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Q3) (a) If the SNR of a wireless link is 18dB and the RF bandwidth is 30kHz, using Shannon's capacity formula, determine the maximum theoretical data rate that can be transmitted. (5 marks) Electro Magnetic Interference (EMI) is normally considered either conductive or radiative. For each type of interference describe at least three ways of reducing their effects. (2 x 3 marks) (b) (c) (d) If the height of an antenna is 100 metres calculate the difference in metres between the radio and optical horizons (presume an adjustment factor of 4/3). (4 marks) If a correctly terminated line has a characteristic impedance of 509 and a measured velocity of propagation of 2.2 x 108 m/s with an attenuation of 4dB/km. If a fault develops, and the reflected pulses are returned non-inverted after 10us with a magnitude 0.05 of that of the transmitted pulse. Calculate the resistance and position of the fault. (10 Marks)
Paragraph Sures Styles 15 Editing Adobe Acrobat Voice Sensitivity Fease les Q2) (a) (b) A Wi-Fi access point operating at 5GHz, receives a -60 dBm signal at a distance of 50m. What was the transmitted power in Watts if you ignore antenna gain and any losses? (10 marks) Time Domain Reflectometry is a standard method employed to find faults on transmission lines. If a correctly terminated line has a characteristic impedance of 100 and a measured velocity of propagation of 2.2 x 10 m/s with an attenuation of 3dB/km. If a fault develops, and the reflected pulses are returned non-inverted after 10us with a magnitude 0.05 of that of the transmitted pulse. Calculate the resistance and position of the fault. (10 marks) fo) With the aid of diagrams, explain what happens when the load of a terminated transmission line increases and decreases in resistance. (5 Marks)