A dipole antenna of carries
peak current at
frequency. Calculate the radiation intensity in the side-on direction at a distance of
.
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In mobile telephony explain in detail the functions of base station and mobile switching centre.
State with reasons whether the following statements are True or False.
i) Rise time of a pulse is the time required for the amplitude to reach from 0% to 100% of the peak amplitude value.
ii) Standing wave ratio of a matched transmission line is zero.
iii) Amplitude modulation index for dc modulating signal is 100%.
iv) Multipoint communication system in telephony is more efficient than point-to-point communication.
v) Though audio frequency range is 20 Hz to 20 kHz, the telephone uses only 4 kHz bandwidth per channel, still the communication is audible.
vi) In superheterodyne receiver the local oscillator always operates at a fixed frequency.
vii) Bandwidth of video amplifier of the monochrome receiver is narrower than that in the case of colour video amplifier.
viii) Polarization discrimination technique doubles the bandwidth of the channel.
ix) Token ring protocol suffers with the data collision problem.
x) The compact structure of OSI model makes data transfer efficient as compared to TCP/IP model.
लम्बे ऐन्टेना में
आवृत्ति पर
की शिखर धारा प्रवाहित होती है।
दूरी पर पार्श्व दिशा में विकिरण तीव्रता परिकलित करें।
उचित चित्र की सहायता से क्रमिक अपवर्तनांक बहु-विधा तंतु की संरचना समझाएं । यह मॉडल परिक्षेपण को कैसे कम कर देता है ?
Describe the working of a CCD camera.
सिग्नल प्रेषण में अंकीय कोडन से विस्फोट त्रुटि का निराकरण कैसे किया जा सकता है ? अपने उत्तर की पुष्टि करें।
व्यवहार में किसी संचार तंत्र के लिये माध्यम का चयन किस प्रकार किया जाता है ? रेखीय माध्यम को वरीयता क्यों दी जाती है ?