De-emphasis circuit is used? Mark as favorite Copy Link After modulation After detection Before modulation Before detection Check Answer
In a super heterodyne receiver, rejection of the image signal can be achieved by using a? Mark as favorite Copy Link Higher local oscillator frequency Crystal oscillator Narrow band pass filter Narrow band pass filter at RF stage Check Answer
Identify the modulation schemes for the shown signal constellation diagrams? Mark as favorite Copy Link A-QPSK B-BPSK C-QAM A-OPSK B-OQPSK C-MSK A-OQPSK B-QAM C-QPSK A-OQPSK B-QPSK C-MSK Check Answer
In communication systems, noise is most likely to effect the signal? Mark as favorite Copy Link In the transmitter In the information source In the channel At the destinations Check Answer
Time gap between two byte in a synchronous transmission is? Mark as favorite Copy Link Fixed Zero Differentiation of data rate variable Check Answer
When signal frequency is 2000 KHz and IF is 455 KHz, the image frequency could be? Mark as favorite Copy Link 2910 KHz 1645 KHz 2455 KHz 2090 KHz Check Answer
In a radio transmitter, the frequency of the crystal oscillator will be stable for a long time if the quality factor of the crystal resonator is? Mark as favorite Copy Link > 100 > 500 >1000 > 20000 Check Answer
In an IF amplifier, the IF transformer is provided with tapping to? Mark as favorite Copy Link Increase the voltage gain Increase the bandwidth of the resonance circuit Increase the impedance offered by the resonance circuit to the following cascaded amplifier Increase the quality factor of the resonance circuit Check Answer
Standard AM broadcast stations usually use what type of transmitting antennas? Mark as favorite Copy Link Log periodic Driven collinear array Marconi array Yagi - Uda Check Answer