity c. Need extra circuitry for frequency conversion d. Carrier frequency b. Upper side band frequency c. Lower side band frequency d. Varactor diode b. High pass Filter c. Zener diode d.
Low pass filter. The minimum sampling frequency required for the signal so that the signal is ideally sampled is. To reduce the bandwidth of the signal to be transmitted b.
To combine multiple data streams over a single data channel c. To allow multiple data streams over multiple channels in a prescribed format d. To match the frequencies of the signal at the transmitter as well as the receiver. Sampling of signals less than at Nyquist rate b. Sampling of signals greater than at Nyquist rate c. Sampling of signals at Nyquist rate d. If the AM station is transmitting on a frequency of kHz, the values for maximum and minimum upper and lower sidebands and the total bandwidth occupied by the AM station are:.
If the modulation is percent, calculate:. Power of the signal P total transmitted by a transmitter after modulation is given by. The lower portion of the MF band to kilohertz is used for ground-wave transmission for reasonably long distances.
The upper and lower ends of the mf band are used for naval purpose. Calculate the power in the carrier and the sidebands. Less than 1 c. Greater than 1 d. Class A b. Class C c. Find the percentage of modulation when the antenna current increases to Addition of two signals b. Multiplication of two signals c. Rejection of noise d. Poor selectivity b. Poor Signal to noise ratio c.
Poor sensitivity d. Signal can be transmitted over very long distances b. Dissipates very small power c. Antenna height of the transmitter is reduced d. Higher bandwidth than SSB b. Both a and b d. Reducing noise while transmission b.
Multiplexing the signals c. Reduction of Antenna height d. Reduction in the complexity of circuitry e. In SSB-SC transmission, as the carrier and one of the sidebands are suppressed, the bandwidth remains as f m. Not predetermined.
Detection b. Recovering information from modulated signal c. Detection of modulating signal b. Removal of unwanted signal c. Difficult to recover information at the receiver b. Carrier has to be locally generated at receiver c. Both a and b are correct d. What is the percentage of modulation? Continuous signal with varying amplitude or phase b.
No numerical coding c. AM or FM signal d. Phase modulation b. Frequency modulation c. Amplitude modulation d. Extracting week signal from noise b. Need a reference signal with predetermined frequency and phase c. Sampling b. Amplitude modulation c. Filtering d. Data rate is low b. Less transmission bandwidth is required c. Synchronization is not needed d. Electromagnetic waves b. Water c. Wires d. Fiber optic cable. Envelope of the AM wave b. Carrier signal c. Amplitude of modulating signal d.
Above the carrier frequency b. Includes the carrier frequency c. That lies in AM spectrum d. Both a and c are correct. Below the carrier frequency b. None of the above e. Both a and b are correct. If a modulating frequency of 10 KHz modulates the oscillator, find the frequency range of the side bands. Modulation is done at lower power of carrier and modulating signal b. Output power is low c. Power amplifiers are required to boost the signal d. Modulation is done at high power of carrier and modulating signal b.
Figure of merit
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10 dB का शोर स्तर 1 dB के शोर स्तर से कितना गुना अधिक शक्तिशाली होता है?
Start Learning Hindi English. Start Now. Get Started for Free Download App. Gain and NF of a single-stage amplifier are 10 dB and 3 dB respectively. When two such amplifiers cascaded then gain and NF of the cascaded amplifier will be? Their equivalent noise temperature is. For overall noise figure of the cascaded system, the correct statement is:.
ECE - Krishna University
Transmitters that transfer AM signals are called AM transmitters. The AM transmitter receives the audio signal as input and transmits the amplitude-modulated wave to the antenna as output. The block diagram of the AM transmitter is shown in the following:. In the Audio Stage segment, an audio signal from the output for example, perhaps a microphone output, etc.
Analog Communication Test Questions - Set 5
The AGC gives a DC voltage as an output that is proportional to the amplitude of the received signal. In AGC, the output is a linear function of the input. ANSWER: All of the above Explanation: Sensitivity of a receiver is defined as the ability of the receiver to amplify weak signals received by the receiver. It is the voltage that must be applied at the input terminals of the receiver to achieve a minimum standard output at the output of the receiver. The factors that determine the sensitivity of super heterodyne receiver are - - Gain of the IF amplifier - Noise figure of the receiver - Gain of RF amplifier. It rejects the other signals at closely lying frequencies.
ANALOG COMMUNICATION
In any communication system, during the transmission of the signal or while receiving the signal, some unwanted signal gets introduced into the communication, making it unpleasant for the receiver, and questioning the quality of the communication. Such a disturbance is called as Noise. Noise is an unwanted signal , which interferes with the original message signal and corrupts the parameters of the message signal. This alteration in the communication process, leads to the message getting altered. It most likely enters at the channel or the receiver. Hence, it is understood that the noise is some signal which has no pattern and no constant frequency or amplitude. It is quite random and unpredictable.
ACL-FIL Filters Noise and Audio Amplifier Kit
These kits are provided with extensive test points allowing students to investigate the various aspects of system operation. Each kit is equipped with correlated courseware to guide students through the application and demonstration of communication techniques and concepts. An interactive user-friendly e-manual software is provided optionally with this training lab on CD. Alternatively facility is also provided for connecting an external audio-frequency signal as modulating input signal.
Report Download. The receiver consists only of an ideal lowpass filter with the bandwidth W. The noise power at the output of the receiver for a white noise input:. The transmitter power is one kilowatt and the channel attenuation is The received signal at the output of the receiver noise-limiting filter is the sum of this signal and filtered noise.
Embed Size px x x x x The receiver consists only of an ideal lowpass filter with the bandwidth W. The noise power at the output of the receiver for a white noise input:. The transmitter power is one kilowatt and the channel attenuation is The received signal at the output of the receiver noise-limiting filter is the sum of this signal and filtered noise.
Skip to search form Skip to main content You are currently offline. Some features of the site may not work correctly. DOI: The laser linewidth requirement for an optically amplified system becomes relaxed in comparison with the system with no optical amplifier, owing to the fact that the effect of incomplete phase tracking becomes less important as a larger signal power is demanded to maintain a fixed bit-error rate.
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